一种新的非高斯随机振动疲劳寿命估计方法

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振动与冲击 ›› 2014, Vol. 33 ›› Issue (18) : 209-213.

论文

一种新的非高斯随机振动疲劳寿命估计方法

袁毅程军圣

作者信息 +

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

Yuan Yi, Cheng Junsheng

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文章历史 +

摘要

构造了非高斯修正系数的多项式响应面模型，提出了一种基于高斯近似的非高斯随机振动疲劳寿命估计方法。采用Winterstein传递函数法将非高斯随机应力转化成高斯随机应力，并联合雨流计数和Miner损伤准则分别估算两种随机应力下的累计损伤和谱矩，对多个样本进行最小二乘拟合之后构建一个关于应力谱矩和非高斯修正系数的多项式响应面模型。利用高斯近似法估算非高斯随机振动疲劳损伤量，并与经过雨流计数和Miner损伤准则估算的非高斯随机过程下疲劳损伤对比，结果表明：高斯近似法具有较好的精度。

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.

导出引用

袁毅程军圣. 一种新的非高斯随机振动疲劳寿命估计方法[J]. 振动与冲击, 2014, 33(18): 209-213

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