design reliability
Post on 30-Dec-2015
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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
• 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 stageDesign relate problems are greatest causes for pro
duct failure. 43% due t design, 30% operation and maintenance, 20% manufacturing, 7% miscellaneous factors
Reliability in the product design process
Reliability tasks:1. Establishing reliability requirements definition2. Using reliability design standards/guides/checklist3. Allocation reliability4. Predicting reliability5. Reliability modeling6. Monitoring subcontractor/supplier reliability activities7. Performing failure modes effects and criticality analysis8. Monitoring reliability growth9. Accessing software reliability10. Environmental stress screening11. Preparing critical items list12. Performing electronic parts/circuits tolerance analysis
Reliability specialized and application areas
1. Mechanical reliability2. Software reliability3. Human reliability4. Reliability optimization5. Reliability growth6. Structural reliability7. Reliability general8. Power system reliability9. Robot reliability and safety10. Life cycle coasting11. Maintainability
Term and definition
1. Reliability2. Failure3. Maintainability4. Redundancy5. Active redundancy6. Availability7. Mean time to failure (exponential distribution)8. Useful life9. Mission time10. Human error11. Human reliability
As will shown later, the standard deviation indicates a measure of the spread out of the life of break.
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