A spectral method to estimate fatigue life under broadband non-Gaussian random vibration loading

作者：Cheng, Hongwei; Tao, Junyong^*; Chen, Xun; Jiang, Yu

来源：Journal of Vibroengineering, 2014, 16(2): 596-607.

• non-Gaussian vibration
• Gaussian mixture model
• power spectral density
• rainflow cycle distribution
• fatigue damage

The aim of this study is to propose a spectral method for assessing the fatigue lives of mechanical components under non-Gaussian random vibration loadings. Efforts are made to extend the Dirlik's method to non-Gaussian vibration field by introducing the Gaussian mixture model. A symmetric non-Gaussian random vibration can be decomposed into a series of Gaussian components through Gaussian mixture model. Then the rainflow cycle distributions of the Gaussian components can be obtained using Dirlik's method. The cycle distribution of the underlying non-Gaussian process is derived by compounding the distributions of Gaussian components together. The non-Gaussian cycle distribution, combined with Palmgren-Miner rule is used to predict the fatigue lives of specimens. Comparisons among the proposed method, Dirlik's solution, nonlinear model in literature, and the experimental data, are carried out extensively. The results have confirmed good accuracy of the proposed method.

• 出版日期2014-3
• 单位中国人民解放军国防科学技术大学