ME2110 Module 7 : Conceptual Designsinghose.marc.gatech.edu/courses/me2110 Spring11b... · 2011. 5. 26. · B. Design Specification Target Performance Metrics, Design Constraints

ME2110

Module 7 :

Conceptual Design

© GIT2

Key Concepts

• Structured Concept Generation processes

• Functional Decomposition

• Solution Principle Matrices

• Morphological Charts

• Objective Concept Evaluation

Outline

© GIT3

1. Review Design Tools CoveredPUF and HoQ

2. Concept GenerationWhat is structured concept generation?

3. Design Tool 5 – Functional Decomposition

4. Design Tool 6 – Solution Principle Matrix

5. Design Tool 7 – Morphological Chart

6. Concept EvaluationWhat is structured concept generation?

7. Design Tool 8 – Evaluation Matrices

1. Design Tools to-date

© GIT4

A. Customer/Product RequirementsProblem understanding, Initial Analysis

B. Design SpecificationTarget Performance Metrics, Design Constraints

C. Conceptual Design

I. Concept Generation

II. Concept Evaluation

D. Detail Design

E. Prototyping

F. Design Finalization

I. Specification for Production

DT1 – P.U.F DT2 – H.o.Q

DT4 – Design Spec. Sheet

DT3 – Function tree

DT5 – Functional

Decomposition

DT6 – S.P.M DT7 – Morph. Chart

DT5 – Evaluation Matrices

2. Concept Generation

© GIT5

• Systematic identification of design alternatives

• Many alternatives

• Synthesis of concepts from function-level design

solutions (How’s)

What is Concept Generation

Design Tools

• DT5 – Functional Decomposition

• DT6 – Solution Principles Matrix

• DT7 – Morphological Chart

• DT8 – Evaluation Matrices

6

3. DT5 – Function Decomposition

1 2 3 54 6

7

1 2 3+4 5 6

7

Feed in

1

Prepare

2

Dispense

3

Shape

4

Separate

5

Feed Out

6

Return

7

Dough Shaped

Dough

Waste Waste WasteAdditives

1 2 3+4+5 6

7

1 2+3 4+5 6

7

Shape DoughShaped Dough

ElossDough

AdditivesI

E

© GIT

7

4. DT6 - Solution Principle Matrix

Sub-func.

Solution Principles(Idea/Source)

1

Idea:(Mechanical)RubonMaterial

(Mechanical)Squirt Material

(Mechanical)PlaceMaterial(likeLetterset)

(Chemical)Changepaper composition

Source:Standardproduct Team#2 Letterset Acidetching

1

1

(Chemical)Changepaper color(likeLitmuspaper)

(Electrical)Burnpaper (spark)

(likeoldfashionedstripchart recorders)

(Electrical)ElectrifyPaper (glow

discharge)

(Electrical)Staticchargetoholdmark

on(likeEtch-A-Sketch)

Fisher Scientific Team#3 Team#1 Etch-A-Sketch

1

(Thermal)Burnpaper (flame)

(Thermal)Heat paper (glowdischarge)

(Thermal)Melt onMark

(Magnetic)Attachmagneticmaterial(likerefrigerator magnets)

Team#2 Team#2 Waxseals Gift Store

2

(Biological)Growbacteria, fungus

(Biological)Modify(digest?)paper

(Optical)Changelight propertiesof

paper (reflectance, polarity)

(Optical)Changelight (hologram)

Team#2 BioTechMagazine Team#2 Team#2

2

(Mechanical)Ruboff Material

(Mechanical)Takeoff material

(Mechanical)Cover mark

(likewhiteout)

(Chemical)Changepaper composition

Standardproduct Team#2 Team#1 Team#2

(Chemical)Changepaper color

(likedyingfabricthesamecolor asastain)

(Chemical)Changemark(e.g., bleach)

(Electrical)Burnoff mark (spark)

ETC.

Team#1 Team#2 Team#2

Example: Design of a “Pencil” Sub-function 1: Make an Erasable Mark

Sub-function 2: Erase an Erasable Mark

© GIT

ME 2110: Creative Decisions and

Design

8

4. Combining Solution Principles

Sub-

Functions

\Solutions1 2 j m

1 F1 S11 S12 S1j S1m

2 F2 S21 S22 S2j S2m

i Fi Si2 Sij Sim

n Fn Sn1 Sn2 Snj Snm

Combination of Principles1 2

Combination 1: S11 + S21 + … + Sn1

Combination 1: S11 + S22 + … + Sn2

© GIT

9

4. DT6 Example : A Simple Competition

20 ft

Sta

rt L

ine

6.25 ft

12.5 ft

Objective:

Place mass from Start line and place on target

10

Place Mass

on Target

Move

Mass

Navigate

to

Target

Brake on

Target

Generate

Power

Transmit

Power

Hit

Target


Start with a Function Tree

11

Different working principles to satisfy the function “store energy” by varying the type of

energy.

1

2

3

4

5

6

Mechanical Hydraulic Electrical Thermal

Flowing

Liquid

Heated

Liquid

Superheated

Steam

Type of Energy

Working Principle

Battery

Inductance, L

Pot.

