基于MSC的非高斯随机振动疲劳仿真研究

Research on MSC-based Fatigue Simulation Under Non-gaussian Random Vibration

非高斯随机振动与传统的高斯随机振动相比,具有不同的幅值分布特性,对结构振动疲劳损伤累积快慢有着不可忽视的影响。该文以某型号装备在跑车试验中实际采集的非高斯振动数据为样本,系统研究了非高斯随机振动的数值模拟方法,并应用该技术对有限元仿真软件MSC进行二次开发,建立非高斯振动疲劳分析模块,使其具备非高斯振动疲劳寿命分析功能,最后选取典型结构件进行对比仿真分析,揭示非高斯特性对结构振动疲劳的影响,为科学实施装备的跑车试验提供指导。

Compared with the traditional Gaussian random vibration,Non-Gaussian random vibration has a different amplitude distribution,which has a significant impact on the speed of fatigue damage accumulation.Based on the samples of Non-Gaussian random vibration signals collected from the actual vehicle road tests, the numerical simulation method of non-Gaussian random vibration is developed, which can be used to the secondary development of the finite element simulation software MSC.With the non-Gaussian vibration fatigue analysis module,MSC has the function of non-Gaussian vibration fatigue life analysis.Through comparative simulation analysis of the typical structure,the impact on vibration fatigue caused by the non-Gaussian characteristics is revealed,which offers the guidance on the accurate implementation of vehicle road tests.