结构声疲劳寿命估算中的随机响应分析——功率谱密度法  

The Random Response Analysis in the Structure Sonic Fatigue Life Estimation Power Spectral Density Method

作　　者：徐绯[1] 肖寿庭[1] 

机构地区：[1]西北工业大学

出　　处：《机械科学与技术》1996年第6期859-862,共4页Mechanical Science and Technology for Aerospace Engineering

摘　　要：通过对传统声疲劳分析方法的回顾，以及对声疲劳学科所涉及的理论领域的深入研究，作者认为传统的声疲劳分析方法在响应计算中存在明显不足，它仅考虑了少数固有频率甚至单一固有频率的影响，对一个宽频带的噪声激励谱的响应分析过于粗糙，对于高声压级的噪声载荷，由于非线性大挠度的影响使结构固有频率发生偏移，分析计算结果误差更大。为此，本文提出所谓功率谱密度法。There are apparent shortcomings in calculaing structure response of displacements and stresses by the traditional sonic fatigue analytical ways which only consider a few (or even single) natural frequences. For high intensity noise,the natural frequences changed because of the nonlinar large deflcction, so the calculated result becomes unacceptable.In this paper, a random response analytical method,Power Spectral Density Method, for better estimation of sonic fatigue life is proposed.

关 键 词：噪声载荷 声疲劳 功率谱密度 机械强度 

分 类 号：TH114[机械工程—机械设计及理论]