DOCUMENTATION FOR SWATH SHIP RESISTANCE AND PROPULSION PREOICTI--ETCIU) UNCLASSIFIED DTNSRDC/SPD-0927-02 U)lEllmllhmEEm EEEEEEIIIIIEI EEIIEEEEEEEIIE EEIIIIIIEEIIIE EEIIIEIIEEEEI IIIIIIIIIIIIIIlfflfflf
DOCUMENTATION FOR SWATH SHIP RESISTANCE AND PROPULSION PREOICTI--ETCIU)
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E- DAVID W. TAYLOR NAVAL SHIPC RESEARCH AND DEVELOPMENT CENTERCf) ietheudl, Maryland 20084
DOCUMENTATION FOR SWATH SHIP
0z RESISTANCE AND PROPULSION PREDICTION PROGPAMS0
0(CLOSEFIT AND SYNTHESIS):o
-- MAINTENANCE MANUAL
.,
w" Arthur M. ReedC.-
z0
0 Approved for Public Release: Distribution Unlimiteda.i DTICP U IV JUNO 11981
Ship Performance Departmentr z
0>-U.C)
z-.]. LI..
S APRIL 1981 DTNSRDC/SPD-0927-02
mPD ThSNC 58213 (240) B ~ (1 I "IM.Fo,6 l In
---- Sl L
MAJOR DTNSRDC ORGANIZATIONAL COMPONENTS
DTNSROC
COMMANDER
TECHNICAL DIRECTOR01
OFFICER-IN-CHARGE OFFICE R.I N-CHARGECARDE ROCK ANNAPOLIS05 04
SYSTEMSDEVELOPMENTDEPARTMENT
11
AVIATION ANDSHIP PERFORMANCE SURFACE EFFECTS
DEPARTMENT DEA RTMETSDEPARTMENT
15 16
STRUCTURES 1COMPUTATION,DERTMENT MATHEMATICS AND
DEPARMENTLOGISTICS DEPARTMENT17 18
PROPULSION ANDSHPACOUSTC AUXILIARY SYSTEMSDEPARTMENT DEPARTMENT
19 27
SHIP MATERIALS CENTRALENGINEERING INSTRUMENTATIONDEPARTMENT DEPARTMENT
28 29
NI . tII H M m | ' i~
UNCLASSIFIEDYCAIFICATINO HSPG *ee ieEtrd
READ INSTRUCTIONS
12. GOVT ACCESSION NO. S. RECIPIENT'S CATALOG MUMMER
- -4be-of - -TYP OF REPORT 4 PERIOD COVERED%
SNHS5 ):MAINTENA E MANUA.- N~a~~44-TR UMBER
C 7. AUTOR~a) S. C~o TRACT OR GRANT NUMDER()
L Arthur M.'/Reed /A(
9. PERFORMING ORGANIZATION NAME *.AES9 10. PRO? N E MINT PROJECT, TASKAREA
David W. Taylor Naval Ship Research and Develop- 62543N, ZF43 4T210~ 1ment Center, Bethesda, Maryland 20084 1-1500-103
I. CONTROLLING OFFICE NAME AND ADDRESS C -l," " "j APRA
14. MONITORING AGENCY NAME & AORESS(i1 differert from. Controllin Off11ce) I5. SECURITY CLASS. (of this report)
UNCLASSIFIED
IS&. DECL ASSI FICATION/ DOWNGRADING
F SCHEDULE
IS. DISTRItNI4'IT 4E T fof this Report)
* Approved for Public Release: Distribution Unlimited
17. DISTRIBUTION STATEMENT (of the abstract entered in Black 20, if different from. Report)
Is. SUPPLEMENTARY NOTES
IS. KCEY WORDS (Continue on reverse side if necessary and Idetilfy by block number)
Small-Waterplane-Area Twin-Hull (SWATH) ships, resistance and propulsionprediction
ABSTRACT (Continue on reverse side It necessary and Identify by block number)This report documents two computer programs which determine the wave resistanceand propulsive performance of Small-Waterplane-Area Twin-Hull (SWATH) ships.These programs are SYNTHESIS and CLOSEFIT, and they use as input data themoments and offsets of ship geometry, respectively. While they both employlinearized ship wave theory and thin-ship approximation and share many sub-routines, CLOSEFIT is a more refined program capable of furnishing superiorresults. on the other hand, SYNTHESIS is simpler and includes severaladditional subroutines which cart determine the characteristics and performance
DDIFON 1473 EDITION OF I NOV 65 IS OSSOLETE AUNCLASSIFIEDSECURITY CLASSIFICATION OF THIS PAGE (111hen Date EnteredJ)
N, UNCLASSIFIEDt.u~iTv~ CLASSIFICATION OF THI1S PAOE(Whu, D016 Unte00
of a SWATH ship's propulsive system at both design and off-design conditions.
ii UNCLASSIFIEDSECURITY CLASSIFICATION OF THIS PAGt(Whsfl Dala EnterOW)
TABLE OF CONTENTSPage
LIST OF FIGURES .. ................. ......... iv
NOMENCLATURE .... ........................... v
ABSTRACT. ................................
ADMINISTRATIVE INFORMATION .. ......................
BACKGROUND .. ............................. 2
OVERVIEW OF CLOSEFIT .. .. ....................... 7
OVERVIEW OF SYNTHESIS .. ................. ...... 13
PROGRAM DOCUMENTATION OF CLOSEFIT .. ................. 15
COMMON BLOCK DEFINITIONS FOR CLOSEFIT. .. ............ 16
SUBROUTINE DOCUMENTATION FOR CLOSEFIT. .. ............ 27
4PROGRAM DOCUMENTATION OF SYNTHESIS. ................. 61
0COMMON BLOCK DEFINITIONS FOR SYNTHESIS .. ............ 63
SUBROUTINE DOCU1MENTATION FOR SYNTHESIS .. ............ 79
REFERENCES. .. ............... ............ 117
APPENDICES. .. ............... ............ 118
PROGRAM LISTING OF CLOSEFIT .. .. ................ 119
PROGRAM LISTING OF SYNTHESIS. .. ............... 171
LIST OF FIGURESPage
1 -Profile of SWATH Ship with Single Strut. ..... ........ 4
2 - Profile of SWATH Ship with Tandem Struts ..... ........ 5
3 -Tree Diagra of CLOSEFTSWATH Program .. ............ 8
4 - Tree Diagram of SYNTHESIS SWATH Program .. ............ 14
Accesslion For
1Tils GRA&IDTIC TAB
Justif i.cqe ion
Avai~leb.ty Cods
4tli andi/orsp"I al
iv
ii. NOMENCLAJLPAE
Symbol Description
A(x) Body sectional area functlon
A Maximum section area of body0
AhBm Symmetric coefficients of Chebychev sineseries for body
A Sm Symmetric coefficients of Chebychev sine
series for strut
AW Area of the waterplane
b Half of the separation distance of the hulls
BBm Anti-qmmetric coefficients of Chebychev
series for body
B Sm Anti-symmetric coefficients of chebychevsine series for strut
CA Correlation Allowance
CF Frictional resistance coefficient
CFm Form drag coefficient
Cp PBody Prismatic coefficient
C Wp Waterplane coefficient
CI1W Waterplane inertia coefficient
g Acceleration due to gravity
hB Maximum depth of submergence of axis of body
h S Maximum draft of strut
J (a) Bessel functions
LB Maximum length of body
Ls Maximum length of strut
PE Effective power
EV
NOMENCLATURE (CONT
Symbol Description
Rn Reynolds number
R Total ship resistance
% Wave resistance due to one main body
RF Frictional resistance
RFm Eddy resistance
RWS Wave resistance due to one strut
PWS Wave resistance due to the interaction
B of strut and main body
Rw Wave resistance
S Wetted surface
T Thickness of mid length of strut
t(x) Strut half thickness function
T mn Auxilalary function used in calculation ofB
RB
T (Tmax also used) Thickness of mid length of strut
T Auxiliary wave resistance function usedSBmn In calcuation of RSB
T Smn Auxiliary wave resistance function usedin calculation of RS
Um(x) Cheby chev cosine series
V Velocity of ship
Vm(x) Chebychev sin series
W Enn Auxiliary wave resistance function used incalculation of RB
VSmn Auxiliary wave resistance used Incalculation of RS
vi
NONMENCLATURE (CONT)
Symbol Description
W Auxiliary wave resistance function used inSBn calculation of RSB
Variable of Integration
Density of water
-YOB Dimensionlessnumber related to body length
and ship speed, used to remove singularities
YOS Dimensionlessnumber related to strut length
and ship speeds used to remove singularities
Variable of integration.
ENGLISH/SI EQUIVALENTS
I degree (angle) = 0.01745 rad (radians)
I foot = 0.3048 m (meters)
I foot per second (fps) = 0.3048 m/sec (meters per second)
I Inch = 25.40 mm(millimeters)
I knot = 0.5144 m/s (meters per second)
I lb (force) = 4.448 N (Newtons)
I lb (force - Inch Ibs) = 0.1130 Nim (Newton-meter)
I long ton (2240 pounds) = 1.016 metric tons; or 1016 kilograms
I power = 0.746 kW (kilowatts)
V' vii
ABSTRACT
This report documents two computer programs which determine thewave resistance and propulsive performance of Small-Waterplane-AreaTwin-Hull (SWATH) ships. These programs are SYNTHESIS and CLOSEFIT,and they use as input data the moments and offsets of ship geometry,respectively. While they both employ linearized ship wave theory andthin-ship approximation and share many subroutines, CLOSEFIT is a morerefined program capable of furnishing superior results. On the otherhand, SYNTHESIS is simpler and includes several additional subroutineswhich can determine the characteristics and performance of a SWATHship's propulsive system at both design and off-design conditions.
ADMINISTRATIVE INFORMATION
This investigation was authorized under a direct funded block from the Naval
Material Command (NAVMAT 08T23) under Program Element 62543N, Task Area ZF43-421-
001, and funded through the High Performance Vehicles Office of the David W. Taylor
Naval Ship Research and Development Center (DTNSRDC), Work Unit 1-1500-103.
.... ... . " . ... J |||1 ........ [
BACKGROUND
This report (Maintenance Manual) contains documentation for two
computer programs, CLOSEFIT and SYNTHESIS, which have been developed at
the David W. Taylor Naval Ship R&D Center (DTNSRDC) to predict the
effective and delivered power for Small-Waterplane-Area Twin-Hull (SWATH)
ships. This maintenance manual contains documentation for each subroutine
in the programs, definitions of all of the variables in the COMMON BLOCKS,
and a listing of the computer programs. This documentation is intended
for the individual who must modify the computer programs, and must
therefore be able to understand the functioning of the programs, and
should be contrasted with the Users Manual, which serves to define the
input to and output from the programs. The ability to prepare proper
input, and to use the output does not require an understanding of the
workings of the program.
