Accelerated life test optimization design method based on proportional hazards-proportional odds model
A technology for accelerated life testing and optimization design, applied in the testing of machine/structural components, measuring devices, instruments, etc., to avoid inconsistent optimization results, wide application range and evaluation accuracy
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Embodiment 1
[0191] Embodiment 1: constant stress accelerated life test optimization design;
[0192] Assume that a product undergoes a three-level constant stress accelerated life test, and the test stress is temperature stress. The number of test products available is 300. The operating limit of the tested product is 200°C. For each stress level, the censored time was 300 hours, and at least 20 tested products were required to fail at each stress level.
[0193] The temperature stress level value is converted to 100K according to the Arrhenius model -1 , therefore, the normal stress level of 25°C and the product working limit stress level of 200°C are converted to 0.336 and 0.211, respectively. Using the proportional hazards-proportional advantages model to evaluate the failure data of the accelerated life test pre-test of the product, the estimated values of the model parameters are: β=-60, c=0.5, α=2, γ=3. The estimated values of these model parameters will be used in the accel...
Embodiment 2
[0212] Embodiment 2: step stress accelerated life test optimization design;
[0213] Assume that a product undergoes two-level step stress accelerated life test, and the test stress is temperature stress. The number of test products available is 300. The working limit of the tested product is 210°C. Test at low stress level z 1 carry out τ 1 After time, go to high stress level z 2 (Take the stress level value slightly lower than the working limit of the product at 200°C), and at τ 2 = 300 hours censored. Requires a low stress level z 1 At least 50 tested products failed.
[0214] The temperature stress level value is converted to 100K according to the Arrhenius model -1 , therefore, the normal stress level of 25°C and the high stress level of 200°C translate to 0.336 and 0.211, respectively. Using the proportional hazards-proportional advantages model to evaluate the failure data of the accelerated life test pre-test of the product, the estimated values of the model...
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