中文摘要：

为了提供一个准确的电液比例变量泵动态元件模型,应用在设计系统中以提高系统的精确性,首先对某型号电液比例变量泵进行机械结构参数测绘,确立电液比例变量泵的基本结构参数,然后根据泵、阀性能参数,利用AMESim软件平台建立了比例流量伺服阀和变量泵的仿真模型。通过对压力、流量、比例阀开口量等多种参数的组合控制,对电液比例变量泵动态特性进行仿真测试和试验验证,得到了相吻合的动态响应曲线,验证了模型的准确性,并直观反映出流量、压力双控下,比例流量伺服阀阀芯、斜盘摆角及其系统压力各种变化的动态响应情况。进一步对电液比例变量泵仿真模型中比例流量伺服阀响应速度、阀口开度增益、控制活塞直径等参数对斜盘动态特性影响进行了研究,结果表明比例流量伺服阀响应越高、阀口开度增益越大、控制活塞直径越小,斜盘动态响应越快,但阀口开度增益过大,会导致斜盘响应超调增加,影响斜盘的动态特性。

英文摘要：

In order to provide a precise model of dynamic components in the electro-hydraulic proportional variable pump and improve the accuracy when design a system,firstly,the mechanical structure parameters of a certain electro-hydraulic proportional variable pump were measured and the basic structural parameters of the pump were confirmed. Then a single model of a piston and the model of the proportional flow servo valve and variable pump were built in AMESim software platform according to the actual parameters of the valve and pump. And the whole model of electro-hydraulic proportional variable pump was constructed based on the sub models. Through the coordinated control of pressure,flow and proportional valve opening,comprehensive simulation test and experimental verification of the dynamic characteristics of the pump were carried out. The dynamic response of the simulation was consistent with the experimental data,which verified the accuracy of the model. The dynamic response of the proportional flow servo valve spool,the angle of the swash plate and the system pressure could be observed directly in the model. The response speed of proportional flow servo valve,valve opening gain and diameter of control piston in this simulation model were adjusted further so effects of these parameters on the dynamic response of the swash plate were obtained. The results show that the swash plate will response more quickly with bigger valve opening gain,faster proportional flow servo valve response,and smaller diameter of the control piston. However,when the valve opening gain gets too large,the swashplate overshoot will increase and it will affect the dynamic characteristics of the swash plate. In this paper,an accurate simulation model was provided for the theoretical research and engineering selection of the electro-hydraulic proportional variable pump.