SWATH ships are catamarans which combine a thin strut with a submerged
elongated slender body. Each demi-hull of the SWATH has either one
(single) or two (tandem) struts which support the lower hull. Figures 1
and 2 show schematic diagrams illustrating the geometry of single and
t-...em strut SWATH configurations, respectively.
Programs CLOSEFIT and SYNTHESIS have a similar theoretical foundation
in that they are both based on linearized ship wave theory and the thin
ship approximation in the framework of the potential flow of an incompressible,
inviscid fluid. In general, thin-ship theory can be applied to any
conventional catamaran with arbitrary camber. However, as this theory
has been specialized to SWATH configurations, the ship geometry is
2
restricted to ships with "no-cross flow" cambers. In practice, this
means SWATHS with very small strut thicknesses compared to the transverse
strut separation.
In the theory of ship resistance extrapolation, the resistance of a
ship is typically decomposed into residuary and frictional resistance
components. The frictional resistance component is generally taken as
equal to the resistance of a flat plate with area of the ship, and with
length equal to the length of the ship. The three dimensional viscous
effects are then included in the residuary resistance along with other
resistance components such as wave making resistance. For a SWATH ship,
the calculation of the frictional resistance is not as simple as stated
above, however, the same principle applies if one calculated the
frictional resistance of the bodies and struts separately.
The wave making resistance component of the residuary resistance can
be computed using inviscid fluid flow theory. However, the other
components of the residuary resistance are not easily calculated
theoretically. Because of this, the remainder of the residuary resistance
is computed empirically. The difference between the experimentally
determined residuary resistance and the theoretically determined wave
resistance is calculated for those cases where adequate experimental data
exists. These differences which are denoted as "form drag", are then
plotted as a function of strut speed-length ratio. Under the assumption
that the form drag remains unchanged f or reasonable changes of SWATH
proportions, a curve can be f aired through the individual form drag curves,
and applied to new hull forms.
Ad
3
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4 -J
440
x-4
co 0
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c 6 4-)
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u
4.0 42c5
For the wave resistance predictions, the geometries of the body and
strut(s) are represented by modified Chebychev series. The methods used
to determine these series are the principal differences between the
programs CLOSEFIT and SYNTHESIS. The program CLOSEFIT uses an integration
technique, similar to that used to determine the coefficients of a Fourier
series, to determine the coefficients of the Chebychev series based on
the actual hull offsets. The program SNYTHESIS uses statical moments of
the strut waterplane and body to define the coefficients of the Chebychev
series. Typically, the CLOSEFIT program uses a series of 10 to 20 pairs
of terms to represent a body or strut, where each pair of terms contains
an even and an odd Chebychev function, in the same fashion that a Fourier
series consists of pairs of sine and cosine functions. The program
SYNTHESIS uses a series consisting of only three pairs of terms to
represent the body and strut. This reduction in the number of terms
results in savings of ten to forty times in the computation of the wave
resistance in SYNTHESIS as compared to CLOSEFIT.
In addition to the effective power computations, the program SYNTHESIS
also computes the delivered power which would be required to propel the
SWATH ship. The propulsion calculations are performed by a subprogram
SHPCMP and its attendant subprograms. SHPCMP determines the wake and
thrust deduction for the doeign based on empirical relations derived from
earlier SWATH propulsion experiments. The program then calculated the
optimum four bladed Troost series propeller at the design speed, along
with the off design performance of the propeller. This data along with
the effective power computations is used to calculate the delivered power.
6
OVERVIEW OF CLOSEFIT
The CLOSEFIT SWATH program is composed of several modules, each of
which consists of a number of subroutines and performs a specific func-
tion in the SWATH ship resistance calculation. Figure 1 presents a tree
diagram which reflects the relationship among all subroutines.
Subroutine CHEB evaluates the coefficients of the Chebychev series,
which represents the strut half thickness function and the body
sectional area function in wave resistance equations. This is
accomplished by calling READ, SCALE, COMPUT, CHECK and SURFACE. The
offset tables are read in by Subroutine READ, then normalized by
Subroutine SCALE. The driver Subroutine COMPUT calls Subroutine CHEV,
which in turn calls SPLINE and SUMSPL to compute the coefficients of
the Chebychev series. The integrals used to evaluate the strut
Chebychev coefficients are as follows:
Asm - - 1/2 t(sin 0) cos(2m-l)6d6
B n -n/2sm - -- T/2 t(sin 0) sin 2mOdO
where t(sin 0) is a function adopted to describe the offsets of the
strut or the body. The Cubic Spline Function Technique is used to fit an
analytic curve to the discrete offset points. Subroutine SPLINE solves
7
READ
_ SCALE SPLINE
CHEB - COMPUT - CHEV SU?4SPL,
- CHECK EVAL
L SURFACE WTSURFS - EVAL
WTSURFB - EVAL
-ECHO
_PLOTI
_PLOT 2
-PCHEB - PLOT3
_ PLOT4 - QPLOTZ5
-RINIT
-SIMPS-N
-RWAVE RINTEG - BESSJ
-BESSJ
SWATH- RE1FLKT
SUM
-RWOUT - FORMDR YINTP
CF ITTC
Figure 3 -Tree Diagram of CLOSEFIT SWATH Program
8
the set of simultaneous linear algebraic equations, which results from
the spline fitting procedure and obtains the second derivatives of the
analytical functions t(sin 0) at each offset point. Next, Subroutine
SUMSPL uses these second derivatives in a set of integration formulas
based on the Filon Quadrature Technique to evaluate the above trigono-
metric integrals. Subroutine CHECK evaluates the offsets approximated
from the Chebychev series in Subroutine COMPUT and prints out the
predicted offsets along with the true offsets. This permits a check on
the accuracy of the Chebychev series approximations.
Subroutine SURFACE computes the total SWATH ship wetted surface by
calling WTSURFS and WTSURFB. Subroutine ECHO echoes the input data of
the SWATH program on the printer as a check of its accuracy. Subroutine
PCHEB plots the strut half thickness curve and body sectional area
curve on the printer in order to validate the Chebychev series
approximation.
A large amount of the execution time of this program is spent in
the evaluation of the auxiliary functions, T and W, given by:
12 )2 =f d ) D ': h .o
(2n 1)(2n 1) qIW j 1
j~ f 2 2 2
2 J2 . I (0J4. I (aI J, I2,. ()J'n (a)
2m -1)(2n 1) 1 2 2b 7)[_ __ osD
(2m)( 2n)
12 ~ irn (PIJ2 1 )
9
(TSmn(2m -)I( 2n ) d l s D 2
X E SW ) )E j2m (a)j2n )
Due to the highly oscillatory nature of the integrands of these
auxiliary functions, the integration range is divided into three separate
intervals. For each interval, a particular numerical integration method
is used to improve the accuracy of the calculation. To avoid the
singularity in the denominator of the integrand, the integration variable
(ci) is replaced by Z = ci - osin the interval from yos to os+ 1.
The numerical method used in this interval is Simpson's Rule, which
uses 30 points. The central region of the integration process goes
from ci = Yo 1 to ci = max. The choice of %max is based on the require-
ment for accuracy in the numerical integration method used in this region,
where a step size is computed at a given a, and a three-point Simpson's
Rule is used until the upper integration limit of the region, cimax, is
reached.
An analytical integration formula was developed to determine the
effects of the final region, from a = cmax to a = ismax , where a is an
empirical constant which defines the upper limit of the tail region.
Beyond this point, the integration area is assumed to be negligible.
Subroutine PRINT will print the table of the T and W arrays,
provided the flag JTEST is set other than zero.
Subroutine RWOT calls SUM to evaluate the components of the wave
10
resistance, based on Lin and Day's equationsI . Form drag is evaluated
by Subroutine FORMDR, which is based on experimental data. Frictional
drag is estimated by calling Subroutine CFITTC, which is based on the CF
2curve adopted by the International. Towing Tank Conference (ITTC)
For each test speed, a table is printed showing all the components of
total ship resistance and the effective power required to tow the SWATH
ship at a constant speed.
'References are listed on page 112.
! 11
OVERVIEW OF SYNTHESIS
The procedure of the SYNTHESIS SWATH program parallels the CLOSEFIT
program in calculating total ship resistance, except in its approach to
obtaining the coefficients of the Chebychev series. In SYNTHESIS, the
waterplane area coefficients, waterplane moment, waterplane inertia,
body prismatic and body moment are used to evaluate the Chebychev
coefficients. The only other major difference between the two
programs is that SYNTHESIS includes a propeller design and optimization
program.
Figure 2 presents the tree diagram of all subroutines called by the
SYNTHESIS program. The module r4EB is much simpler in SYNTHESIS than
its CLOSEFIT counterpart due to its approach in evaluating the Chebychev
coefficients through geometvic identities as opposed to numerical integrations.
Modules RWAVE and ROUT ave identical for both programs, and in both
require a great deal of execution time.
Module FINDRG evaluates the fin drag of a SWATH ship. It is
directly excerpted from coding documented in reference (3).
Module SHPCMP can determine propeller design and off-design
performance if the propeller diameter is specified. The subroutines
used in this module are excerpted from coding documented in reference (4).
13
1~-nnx
RIN
WSURFB EVAL
_WSURFS EVAL-CHEB
_PCHEB PLOTi
_PLOT 2
_PLOT3
PLOT4 QPLOTZS
-RINIT
_SIMPSN
-RWAVE RINTEG BESSJ
-BESSJ
_REF LKT
SWATH-
-SUMl
-ROUT FORM4D YINTP
_CF ITTC
FRICT
-FINDRG- FOILSC
PRODES TROOST CALC
LBURIL
-SHPC4P- PROPP ERROR
PROPER -POLCOF
I ROOT
FTGIIRF 4 -Tree Diagram of SYNTHESIS SWATH Program
14
PROGRAM DOCUMENTATION OF CLOSEFIT
15
COMMON BLOCK DEFINITIONS FOR CLOSEFIT
16
COMMON/AUX/
PURPOSE: AUX stores the auxiliary function table.
NAME TYPE LENGTH DEFINITION
TS R (10,10) Auxiliary function T for strut
WS R (10,10) Auxiliary function W for strut
TB R (10,10) Auxiliary function T for body
WB R (10,10) Auxiliary function W for body
TSB R (10,10) Auxiliary function T for strut tobody
WSB R (10,10) Auxiliary function W for strut tobody
TS12 R (10,10) Auxiliary function T for strut 1
to strut 2
WS12 R (8,10,10) Auxiliary function W for strut ito strut 2
TB12 R (8,10,10) Auxiliary function T for body 1 tobody 2
WB12 R (8,10,10) Auxiliary function W for body 1 tobody 2
TSB12 R (8,10,10) Auxiliary function T for strut 1 tobody 2
WSB12 R (8,10,10) Auxiliary function W for strut 1 tobody 2
TSBP R (10,10) Auxiliary function T
WSBP R (10,10) Auxiliary function W
TSB12P R (10,10) Auxiliary function T
WSB12P R (10,10) Auxiliary function W
17
COMMON/NAME/
PURPOSE: NAME stores a flag indicating whether the offset data arefor the strut or the body and providing the alphanumericinformation for the strut and the body.
