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采用多体系统动力学仿真软件SIMPACK建立完整的机车车辆系统动力学模型,通过线性分析,得到作用于构架上的载荷谱;利用有限元分析软件ANSYS建立详细的构架有限元模型并求解其各阶固有频率和振型,同时确定危险点所在位置。然后进行谐响应分析得到危险点应力载荷间的传递函数;最后通过作用于构架上的载荷谱与传递函数叠加得到危险点的输出应力谱。该研究方法能有效地运用于构架结构设计阶段——获得其应力谱,为在频域中对构架的疲劳寿命作出评估奠定了基础。该仿真技术同样适用于其他相关研究领域,如航空航天、工程机械和公路车辆等。
The system dynamics model of locomotive and rolling stock is established by SIMPACK, a multi-body system dynamics simulation software. The load spectrum acting on the structure is obtained by linear analysis. The finite element analysis software ANSYS is used to build a detailed finite element model of the structure and to solve its various steps Natural frequency and vibration mode, at the same time determine the location of the dangerous point. Then the harmonic response analysis is carried out to obtain the transfer function between the stress points of the dangerous point. Finally, the output stress spectrum of the dangerous point is obtained by superposing the load spectrum and the transfer function acting on the frame. The research method can be effectively applied to the design phase of the frame structure-obtaining its stress spectrum, which lays the foundation for evaluating the fatigue life of the frame in the frequency domain. The simulation technology is equally applicable to other related research areas, such as aerospace, construction machinery and road vehicles.