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Function Decomposition

Function Decomposition. from David Ullman, The Mechanical Design Process , 1997. Function, “ what the product must do” can be described as logical flow of energy, material and information Step 1: Find the Overall Function Step 2: Create Sub-Function Description

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Function Decomposition

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  1. Function Decomposition from David Ullman, The Mechanical Design Process, 1997. • Function, “ what the product must do” can be described as logical flow of energy, material and information • Step 1: Find the Overall Function • Step 2: Create Sub-Function Description • Step 3: Order the Sub-Functions • Step 4: Refine Sub-Functions

  2. Function Decomposition • Step 1: Find the Overall Function • Black Box: Input, output, other resources • Energy & material must be conserved. • All interfacing objects must be identified. • When adding information flows, ask “how will I know if it is performing?”

  3. Function Decomposition • Step 1: Find the Overall Function • Black Box: Input, output, other resources • Energy & material must be conserved. • All interfacing objects must be identified. • When adding information flows, ask “how will I know if it is performing?”

  4. Function Decomposition • Step 2: Create Sub-Function Description • Action Verb + Objects + Modifier 무엇을 (명사) 어떻게한다 (능동적 동사) + 수식어 (상세내용) • What, not how. • Break the function down as finely as possible • List all alternative functions • Preparation, use and conclusion • Ex) Product dissection to find sub-functions

  5. Function Decomposition • Step 2: Create Sub-Function Description • Action Verb + Objects + Modifier 무엇을 (명사) 어떻게한다 (능동적 동사) + 수식어 (상세내용) • What, not how. • Break the function down as finely as possible • List all alternative functions • Preparation, use and conclusion • Ex) Product dissection to find sub-functions

  6. Function Decomposition • Step 3: Order the Sub-Functions • Logical manner, time sequence: Block Diagram • Redundant ones identified and combined • Different sub-functional options left as options • Eliminate outside ones

  7. Function Decomposition • Step 3: Order the Sub-Functions • Logical manner, time sequence: Block Diagram • Redundant ones identified and combined • Different sub-functional options left as options • Eliminate outside ones

  8. Function Decomposition • Step 4: Refine Sub-Functions • Decomposition continues until “atomic” functions are developed. • Atomic function: the one fulfilled by existing objects.

  9. Function Decomposition • Step 4: Refine Sub-Functions • Decomposition continues until “atomic” functions are developed. • Atomic function: the one fulfilled by existing objects.

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