NAME TYPE LENGTH DEFINITION
INCHAR I 8 INCHAR (1) = STRUT. Strut offsetdata will follow.
INCHAR (1) = BODY. Body offset datawill follow.
INCHAR (2) to INCHAR (8). Hold thealphanumeric information for the strutor the body.
NAME I 7 Temporary storage location for alpha-numeric strut or body information.
18 4
COMMtON/NORM/
PURPOSE: NORM stores the scaling factors for normalizing X and Y.
NAME TYPE LENGTH DEFINITION
YMAX R Maximum value of Y
XDIVER R Divisor for normalizing X
YDIVER R Divisor for normalizing Y
XADDER R Number to be added to normalize X
19
COMMON/OMEGA/
PURPOSE: OMEGA stores the variables used in evaluating the auxiliary function.
NAME TYPE LENGTH DEFINITION
NMAX I Maximum order of Chebychev Series
HSOLS R Ratio of draft of strut to lengthof strut (h /L )
HBOLB R Ratio of depth of submergence tolength of body (hb/Lb)
GAMAOS R Yos = g
R Yob , g Lb/v 2GAMAOB RYo -'19L/2
NOSEPS I Number of different hull separationdistances
SEPDIS R (8) Hull separation distance b (ft)
SEP R (8) 2b/(y os*LS)
CSTRUT R (8) Distance of CL of strut to CL of body
CSTRT2 R (8) Distance of CL of 2nd strut (if present)from CL of body2
GOSQ R Y os
hPHIS R 2(b/ss
hbPHIB R 2(7bb)/Yo
RATIOL R Yob/Yos
20
COMMON/OUT/
PURPOSE: OUT defines and stores physical constants and geometricparameters.
NAME TYPE LENGTH DEFINITION SETVALUES
HS R Draft of strut h (ft)s
HB R Depth of submergence from surface tobody centerline hb (ft)
XLS R Length of strut Ls (ft)
XLB R Length of body Lb (ft)
TSMAX R Maximum thickness of strut t (ft)max
AX R Maximum cross-sectional area of body Ax (ft 2
PI R 3.1415926535897
G R Acceleration due to gravity g (ft/sec ) 32.155
RHO R Density of water p (lb x sec 2/ft ) 1.9367
GNU R kinematic viscosity v (ft 2/sec) 1.2970 x 105
WETS R Wetted surface area of strut S (ft )s
WETB R Wetted surface area of body Sb (ft )
WTSURF R Total wetted surface area St (ft )
VMFPS R Test velocity V (fps)
DELCF R Correction allowance ACF 0.0005
TITLE (8) Array of characters containing the titleof the test
21
COMMON/PLOT/
PURPOSE: PLOT stores the constants and characters for the plotting routine
SETNAME TYPE LENGTH DEFINITION VALUES
NFIRST I Position in the arrays of the first 1ordered pair to be plotted
NLAST I Position in the arrays of the lastordered pair to be plotted 101
NPOINT I NPOINT equals "" each point from 1NFIRST to NLAST is to be plotted, "2"if every other point is to be plotted,etc.
NMAX R Value of abscissa at right-most grid 1.0line
XMIN R Value of abscissa at left-most grid -1.0line
NSCLI L Logical value (Should be false if PLOTIhas not been called and standard grid isdesired)
NCHAR I Number of valid characters in label
NSCALE 1 (4) Printing scale factor of ordinate
PCHAR I (2) Plotting characters
22
COMON/PSI /
PURPOSE: PSI stores the parameters for the integration procedureSET
NAME TYPE LENGTH DEFINITION VALUES
NPTSZ I Number of integration steps from 31y to y+l (odd number)Os Os
PTSAF R Scaling factor of step size in 10.0integrating from qmax to aksmax
EXPN R Empirical constant for intergra- 7.0tion to stop
NALMAX I Maximum number of integration steps 300from y+l to a
OS max
NAL I Counter of integration steps
TAIL R Integration made from a to (Asmax
ALFA R Integrating variable (a)
ALMAX R Upper limit of a for integration
NSTEPS I Number of integration steps froma to amax o smax
23
COMONI PLTPF EG/DEIIIN-
PURPOSE: XRPLOTF stores the values of variables for the plotting routine
XL R Value of abscissa at left-most grid line
XHI R Value of abscissa at right-most grid line
YL Rt Value of ordinate at bottom grid line
YR R Value of ordinate at top grid line
KMOV R Abscissa index increment numberofor array GRAF
YMOV Rt Ordinate index increment number for array GRAF
24
COMMON/XRPLOTG/
PURPOSE: XEPLOTG stores the values and characters of variables for theplotting routein
NAME TYPE LENGTH DEFINITION
GR~AF 1 (11,204) Array containing the image to be plotted
25
COMMON/XRPLOTQ/
PURPOSE: XRPLOQ stores the constants and characters for the plotting routineSET
NAME TYPE LENGTH DEFINITION VALUES
II I Ordinate scale factor
JJ I Ordinate scale factor
KK I Ordinate scale factor
LL I Ordinate scale factor
NHL I Number of horizontal grid lines 6
NSBH I Number of spaces between adjacent 10horizontal grid lines
NVL I Number of vertical grid lines 11
NSBV I Number of spaces between adjacent 10vertical grid lines
NCHAR I Plotting character of horizontal grid IH.lines
VCHAR I Plotting character of vertical grid 1H.lines
IY I Number of vertical spaces
Ix I Number of horizontal spaces
V L Logical variable, - . TRUE . when themaximum and minimum values of the oridinateare determined
H L Logical variable, - . TRUE . when themaximum and minimum values of the abscissaare determined
26
SUBROUTINE DOCUMENTATION F~OR CLOSEFIT
27
NAME: PROGRAM SWATH
PURPOSE: Program SWATH is the main program for theCLOSEFIT resistance prediction of Small-Water-plane-Area Twin-Hull Ships
CALLING SERVICE: Program SWATH (INPUT, OUTPUT, TAPE5 - INPUTTAPE6 - OUTPUT, TAPE8)
ARGUMENTS: NONE
COMMON BLOCKS: OUT, AUX, O MEGA, PSI, COEFS
SUBROUTINES CALLED: CHEB, ECHO, PCHEB, PRINT, RWAVE, RWOUT
COMMENTS:
28
NAME: SUBROUTINE BESSJ
PURPOSE: SUBROUTINE BESSJ evaluates the Bessel functionfrom order 0 to order N.
CALLING SEQUENCE: CALL BESSJ (X, N, VJ)
ARGUMENTS: X Argument of the Bessel functionN Maximum order of the Bessel functionVJ Array holding (N+I) values of the Bessel4
function of order zero up to N, where
VJ(o) = Jo(X)
VJ(N) : JN(X)
COMMON BLOCKS: NONE
SUBROUTINE CALLED: NONE
CALLED BY: RINTEG, RWAVE
COMMENTS:
29
NAME: FUNCTION CFITTC
PURPOSE: Function CFITTC determines the ITTCfrictional resistance coefficientC
CALLING SEQUENCE: CF = CFITTC (RN)
ARGUMENT: RN Reynolds number R nat test condition
COMMO0N BLOCKS: NONE
SUBROUTINE CALLED: NONE
CALLED BY: RWOUT
COMMENTS: C .7
[1og10(Rn) -212
30
NAME: SUBROUTINE CHEB
PURPOSE: Subroutine CHEB computes from offset tablesthe coefficients of the Chebychev Series,which is an approximation of the outline ofthe waterplane area or body cross-sectional
area curve.
CALLING SEQUENCE: CALL CHEB (AMC, BMC, MMAX)
ARGUMENTS: AMC Coefficients of the ChebychevCosine Series
BMC Coefficients of the ChebychevSine Series
MMAX Maximum order of the ChebychevSeries
COMMON BLOCKS: NAVME, OFFSET
SUBROUTINES CALLED: READ, SCALE, COMPUT, CHECK, SURFACE
CALLED BY: SWATH
COMMENTS:
31
NAME: SUBROUTINE CHEB
PURPOSE: Subroutine CIEB computes from offset tablesthe coefficients of the Chebychev Series,which is an approximation of the outline ofthe waterplane area or body cross-sectionalarea curve.
CALLING SEQUENCE: CALL CHEB (AMC, BHC, NIAX)
ARGUMENTS: AIC Coefficients of the ChebychevCosine Series
B C Coefficients of the ChebychevSine Series
M AX Maximum order of the Chebychev
Series
CO,%1%ON BLOCKS: NAME, OFFSET
SUBROUTINES CALLED: READ, SCALE, COHPUT, CHECK, SURFACE
CALLED BY: SIVTH
COILMENTS:
32
NAME: SUBROUTINE CHECK
PURPOSE: Subroutine CHECK evaluates the Chebychev Seriesfrom the Cheby-hev coefficients obtained fromSubroutine COMPUT and prints out theevaluated offset table for manual checking.
CALLING SEQUENCE: CALL CHECK (AMC, BMC, MMAX, ISBODY)
ARGUMENTS: AMC Coefficients of the ChebychevCosine Series
BMC Coefficients of the ChebychevSine Series
MMAX Maximum order of the Chebychevpolynomial
ISBODY Logical flag, indicating "Is this
for body?"ISBODY =" jTRUE for body
t FALSE for strut
COMMON BLOCKS: OFFSET, NAME
SUBROUTINE CALLED: EVAL
CALLED BY: CHEB
CONMENTS:
33
NAME: SUBROUTINE CHEV
PURPOSE: Subroutine CHEV uses the offsets to computethe Chebychev coefficients via splineapproximation and numerical integration.
CALLING SEQUENCE: AMC Coefficients of the ChebychevCosine Series
BMC Coefficients of the ChebychevSine Series
MMAX Maximum order of the Chebychevpolynomial
ISBODY Logical flag, indicating "Is thisfor body?"
I. TRUE for bodyISBODY
FALSE for strut
COMMON BLOCKS: OFFSET, NAME
SUBROUTINES CALLED: SPLINE, FUNCTION SUMPSPL
CALLED BY: COMPUT
COMMENTS:
34
NAME: SUBROUTINE COMPUT
PURPOSE: Subroutine COMPUT initiates the computationof the Chebychev coefficients.
CALLING SEQUENCE: CALL COMPUT (AMC, BMC, MMAX, ISBODY)
ARGUMENTS: AMC Coefficients of the ChebychevCosine Series
BMC Coefficients of the ChebychevSine Series
MMAX Maximum order of the Chebychevpolynomials
ISBODY Logical flag, indicating "Is thisfor body?"
f. TRUE for bodyISBODY
* FALSE for strut
COMMON BLOCKS: OFFSET, NAME, NORM
SUBROUTINE CALLED: CHEV
CALLED BY: CHEB
COMMENTS:
35
NAME: SUBROUTINE ECHO
PURPOSE: Subroutine ECHO prints a summary of input data andthe Chebychev coefficients
CALLING SEQUENCE: CALL ECHO (NLOC)
ARGUMENT: NLOC Number of strut locations to betested
COMMON BLOCKS: AUX, OMEGA, OUT
SUBROUTINE CALLED: NONE
CALLED BY: SWATH
COM14ENTS:
36
NAME: SUBROUTINE EVAL
PURPOSE: Subroutine EVAL evaluates the Chebychev Seriesat a given station.
