摘要
针对国产首台载重达300 t的电动轮自卸车车架疲劳性能是否满足设计要求而开展数值分析研究,拟通过寿命预测评估车架疲劳可靠性。首先在MSC.Nastran中对车架进行模态和频率响应分析,获得模态中性文件和输入与结构应力之间的传递函数;再次,借助ADAMS建立整车刚柔耦合多体动力学模型,进行整车C级路面动力学仿真分析,输出车架随机载荷时间历程,并通过傅里叶变换计算其功率谱密度函数(PSD);最后,根据车架材料SN曲线,利用MSC.Fatigue中的Vibration模块进行振动疲劳寿命分析,得到车架危险点的寿命值满足设计要求,从而为后续开展车架可靠性设计和结构优化提供参考依据。
In order to verify whether the fatigue performance of the frame of an electric wheel dump truck with load of 300 t meets the design requirements, the fatigue reliability of the frame is evaluated by life prediction. Firstly, through the modal a- nalysis and frequency response analysis of the frame in MSC. Nastran, the modal neutral file and the transfer function be- tween input and structural stress were obtained. Secondly, through dynamic simulation analysis of vehicle driving on the C grade of road, the random load time history of the frame output, then the power spectral density function was acquired by the way of Flourier transformation. At last,from the vibration fatigue life analysis in MSC. Fatigue -the service life of the danger- ous point of the frame meets the design requirements, which provided a reference for the reliability design and structural opti- mization.
出处
《现代机械》
2017年第3期23-28,共6页
Modern Machinery
基金
湖南省教育厅科学研究项目(16C0488)
关键词
车架
随机振动
功率谱密度
寿命预测
频率响应
多体动力学
frame, random vibration, power spectral density, life prediction, frequency response, multi - body dynamics
