Adjustable Universal Gold Medal Sailing Seat

ADJUSTABLE UNIVERSAL GOLD MEDAL SAILING SEATAndrew SulikTimothy SlatteryMarion Paredes PagesDerek Topper

Detailed Design Review2/8/13, 3:30 pm

Agenda• Meeting Purpose• Overview of Project• Review Customer Needs & Eng. Specifications• Review Decomposition of System• Detailed Design• Test Plan• Review Project Plan• Review Risk Assessment• Conclusions

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Project Goals• Make system comfortable and adjustable to multiple users• Allow enough room for the use of a jib transfer bench• Increase and/or maintain the functionality already

available• Adapt for any C4-5 quadriplegic user such as Richard

Ramos on a 3 person Sonar keel boat that meets all IFDS regulations

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Customer Needs Recap

*1=Most important

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Customer Need #

Importance Level*1 Description Comments/Status

CN1 1 Designed specifically to fit SONAR sailboat CN2 1 Adjustable foot rests CN3 1 Seat Mobility (up/down) CN4 1 Hand crank Adjustability (up/down) CN5 1 Mechanical Advantage 6.4xCN6 1 Corrosion Resistance Powder CoatCN7 1 Seat Locking mechanism (2 Positions around arc) CN8 1 Cost $3,000 CN9 1 Allows space for jib transfer bench

CN10 1 Safe system to operate for long periods 4 years minimumCN11 1 Portable, non-permanent installation no damage to boatsCN12 1 Fits on 1 pallet to ship CN13 1 Emergency quick release for rudder control CN14 1 System Controls Rudder CN15 1 Crank Geometry fits multiple users Product for range of users, ie. Yacht clubCN16 2 System weight CN17 2 Better Functioning 'Fast Pin' system All fast pin locationsCN18 2 Crew Safety CN19 2 Enlarge Track Platform CN20 2 Improved harness CN21 2 Interchangeable seats CN22 3 Grab Handle at top of seat CN23 3 Fit to multiple boats CN24 3 Easy to assemble & install

Engineering Specs Recap

*1 For importance level 1 is must have, 2 is nice to have, 3 is preference only

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EngineeringSpecification #

Importance*1 Source Specification

Unit of Measure Marginal Value Ideal Value Comment/Status

ES1 1 CN1, CN11 Secure to Sonar with non-permanent attachments Binary Yes ES2 1 CN2 Adjustable Foot Rests in 4< ES3 1 CN3 Seat Adjustment (up/down) in 3< ES4 1 CN4 Hand Crank Adjustment in 4<

ES5 1 CN5 Percentage Amplification of User Force Input % 3rev/ 90° Tiller4rev/ 90°

Tiller ES6 1 CN6 Corrosion resistance Binary Yes Material SelectionES7 1 CN7 Seat locks into position anywhere in travel Binary Yes ES8 1 CN8 Cost of components manufactured for MSD $ 3000>

ES9 1 CN9Entire seating system is moved aft from previous iteration in 0< 3<

ES10 1 CN10 Minimum FOS of critical elements found via analysis # 2≤ 3< ES11 1 CN13 Steps required to release rudder in emergency # 3> 1

ES12 1 CN14 Degree of movement of rudder from centerline of boat degrees 40< 90< ES13 1 CN14 Backlash in lines controlling rudder in 1> 0.5> ES14 1 CN15 Distance between hand attachment points in 18±2 18±0.5 ES15 2 CN22 Grab handle(s) to assist seat movement Binary Yes ES16 2 CN17 Time required to attach or detach hands s 30< 15<

ES17 2 CN18 System has limited number of sharp corners or edges # 10> 0 ES18 2 CN19 Pinch points created by track platform # 2> 0 ES19 2 CN20 Steps required to release from harness # 3> 1 ES20 3 CN21 System fits multiple seats # 2<

ES21 2 CN11, CN21Time to fit system in SONAR sailboat minutes 60> 30>

ES22 2 CN11, CN21Time to adjust system for new user minutes 60> 30> ES23 2 CN24 Time to assemble system minutes 60> 30> ES24 1 CN3 Seat Adjusetmenyt (fore/aft) in 3<

Functional Decomposition

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Anthropometry

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Ergonomics & Adjustability

• 95th Percentile Males – 5th Percentile Females• Accommodate 90% of the population

