基于频域法的耐久性振动寿命分析

Analysis of Durable Vibration Life Based on Frequency Domain Method

采用基于功率谱密度函数的频域法,对某托架随机激励下的振动疲劳寿命进行分析。本文利用Patran、Nastran软件对托架结构进行随机振动分析,并根据计算结果选取危险点,再运用危险点处响应曲线及振动疲劳寿命理论,估算托架结构的耐久性寿命,为结构振动疲劳寿命提供一种新的工程算法。

The analysis of vibration fatigue life of some bracket under random excitation is performed by adopting frequency domain method on the basis of power spectral density function. This paper conducts random vibration analysis of bracket structure with the application of the Patran and Nastran softwares and selects the dangerous points in accordance with the calculation result. The durable life of bracket structure is estimated through the response curve of dangerous points and vibration fatigue life theory, which provides a new engineering method to estimate vibration fatigue life of structure.