柱塞泵机液动态耦合仿真与实验研究

Simulation and Experimental Research on Mechanical-hydraulic Coupling of Piston Pump

为解决机液耦合条件下斜盘式轴向柱塞泵的数字化设计问题,采用基于机械与液压系统联合仿真的方法对柱塞泵进行建模与解耦分析。基于功率键合图理论建立了柱塞泵液压模型,并定义了柱塞泵柱塞腔流体对柱塞端面的压力为耦合变量,利用拉格朗日法建立了柱塞泵刚体动力学模型,将液压模型耦合变量作为动力学模型的输入,定义动力学模型的实际转速测量为液压模型的输入,从而构成一个完整机液耦合仿真模型,通过解析对柱塞泵进行了机液解耦设计。最后,搭建了实验平台,以泵出口的流量和压力为检测量,比较了仿真结果与实验结果,从而验证了该方法的正确性与可行性,为柱塞泵的一体化设计奠定了基础。

In order to solve the problem of digital design of swashplate axial piston pump in the condition of mechanical and hydraulic coupling, this paper used the co-simulation method to bulid the model and analyse the coupling of the piston pump. A power bond graph theory was used to establish hydraulic model of the piston pump, the piston chamber pressure was defined as the coupling variables. The Lagrange method was used to establish dynamics model of the piston pump, coupling variables in hydraulic model were defined as input variables of mechanics model, and the actual speed measured on mechanic model was defined as the input variable of hydraulic model.The decoupling analysis was finished by the complete mechanical and hydraulic coupling model. Finally, an experimental platform was built to verify the correctness and feasibility of the simulation method, the flow rate and pressure between experiment and simulation were compared, and the foundation for the integrated design of piston pump will be built.