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Design Reliability

Design Reliability. Dein Shaw PME, Tsing Hua University. Chapter 1 Introduction. 1.1 Reliability history German V1, V2 rocket World war II Electronic tube Aeronautic radio, Inc, 1947 ……. 1.2 Need of reliability in product design

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Design Reliability

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  1. Design Reliability Dein Shaw PME, Tsing Hua University

  2. Chapter 1 Introduction 1.1 Reliability history • German V1, V2 rocket World war II • Electronic tube Aeronautic radio, Inc, 1947 • …….

  3. 1.2 Need of reliability in product design • Huge amount of the parts are used for a complicate system. eg. $1 for design stage $ 10 after final release $100 at prototype $1000 at pre-production stage $10000 at production stage Design relate problems are greatest causes for product failure. 43% due t design, 30% operation and maintenance, 20% manufacturing, 7% miscellaneous factors

  4. Reliability in the product design process Reliability tasks: • Establishing reliability requirements definition • Using reliability design standards/guides/checklist • Allocation reliability • Predicting reliability • Reliability modeling • Monitoring subcontractor/supplier reliability activities • Performing failure modes effects and criticality analysis • Monitoring reliability growth • Accessing software reliability • Environmental stress screening • Preparing critical items list • Performing electronic parts/circuits tolerance analysis

  5. Reliability specialized and application areas • Mechanical reliability • Software reliability • Human reliability • Reliability optimization • Reliability growth • Structural reliability • Reliability general • Power system reliability • Robot reliability and safety • Life cycle coasting • Maintainability

  6. Term and definition • Reliability • Failure • Maintainability • Redundancy • Active redundancy • Availability • Mean time to failure (exponential distribution) • Useful life • Mission time • Human error • Human reliability

  7. 1.3 Pattern of Failure 1.3.1 component failure

  8. Example 1.1 automobile break (measured in miles of successful operation)

  9. Show relative frequency diagram:

  10. As will shown later, the standard deviation indicates a measure of the spread out of the life of break.

  11. 1.4 Factor of Safety and reliability S=150k(lb/in2), L=75k(lb/in2)

  12. Problem: Find the U.S. military standard which are relate to reliability.

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