调速阀出口节流调速系统动态特性仿真研究

为获得节流调速系统在不同工作条件下的动态特性,在MATLAB/Simulink环境下建立调速阀出口节流调速系统的仿真模型,分析不同开口面积和不同外负载对系统启动及速度切换时动态特性的影响,得出如下结论:(1)在不同开口面积和外负载工况下启动时,液压缸均会有不同程度的速度超调,尤其是在低速和轻载的工况下更为明显;(2)外负载一定时,液压缸速度与调速阀的开口面积成比例,表现为开口面积越小启动时的超调量越大;(3)在同一调速阀开口面积、不同外负载情况下,系统启动后的速度稳态值基本一致,表明该回油调速系统具有良好的速度刚度特性;(4)外负载主要影响系统的瞬态响应过程,在小负载情况下,系统超调量和速度达到稳定值所经历时间较大负载时有所增加。

Simulation Study on Dynamic Characteristics of Speed Regulating Valve Outlet Throttle Speed Regulating System

In order to obtain the dynamic characteristics of the throttling speed control system under different working conditions, the simulation model of the speed control valve outlet throttling speed control system is established in MATLAB/Simulink environment, and the simulation research is carried out. Through simulation, the effects of different opening areas and different external loads on the dynamic characteristics of system startup and speed switching are analyzed, and the following conclusions are drawn. Firstly, when starting under different opening areas and external load conditions, the hydraulic cylinders will have different speed overshoots, especially in low speed and light load conditions. Secondly, when the external load is constant, the hydraulic cylinder speed is proportional to the opening area of the speed control valve, which means that the smaller the opening area, the larger the overshoot when starting. Thirdly, in the case of the same speed control valve opening area and different external load, the steady state value of the system after starting is basically the same, which indicates that the oil return speed control system has good speed stiffness characteristics. Finally, external load mainly affects the transient response process of the system. Under the condition of small load, the time that the overshoot and speed of the system reach the stable value increases when the load is large.