为研究不同刚度车体结构对车辆系统动力学行为的影响，基于柔性多体系统动力学方法，通过有限元分析软件ANSYS和多体动力学软件SIMPACK，对不同刚度车体集装箱平车的动力学性能进行分析。分析结果表明，有边梁结果车体整体刚度相对于无边梁结构得到提升，同时表现在车体的垂直弯曲振型和扭转弯曲变形上。车体的一阶和二阶垂直弯曲刚度分别对车辆中部和端部垂向振动特性影响较大，具体表现为随着垂直弯曲刚度增大，车辆的运行垂向平稳性趋于优化；对于车辆的曲线通过性能，车体垂直弯曲振型对曲线通过安全性指标没有明显影响，车体的扭转刚度对车辆的曲线通过安全性指标影响较大，具体表现为随着扭转刚度增大，车辆的曲线通过安全性趋于恶化。因此，在进行集装箱平车设计时，应采用柔性体模型引入其刚度特性，并根据使用及线路条件对于车体刚度进行折中设计。
In order to analyze the influence of the different car body on the vehicle system dynamics, the dynamics of different stiffness container flat are analyzed with the finite element method software ANSYS and the dynamics software SIMPACK based on the flexible multi-body dynamics. The results show that the overall stiffness of the vehicle body is improved relative to the car body of bound beam structure, and is reflected in the vertical bending mode and the torsional bending mode of the vehicle body. The 1st and 2nd vertical bending stiffness influence the vertical ride quality of middle position and head position greatly. When the vertical stiffness is bigger, the vertical ride quality gets better. The curve negotiating index is impacted by the car body torsional stiffness greatly but no influence by the vertical stiffness. When the torsional stiffness is bigger, the curve negotiating gets worse. Therefore, the stiffness property should be considered in the flexible multi-body dynamics model and the stiffness should be compromised in the design of the container flat according to the use and line conditions.
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