ME2110. Conceptual Design

Transcription

1 ME2110 Conceptual Design

2 Key Concepts Structured Concept Generation processes Functional Decomposition Solution Principle Matrices Morphological Charts Objective Concept Evaluation GIT 2

3 PRODUCT LIFECYCLE 2. Phases of Design Start End A. Customer/Product Requirements B. Design Specification C. Conceptual Design I. Concept Generation II. Concept Evaluation D. Detail Design E. Prototyping F. Design Finalization I. Specification for Production Manufacturing Usable Life End of Life Concurrent NOT Linear GIT 3

4 4. DT2 House of Quality Primary design tool in QFD Ensures comprehensive understanding of design task and product requirements Builds on P.U.F by adding rooms for: Design Trade-off & Analysis Identification Design Target Specification Customer Competitive Assessment Technical Competitive Assessment Identifies key design requirements for product non-subjectively GIT 4

5 5. HoQ Detailed Example Product: Car door Customer requirements? GIT 5

6 5. HoQ Detailed Example Product: Car door GIT 6

7 Competitive Assessment & Customer Rating GIT 7

8 Key Concepts Structured Concept Generation processes Functional Decomposition Solution Principle Matrices Morphological Charts Objective Concept Evaluation GIT 8

9 3.Function Decomposition E Dough Additives I Shape Dough E loss Shaped Dough Dough Feed in 1 Prepare 2 Dispense 3 Shape 4 Separate 5 Feed Out 6 Shaped Dough Return 7 Additives Waste Waste Waste GIT 9

10 4. Solution Principle Matrix Example: Design of a Pencil Sub-function 1: Make an Erasable Mark Sub-function 2: Erase an Erasable Mark Subfunc Idea: (Mechanical) Rub on Material Solution Principles (Idea/Source) (Mechanical) Squirt Material (Mechanical) PlaceMaterial (like Letterset) (Chemical) Changepaper composition Source: Standard product Team#2 Letterset Acid etching (Chemical) Changepaper color (like Litmus paper) (Electrical) Burn paper (spark) (likeold fashioned strip chart recorders) (Electrical) Electrify Paper (glow discharge) (Electrical) Static charge tohold mark on (like Etch-A-Sketch) Fisher Scientific Team#3 Team#1 Etch-A-Sketch (Thermal) Burn paper (flame) (Thermal) Heat paper (glowdischarge) (Thermal) Melt on Mark (Magnetic) Attach magnetic material (likerefrigerator magnets) Team#2 Team#2 Wax seals Gift Store (Biological) Growbacteria, fungus (Biological) Modify (digest?)paper (Optical) Changelight properties of paper (reflectance, polarity) (Optical) Change light (hologram) Team#2 BioTech Magazine Team#2 Team#2 (Mechanical) Rub off Material (Mechanical) Take off material (Mechanical) Cover mark (like white out) (Chemical) Changepaper composition Standard product Team#2 Team#1 Team#2 (Chemical) Changepaper color (likedyingfabric the same color as a stain) GIT (Chemical) Change mark (e.g., bleach) (Electrical) Burn off mark (spark) Team#1 Team#2 Team#2 ETC. 10

11 4. Combining Solution Principles Sub- Functions \Solutions 1 2 j m 1 F 1 S 11 S 12 S 1j S 1m 2 F 2 S 21 S 22 S 2j S 2m i F i S i2 S ij S im n F n S n1 S n2 S nj S nm 1 2 Combination of Principles Combination 1: S 11 + S S n1 Combination 1: S 11 + S S n2 GIT ME 2110: Creative Decisions and 11

12 Start Line 4. Example : A Simple Competition Objective: Place mass from Start line and place on target 20 ft 12.5 ft 6.25 ft 12

13 4. DT6 Example : A Simple Competition Start with a Function Tree Place Mass on Target Generate Power Transmit Power Hit Target Brake on Target Move Mass Navigate to Target 13

14 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... Rolling Sliding Projectile Launch Equal Size Wheels Larger Front Wheels

15 5. DT-6 Morph Chart Example Concept 1: Gravity+Ramp+Friction Brake Concept 2: Mousetrap+Rip Cord+String Brake Concept 3: Gravity+Mousetrap+Friction Brake Store/ Acquire Power Gravity Mouse Traps Transmit Power Brake on Target Move Mass Navigate to Target Car Hit by Trap Rip Cord Effect Ramp Catapult Rolling Friction String Break Anchor Rubber Stopper... Rolling Sliding Projectile Launch Equal Size Wheels Larger Front Wheels 15

16 6. Concept Evaluation Intro Example THE BIG EGG-HUNT ME 2110: Creative Decisions and Design

17 6. Concept Evaluation Intro Example The Egg Basket Central Nest ME 2110: Creative Decisions and Design 17

18 6. Concept Evaluation Intro Example 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. ME 2110: Creative Decisions and Design 18

19 6. DT8 Evaluation Matrices Concept Criteria A B C D E F + - S D A T U M + = better than datum; - = worse than datum; S = same as datum ME 2110: Creative Decisions and Design

20 6. DT8 1 st Level Evaluation Matrices Concept Criteria Cost Safety Gathering Ability Robustness Bunny Snake Voodoo Spell D A T U S _ + S Ease of M S _ Assembly s = better than datum; - = worse than datum; S = same as datum _ _

21 6. DT8 Evaluation Scales 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 21

22 6. DT8 2 nd Level Evaluation Matrices Concept Criteria A: low material cost B: easy of assembly C: short testing time D: simple construction E: functional safety F: simple operation Total Relative = Total/

23 6. DT8 3 rd Level Evaluation Matrices WEIGHT (0-4) C1 (RUB ON - RUB OFF) C2 (PLACE ON - TAKE OFF) WORKING PRINCIPLE: MAKES ERASABLE MARK REMOVES ERASABLE MARK EMBODIMENT: HOLDS POINT PRODUCTION: FEW PARTS SIMPLE TO MAKE ASSEMBLY: EASY 3 3 OPERATION: COMFORTABLE TO USE LOW USE FORCE C3 (PLACE ON - RUB OFF) MAINTENANCE: SHARPENABLE SAFETY: DOESN T HARM USER BY BREAKING INTO SMALL, HARMFUL PARTS NOT POISONOUS TOTAL POINTS: 23

24 Conceptual Design Summary 1. Formulate Many Alternate Concepts DT5 Functional Decomposition DT6 S.P.M 2. Evaluate Concepts DT5 Evaluation Matrices DT7 Morph. Chart 3. Select Concepts for Further Refinement ME 2110: Creative Decisions and Design 24