摘要
以某一车载污物箱为例,详细地介绍了基于频域的随机振动疲劳仿真技术理论及实现过程:即首先对结构进行频域响应计算,得到结构的传递函数,再将此传递函数与输入的功率谱相乘,获得结构的应力功率谱密度,再结合材料参数,选择合适的疲劳损伤模型,利用频域法计算结构的疲劳寿命。频域方法计算简单,不需要循环计数,因此,采用功率谱密度法估算结构疲劳寿命的方法具有很强的工程实用价值,受到了广泛重视。
Take the vehicle contamination box for example,this paper introduces the theory and realization process of random vibration fatigue analysis based on frequency domain method in detail.That is,calculating the frequency response of the structure to obtain the transfer function at first,then multipling this transfer function with the power spectrum to obtain the stress power spectral density of the structure,combing which with the material parameters,and selecting the appropriate damage model,it is able to figure out the fatigue life of the structure through frequency domain method.This method provides technical support for the fatigue design of vehicle equipment.As the analysis process of frequency domain method is concise,and no need of cycle count,this method is valuable for engineering utility,and thought much of.
出处
《机械》
2012年第11期20-23,共4页
Machinery
关键词
有限元
随机振动
疲劳寿命
频域
FEM
random vibration
fatigue life
frequency domain
