A new method for fatigue life estimation under non-Gaussian random vibration

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Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (18) : 209-213.

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A new method for fatigue life estimation under non-Gaussian random vibration

Yuan Yi, Cheng Junsheng

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Abstract

In this paper, it constructs a non-Gaussian correction coefficient based on polynomial response surface model, and proposes a new method for fatigue life estimation under non-Gaussia-
n random vibration. Transforming the non-Gaussian random stress into Gaussian random stress based on Winterstein transfer function method, estimating their cumulative damage and spectral moments based on rain-flow counting and Miner damage criterion, constructing a polynomial response surface model for stress spectral moments and non-Gaussian correction coefficient based on the method of least squares for many samples. Contrasting non-Gaussian random vibration damage based on Gaussian approximation and based on rain-flow counting and Miner damage criterion, the results shows that Gaussian approximation has better accuracy.

Key words

response surface / non-Gaussian / vibration fatigue / non-Gaussian correction coefficient / fatigue life estimation

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Yuan Yi;Cheng Junsheng. A new method for fatigue life estimation under non-Gaussian random vibration[J]. Journal of Vibration and Shock, 2014, 33(18): 209-213