CALLING SEQUENCE: CALL EVAL (XX, MMAX, FFSET, AMC, BMC)
ARGUMENTS: XX Value of X station on a range of-1 to +1
MMAX Maximum order of the Chebychev
polynomial
FFSET Offset approximated by the ChebychevSeries
AMC Coefficients of the Chebychev CosineSeries
BMC Coefficients of the Chebychev SineSeries
COMMON BLOCKS: NONE
SUBROUTINE CALLED: NONE
CALLED BY: CHECK
COMMENTS:
37
NAME: FUNCTION FORMDR
PURPOSE: Function FORMDR evaluates the formdrag coefficient, based on experimental data
CALLING SEQUENCE: FOR = FORMDR (VL)
ARGUMENT: VL Ratio of ship speed to length ofstrut V//Tj
CO40N BLOCKS: NONE
SUBROUTINE CALLED: FUNCTION YINTP
CALLED BY: ROUT
COMMENTS: Form dra& is assumed to be 0.5 x 10 - 3
for V//LS less than 1.325 and greater than 2.5
1.0.9
L6L
U
0J
4C .4
0.5 1.0 1.5 w 30
38
NAME: SUBROUTINE PCHEB
PURPOSE: Subroutine PCHEB plots by line printer thebody sectional area curve and waterplaneoutline curve from the given Chebychevcoefficients
CALLING SEQUENCE: CALL PCHEB (AS, BS, AB, BB, NN, TITLE)
ARGUMENTS: AS Coefficients of Chebychev SineSeries for strut
BS Coefficients of Chebychev CosineSeries for strut
AB Coefficients of Chebychev SineSeries for body
BB Coefficient of Chebychev CosineSeries for body
NN Maximum order of Chebychev Series
TITLE Array containing the alphanumericcharacters of the title of the experi-ment
COMMON BLOCKS: PL(Y, XRPLOTQ
SUBROUTINES CALLED: PLOTI, PLOT2, PLOT3, PLOT4
CALLED BY: CHEB
COMMENTS:
39
NAME: SUBROUTINE PLOT1
PURPOSE: Subroutine PLOTI sets up spacing anddetermines the values of the axes.
CALLING SEQUENCE: CALL PLOT 1 (NSCALE, A, B, C, D, E, F)
ARGUMENTS: NSCALE Integer array defined asfollows:
NSCALE (1) - I, if printed values of theordinate are 10 ** I timesthe actual value
NSCALE (2) - J, if printed values of theordinate are 10 ** J timesthe actual value
NSCALE (3) - K, if printed values of theabscissa are 10 ** K timesthe actual values
NSCALE (4) - L, if printed values of theabscissa are 10 ** L timesthe actual value
A Integer number ofhorizontal grid lines
B Integer number of spacesbeyond each horizontal gridline to the next grid line
C Integer number of verticalgrid lines
D Integer number of spacesbeyond each vertical gridline to the next grid line
E Horizontal grid character
F Vertical grid character
COMMON BLOCK: XRPLOTQ
SUBROUTINE CALLED: NONE
CALLED BY PCHEB
COMMENTS:
40
NAME: SUBROUTINE PLOT2
PURPOSE: Subroutine PLOT2 examines the minimum andmaximum values of the abscissa and theordinate and establishes an internalformula for computing location in the imageregion corresponding to the point to beplotted.
CALLING SEQUENCE: CALL PLOT2 (XMAX, XMIN, YMAX, YMIN, NSCLI)
ARGUMENTS: XMAX Value of abscissa at right-mostgrid line
XMIN Value of abscissa at left-mostgrid line
YMAX Value of ordinate at top gridline
YMIN Value of ordinate at bottom gridline
NSCLI Logical flat (should be .FALSE.,
if PLOT1 has not been called andstandard grid is desired)
COMMON BLOCKS: XRPLOTF, SRPLOTQ, XRPLOTG
SUBROUTINE CALLED: NONE
CALLED BY: PCHEB
COMMENTS:
41
NAME: SUBROUTINE PLOT3
PURPOSE: Subroutine PLOT3 assigns an alpha-characterto each point to be plotted.
CALLING SEQUENCE: CALL PLOT3 (PCHAR, X, Y, SDATA, FDATA, DDATA)
ARGUMENTS: PCHAR Plotting characterX Array containing the X coordinates
to be plottedY Array containing the Y coordinates
to be plottedSDATA Integer position in the arrays of
the first ordered pair to be plottedI if each point from SDATA to DDATAis to be plotted
FDATA 2 if every other point is to beplotted3 if every third point is to beplotted
DDATA Integer position in the array of thelast ordered pair to be plotted
COMON BLOCKS: XRPLOTF, XRPLOTG
SUBROUTINE CALLED: NONE
CALLED BY: PCHEB
COWENTS:
42
NAME: SUBROUTINE PLOT4
PURPOSE: Subroutine PLOT4 prints the image of thecompleted graph on the printer, includingthe values of the abscissa and the ordinateat the grid lines outside the bottom andleft edge of the graph.
CALLING SEQUENCE: CALL PLOT4 (MCHAR, NCIHAR)
ARGUMENTS: MCHAR Single dimension array containingalpha-characters to be plotted atthe left of the graph
NCHAR Number of valid characters inMCHAR
COMMON BLOCKS: XRPLOTF, XRPLOTG, XRPLOTQ
SUBROUTINE CALLED: QPLOTZ5
CALLED BY: PCHEB
COMMENTS:
43
NAME: SUBROUTINE PRINT
PURPOSE: Subroutine PRINT prints the auxiliaryfunction tables of T and W.
CALLING SEQUENCE: CALL PRINT (I, NLOC2)
ARGUMENTS: I Index indicating strut locationNLOC2 Flag indicating the presence of
a second strutN0 if single strut
2 1 if tandem struts
COMMON BLOCKS: OUT, AUX, OMEGA
SUBROUTINE CALLED: NONE
CALLED BY: SWATH
COMMENTS:
44
NAME: SUBROUTINE QPLOTZ5
PURPOSE: Subroutine QPLOTZ5 calculates the scalinginformation needed to generate the formatto label the left-hand side of the program.
CALLING SEQUENCE: CALL QPLOTZS (PDQ)
ARGUMENT: PDQ Scaling factor for ordinate plot
COMMON BLOCKS: XRPLOTF, XRPLOTQ
SUBROUTINES CALLED: NONE
COMMENTS:
45
NAME: SUBROUTINE READ
PURPOSE: Subroutine READ reads the offset data ofthe strut or body and checks for error.
CALLING SEQUENCE: CALL READ
ARGUMENTS: NONE
COMMON BLOCKS: OFFSET, NAME, NORM
SUBROUTINE CALLED: NONE
CALLED BY: CHEB
COMMENTS:
46
7I
NAME: SUBROUTINE REFLKT
PURPOSE: Subroutine REFLKT reflects all thesymmetrical matrices of T and W.
CALLING SEQUENCE: CALL REFLKT
ARGUMENTS: NONE
COMMON BLOCKS: AUX, OMEGA
SUBROUTINE CALLED: NONE
CALLED BY: RWAVE
COMMENTS:
47
-,.- --. , - - --i
NAME: SUBROUTINE RINIT
PURPOSE: Subroutine RINIT initializes the T and Warrays to zero.
CALLING SEQUENCE: CALL RINIT
ARGUMENT: NONE
COMMON BLOCKS: AUX, OMEGA
SUBROUTINE CALLED: NONE
CALLED BY: RWAVE
COMMENTS:
48
NAME: SUBROUTINE RINTEG
PURPOSE: Subroutine RINTEG evaluates the integrandfor T and W functions.
CALLING SEQUENCE: CALL RINTEG (ALFA, B, D, NLOC2, WTINT,SEPCOS, SQ)
ARGUMENTS: ALFA Integrating variable aB CSTRUT (I) / XLSD CSTRT2 ([)/XLSNLOC2 Flag indicating the presence of
a second strut(O if single strut
NLOC21 if tandem struts
WTINT Reighting constant for theintegrand
SEPCOS Value of the cosine function inthe integrand
SQ Value of part of the integrand
1(a2 _ -2)
COMMON BLOCKS: AUX, OMEGA
SUBROUTINE CALLED: BESSJ
CALLED BY: RWAVE
COMMENTS:
49
=' -2 .. . . ... -I
NAME: SUBROUTINE RWAVE
PURPOSE: Subroutine RWAVE computes the auxiliaryfunction of T and W.
CALLING SEQUENCE: CALL RWAVE (B, D, NLOC2)
ARGUMENTS: B CSTRUT (I)/XLSD CSTRT2 (I)/XLSNLOC2 Flag indicating the presence
of a second strut
=0 if single strut
1 if tandem struts
COMMON BLOCKS: OUT, AUX, OMEGA, PSI
SUBROUTINES CALLED: RINIT, SIMPSN, RINTEG, BESSJ, REFLKT
CALLED BY: SWATH
COMMENTS:
Typical Auxiliary Functions
. T~is.(2m-IX2n-1) I DJ 1(~,J a (a 1-b 7os)xEI(a()WS"0 a- -- o2s O'Ls' S io 2 |, (a) J2. , ,
where
Es .
SI-Sfos (2u' )
50
_ _~~ . . °_, J,. .,. ' . .
NAME: SUBROUTINE RWOUT
PURPOSE: Subroutine RWOUT computes and prints dragcoefficients and total resistance of thetest model.
CALLING SEQUENCE: CALL RWOUT (I, NLOC2)
ARGUMENTS: I Index indicating strut locationNLOC2 Flag indicating the presence of
a second strut0 if single strut
NLOC 21if tandem struts
COMMON BLOCKS: OUT, AUX, OMEGA
SUBROUTINES CALLED: SUM, FUNCTION FORMDR, FUNCTION CFIT'C
CALLED BY: SWATH
COMMENTS:
'P51
NAME: SUBROUTINE SCALE
PURPOSE: Subroutine SCALE ccmputes scaling factorsand scales the input for length between-1.0 and +1.0 maximum beam and sectionalarea to 1.0.
CALLING SEQUENCE: CALL SCALE (ISBODY)
ARGUMENT: ISBODY Logical flag indicating, "Is thisfor body?"
ISBODY= TRUE . for body
FALSE. for strut
COMMON BLOCKS: OFFSET, NAME, NORM
SUBROUTINE CALLED: NONE
CALLED BY: CHEB
COMMENTS:
52
NAME: SUBROUTINE SIMPN
PURPOSE: Subroutine SIMPSN sets up Simpson'smultipliers for numerical integration by
Simpson's rule.
