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| Research on the Calculation Method of Overall Acceleration Factor Based on Reliability Allocation |
| Received:March 29, 2015 Revised:June 15, 2015 |
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| DOI：10.7643/issn.1672-9242.2015.03.010 |
| KeyWord:acceleration factor reliability allocation accelerated test |
| Author | Institution |
| LI Peng |
School of Reliability and Systems Engineering， Beihang University， Beijing ， China |
| LI Chuan-ri |
School of Reliability and Systems Engineering， Beihang University， Beijing ， China |
| LI Tao |
School of Electronic and information Engineering， Beijing Jiaotong University， Beijing ， China |
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| Abstract: |
| Objective To verify the reliability of system-level equipment with high reliability and long life. Methods Based on RPN data, the reliability allocation method was established, and the failure rate of subsystems for each failure mode was obtained. According to various stresses that may lead to different failure modes, acceleration factor under the stress of thermal cycling, thermal dwell, humidity and vibration was studied, and the formula to calculate the overall acceleration factor was deduced. And the accelerated test of a typical electronic product was taken as an example to demonstrate the effectiveness of the proposed approach. Results The calculated overall acceleration factor was 322.5, which was closer to the actual condition than the value of 4.78×105 calculated based on the traditional method. Conclusion The calculation method ofoverall accelerated factor based on reliability allocation provides reasonable theoretical reference for reliability verification test of system-level equipment. |
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