2010-Engineering_Design-6-2

2010-Engineering_Design-6-2 - 1 Axiomatic Design:...

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1 Computational Solid Mechanics and Design Lab. Ex) Faucet Design FR 1 = Control flow rate(Q). FR 2 = Control temperature(T). Axiomatic Design: Independence Axiom
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2 Computational Solid Mechanics and Design Lab. • In a coupled design, the desired changes to an FR cannot be achieved without affecting other FRs. 1 2 Q X X T X X f ì ü ì ü é ù = í ý í ý ê ú î þ ë û î þ Axiomatic Design: Independence Axiom
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3 Computational Solid Mechanics and Design Lab. • In an uncoupled design, each DP affects a unique FR. 0 0 Q X T X Y f ì ü é ù ì ü = í ý í ý ê ú î þ ë û î þ Axiomatic Design: Independence Axiom
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4 Computational Solid Mechanics and Design Lab. 1 1 1 1 2 3 1 1 2 2 2 2 2 1 2 3 3 3 3 3 3 1 2 3 FR FR FR DP DP DP FR DP FR FR FR FR DP DP DP DP FR DP FR FR FR DP DP DP d é ù ê ú ê ú ì ü ì ü ê ú ï ï ï ï = ê ú í ý í ý ê ú ï ï ï ï î þ î þ ê ú ê ú ê ú ë û 1 1 2 2 3 3 Is this an uncoupled design? where FR X x x DP FR x X x DP FR x x X DP X x æ ö æ ö é ù ç ÷ ç ÷ ê ú = ç ÷ ç ÷ ê ú ç ÷ ç ÷ ê ú ë û è ø è ø >> Axiomatic Design: Independence Axiom When a coupled design cannot be avoided, there should be an alternative way. Sensitivity Analysis is needed.
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5 Computational Solid Mechanics and Design Lab. Axiomatic Design: Physical Integration Ex) Can and Bottle Opener FR 1 = Open a can. FR 2 = Open a bottle. It seems that we have one DP. Actually, we have two DPs which are integrated in one object.
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6 Computational Solid Mechanics and Design Lab. Ex) Can and Bottle Opener Design Equation When multiple DPs are integrated in one DP, complexity is reduced and possibility of information reduction is increased. Therefore, physical integration is recommended. 1 1 2 2 0 0 FR DP X FR DP X ì ü ì ü é ù = í ý í ý ê ú ë û î þ î þ Axiomatic Design: Physical Integration
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7 Computational Solid Mechanics and Design Lab. Ex) Beverage Can 12 FRs and 12 DPs: DPs are integrated in one object. Axiomatic Design: Physical Integration
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8 Computational Solid Mechanics and Design Lab. Axiomatic Design: example
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9 Computational Solid Mechanics and Design Lab. YOU CANNOT OPTIMIZE A BAD DESIGN ! ü N.P. SUH Axiomatic design workshop for faculty 1998, MIT, Boston Axiomatic Design
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10 Computational Solid Mechanics and Design Lab. Axiomatic Design: Theorems Theorem 1 Coupling Due to Insufficient Number of DPs Theorem 2 Decoupling of Coupled Design Theorem 3 Redundant Design Theorem 4 Ideal Design Theorem 5 Need for New Design Theorem 6 Path Independence of Uncoupled Design Theorem 7 Path Dependence of Coupled and Decoupled Designs Theorem 8 Design for Manufacturability Theorem 9 Independence and Tolerance
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2010-Engineering_Design-6-2 - 1 Axiomatic Design:...

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