CALLING SEQUENCE: CALL SIMPSN (NPTS, SIMP)
ARGUMENTS: NPTS Number of integration stepsSIMP Array containing Simpson's
multipliers
COMMON BLOCKS: NONE
SUBROUTINE CALLED: NONE
CALLED BY: RWAVE
COMMENTS:
53
NAME: SUBROUTINE SPLINE
PURPOSE: Subroutine SPLINE fits smooth splinesegments through a given set of discretedata points.
CALLING SEQUENCE: CALL SPLINE (X, Y, D, N, BC, KODE, KKODE,ISBODY)
ARGUMENTS: X Value of abscissas of offset dataY Value of ordinates of offset dataD Value of second derivatives at a
pointN Total number of offset data
pointsBC Value of boundary conditions
0 if user is specifying boundary
conditionsKODE = 1 if user is taking an extra-
polation of second derivativesas boundary conditions
0 if there is no printout fromspline routine
KKOOE = I if spline prints abscissas,ordinates and second derivatives
ISBODY Logical flag indicating, "Is thisfor body?"
SOD TRUE . for bodyISBODY =
K FALSE . for strut
COMMON BLOCKS: NONE
SUBROUTINE CALLED: NONE
CALLED BY: CHEV
COMMENTS:
54
- - -
NAME: SUBROUTINE SUM
PURPOSE: Subroutine SUM computes sums of the form:
M NE E {Asm Asn Tsmn + Bsm Bsn Wsmn}
m=l n=l
CALLING SEQUENCE: CALL SUM (L, SUM1S, SUM1B, SUMISB, SUM12S,SUM12B, SUM12SB)
ARGUMENTS: L Number of different hullseparation distances
SUMiS Partial sum for strut 1SUM1B Partial sum for body 1SUMlSB Partial sum for interaction
between strut I and body 1SUM12S Partial sum for interaction
between strut 1 and strut 2SUM12B Partial sum for interaction
between body 1 and body 2SUM12SB Partial sum for interactions
between strut 1 and body 2 orstrut 2 and body 1
COMMON BLOCKS: AUX, OMEGA, COEFS
SUBROUTINE CALLED: NONE
CALLED BY: RWOUT
COMMENTS:
SUMIS
SUM412S IWSJTI ---- M .S1
%. -0
5UM12SBODY I B5ODY
SUM18
55
NAME: FUNCTION SU4SPL
PURPOSE: Function SUMSPL uses the spline coefficientsand integrates the trigonometric integralsF(X)*SIN(AK*X) or F(X)*COS(AK*X).
CALLING SEQUENCE: SUM = SUMSPL (X, Y, S, N, AK, KODE)
ARGUMENTS: X Values of abscissas of offset dataY Values of ordinates of offset dataS Values of second derivativesN Total number of data pointsAK (2m-1) or Oml m = 1,2,3 . ..MMAX
+1 if sine integration desiredKODE
D -1 if cosine integration desired
COMMON BLOCKS: NONE
SUBROUTINE CALLED: NONE
CALLED BY: CHEV
50j
I
NAME: SUBROUTINE SURFACE
PURPOSE: Subroutine SURFACE finds the wetted surfacearea of the strut or body as well as thewaterplane area or displaced volume.
CALLING SEQUENCE: CALL SURFACE (AMC, BMC, MM1XX, ISBODY)
ARGUMENTS: AMC Coefficients of the ChebychevCosine Series
BMC Coefficients of the ChebychevSine Series
MMAX Maximum order of the Chebychevpolynomials
ISBODY Logical flag indicating "Is thisfor body?"
rD TRUE for bodyISBODY =
K FALSE for strut
COMMON BLOCKS: OUT, NAME
SUBROUTINES CALLED: WTSURFS, WTSURFB
CALLED BY: CHEB
COMMENTS:
57
NAME: SUBROUTINE WTSURFB
PURPOSE: Subroutine WTSURFB determines the surfacearea of a body of revolution given by theChebychev coefficients.
CALLING SEQUENCE: CALL WTSURFB (AMC, BMC, MMAX)
ARGUMENTS: AMC Coefficients of the ChebychevCosine Series
BMIC Coefficients of the ChebychevSine Series
WMAX Maximum order of the ChebychevSeries
COMMON BLOCK: OUT
SUBROUTINE CALLED: EVAL
CALLED BY: SURFACE
COMMENTS:
58
NAME: SUBROUTINE WTSURFS
PURPOSE: Subroutine WTSURFS determines the wettedsurface area of a strut whose thicknessdistribution is given by the Chebychevcoefficients.
CALLING SEQUENCE: CALL WTSURFS (AMC, BMC, MMAX)
ARGUMENTS: AMC Coefficients of Chebychev CosineSeries
BMC Coefficients of Chebychev SineSeries
MMAX Maximum order of ChebychevSeries
COMMON BLOCK: OUT
SUBROUTINE CALLED: EVAL
CALLED BY: SURFACE
COMMENTS:
59
NAME: FUNCTION YINTP
PURPOSE: Function YINTP interpolates through a set ofdiscrete data.
CALLING SEQUENCE: FR = YINTP (XA, X, Y, N)
ARGUMENTS: XA Point to be interpolatedX Array of ordinate dataY Array of abscissa dataN Number of data points
COMMON BLOCKS: NONE
SUBROUTINE CALLED: NONE
CALLED BY: FORMDR
COMMENTS: Uses linear interpolation
60
j 4
PROGRAM DOCUMENTATION OF SYNTHESIS
61
COMMON BLOCK DEFINITIONS FOR SYNTHESIS
62
COMON/AUX/
PURPOSE: AUX stores the auxiliary wave resistance function table.
NAME TYPE LENGTH DEFINITION
TS R (3,3) Auxiliary function T for strut
WS R (3,3) Auxiliary function W for strut
TB R (3,3) Auxiliary function T for body
WB R (3,3) Auxiliary function W for body
TSB R (3,3) Auxiliary function T for strut tobody
WSB R (3,3) Auxiliary function W for strut tobody
TS12 R (3,3) Auxiliary function T for strut 1to strut 2
WS12 R (3,3) Auxiliary function W for strut Ito strut 2
TBI2 R (3,3) Auxiliary function T for body I tobody 2
WB12 R (3,3) Auxiliary function W for body 1 tobody 2
TSBl2 R (3,3) Auxiliary function T for strut I tobody 2
WSB12 R (3,3) Auxiliary function W for strut 1 tobody 2
TSBP R (3,3) Auxiliary function T
WSBP R (3,3) Auxiliary function W
TSB12P R (3,3) Auxiliary function T
WSB12P R (3,3) Auxiliary function W
63
CO140N/BARCK/IE /
PURPOSE: BARCK stores the variables which define the propulsordesign condition.
NAME TYPE LENGTH DEFINITION
IE I Error message pointer
0,if program ran in normal fashion
lO0,if limiting value of P/D has been used
200,if there is an iteration malfunction -- PD(2)used for P/D
SE -- 3,if maximum BAR, 0.95, used -- marine screw
4,if minimum BAR, .4, used -- marine screw
5,if maximum tip speed used -- air screw
6,if blade number is outside program limit --
closest number used
64
COMtON/CDESC/
PURPOSE: CDESC stores the values of constants which define waterproperties.
NAME TYPE LENGTH DEFINITION
RHOD R (3) Water density array
ANUD R (3) Kinematic viscosity array
IP I Pointer indicating the particularwater condition used. Set IP Ifor this program to obtain sea watercondition.
65
COM1ON/COEFS/
PURPOSE: COEFS stores the values of the Chebyehev coefficients forthe strut and body.
NAME TYPE LENGTH DEFINITION
ASM R (3) Coefficients of Chebychev Sine Series for strut
BSM R (3) Coefficients of Chebychev Cosine Seriesfor strut
ABM R (3) Coefficients of Chebychev Sine Series forbody
BBM R (3) Coefficients of Chebychev Cosine Seriesfor body
M!AX I Maximum order of Chebychev Series
66
- r - - -
COMMON/CPROP/
PURPOSE: CPROP stores the values of the variables and constantsused in the propulsor design routine.
NAME TYPE LENGTH DEFINITION
IPTYP I (3) Indicating propeller type
DIAM R (3) Diameter of propeller (ft)
VADES R (3) Speed of advance of propulsor at designcondition (kts)
RPMDES R (3) RPM of propeller at design point
TDES R (3) Thrust of propulsor system (lbs)
QDES R (3) Torque of propulsor system (ft-lbs)
EFFDES R (3) Efficiency of propulsor at designcondition
OMWTD R (3) Thrust wake (1-wT)
CAV R (3) Percent back cavitation allowed on water
screw
Z I (3) Number of blades of propeller
H R (3) Depth of water to centerline ofpropulsor shaft
BAR R (3) Blade area ratio
PD R (3) P/D of propulsor
3 R (3) J of propulsor
IERROR I (3) Error message indicator
KT R (3) Thrust coefficient (1T)
KQ R (3) Torque coefficient (K )
p
67
COWION/INPUT/
PURPOSE: INPUT stores input data.
NAME TYPE LENGTH DEFINITION
XLS R Length of strut L (ft)
HS R Draft of strut HS (ft)
TSMAX R Maximum thickness of strut t (ft)maxCWP R Waterplane area coefficient C - AW/(L t
where AW - waterplane are of one strut
CLCF R Waterplane moment coefficientCLCF Mx/(AL)*
CIYY R Waterplane inertia coefficient,C .... I I(A • Ls&)*
XLB R Length of body LS (ft)
HE R Draft of body HS (ft)
AX R Maximum cross-sectional area of body AX (ft 2
CP R Body prismatic coefficient C - h/(A, Lb)where Vb - displaced volume of one boay
CLCB R Body moment coefficientCLCB MxB/(Ve - Le)*
SEPDIS R Separation distance between centerline of thetwo bodies (ft)
CSTRUT R Distance from centerliue of strut tocenterline of body (ft)
CSTRT2 R Distance from centerline of second strut
to centerline of body (ft)
PDIA R Diameter of propeller D (ft)
SPAN R Span of a demi-fin (ft)
CHORD R Chord of a fin (ft)
TFINS R Maximun thickness of a demi-fin (ft)
NLOC I Switch indicating the presence of asecond strut
•All moments and moments of Inertia are taken about the mid-length of the
respective strut or body.
68
COMMON/OFFDES/
PURPOSE: OFFDES stores the variables which define the coefficientsof KT/KQ curves.
NAME TYPE LENGTH DEFINITION
PJAY R (4) Coefficients of polynomial representingKT or KQ.
I P
69
COt.ON/OMEGA/
PURPOSE: OMEGA stores the values of variables and constants forevaluation of auxiliary functions and ship resistancecoefficients.
