By Wayne B. Nelson

This functional source presents modern, statistical equipment for sped up trying out together with try out types, analyses of information, and plans for checking out. every one subject is self-contained for simple reference. assurance is large and specified sufficient to function a textual content or reference. this useful booklet positive factors actual try examples besides facts analyses, desktop courses, and references to the literature.

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Additional info for Accelerated Testing: Statistical Models, Test Plans, and Data Analysis 1st edition (Wiley Series in Probability and Statistics)

Example text

6. Evalitate other variables. Assess how much design, manufacturing, materials, operating, and other variables affect reliability. Optimize reliability with respect to them. Decide which need to be controlled. 7. Acceptance sampling. Assess production or incoming lots. 8. QualifL design and manufacturing changes, components, vendors, etc. 9. Measure reliability. Assess whether to release a design to manufacturing or product to a customer. Estimate warranty and service costs, failure rates, mean time to failure (MTTF), degradation rates, etc.

For many products, companies have standard elephant tests. Professional societies and the government write standards for elephant tests. For example, there is a test standard for power cable insulation. It requires that a specified length of a new cable design go through a specified complex series of voltages and temperatures over a specified length of time. If the cable specimen survives, the new design qualifies for use. MIL-STD-883Cdescribes such tests for qualifying microelectronics. Purposes.

Traditional plans. 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.

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