基于虚拟样机的双向非对称柱塞泵特性研究

Research on Characteristics of Bidirectional Asymmetric Piston Pump Based on Virtual Prototype

根据柱塞泵的物理模型参数,分别在AMESim与ADAMS环境中构建了柱塞泵的液压模型与动力学模型,并通过二者的底层接口搭建起液固耦合的轴向柱塞泵虚拟样机模型。基于虚拟样机,研究EHA三油口非对称柱塞泵的正反旋向特性。结果表明:随着转速的提高,柱塞泵的出口流量脉动率降低;随着负载的增加,单柱塞所受轴向液压力升高,泵的输入转矩增加;反转情况下,柱塞通过三油口柱塞泵配流窗口之间的非死点过渡区域时会产生比正转时更大的流量脉动与压力超调。在此基础上,通过试验测试,验证了仿真结果及设计参数的正确性。

According to the physical model parameters of the plunger pump,the hydraulic model and the dynamic model of the axial piston pump were constructed in the AMESim and ADAMS environments respectively.The liquid⁃solid coupling axial piston pump virtual prototype model was built through the bottom interface of the two models.Based on the virtual prototype,the forward and reverse rotation characteristics of the EHA three⁃port asymmetric piston pump were studied.The results show that with the increase of the rota⁃tional speed,the pulsation rate of the outlet flow of the piston pump decreases;with the increase of the load,the axial hydraulic pres⁃sure of the single plunger increases,and the input torque of the pump increases.In the case of a reversal,the greater flow fluctuation and pressure overshoot will occur when the piston passes through the non⁃dead point transition area between the distribution windows of the three⁃port axial piston pump.On this basis,the correctness of the simulation results and design parameters is verified by experi⁃ments.