| QG5: Functional Diagramming |
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CPD&M focuses on the Functions that a technology, product or manufacturing process must perform.
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CPD&M Focuses on Functions
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The Function Tree:
 | | Function Tree |
Once a Function Tree is fully illustrated and the NUD Functions highlighted, as a team, construct a detailed Functional Flow Diagram listing the serial-parallel flow of the functions over time.
 | | Function Tree is basis for Functional Flow Diagram |
The Functional Flow Diagram and the Function Tree serve two useful purposes: - They are essential to constructing a coherent Design Guide so people understand how the design works, and
- They set the stage for generating base-line Parameter Diagrams for Modeling and Simulation and Designed Experimentation (DOEs).
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QG6: Functions, Complexity & Risk
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CPD&M focuses on the Functions that a technology, product or manufacturing process must perform to fulfill its requirements. The following diagram describes a Function through the parametric variables that enable it to occur based upon physical law.
 | | The Ideal Function |
The diagram below illustrates a rule-of-thumb we use in CPD&M: Risk increases as one moves from:
- static parts (items that do not move much on a micro-deflection basis or move very little relative to other parts in a macro-displacement context; no or extremely small mass-energy transfer or transformation, negligible "work" is measurable at this level of a product)
- to parts and materials that are integrated into functioning sub-assemblies that have some form of internal dynamics (some form of mass-energy transfer or transformation we can classify and measure as "work")
- to integrated parts and sub-assemblies into functioning sub-systems that have additional, more complex forms of internal and across sub-assembly dynamics (more complex forms of mass-energy transfer or transformation we can classify and measure as "work")
- to integrated parts, sub-assemblies and sub-systems that form a functioning system that has very high complexity within and across the functioning system. (the most complex forms of mass-energy transfer or transformation we can classify and measure as "work")
 | | NUD vs. ECO Development Risk |
Critical parameter development identifies a hierarchy of functions and associated risk due to NUD designations. Once NUD Functions are identified, Design Failure Modes & Effects Analysis (DFMEA) is conducted.
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| Links to Prior CPD&M Quick Guide Newsletter Issues |
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Below are links to each of the prior newsletters with CPD&M Quick Guides:
The CPD&M Quick Guide TOC (Nov 2013)
CPD&M QG1&2: Intro & Process (Jan 2014)
QG3&4: Prioritize Req'ts & Design Guide (Feb 2014)
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Is there a topic you'd like us to write about? Have a question? We appreciate your feedback and suggestions! Simply "reply-to" this email. Thank you!
Sincerely,
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Carol Biesemeyer
Business Manager and Newsletter Editor Product Development Systems & Solutions Inc. |