NAME TYPE LENGTH DEFINITION
VMFPS R Speed of shipV K (kts)
GAMAOS R - g Ls/V2 where U is speed in fps
GAMAOB R Yob - g Lb/V 2
GOSQ R (Yos) 2
HSOLS R Ratio of draft to length of strut H s/LS
HBOLB R Ratio of draft to length of body Rb/Lb
WETS R Wetted surface area of strut S (ft2 )S
WETB R Wetted surface area of body Sb (ft2)
WETFIN R Wetted surface area of a fin Sf (ft2 )
WTSURF R Total wetted surface area
SEP R 2b/'os" Ls)
PHIS R h2 1 )yos
PHIB R hS
RATIOL R Yob/Yos
CFS R Frictional drag coefficient of strut CF
CFB R Frictional drag coefficient of body CF
APPDRG R Appendage drag (lb)
70
- - -.. .%
COMMON/PCOF/
PURPOSE: PCOF stores coefficients for KQ/KT polynomial
approximation.
NAME TYPE LENGTH DEFINITION
CT R (4) Coefficients of the polynomial which
is an approximation of the KT curve
CQ R (4) Coefficients of the polynomial which
is an approximation of the KQ curve
71
COMMON/PHYSCO/
PURPOSE: PHYSCO stores physical constants.
NAME TYPE LENGTH DEFINITION
RHO R Density of water
GNU R Kinematic viscosity of water
G R Acceleration due to gravity
PI R Ratio of circumference to diameter of acircle
DELCF R Correction allowance of friction dragfrom ITTC line.
72
--- --
COMMON/PLOT/
PURPOSE: PLOT stores the constants and characters for the plotting
routine.
NAME TYPE LENGTH DEFINITION
NFIRST I Position in the arrays of the firstordered pair to be plotted
NLAST I Position in the arrays of the lastordered pair to be plotted
NPOINT I NPOINT equals "1" if each point fromNFIRST to NLAST is to be plotted, "2"if every other point is to be plotted,etc.
XMAX R Value of abscissa at right-most grid line
XMIN R Value of abscissa at left-most grid line
NSCLI L Logical value (Should be false if PLOTI
has not been called and standard grid is
desired)
NCHAR I Number of valid characters in label
NSCALE I (4) Printing scale factor of ordinate
PCHAR I (2) Plotting characters
73
777-
COMMON/PSI/
PURPOSE: PSI stores the values of the variables and constants usedin integration routines.
NAME TYPE LENGTH DEFINITION
NPTSZ I Number of integration steps from y to y+l
PTSAF R Scaling fpctor of step size in integratingfrom %max to CtZsmax
EXPN R Empirical constant for integration to stop
NALMAX R Maximum number of integration steps fromy+l to amax
NAL I Counter of integration steps
TAIL R Integration correction made from amax to
tZsmax
ALFA R Integrating variable (a)
ALSMAX R Maxivim of a for integration
NSTEPS I Number of integration steps from amax toa91smax
74
. .. ... . m i .. . . .. .I " l... ' . . .. .
COMMON/ROOTC/
PURPOSE: ROOTC stores the coefficients of a third order polynomialwhich is the approximation of the KT curve of a propeller.
NAME TYPE LENGTH DEFINITION
A R 4 Array holding the coefficient of a thirdorder polynomial which is the approximationof the KT curve of a propeller
7 5
C0144N/XRPLOTF/
PURPOSE: XRPLOTF stores the values of variables for the plottingroutine.
NAME TYPE LENGTH DEFINITION
XL R Value of abscissa at left-most grid line
XH R Value of abscissa at right-most grid line
YL R Value of ordinate at bottom grid line
YH R Value of ordinate at top grid line
XMOV R Abscissa index increment number for array GRAF
YMOV R Ordinate index increment number for array GRAF
76
COMMON/XRPLOTG/
PURPOSE: XRPLOTG stores the values and characters of variables forthe plotting routine.
NAME TYPE LENGTH DEFINITION
GRAF I (11,204) Array containing the image to be plotted
77
COMMON/XRPLOTQ
PURPOSE: XRPLOTQ stores the constants and characters for the plotting
routine.
NAME TYPE LENGTH DEFINITION
I I Ordinate scale factor is 10I
J I Number digits following ordinate decimalpoint
K I Abscissa scale factor is 1 0K
L I Number digits following abscissa decimal
point
NHL I Number of horizontal grid lines
NSBH I Number of spaces between adjacenthorizontal grid lines
NVL I Number of vertical grid lines
NSBV I Number of spaces between adjacentvertical grid lines
HCHAR I Plotting character of horizontalgrid lines
ISX I Number of horizontal spaces
ISY I Number of vertical spaces
V L Logical variable, = . TRUE . when themaximum and minimum values of the ordinateare determined
H L Logical variable, = TRUE . when themaximum and minimum values of the abscissaare determined
78
SUBROUTINE DOCUMENTATION FOR SYNTHESIS
79
NAME: PROGRAM SYNTH
PURPOSE: Program SYNTH is the main program forcalculating the propulsor resistance anddesign for SWATH ships.
CALLING SEQUENCE: PROGRAM SYNTH (INPUT, OUTPUT, TAPE 5
INPUT, TAPE 6 =OUTPUT, TAPE 8)
ARGUMENTS: NONE
COMMON BLOCKS: COEFS, INPUT, OMEGA, PHYSCO, PSI
SUBROUTINES CALLED: RIN, CHEB, RWAVE, FINDRG, ROUT, SHPCMP,
Function CFITTC
COMM4ENTS:
80
NAME: SUBROUTINE BESSJ
PURPOSE: Subroutine BESSJ evaluates the Bessel functionfrom order 0 to order N.
CALLING SEQUENCE: CALL BESSJ (X, N, VJ)
ARGUMENTS: X Argument of the Bessel functionN Maximum order of the Bessel functionVJ Array holding (N+I) values of the
Bessel function of order zero up toN, where
VJ(O) = Jo(X)
VJ(N) JN(X)
COMMON BLOCKS: NONE
SUBROUTINE CALLED: NONE
CALLED BY: RINTEG, RWAVE
COMMENTS:
81
I
NAME: SUBROUTINE BURIL
PURPOSE: SUBROUTINE BURIL uses Burrill's cavitationcriteria to determine if the blade arearatio (BAR) used is sufficient and, if itis not, to estimate what BAR is necessary.
CALLING SEQUENCE: CALL BURIL (T, D, H, VA, N, CAVI, BAR,IERROR, PD, NRET)
ARGUMENTS: T Thrust of propeller (lbs)D Diameter of propeller (ft)H Depth of propeller shaft (ft)VA Speed of advance (fps)N RPM of propellerCAVI Percent back cavitation allowedBAR Blade area ratioIERROR Error message indication as defined
in Common Block BARCKPD P/D of propellerNRET Internal flag indicating BAR
optimization
rO if not optimizedNRET
1 if optimized
COION BLOCK: BARCK
SUBROUTINE CALLED: NONE
CALLED BY: PRODES
COMMENTS:
82
- i&A
NAME: FUNCTION CALC
PURPOSE: FUNCTION CALC calculates "KT" or "KQ" fortwo to seven-bladed propellers, given J,BAR, P/D, Z, and an indicator for "K'T" or
~"KQ ."
CALLING SEQUENCE: TQ : CALC (J, BAR, PD, Z, ITQ)
ARGUMENTS: J Advance coefficient of propellerBAR Blade area ratioPD P/D of propellerZ Number of bladesITQ Index defined by
I if thrust is inputITQif power is input
COMMON BLOCK: OFFDES
SUBROUTINE CALLED: NONE
CALLED BY: TROOST, ROOT, POLCOF
COMMENTS:
83
NAME: FUNCTION CFITTC
PURPOSE: Function CFITTC determines the ITTCfrictional resistance coefficient C7
CALLING SEQUENCE: CF = CFITTC (RN)
ARGUMENT: RN Reynolds number at R at test conditions
COMMON BLOCKS: NONE
SUBROUTINE CALLED: NONE
CALLED BY: SYNTH
COMMENTS: 0.075
C[logl 0(Rn) -2]
84
NAME: SUBROUTINE CHEB
PURPOSE: Subroutine CHEB determines the Chebychevcoefficients and wetted surface area ofthe strut and body. It also plots thestrut waterline and the body areadistribution.
CALLING SEQUENCE: CALL CHEB (TITLE)
ARGUMENT: TITLE Array containing the 9lphanumeric char-acters of the title of the experiment
COMMON BLOCKS: COEFS, INPUT, OMEGA, PHYSCO
SUBROUTINES CALLED: WSURFB, WSURFS, PCHEB
CALLED BY: SYNTH
COMM.ENTS:
85
I-NAME: SUBROUTINE ERROR
PURPOSE: Subroutine ERROR prints the error message of
the propulsor design.
CALLING SEQUENCE- CALL ERROR (IE)
ARGUMENT: IE Error message pointer as defined
in Common Block BARCK
COMMON BLOCKS: NONE
SUBROUTINE CALLED: NONE
CALLED BY: PROPP
COMMENTS:
86
NAME: FUNCTION EVAL
PURPOSE: Function EVAL evaluates the Chebychev Series:
WMAXF(X) = Z A(M) * U(M,X) + B(M) * V(M,X)
M= 1
CALLING SEQUENCE: EV =EVAL (X,A,BJIMKAX)
ARGUMENTS: X Arguments of the Chebychev SeriesA Coefficients of the Chebychev
Cosine SeriesB Coefficients of the Chebychev Sine
SeriesMMAX Maximum order of the Chebychev Series
COMMON BLOCKS: NONE
SUBROUTINE CALLED: NONE
CALLED BY: WSIJRFS, WSURFB
COMMON BLOCKS: NONE
SUBROUTINE CALLED: NONE
CALLED BY: WSURFS, WSURFB
COMMENTS: UM(X) = Cos((2M-l)(6)]
VM(X) = Sin 2M 0
0 = Sin 1 (X)
87
NAME: SUBROUTINE FINDRG
PURPOSE: Subroutine FINDRG determines the fin drag.
CALLING SEQUENCE: CALL FINDRG (RHOS, XNUS, VSFW, SFINS,TFINS, CFINS, TBFINS, SBFINS, DS)
ARGUMENTS: RHOS Density of waterXNUS Kinematic viscosity of waterVSFW Ship speed (fps)SFINS Chord * spanTFINS Thickness of a fin (ft)CFINS Chord of a fin (ft)TBFINS 0.01 * TFINSSBFINS TBFINS * spanDS Total fin drag
COMMON BLOCKS: NONE
SUBROUTINES CALLED: FRICT, FOILSC
CALLED BY: SYNTH
COMMENTS:
88
AD-A099 533 DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CE--ETC F/6 20/4DOCUMENTATION FOR SWATH SHIP RESISTANCE AND PROPULSION PREDICTI--ETC(U)
UNCLASSIFIED DTNSRDC/SPD-0927-0223IIIIIIfIIIII
EEEEEEEEIIIIEEIIIIIIIIIIIIII~hIIIEEEIIIIIIEEEEEEIIIIIIEEEEEIIEEEEEEEIIEEEIIEEEEEEIIIIIE
lI25 I 41.01 1 3,
NAME: SUBROUTINE FOILSC
PURPOSE: Subroutine FOILSC calculates the dragcomponents for a symmetrical foil section.