• Backrest• Proper back support• Minimum 10° rearward tilt ✓

• Handles/Hand Grips• Neutral wrist position• Interchangeable for C5 gloves and regular grips• 30° angle

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30°

Adjustability – Detailed Design

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• Considerations:• Distance from shoulders

• Shoulder-forward• Shoulder-down

• Distance from knees• Distance between legs• Rotation effects and distance

3 in

3 in

7 in

3 in

30º

Adjustability – Detail Design

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• Crank Up/Down• Below shoulder• Accommodate user’s

preference

Adjustability – Detailed Design

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• Seat Up/Down• Height• Comfort

• Seat Back/Forth• Distance from crank

• Foot Rests Up/Down• Leg length• Detachable

• Foot Rests Angle• Comfort/Disability

Material Selection• Selection criteria

• Good corrosion resistance• Good strength• Readily available• Easy to weld

• Ideal Material• Aluminum 6061-T6• Yield Strength 40 ksi• Tensile Ultimate 45 ksi• Young’s Modulus 10 ksi

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Fastener Material Selection• Fastener Material

• 316 Stainless Steel• Limited Galvanic Corrosion• Cheap and readily available• Yield Strength 34 ksi• Tensile Ultimate 79 ksi

• Galvanic Corrosion• Reduced by material selection• Reduced by Delrin washers at all bolts

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Seat & Footrest Adjustability

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Hand Crank Adjustability

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States of Loading• Worst Case (P12031)

• 170 lb applied horizontally to hand crank• 150 lb applied downward on collection barrel• 1349 lb impact force applied to end of track

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Detailed Design-Track Platform• Similar to original design – ½” thick

marine fir• Aluminum L-beam (underneath)

adds support to track platform• Added 2 detachable pieces in the

front• Secured using dovetail tabs

• Drilled holes in plates on allow for the adjustment of handle locks

• Rubber plugs are used to eliminate sharp edges and corners on the handle locks

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Track Platform Analysis

Max deflection = 0.1224 in

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Track deflection with load

Max deflection = 0.2960 in

0 10 20 30 40-0.35

-0.3

-0.25

-0.2

-0.15

-0.1

-0.05

0

x(in)

W (i

n)

Beam Deflection

0 10 20 30 40-0.03

-0.02

-0.01

0

0.01

0.02

0.03

x(in)D

W

Beam Slope

0 10 20 30 40-1500

-1000

-500

0

500

1000

1500

x(in)

Mom

ent (

lb*in

)

Beam Bending Moment

0 10 20 30 40-150

-100

-50

0

50

100

150

200

x(in)

She

ar F

orce

(lb)

Beam Shear Force

0 10 20 30 40-4

-3

-2

-1

0

1

2

3

4

x(in)

Nor

mal

Stre

ss T

op (k

Psi

) Beam Maximum Tensile Stress

0 10 20 30 40-4

-3

-2

-1

0

1

2

3

4

x(in)

Nor

mal

Stre

ss B

otto

m (k

Psi

)

Beam Maximum Tensile Stress

Track Platform Analysis

• Stress on bolts during impact of 1349 lb (worst case. From P12031.)• Shear strength = 30000 psi• ¼”-20 aluminum bolts – Stainless Steel bolts to be used

•

•

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Detailed Design-Pedestal Base• Clamping fixture same as

P12031

• Platform extended aft 3 in to accommodate Jib Transfer Bench

• Support Ribs contoured to boat deck

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Detailed Design-Pedestal

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• Swivel plate provides rotation and deceleration

• Pedestal will interface with swivel via welded plate or bolt pattern

• Maximum loading parameters determined by manufacturer

Pedestal Forces• MA=MB=2804.88 lb*in• RB=260 lb

• Specified at 750lb compression (Trendler)

• Specified moment of 9000 lb*in (Trendler)

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13 in

Detailed Design-User Support• Seat support frame from

P12031

• Main support arm fixed to top of swivel plate

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Main Support Arm• δyA = 0.29 in• M = 2804.88 (in*lbs)• σ = 7250.0 psi• σy for 6061-T6 Aluminum

is 45,000 psi.• FOS = 6.2

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δ σ = 𝐹𝑂𝑆=𝜎 𝑦𝜎

Detailed Design-Hand Crank• Centered pulley system

allows individual barrels

• Telescoping tube allows vertical adjustment

• Center pivot allows space for user entry

• Adjustable tensioner allows for easy set up

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Detailed Design-Crank Support Arms• Case 1 (worst case)

