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MAE486_Fall11_L4_S

MAE486_Fall11_L4_S - MAE 486 Design of Mechanical Systems...

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Unformatted text preview: MAE 486 Design of Mechanical Systems Lecture 4 Fall 2011 Today s topics: Problem Definition (Chapter 3); •  Identify Customer Needs; •  Establishing Engineering Characteristics; •  Benchmarking Test; Review: Design Review •  •  •  •  •  A retrospective study; Who should be included in the review team? What should be reviewed? What do we look at in reviews? What is the review outcome? Review: Redesign •  What is redesign? •  Examples: Review: Problem Defini?on & Iden?fying Customer Needs •  Design process = A filtering process; •  Problem defini?on: –  Most important step in PDP; –  What is the focus? •  Customer = End user? •  Preliminary research on needs: –  What are the methods we can apply? •  How to get inputs from customers? •  How to Create Customer Survey? •  How to evaluate surveys? Review: Ethnographic Studies & Customer Requirements •  •  •  •  What is ethnography? And what is used for in design? Maslow’s hierarchy of human needs Garvin’s Eight Basic Dimensions of Quality How to categorize and priori?ze? –  Expecters; Spokens; Unspokens; Exciters; •  Kano Diagram: •  Results: A more accurately priori?zed list; •  CTQ CRs: Establishing Engineering Characteris?cs •  Goal: •  What are the engineering characteris?cs? Benchmarking in General •  Why do benchmarking? •  Xerox example: –  Problem: –  Benchmarking targets: –  Results; •  Be aware of the resistance to benchmarking. •  How to overcome the barriers? Compe??ve Performance Benchmarking •  What should be benchmarked? •  What are the steps involved? Reverse Engineering •  What is it? •  How is it u?lized in design? •  How to do it in design? •  What are the keys in the process? Determine Engineering Characteris?cs •  Ecs: Customer needs  Engineering Characteris?cs (Ecs); •  Exercise: What are the ECs for car jack? Quality Func?on Development (QFD) •  What is it? •  What do we want to get out of it? •  Graphical method; •  How will it help the design team? A bit of history of QFD: •  QFD Tool: House of Quality (HOQ) •  Many different formats; •  Key for us: Understand the basics; •  Key components: –  –  –  –  Room 4: CRs Ecs Room 5: What are other rooms for? •  Structure: –  Horizontally: –  Ver?cally: •  End Result: •  Develop HOQ  How to Build a HOQ? •  The streamlined HOQ (Basic Version) •  Step 1: Construct RM1. •  Step 2: Construct RM2. How to Build a HOQ? •  Step 3: Construct Room 4 (Rela?on Matrix); How to Build a HOQ? •  Step 3: Construct Room 4 (Rela?on Matrix)—Code Scheme; How to Build a HOQ? •  Step 4: Construct Room 5 (Importance Ranking) Understanding Rela?onship Matrix •  An empty row •  An empty Column; •  A row W/O “9” assigned; •  A Column W. many #s; •  Diagonal matrix; Outcome of HOQ •  Clarify of the importance of ECs; •  Help to allocate resources; ...
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