管鹏，肖守讷
（西南交通大学 牵引动力国家重点实验室，四川 成都 610031）
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。
关键词：有限元；随机振动；疲劳寿命；频域
中图分类号：O324 文献标识码：A 文章编号：1006－0316 (2012) 11－0020－04
Random vibration fatigue simulation of vehicle contamination box based on information in frequency domain
GUAN Peng，XIAO Shou-ne
( National Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China )
Abstract：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.
Key words：FEM；random vibration；fatigue life；frequency domain
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收稿日期：20121－04－23
作者简介：管鹏（1986－），女，山东临沂人，硕士研究生，主要研究方向为结构强度与疲劳寿命分析。
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