CALLING SEQUENCE: CALL FOILSC (XS, CFS, TOC, TOC2, TOC4, SS,TS2, SBS, CLOTB, RFS, RFVAS, RPS, RINTS,RBS)
ARGUMENTS: XS Ship constant = *p* SFINSVSFW ** 2
CFS Flat plate friction coefficientTOC Thickness/chord ratioTOC2 T/C**2TOC4 T/C**4SS Chord * span = area of foilTS2 (SS) ** 2 area squaredSBS TBFINS * spanCLOTB Chord/O.01 * TFINSRFS Frictional resistance of a flat
plateRFUAS Resistance due to velocity
argumentationRPS Resistance due to pressure and
separationRINTS Resistance due to intersection
with hullRBS Base drag due to bluntness of
trailing edge
COMMON BLOCKS: NONE
SUBROUTINE CALLED: NONE
CALLED BY: FINDRG
COMMENTS:
89
-- kv -2
NAME: FUNCTION FORMDR
PURPOSE: Function FORMDR evaluates the form dragcoefficient.
CALLING SEQUENCE: FDR = FORMDR (VL)
ARGUMENT: VL Ratio of ship speed to square root oflength of strut V/AL-S
COMMON BLOCKS: NONE
SUBROUTINE CALLED: FUNCTION YINTP
CALLED BY: RWOUT
COMMENTS:
1.0
.9
I
09
NAME: SUBROUTINE FRICT
PURPOSE: Subroutine FRICT calculates the flat platefriction coefficient based on the localReynolds number.
CALLING SEQUENCE: CALL FRICT (CF, VF, XLEN, XNU)
ARGUMENTS: CF Flat plate friction coefficientVF Speed of ship (fps)XLEN Chord of fin (ft)XNU Kinematic viscosity
COMMON BLOCKS: NONE
SUBROUTINE CALLED: NONE
CALLED BY: FINDRG
COMMENTS:
91
NAME: SUBROUTINE PCHEB
PURPOSE: Subroutine PCHEB plots by line printer thebody sectional area curve and waterplaneoutline curve from the given Chebychevcoefficients.
CALLING SEQUENCE: CALL PCHEB (AS, BS, AB, BB, NN, TITLE)
ARGUMENTS: AS Coefficients of Chebychev SineSeries for strut
BS Coefficients of Chebychev CosineSeries for strut
AB Coefficients of Chebychev SineSeries for body
BB Coefficients of Chebychev CosineSeries for body
NN Maximum order of Chebychev SeriesTITLE Array containing the alphanumeric char-
acters of the title of the experiment
COMMON BLOCKS: PLOT, XRPLOTQ
SUBROUTINES CALLED: PLOT1, PLOT2, PLOT3, PLOT4
CALLED BY: CHEB
COMMENTS:
92
NAME: SUBROUTINE PLOT1
PURPOSE: Subroutine PLOT1 sets up spacing anddetermines the values of the axes.
CALLING SEQUENCE: CALL PLOT 1 (NSCALE, A, B, C, D, E, F)
ARGUMENTS: NSCALE Integer array defined asfollows:
NSCALE (1) = I, if printed values of theordinate are 10 ** I timesthe actual value
NSCALE (2) = J, if printed values of theordinate are 10 ** J timesthe actual value
NSCALE (3) = K, if printed values of theabscissa are 10 ** K timesthe actual values
NSCALE (4) = L, if printed values of theabscissa are 10 ** L timesthe actual value
A Integer number ofhorizontal grid lines
B Integer number of spacesbeyond each horizontal grid
line to the next grid lineC Integer number of vertical
grid lines
D Integer number of spacesbeyond each vertical gridline to the next grid line
E Horizontal grid characterF Vertical grid character
COMMON BLOCK: XRPLOTQ
SUBROUTINE CALLED: NONE
CALLED BY: PCHEB
COMMENTS:
93
. . .. .- --- l,' l . ,
NAME: SUBROUTINE PLOT2
PURPOSE: Subroutine PLOT2 examines the minimum andmaximum values of the abscissa and theordinate and establishes an internalformula for computing location in the imageregion corresponding to the point to beplotted.
CALLING SEQUENCE: CALL PLOT2 (XMAX, XMIN, YMAX, YMIN, NSCLI)
ARGUMENTS: XMAX Value of abscissa at right-mostgrid line
XMIN Value of abscissa at left-mostgrid line
YMAX Value of ordinate at top gridline
YMIN Value of ordinate at bottom gridline
NSCLI Logical flag (should be false,if PLOT1 has not been called andstandard grid is desired)
COMMON BLOCKS: XRPLOTF, XRPLOTQ, XRPLOTG
SUBROUTINE CALLED: NONE
CALLED BY: PCHEB
COMMENTS:
94
NAME: SUBROUTINE PLOT3
PURPOSE: Subroutine PLOT3 assigns an alpha-characterto each point to be plotted.
CALLING SEQUENCE: CALL PLOT3 (PCHAR, X, Y, SDATA, FDATA, DDATA)
ARGUMENTS: PCHAR Plotting characterX Array containing the X coordinates
to be plottedY Array containing the Y coordinates
to be plottedSDATA Integer position in the arrays of
the first ordered pair to be plottedI if each point from SDATA to DDATAis to be plotted
FDATA =2 if every other point is to beplotted
3 if every third point is to beplotted
DDATA Integer position in the array of thelast ordered pair to be plotted
COMMON BLOCKS: XRPLOTF, XRPLOTG
SUBROUTINE CALLED: NONE
CALLED BY: PCHEB
COMMENTS:
95
, !.
NAME: SUBROUTINE PLOT4
PURPOSE: Subroutine PLOT4 prints the image of thecompleted graph on the printer, includingthe values of the abscissa and the ordinateat the grid lines outside the bottom andleft edge of the graph.
CALLING SEQUENCE: CALL PLOT4 (MCHAR, NCHAR)
ARGUMENTS: MCHAR Single dimension array containingalpha characters to be plotted atthe left of the graph
NCHAR Number of valid characters inMCHAR
COMMON BLOCKS: XRPLOTF, XRPLOTG, XRPLOTQ
SUBROUTINE CALLED: QPLOTZ5
CALLED BY: PCHEB
COMMENTS:
96
NAME: SUBROUTINE POLCOF
PURPOSE: Subroutine POLCOF determines thecoefficients of the polynomials whichapproximate the KT and KQ curves.
CALLING SEQUENCE: CALL POLCOF ( PD, BAR, Z)
ARGUMENTS: PD P/D of propellerBAR Blade area ratioZ Number of blades
COMMON BLOCKS: OFFDES, PCOF
SUBROUTINE CALLED: Function CALC
CALLED BY: PROPER
COMMENTS:
97
NAME: SUBROUTINE PRODES
PURPOSE: Subroutine PRODES is used in the designof a propulsion system to determinecharacteristics and performance at thedesign condition.
CALLING SEQUENCE: CALL PRODES (IS)
ARGU1ENT: IS Type of propulsor (in thisprogram set equal to 1 toindicate conventional fixedblade propellers)
COMMtON BLOCKS: BARCK, CDESC, CPROP
SUBROUTINES CALLED: TROOST, BURIL
CALLED BY: SHPCMP
COMMENTS:
98
NAME: SUBROUTINE PROPER
PURPOSE: Subroutine PROPER calculates the open watercurves' table and off-design performance ofpropulsor system "IS."
CALLING SEQUENCE: CALL PROPER (IS, VOF, TOF, PWR, TITLE)
ARGUMENTS: IS Type of propulsor system (in thisprogram, set to I to indicateconventional fixed blade propellers)
VOF Off design speed (ft)TOF Off design thrust (lbs)PWR SHP at off design conditionTITLE Array containing the alphanumeric
characters of the title of theexperiment
COMMON BLOCKS: CDESC, CPROPR, PCOF, ROOTC
SUBROUTINES CALLED: POLCOF, ROOTP
CALLED BY: SHPCMP
COMMENTS:
99
NAME: SUBROUTINE PROPP
PURPOSE: Subroutine PROPP prints all data incommon block "CPROP"
CALLING SEQUENCE: CALL PROPP (IS, TITLE)
ARGUMENTS: IS Type of propulsor system (in thisprogram, set to 1 to indicateconventional fixed blade propellers)
TITLE Array containing the alphanumeric
characters of the title of the
experiment
COMMON BLOCK: CPROP
SUBROUTINE CALLED: ERROR
CALLED BY: SHPCMP
COMMENTS:
100
NAME: SUBROUTINE QPLOTZ5
PURPOSE: Subroutine QPLOTZS calculates the scalinginformation needed to generate the formatto label the left-hand side of the program.
CALLING SEQUENCE: CALL QPLOTZ5 (PDQ)
ARGUMENT: PDQ Scaling factor for ordinate plot
COMMON BLOCKS: XRPLOTF, XRPLOTQ
SUBROUTINES CALLED: NONE
COMMENTS:
101
NAME: SUBROUTINE REFLKT
PURPOSE: Subroutine REFLKT reflects the symmetricalmatrices to T and W.
CALLING SEQUENCE: CALL REFLKT
ARGUMENTS: NONE
COMMONG BLOCKS: AUX, COEFS
SUBROUTINE CALLED: NONE
CALLED BY: RWAVE
COMMENTS:
102
NAME: SUBROUTINE RIN
PURPOSE: Subroutine RIN reads input data for theprogram.
CALLING SEQUENCE: CALL RIN (TITLE)
ARGUMENT: TITLE Array containing the alphanumeric char-acters of the title of the experiment
COMMON BLOCK: INPUT
SUBROUTINE CALLED: NONE
CALLED BY: SYNTH
COMMENTS:
103
NAME: SUBROUTINE RINIT
PURPOSE: Subroutine RINIT initializes the T and Warrays.
CALLING SEQUENCE: CALL RINIT
ARGUMENTS: NONE
r.Of'ON BLOCKS: AUX, COEFS
SUBROUTINE CALLED: NONE
CALLED BY: RWAVE
COMMENTS:
104
NAME: SUBROUTINE RINTEG
PURPOSE: Subroutine RINTEG provides numericalintegration for the auxiliary functionof T and W.
CALLING SEQUENCE: CALL RINTEG (ALFA, B, D, NLOC2, WTINT,SEPCOS, SQ)
ARGUMENTS: ALFA Integrating variable (a)B Ratio of distance between
centerlines of strut and bodyto the length of strut
D Ratio of distance betweencenterlines of second strutand body to the length ofstrut
0 if single strutNLOC2
1 if tandem strutsWTINT Weighting constant for numerical
integration.A SEPCOS Value of the Cosine function in
the integrand1
SQ Value of (,2_ .2)- in the integrand
COMMON BLOCKS: AUX, COEFS, INPUT, OMEGA
SUBROUTINE CALLED: BESSJ
CALLED BY: RWAVE
COMMENTS:
105
NAME: SUBROUTINE ROOT
PURPOSE: Subroutine ROOT uses the 'egula Falsimethod to find the intersection of the"K" curve and the "IK/J**2"I curve.
