轴向柱塞泵流动特性理论建模与试验分析

Modelling and Experiment Study on Fluid Character of Axial Piston Pump

利用油液可压缩特性建立了单柱塞流动特性模型,通过对柱塞运动规律、配流盘过流面积、节流系数、泄漏效应等重要参数的分析优化,提高了模型精度,在此基础上,利用集中参数建立了柱塞泵的整泵数学模型。通过Matlab编程建立了柱塞泵流动特性的仿真模型,编制了图形用户界面,能够实现对柱塞泵结构、工作参数、系统环境参数与柱塞泵流动特性(如压力冲击、流量脉动等)之间的自动仿真和分析。利用柱塞泵压力流量脉动测试试验台对柱塞泵流动特性进行测试,测试结果验证了模型的正确性和精度,证明改进的柱塞泵流动特性模型能够比较准确地对柱塞泵流动特性进行分析和预测,分析误差可以控制在5%以内。

To study the fluid character of axial piston pump,a mathematical model of flow condition in piston chamber was developed with compressibility of fluid oil.The model was further improved by analysis of movement model of piston,cross area of valve plate,throttle coefficient,flow loss inside pump,etc.Besides,the model of whole piston pump with its hydraulic system was developed with lamped parameter method.A simulation system was built by using Matlab based on the mathematical pump model.A visual graphical user interface was established to automatically analyze the relation between pump geometric structure,working conditions,system parameters and flow conditions of pump.The flow conditions of the pump were tested by using pump flow ripple test rig.It is shown that the pressure pulsation and flow ripple results calculated by the mathematical model agree well with the experimental results.The analytical error can be controlled within 5%.It can be concluded that the developed mathematical model has high precision and can accurately predict the fluid character of axial piston pump.