8.
Assessing Product Reliability
8.3. Reliability Data Collection 8.3.1. How do you plan a reliability assessment test?
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Guidelines for planning how long to run a reliability growth test | A reliability improvement test
usually takes a large resource commitment, so it is important to have a
way of estimating how long a test will be required. The following procedure
gives a starting point for determining a test time:
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Make sure test time makes engineering sense | The reason the above is just a first pass estimate is it will give unrealistic (too short) test times when a high \(\beta\) is assumed. A very short reliability improvement test makes little sense because a minimal number of failures must be observed before the improvement team can determine design and parts changes that will "grow" reliability. And it takes time to implement these changes and observe an improved repair rate. | ||
Iterative simulation is an aid for test planning | Simulation methods can also be used to see if a planned test is likely to generate data that will demonstrate an assumed growth rate. |