Large-size vehicle loaders are mainly used in various construction projects with complex working environment, which has a serious impact on the internal vibration of the whole system. In this study, the vibration characteristics of hydraulic planetary transmission of vehicle loader considering the influence of the external excitation are evaluated theoretically and experimentally. The output torque of the four-stroke six-cylinder diesel engine is obtained by force calculation of crank and connecting rod mechanism. The equivalent stiffness and damping of the torque converter are solved according to the torsional dynamic equation of the torque converter. The trapped oil area, oil pressure, and flow rate of gear meshing part are extracted to obtain the trapped oil pressure of variable-speed pump. Then, the multi-degree-of-freedom gear system dynamic model is established to calculate the meshing force, which is applied to vibration response analysis model by using mode superposition method. Lastly, the vibration response test is performed on the experimental prototype to verify the calculation method. The conclusion shows that the generation principle of external excitation and its calculation method in this paper are feasible in the analysis of dynamic characteristics of hydraulic planetary torque converter.

大型车载装载机主要用于各种工作环境复杂的建筑工程，对整个系统的内部振动影响严重。本研究从理论和实验两个方面对考虑外部激励影响的装载机液压行星传动的振动特性进行了评估。四冲程六缸柴油机的输出扭矩是通过曲柄连杆机构的受力计算得到的。根据变矩器的扭转动力学方程求解变矩器的等效刚度和阻尼。提取齿轮啮合部分的困油面积、油压和流量，得到变速泵的困油压力。然后，建立多自由度齿轮系统动力学模型计算啮合力，采用模态叠加法将其应用于振动响应分析模型。最后，对实验样机进行了振动响应试验，验证了计算方法。结论表明，本文提出的外激励产生原理及其计算方法在分析液力行星液力变矩器动态特性时是可行的。