轴向柱塞泵全局耦合动力学建模

Global Coupled Dynamical Modeling of Axial Piston Pump

轴向柱塞泵内部子系统强耦合作用下柱塞泵呈明显的全局耦合特性,而柱塞泵传统局部动力学模型普遍存在恒压力、定转速等假设条件,缺乏对全局耦合特性的综合分析能力,为此在分析子系统间结构关系及耦合情况的基础上,提出一种基于数组的键合图建模方法,建立了斜盘式轴向柱塞泵键合图模型。进行了柱塞-滑靴子系统摩擦学-动力学耦合机理分析,并定义能量损耗因子,综合包含非线性因素的各子系统动力学方程参数,最终导出柱塞泵全局耦合动力学模型。对模型进行了仿真,仿真结果与实际情况吻合,验证了模型的有效性和正确性。

In order to make the global coupling characteristic researches of axial piston pump possible,this paper analyzed the configuration and the coupling situation between the subsystems,and then a bond graph modeling method based on array was proposed to develop the dynamical model of piston pump. The energy loss factor was defined which contains swash plate angle,contact length between the piston and the cylinder,piston pair and slipper pair friction coefficient. So the state space model of piston pump was obtained by the tribology and dynamics coupling mechanism analysis of piston-slipper subsystem. The dynamical equation parameters of the subsystem which contains nonlinear factors are integrated in the global coupling dynamical model of piston pump clearly and concisely. The simulation results show that the coupling between the ripple of flow and pressure and the fluctuation of speed and torque becomes more obvious under high pressure,and the fluctuation of speed will influence the ripple of flow and pressure seriously when its amplitude reaches a certain level. The simulation results of piston pump running state and efficiency variation are in agreement with the actual situation. So the global coupling dynamical model of piston pump is effective and correct. Compared with the traditional local model of piston pump based on the assumption of constant pressure or constant speed, the global coupling dynamical model of piston pump established in this paper can be used to investigate energy saving and noise reduction,fault diagnosis,volume control and nonlinear dynamics analysis realistically.