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为提升高速列车转向架测试设备的技术水平,提出了一种用于转向架悬挂刚度动态测试的六自由度加载平台.对此平台建立了的位姿解算模型,并确立了平台运动姿态与七台液压缸伸缩量的函数关系.通过对加载系统特点的分析,建立了基于RBF网络整定PID参数的多通道协同加载的控制策略,对每个单通道则采用了零相差前馈跟踪的控制策略.仿真结果证明,这种控制策略不仅对单缸的位移控制具有快速响应的特点,同时也能够对多通道加载实现快速跟踪,提高了六自由度加载平台的运动精度,可将该平台结构和控制策略应用于转向架悬挂定位刚度的动态测试当中.
In order to improve the technical level of high-speed train bogie testing equipment, a six-degree-of-freedom loading platform for the dynamic test of bogie suspension stiffness was proposed, and a position and attitude solution model was established for the platform, Qidong hydraulic cylinder expansion and contraction.According to the analysis of the characteristics of the loading system, a multi-channel cooperative load control strategy based on RBF network tuning PID parameters was established, and for each single-channel, the zero-phase difference feedforward tracking control The simulation results show that this control strategy not only has the characteristics of fast response to single cylinder displacement control but also can track the multi-channel loading quickly and improve the motion accuracy of the six-DOF loading platform, And control strategy applied to the dynamic test of bogie suspension positioning stiffness.