变转速变排量双控轴向柱塞泵脉动特性及噪声研究

基于对斜盘式轴向柱塞泵的理论分析,利用AMESim软件建立变排量柱塞泵模型。在同负载条件下,通过变转速和变排量调节对泵的压力脉动特性进行仿真测试及试验验证,得到仿真和试验曲线基本吻合,验证模型的准确性。并在此基础上根据试验及仿真数据,在相同负载和不同负载下,对采用转速、排量调节相组合情况下泵的压力脉动特性进行比较分析,结果表明随泵转速或排量变大,泵的压力脉动幅值均增大,在独立控制、同流量输出情况下,排量调节比转速调节脉动幅值大;在双控方式下,采用高转速、低排量方式压力脉动幅值最小,功率最大。进一步地,从噪声角度对泵特性进行分析,结果表明在转速、排量独立调节情况下,系统噪声的变化趋势与压力脉动一致;在同负载同流量、变转速和变排量相组合的液压系统中,系统噪声变化与压力脉动变化趋势恰好相反。在同负载同流量下对试验和仿真数据进行对比分析,仿真模型中高转速与低排量组合的压力脉动小,试验曲线中低转速与大排量组合电动机输入功率小,系统噪声低。通过以上分析研究,为变转速和变排量双控理论研究和工程应用提供了技术支撑。

Characteristics of Pulsation and Noise in the Axial Piston Pump with Displacement and Speed Compound Control

Based on the theoretical analysis of axial piston pump, a simulation model of variable displacement pump model is established by software platform AMEsim. Under the same load pressure condition, the pressure fluctuation of pump is simulated and tested by changing rotating speed and pump displacement. The result shows that the experiment curve and the simulation curve are perfectly fitted, which verifies accuracy of the model. On this basis, according to the simulation and experiment data, the pressure pulsation characteristics are compared and analyzed with different combination of displacement and rotating speed in the same loading and different loading conditions. The result shows that the pressure fluctuating amplitude is enlarged with the displacement or the rotation speed increasing. In independent control and same flow output condition, the amplitude in displacement control is larger than in rotating speed control. In the compound control condition, the minimum amplitude and maximum power occurred in high rotating speed and low displacement. Furthermore, from the noise point of view, the varying tendency of the system noise in changing the rotating speed and the displacement respectively is consistent with the pressure pulsation, while in the hydraulic system with the same load and same flow, the changing rule of noise is contrary to pressure pulsation in rotating speed and displacement compound control condition. According to the analysis of the simulation and experimental data, the conclusion is drawn that under the same load, the pressure fluctuation is smaller in the combination of high motor speed and low pump displacement while the motor input power is smaller and the system noise is lower in the combination of low motor speed and high pump displacement. Based on above analysis, it provided technical support for the variable speed and variable displacement compound controlling theory and engineering applications.