By Wayne B. Nelson
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Additional info for Accelerated Testing: Statistical Models, Test Plans, and Data Analysis (Wiley Series in Probability and Statistics)
Moreover, nonuniform thickness complicates the meaning of voltage stress, as it differs from point to point on the insulation. Section 4 of Chapter 7 treats applications with nonuniform stress. Corrected stresses. If observed to be different from its intended value, the actual value of a test stress should be used in the data analyses. For example, ambient temperature or humidity may be wrong. Suppose a specimen is hotter than ambient due to electrical or mechanical power dissipated in it. Then one must determine the correct specimen temperature or humidity.
Traditional engineering plans have three or four test levels of a single stress and the same number of specimens at each level. This practice yields less accurate estimates of product life at low stress. As shown in Chapter 6, more accurate estimates are possible. One should run more specimens at low test stresses than at high test stresses. Also, allocating the specimens to four stress levels usually yields less accurate estimates than allocating them to three or two stress levels. Number of specimens.
Then an accelerated test typically employs random stresses with the same distribution as actual random stresses but at higher levels. Like cyclic stress tests, random stress models employ some characteristics of the stress distribution as stress variables (say, the mean, standard deviation, correlation function, and power spectral density). Then such a test is regarded as a constant stress test; this, of course, is simplistic but useful. 1 where the horizontal line shows the mean stress. Moreover, specimen life is modeled with a constant stress model, and the data are analyzed accordingly.
Accelerated Testing: Statistical Models, Test Plans, and Data Analysis (Wiley Series in Probability and Statistics) by Wayne B. Nelson