Reliability Analysis for Mechanical Components Subject to Degradation Process and Random Shock with Wiener Process
Reliability Analysis for Mechanical Components Subject to Degradation Process and Random Shock with Wiener Process
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DOI：
10.1007/978-3-642-37270-4_51
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Huibing Hao;C. Su;Z. Qu
中科院分区：
文献类型：
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作者：
Huibing Hao;C. Su;Z. Qu
对于机械部件，通常有几个不同的过程会导致部件失效。本文研究了构件具有退化过程和随机冲击两种失效过程的可靠性建模问题。退化过程用Wiener过程描述，考虑了随机冲击对退化过程的累积影响，并讨论了冲击的影响。用极大似然估计法对模型参数进行估计。给出了疲劳裂纹扩展的算例，验证了所提模型和方法的有效性。并将可靠性评估结果与正态分布方法进行了比较。结果表明，考虑冲击的影响会明显降低系统的可靠性。因此，冲击对退化的影响是不可忽视的。
For mechanical component, there are usually several different processes which can cause the component to failure. In this paper, the reliability modeling is studied for the component which has two kinds of failure processes, i.e., degradation process and random shocks. The Wiener process is used to describe the degradation process, the cumulative effect due to random shock on the degradation process is considered, and the effect of shock is discussed. The parameters of the model are estimated by the maximum likelihood estimation method. A case study of fatigue crack growth is provided to illustrate the proposed model and method. The reliability assessment results are also compared with the method of normal distribution. The results show that considering the impact of shocks can obviously lower the reliability of the system. Thus, the effect that the shocks act on the degradation may not be neglected.