By Wayne B. Nelson
This sensible source presents modern, statistical equipment for sped up trying out together with try versions, analyses of knowledge, and plans for trying out. each one subject is self-contained for simple reference. assurance is wide and distinct adequate to function a textual content or reference. this convenient e-book positive aspects actual try examples besides facts analyses, laptop courses, and references to the literature.
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Extra info for Accelerated Testing: Statistical Models, Test Plans, and Data Analysis 1st edition (Wiley Series in Probability and Statistics)
Examples include toasters, dishwashers, rechargable battery cells, switches, and circuit breakers. Many such “cycled” products have customer warranties for a specified calendar time (for example, one year), although cycle usage differs greatly from customer to customer. Throughout this book “time” means any measure of usage. Even if using time, one must decide whether to measure it starting on the date of product installation or manufacture. Sometimes installation dates are not known. Also, if the product runs only part of the time, one must decide whether to measure the actual running time or merely use calendar days in service.
The specimens are sprayed with water, and then a specified voltage is applied to the insulation, which breaks down (failure) or survives. Survivors go back into the oven for the next cycle at temperature. In actual use, motor insulation constantly runs under voltage, is not sprayed with water, and in many applications sees no thermal cycling. Electric cord test. Electric cord for small appliances is subjected to a flex test of durability. A test machine repeatedly flexes each cord specimen until it fails electrically.
Then data from the upper tail is useful, and terminating the test early would miss that important failure mode (Chapter 7). madstion Method. Accelerated degradation testing involves overstress testing. Instead of life, product pefomance is observed as it degrades over time. For example, the breakdown voltage of insulation specimens at high temperature is measured at various ages. A model for performance degradation is fitted to such performance data and used to extrapolate performance and time of failure.
Accelerated Testing: Statistical Models, Test Plans, and Data Analysis 1st edition (Wiley Series in Probability and Statistics) by Wayne B. Nelson