New PDF release: Accelerated testing : statistical models, test plans and

By Wayne B. Nelson

ISBN-10: 0470316799

ISBN-13: 9780470316795

ISBN-10: 0470317477

ISBN-13: 9780470317471

Sped up trying out Statistical types, attempt Plans, and knowledge Analyses; Contents; Preface; 1. advent and historical past; 2. versions for all times assessments with consistent pressure; three. Graphical info research; four. whole facts and Least Squares Analyses; five. Censored facts and greatest Ukelihood equipment; 6. try out Plans; 7. Competing Failure Modes and dimension influence; eight. Least-Squares Comparisons for whole information; nine. greatest probability Comparisons for Censored and different information; 10. versions and information Analyses for Step and ranging pressure; eleven. sped up Degradation; Appendix A. Statistical Tables; References; Index

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Additional resources for Accelerated testing : statistical models, test plans and data analyses

Sample text

Sometimes one knows only whether the failure time of a unit is before or after a certain time. Each observation is either censored on the right or else on the left. Such life data arise if each unit is inspected once to see if it has already failed or not. Such inspection data are called quantal-response data, also called sensitivity, probit, binary, and allor-nothing response data. 1G depicts such a sample. There the arrow for each unit shows whether the unit failed before its inspection or will fail later.

There is little established theory (Chapter 10) for using constant stress data to estimate life under varying stress. Then constant-stress testing must be regarded as an index test. That is, a product that performs well under constant stress is assumed to perform well under varying stress. Best and worst life distributions for such a product can be obtained from a constant-stress model. Use the model with the lowest and highest stress levels that the product sees. Even this contains implicit assumptions.

The A-ratio for ac voltage cycling of insulation is infinity, since the mean voltage is zero. Usually, on a fatigue test, all specimens see the same A-ratio as does an actual part in use, but different groups of specimens run at different mean stress levels. Such a test is then regarded as a constant stress test. 1 where the vertical axis shows the mean stress. Moreover, then specimen life is modeled with a constant stress model, and the data are analyzed accordingly. Assumed. In most such tests, the frequency and length of a stress cycle are the same as in actual product use.

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Accelerated testing : statistical models, test plans and data analyses by Wayne B. Nelson

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