液压变压器控制系统稳态刚度特性

Static stiffness of hydraulic transformer controlled system

研究了液压变压器控制系统的稳态刚度特性,根据液压变压器控制系统工作原理,建立了液压变压器控制系统模型,在此基础上分别建立了液压变压器控制马达和液压变压器控制液压缸系统的稳态刚度方程式,分析了影响稳态刚度的因素。同时还推导了泵控马达和泵控制液压缸系统的稳态刚度方程式。对比实验及仿真结果表明:相对于泵控制系统,液压变压器控制系统的稳态刚度较小,并且会随着液压变压器三个配流口的排量变化而改变;增大液压变压器控制角,有利于扩大液压变压器控制系统的压力调节范围,提高系统的稳态刚度。

The static stiffness of the hydraulic transformer controlled system is researched.Based on the working principle of the hydraulic transformer controlled system,the system model is built.According to this system model the static stiffness models of the hydraulic transformer controlled motor and cylinder are established respectively,and the impact factors of the stiffness are analyzed.The static stiffness models of the pump controlled motor and cylinder are also deduced.Contrast experiments and simulations are carried out.Results indicate that compared to the pump controlled system,the stiffness of the hydraulic transformer controlled system is a little smaller.The static stiffness changes with the variation of the displacement of the hydraulic transformer oil port.According to the analysis,properly increasing the control angle of the hydraulic transformer is helpful to increase the pressure adjusting range of the hydraulic transformer controlled system and improve the static stiffness.