Fatigue life analysis of automotive key parts based on improved peak-over-threshold method
Fatigue life analysis of automotive key parts based on improved peak-over-threshold method
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DOI：
10.1111/ffe.13235
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发表时间：
2020-04-12
影响因子：
3.7
通讯作者：
Wang, Xiaolan
中科院分区：
文献类型：
--
作者：
Liu, Xintian;Zhang, Minghui;Wang, Xiaolan
为了消除阈值峰值（POT）外推法的局限性，本文提出了一种改进的POT外推法来重建零件的载荷序列和频率。基于广义帕累托分布（GPD）建立阈值模型。假设路面不平整度服从正态分布，重构上下阈值之间的荷载，以获得更动态的道路荷载数据。采用雨流计数法计算负载信号的峰谷值和频率，讨论了POT外推法改进前后负载均值和幅值的特点。通过预测摆动支撑杆的疲劳寿命，验证了增强方法的有效性和保守性。
To eliminate the limitations of the peak-over-threshold (POT) extrapolation method, the paper proposes an improved POT extrapolation method to reconstruct the load sequence and frequency of the part. A threshold model is established based on a generalized Pareto distribution (GPD). Assuming a road surface's irregularity obeys a normal distribution, the load between the upper and lower thresholds is reconstructed to obtain more dynamic road load data. Rain-flow counting method is used to calculate the peak-to-valley value and frequency of the load signal, and the characteristics of the load mean and amplitude before and after the improvement of the POT extrapolation method were discussed. The effectiveness and conservativeness of the enhanced method are verified by predicting the fatigue life of a swing support rod.