机械式模拟运输台仿真研究

模拟运输振动试验台作为一种机械式随机振动模拟器,能够较好地再现汽车运输振动环境。针对模拟运输台在调试、使用时具有一定盲目性的问题,进行了运动学仿真。仿真结果与实测数据吻合良好,验证了模型建立的正确性,调整模拟运输台上可变参数进行一系列的仿真,总结这些参数对于最终结果影响的规律。仿真结果表明,模拟运输台的台面振动由系统自激振动和凸轮带动台面强迫振动复合而成;台面上功率谱密度的第一主峰主要和系统的自激振动有关,第二主峰主要和凸轮带动台面的强迫振动有关。

Simulation Research of the Mechanical Simulation of Transport Vibration Test Stand

As a mechanical random vibration simulator,simulation of transport vibration test stand can well reproduce the vibrational condition of automobile transportation.However,there are some confusion in the process of debugging and using the simulation of transport vibration test stand.In order to avoid these problems,kinematic simulation was carried out.The simulation results and experimental data coincide well to verify the correctness of the model.A series of simulations were carried out to summarize the influencing rule of these parameters on final result.Simulation results showed that the vibration of stand face consists of system′s self-excited vibration and the forced-vibration of the stand face driven by the cam,the system′s self-excited vibration mainly affects the first peak,while the forced-vibration of the stand face driven by the cam mainly affects the second peak.