挖掘装载机动力总成悬置系统隔振性能仿真

Simulation of Vibration Isolation Performance of Backhoe Loader′s Powertrain Mounting System

以某型号挖掘装载机为研究对象,应用拉格朗日方程建立了动力总成悬置系统的数学模型,用Matlab编程求出动力总成悬置系统固有频率和能量分布;并且在ADAMS中建立动力总成悬置系统的6自由度模型,进行怠速工况下的振动仿真,得到系统的固有特性和频域响应曲线;通过比较两者振动特性,验证了模型的正确性,结果表明动力总成悬置系统不能满足动力总成隔振要求,并且存在严重耦合现象,指出在下一步优化过程中,应该缩小固有频率分布范围和提高系统的解耦度.

With regard to backhoe loader,a mathematical model is established for powertrain mounting system with lagrange＇s prin- ciple. A Matlab program is applied to program natural frequency and energy distribution matrix of the system. In addition, a 6-degree- of-freedom of powertrain mounting system is set up using the ADAMS and by carrying out the vibration simulation at idle speed,get- ting natural characteristics and the frequency response curve. The correctness of the model is also validated by the experiments. The results show that the mount system can＇t basically meet the system, which shows we should narrow the range of inherent optimize the design of the system. requirement of vibration isolation and the coupling exists in the mount frequency and improve the vibration coupling degree in the next step to