CALLING SEQUENCE: CALL ROOT (PD, Z, BAR, COEFF, IPJ, ITQ,KT, KQ, EFFIN, J2)
ARGUMENTS: PD P/D of propellerZ Number of bladesBAR Blade area ratioCOEFF Optimization coefficients as
defined !t; TROOSTIPJ Optimization index defined by:
1, no optimization2, optimize N with KT/J**2
IPJ 3, optimize N with KQ/J**34, optimize D with KT/J**4
L 5, optimize D with KQ/J**5ITQ Index indicating the following:
1, if thrust is inputITQ =
L 2 , if power is inputKT Thrust coefficientKQ Torque coefficientEFFIN Open water efficiencyJ2 Advance coefficient
COMMON BLOCK: ROOTC
SUBROUTINE CALLED: FUNCTION CALC
CALLED BY: TROOST
COMMENTS:
106
NAME: SUBROUTINE ROUT
PURPOSE: Subroutine ROUT outputs the computed resultsfor all components of drag coefficients andeffective horsepower.
CALLING SEQUENCE: CALL ROUT (TITLE,EHP)
ARGUMENTS: TITLE Array containing the alphanumeric char-acters of the title of the experiment
EHP Effective horsepower of the ship
COMMON BLOCKS: INPUT, OMEGA, PHYSCO
SUBROUTINES CALLED: SUM, Function FORMDR
CALLED BY: SYNTH
COMMENTS:
107
NAME: SUBROUTINE RWAVE
PURPOSE: Subroutine RWAVE evaluates the auxiliaryfunctions of T and W.
CALLING SEQUENCE: CALL RWAVE (B, D, NLOC2)
ARGUMENTS: B Ratio of distance between center-lines of strut and body to thelength of strut
D Ratio of distance between center-lines of second strut and body tothe length of strut
NLOC2 Switch indicating the presence ofa second strut
NLOC2 = if single strut
Ij if tandem struts
COMMON BLOCKS: AUX, COEFS, INPUT, OMEGA, PHYSCO, PSI
SUBROUTINES CALLED: RINIT, SIMPSN, RINTEG, BESSJ, REFLKT
CALLED BY: SWATH
COMMENTS:
Typical Auxiliary Functions
2 *-a D (, 2 o ) S )( 2 m -Ia ' [ L S X ! (al). 2 (((MX.n)
where
3Ls(2U)2
108
NAME: SUBROUTINE SHPCMP
PURPOSE: Subroutine SHPCMP determines a propeller'sdesign and off-design performance and usesthis to determine shaft horsepower.
CALLING SEQUENCE: CALL SHPCMP (VDES, EHPDES, PDIA, BDIA, HB,VOFF, EHP, SHP, NV, TITLE)
ARGUMENTS: VDES Ship speed at design point (fps)EHPDES Effective horsepower at design
pointPDIA Diameter of propeller (ft)BDIA Diameter of hull body (ft)HB Draft of body (ft)VOFF Off-design speed of ship (fps)EHP Effec -'ve horsepower at off
design speedsSHP Shaft horsepower at off design
speedsNV Numb'r of test speedsTITLE Array containing the alphanumeric char-
,..,'ers of the title of the experiment
COMMON BLOCKS: CDESC, CPROP
SUBROUTINES CALLED: PRDES, PROPP, PROPER, PROPERO
CALLED BY: SYNT
COMMENTS:
109
NAME: SUBROUTINE SIMPSN
PURPOSE: Subroutine SIMPSN sets up Simpson'smultiplier table for numerical integrationusing Simpson's rule.
CALLING SEQUENCE: CALL SIMPSN (NPTS, SIMP)
ARGUMENTS: NPTS Number of integration steps (oddand greater than one)
SIMP Array containing Simpson'scoefficients
COMMON BLOCKS: NONE
SUBROUTINE CALLED: NONE
CALLED BY: RWAVE
COMMENTS:
110
NAME: SUBROUTINE SUM
PURPOSE: Subroutine SUM computes the matrix productsas follows:
n mSUM = E E Asm As T + Bsm Bsn Wsmn }
m=l n=l
CALLING SEQUENCE: CALL SUM (SUM1S, SUM1B, SUM1SB, SUM12S,SUM12B, SUM12SB)
ARGUMENTS: SUMiS Partial sum for strut 1SUMIB Partial sum for body 1SUM1SB Partial sum for interaction between
strut l and body ISUBM12S Partial sum for interaction between
strut 1 and strut 2SUMI2B Partial sum for interaction between
body I and body 2SUM12SB Partial sum for interactions between
body 1 and strut 2 or body 2 andstrut 1
COMMON BLOCKS: AUX, COEFS
SUBROUTINE CALLED: NONE
CALLED BY: ROUT
COMMENTS:
SUM12STI SU1S ____ RJ
%y I~ T I;
7n " I
SUM1B
-11-
NAME: SUBROUTINE TROOST
PURPOSE: Subroutine TROOST is used with SubroutineROOT and Function CALC. Either rpm ordiameter can be optimized given the other.
CALLING SEQUENCE: CALL TROOST (VA1, P, T, Ni, D, Z, PDNEW,BAR, KT, KQ, EFFNEW, J, ITQ, IPJ, RHO,IERROR)
ARGUMENTS: VAl Waked ship velocity (kts)P Torque per shaft (ft-lb)T Propeller thrust (lbs per shaft)N1 Propeller rpmD Propeller diameter (ft)Z Number of blades of propellerPDNEW P/D of propellerBAR Blade area ratioKT Thrust coefficientKQ Torque coefficientEFFNEW Open water efficiencyJ Advance coefficientITQ Index defined by:
1 if thrust is inputITQ i
2 if power is inputIPJ Optimization index defined by:
1 - no optimization, J known,I calculates KT, KQ, EFFNEW onlyi 2 - optimize N with KT/J**2
IPJ = 3 - optimize N with KQ/J**34 - optimize D with KT/J**4
.-5 -optimize D with KQ/J**5RHO Water densityIERROR Error message indicator
COMMON BLOCKS: NONE
SUBROUTINES CALLED: ROOT, TROST2, FUNCTION CALC
CALLED BY: PRODES
COMMENTS:
112
NAME: SUBROUTINE TROST2
PURPOSE: Subroutine TROST2 is used to calculatea single KT, KQ and efficiency value fora given propeller.
CALLING SEQUENCE: CALL TROST2 (KT, KQ, J, PDTR2, BAR, Z,EFFTR2)
ARGUMENTS: KT Thrust coefficientKQ Torque coefficientJ Advance coefficientPDTR2 Pitch to diameter ratioBAR Blade area ratioZ Number of bladesEFFTR2 Open water efficiency
COMMON BLOCKS: NONE
SUBROUTINE CALLED: Function CALC
CALLED BY: TROOST
COMMENTS:
A, 113
NAME: SUBROUTINE WSURFB
PURPOSE: Subroutine WSURFB determines the surfacearea of a body of revolution given byChebyehev coefficients.
CALLING SEQUENCE: CALL WFSURFB (AREA)
ARGUMENT: AREA Surface area of a body (ft2)
COMMON BLOCKS: COEFS, INPUT, PHYSCO
SUBROUTINE CALLED: FUNCTION EVAL
CALLED BY: CHEB
COMMENTS:
114
NAME: SUBROUTINE WSURFS
PURPOSE: Subroutine WSURFS determines the wettedsurface area of a strut.
CALLING SEQUENCE: CALL WSURFS (AREA)
ARGUMENT: AREA Wetted surface area of a strut (ft2)
COMMON BLOCKS: COEFS, INPUT
SUBROUTINE CALLED: FUNCTION EVAL
CALLED BY: CHEB
COMMENTS:
115
NAME: FUNCTION YINTP
PURPOSE: Function YINTP interpolates through a setof discrete data.
CALLING SEQUENCE: YTP =YINTP (XA, X, Y, N)
ARGUMENTS: XA Point to be interpolatedX Array of ordinate dataY Array of abscissa dataN Number of data points
COMMON BLOCKS: NONE
SUBROUTINE CALLED: NONE
CALLED BY: FORMDR
COMMENTS:
116
REFERENCES
(1) Lin, L.W. and W.G Day, "The Still-Water Resistance and PropulsionCharacteristics of Small-Waterplane-Area Twin-Hull (SWATH) Ships."AIAA/SNAME Advanced Marine Vehicles Conference. San Diego,California, 1974.
(2) Proceedings of the 10th International Towing Tank Conference,London, England, 1963. Published by the National PhysicalLaboratory, England.
(3) Lasky, M.P., "An Investigation of Appendage Drag." NSRDC/SPDReport 458-H-01.
(4) Roddy, R.F. and J. Strom-Tejsen, "Study of Air Cushion VehiclePropulsion System - Propulsor Design and Performance." NSRDC/SPD
Report 378-09.
117
APPENDICES
118
PROGR~AM LISTING OF CLOSEFIT
119
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AD-AIVV 533 DAVID W TAYLOR NAVAL SHIP RESEARCH AND OEVELOP NT CE- TC F/ 20/A
DOCUMENTATION FOR SWATH SHIP RESISTANCE AND PROPULSION PREOICTI--ETC(U)
UNCLASSIFIED DTNSRC/SPD-0927-02 L3.ffflIlllffff
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DTNSRDC ISSUES THREE TYPES OF REPORTS
1. DTNSRDC REPORTS, A FORMAL SERIES, CONTAIN INFORMATION OF PERMANENT TECH-NICAL VALUE. THEY CARRY A CONSECUTIVE NUMERICAL IDENTIFICATION REGARDLESS OFTHEIR CLASSIFICATION OR THE ORIGINATING DEPARTMENT.
2. DEPARTMENTAL REPORTS, A SEMIFORMAL SERIES, CONTAIN INFORMATION OF A PRELIM,INARY, TEMPORARY, OR PROPRIETARY NATURE OR OF LIMITED INTEREST OR SIGNIFICANCE.THEY CARRY A DEPARTMENTAL ALPHANUMERICAL IDENTIFICATION.
3. TECHNICAL MEMORANDA, AN INFORMAL SERIES, CONTAIN TECHNICAL DOCUMENTATIONOF LIMITED USE AND INIEREST. THEY ARE PRIMARILY WORKING PAPERS INTENDED FOR IN-TERNAL USE. THEY CARRY AN IDENTIFYING NUMBER WHICH INDICATES THEIR TYPE AND THENUMERICAL CODE OF THE ORIGINATING DEPARTMENT. ANY DISTRIBUTION OUTSIDE DTNSRDCMUST BE APPROVED BY THE HEAD OF THE ORIGINATING DEPARTMENT ON A CASE-BY-CASEBASIS.
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