Download Accelerated Testing: Statistical Models, Test Plans, and by Wayne B. Nelson PDF

By Wayne B. Nelson

This is often unquestionably the easiest publication in quantitative sped up lifestyles trying out. Dr.Nelson does a great task in in actual fact explaining the statistical versions and the lifestyles information research thoughts with regards to sped up trying out. I cant reflect on the other ebook that comes even with regards to this paintings. a good reference for someone drawn to speeded up trying out.

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Additional info for Accelerated Testing: Statistical Models, Test Plans, and Data Analysis (Wiley Series in Probability and Statistics)

Example text

For example, high temperature and voltage are usually used to accelerate life tests of electrical insulation and electronics. Such standard methods and stresses are usually based on much engineering experience. Moreover, many are documented in engineering standards. No standard stresses. For other products there may be no standard stresses. Then the responsible engineers need to determine suitable accelerating stresses. Experimental work to determine appropriate stresses may be required. Such stresses should accelerate the failure modes of interest.

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. Evaluating the model at the average or maximum stress level in use is misleading, since the dependence of product life on stress is highly nonlinear. Test stress levels. Test stress levels should not be so high as to produce mostly other failure modes that rarely occur at the design stress.

Experimental principles. Experimental design books discuss experimental designs and methods for investigating such variables. See, for example, Cox (1958), Little and Jebe (1975), Diamond (1981), Daniel (1976),and Box, Hunter, and Hunter (1978). These books present experimental principles such as randomization and blocking. Such principles help one get clear, correct results, as well as more accurate information. A few basic principles appear briefly below. Many so-called experimental design books only lightly touch on design principles.

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