Concept Organization I.pptx - This is a design concept This is a design concept The conceptual design process • • • • Stage(I concept ideation

Concept Organization I.pptx - This is a design concept This...

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This is a design concept!
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This is a design concept!
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The conceptual design process Stage (I): concept ideation Stage (II): concept organization Stage (III): concept selection Stage (IV): concept improvement
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Is it a good idea to kill two birds with one stone?
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Can one person shoot 4 arrows at the same time and all hit the same target? Can one person shoot 4 arrows in a sequence and all hit the same target? Can 4 people shoot 4 arrows independently and hit 4 different targets?
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Organization by “functional dependency” Functional dependency (coupling, complexity) is a good criteria to objectively evaluate design concepts when parametric values are still unknown The functional dependency can be quantitatively determined by how the synthetic propositions were made between FR-DP domain during the concept formation step above The functional dependency between FR and DP domains is a good measure of the complexity of logically feasible concepts Those concepts which have a higher degree of “functional dependencies” are always more complex than others Axiom 1 from the Axiomatic Design Theory provides a good theoretical foundation for evaluating the functional dependency at the concept organization step
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Axiomatic Design Theory by N.P. Suh An axiom is a fundamental statement which cannot be proven, but is assumed to be valid as long as there are no exceptions or counter-examples (descriptively derived prescriptively apply) The ideality adopted in developing the AD theory is… The best (or most ideal) design is the simplest design; and functionally independent designs are the simplest (hence the best) design The Axiomatic Design ( AD ) theory by N. P. Suh has: An expanded design framework based on the synthesis theory A specific (synthesis) process of generating new design concepts Two domain-independent axioms for evaluation of design concepts
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Use Axioms to achieve design ideality All design theories must have an underline design ideality The AD ideality: “the simplest design is the most ideal design” Or the designer should create/select the least complex design AD suggests 2 design axioms to sequentially compare and select the least complex design (to achieve design ideality) Axiom1 : reduce the functional dependencies Independence Axiom: maintain independence of all chosen FRs To begin with, choose FRs that are independent of each other » i.e., each WHAT can be independently satisfied by its own means Next, when map FRs to DPs (or from DPs to PVs), try as much as you can to maintain the independence of those chosen FRs » i.e., each WHAT should be independently satisfied by its HOWs Axiom 2 : minimize the physical uncertainties Information Axiom: among those design concepts above, select the one that has the (estimated) minimal information content!
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