Energ

y

mh

Hydraulic

reservoire.g, Piston

Moving

Massm

v

Mass

M, s, T

Flywheelw

J

+V-

J

vw Wheel

on

inclin

e

Plane

Liquid

Res.

Pot. E.h

F

Spring Other Springs

Comp. Gas

F


12

5. DT-6 The Morphological Chart

Going from concept to physical reality

.........

Store/

Acquire

Power

Transmit

Power

Brake on

Target

Move

Mass

Navigate

to Target

Gravity Mouse Traps

Car Hit by Trap Rip Cord Effect Ramp Catapult

Rolling Friction String Break Anchor Rubber Stopper

Equal Size Wheels Larger Front Wheels

Rolling Sliding Projectile Launch

...

13

Concept 1: Gravity+Ramp+Friction BrakeConcept 2: Mousetrap+Rip Cord+String BrakeConcept 3: Gravity+Mousetrap+Friction Brake

Store/

Acquire

Power

Transmit

Power

Brake on

Target

Move

Mass

Navigate

to Target

Gravity Mouse Traps

Car Hit by Trap Rip Cord Effect Ramp Catapult

Rolling Friction String Break Anchor Rubber Stopper

Equal Size Wheels Larger Front Wheels

Rolling Sliding Projectile Launch

...

5. DT-6 Morph Chart Example

Outline

© GIT14

1. Review Design Tools CoveredPUF and HoQ

2. Concept GenerationWhat is structured concept generation?

3. Design Tool 5 – Functional Decomposition

4. Design Tool 6 – Solution Principle Matrix

5. Design Tool 7 – Morphological Chart

6. Concept EvaluationWhat is structured concept generation?

7. Design Tool 8 – Evaluation Matrices


Design

THE BIG EGG-HUNT

6. Concept Evaluation Intro Example


Design 16

The Egg Basket

Central Nest



Design 17

A) Each rotten egg in your zone is -3 points

B) Each regular egg (from the middle level of

the nest)in your zone is 1 pt.

C) Each Big Egg (from the top level of the

nest) in your zone is 3 pts.

D) All eggs in your basket are valued at 3X

the above values.



Design

Concept 1 2 3 4 5

Criteria

A D

B A

C T

D U

E M

F

+

-

S

+ = better than datum; - = worse than datum; S = same as datum

6. DT8 – Evaluation Matrices

19

+ = better than datum; - = worse than datum; S = same as datum

Concept

Criteria

Cost

GatheringAbility

Safety

Robustness

Ease ofAssembly

+-

s

1 2 3 4 5

Bunny

D

A

T

U

M

Snake

+

S

S

S

_

1

1

3

_

_

+

+

+

3

2

0

_

_

+

+

+

3

2

0

VoodooSpell

_

_

_

+

+

2

3

0

6. DT8 – 1st Level Evaluation Matrices

20

Pts. Meaning

0 unsatisfactory

1 just tolerable

2 adequate

3 good

4 very good (ideal)

Pts. Meaning

0 absolutely useless

solution

1 very inadequate

solution

2 weak solution

3 tolerable solution

4 adequate solution

5 satisfactory solution

6 good solution with few

drawbacks

7 good solution

8 very good solution

9 solution exceeding

the requirement

10 ideal solution

6. DT8 – Evaluation Scales

21

Concept 1 2 3 4 5

Criteria

A: lowmaterialcost

3 1 4 4 3

B: easyassembly

3 4 4 4 3

C: shorttesting time

4 1 3 4 4

D: simpleconstruction

2 3 4 3 3

E:functionalsafety

2 2 2 2 2

F: simpleoperation

3 3 3 3 2

Total 17 14 20 20 17

Relative =Total/24

0.71 0.58 0.83 0.83 0.71

6. DT8 – 2nd Level Evaluation Matrices


Design

22

WEIGHT

(0-4)

C1

(RUB ON

- RUB

OFF)

C2

(PLACE

ON -

TAKE

OFF)

C3

(PLACE

ON - RUB

OFF)

WORKING PRINCIPLE:

MAKES ERASABLE

MARK

4 4 4

REMOVES

ERASABLE MARK

4 3 3

EMBODIMENT:

HOLDS POINT 3 2 4

PRODUCTION:

FEW PARTS 4 3 2

SIMPLE TO MAKE 4 2 2

ASSEMBLY:

EASY 3 3

OPERATION:

COMFORTABLE TO

USE

2 2 3

LOW USE FORCE 3 3 4

MAINTENANCE:

SHARPENABLE 4 4 4

SAFETY:

DOESN’T HARM

USER BY

BREAKING INTO

SMALL, HARMFUL

PARTS

4 3 4

NOT POISONOUS 0 4 3

TOTAL POINTS:

6. DT8 – 3rd Level Evaluation Matrices


Design 23

1. Formulate Many Alternate

Concepts

2. Evaluate Concepts

3. Select Concepts for Further

Refinement

Conceptual Design Summary

DT5 – Functional

Decomposition

DT6 – S.P.M DT7 – Morph. Chart

DT5 – Evaluation Matrices

ME2110 Module 7 : Conceptual Designsinghose.marc.gatech.edu/courses/me2110 Spring11b... · 2011. 5. 26. · B. Design Specification Target Performance Metrics, Design Constraints

Documents