• Fa=170 lb• Mb=838.68 lbin/arm• σ=11981.14 psi/arm• σy=45 ksi (6061-T6)• FOS=3.76

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σ = 𝐹𝑂𝑆=𝜎 𝑦𝜎

Detailed Design-Crank Support Arms• Case 2 (normal conditions)

• Fa=20 lb• Mb=98.76 lbin/arm• σ=1409.57 psi/arm• σy=45 ksi (6061-T6)• FOS=31.9

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σ = 𝐹𝑂𝑆=𝜎 𝑦𝜎

Detailed Design-Rotation Pin• Since bearing cannot apply

moment, need pin to lock crank arm into place

• These calculations still need to be completed

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Detailed Design-Hand Crank• Lower pulley axle• Aluminum 6061-T6• Yield strength:45000 psi

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0 1 2 3 4 5 6-6

-5

-4

-3

-2

-1

0x 10

-3

x(in)

W (i

n)

Beam Deflection

0 1 2 3 4 5 6-2

-1

0

1

2

3

4

5x 10

-3

x(in)

DW

Beam Slope

0 1 2 3 4 5 60

20

40

60

80

100

120

x(in)

Mom

ent (

lb*in

)

Beam Bending Moment

0 1 2 3 4 5 6-100

-50

0

50

100

x(in)

She

ar F

orce

(lb)

Beam Shear Force

0 1 2 3 4 5 60

2

4

6

8

10

x(in)

Nor

mal

Stre

ss T

op (k

Psi

)

Beam Maximum Tensile Stress

0 1 2 3 4 5 6-10

-8

-6

-4

-2

0

x(in)

Nor

mal

Stre

ss B

otto

m (k

Psi

)

Beam Maximum Tensile Stress

Detailed Design-Hand Crank• Upper pulley axle• Same properties as before

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Hand Crank Fatigue• From quadsailor.com, we found evidence of 3 hour trips• Assuming a 5 month season, 1 tack every 5 minutes, and

4 cranks per tack we get 8460 rev/season• Based on a life of 8 years you get a lifetime use of 69,120

revolutions• Due to this low number, fatigue analysis on these axles is

unnecessary

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Hand Crank Gearing• Goal: 4 cranks for 90 degree tiller movement• Want to keep 4” load pulley• Based on current system, where 3 cranks give 90 degree

tiller movement, we have a 1.25 pulley ratio• To get 4 cranks, need pulley ratio of 0.9375• Requires 3.75” drive pulley – Not Readily Available• Using 1 pulley ratio need 3.75 cranks for 90 degree tiller

movement

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Hand Crank Gearing• Options for gearing

1. Keep current gear ratio with 3 cranks per 90 degree tiller rotation

2. Use decreased gear ratio with 3.75 cranks per 90 degree tiller rotation

• Options to be given to Richard Ramos

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Detailed Design-Hand Crank Grips• System designed to mimic

C5 grips

• Detent pin to keep hands in place

• Detent pin axial pull out force needs to be acquired

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Bearing Specifications

Max Dynamic Load

2110 Lb

Max Static Load

966 Lb

Max Axial Load

966 Lb

• Sealed bearings to last in elements

• Able to withstand larger loads than applied

• Cheap to replace if needed

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Tiller Strut• Same structure as P12031• Hasp fitting connection

removed• Replaced with clamp• Clamp geometry has not

been determined

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Emergency Tiller Release• Cam cleat concept has not

been fully developed

• Requires testing of cam cleats (on Skip’s boat)

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Preliminary Test Plan

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• MSDII Test Plan

• See Excel Spread Sheet

Project Plan• MSDI final Project Plan

• See .pdf Files

• https://edge.rit.edu/edge/P13032/public/WorkingDocuments/Project%20Information/General%20Information/Project%20Plan%20/Project%20Plan%20MDSI%201_4.pdf

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Risk Assessment• Overall assessment of risks

• See Excel Spreadsheet

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Questions?

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