| 引用本文: | 鲁相,汪亚顺,陈循,等.基于似然比检验的橡胶密封件加速试验机理一致性判别方法.[J].国防科技大学学报,2019,41(2):144-149.[点击复制] |
| LU Xiang,WANG Yashun,CHEN Xun,et al.Identification method of mechanism consistency for rubber seals accelerated testing based on likelihood ratio test[J].Journal of National University of Defense Technology,2019,41(2):144-149[点击复制] |
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| 基于似然比检验的橡胶密封件加速试验机理一致性判别方法 |
| 鲁相1,2, 汪亚顺1, 陈循1, 谭源源1 |
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(1.国防科技大学 智能科学学院， 湖南 长沙 410073;2.中国空气动力研究与发展中心 设备设计及测试技术研究所， 四川 绵阳 621000)
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| 摘要: |
| 加速退化试验广泛应用于橡胶密封件等长寿命产品的可靠性评估，试验过程中需要将高应力水平下的试验结果外推到正常应力水平。要获得准确的产品可靠性评估结果，需要保证加速应力下的退化失效机理与正常应力下的退化失效机理一致。基于似然比检验原理，提出加速退化试验机理一致性判别方法及流程。针对失效机理一致与失效机理变化两种场合，提出对数线性及非对数线性两类加速模型，并结合混合效应模型描述产品退化过程。利用似然比检验判断加速模型参数是否变化，完成失效机理一致性判别。仿真算例和应用实例表明，该方法能够有效判别橡胶密封件失效机理是否变化，并找到失效机理不变的应力水平边界。 |
| 关键词: 加速退化试验 失效机理一致性 似然比检验 加速模型 混合效应模型 |
| DOI：10.11887/j.cn.201902021 |
| 投稿日期：2018-01-08 |
| 基金项目:国家自然科学基金资助项目（51375487，51205402） |
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| Identification method of mechanism consistency for rubber seals accelerated testing based on likelihood ratio test |
| LU Xiang1,2, WANG Yashun1, CHEN Xun1, TAN Yuanyuan1 |
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(1.College of Intelligence Science and Technology, National University of Defense Technology, Changsha 410073, China;2.Facility Design and Instrumentation Institute, China Aerodynamic Research and Development Center, Mianyang 621000, China)
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| Abstract: |
| Accelerated degradation testing has been widely used to investigate the reliability of long lifetime products, including rubber seals. The test results at higher stress levels were extrapolated to the normal stress level in the accelerated degradation testing. For an accurate product reliability evaluation, the failure mechanism under accelerated stresses should be consistent with the mechanism under normal conditions. Based on the likelihood ratio test, an identification method and a flow chart were proposed. For describing the mechanism consistency and variation, log-linear and non-log-linear acceleration models were suggested, and the mixed-effects model was introduced to depict the degradation process. According to the judgment between the consistency and variation of acceleration model parameters, the identification was completed. The simulation test and the real test show that this method can identify the mechanism variation of rubber seals. Moreover, the stress boundary for consistent mechanism is found by the identification method. |
| Keywords: accelerated degradation testing failure mechanism consistency likelihood ratio test acceleration model mixed-effects model |
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