压力矫直机液压系统的仿真研究.pdf

中国科技论文在线

压力矫直机液压系统的仿真研究
杨伟红,刘兴刚*
(辽宁工程技术大学机械学院,辽宁阜新 123000)
摘要:为了深入研究压力矫直机,根据压力矫直机的机械结构和运动特性,设计了压力矫直
机的液压系统,建立了压力矫直机液压系统的数学模型,并运用 MATLAB 和 DSHplus 软件
对其进行了仿真研究。研究结果表明:系统的幅值稳定裕度和相位稳定裕度都偏大,但总体
来说本系统是稳定的,并需要进一步校正以提高系统的性能;当系统开环增益小于 ×104
时,系统是稳定的;系统临界稳定时的开环增益为 ;阶跃响应时,系统正向运动
后达到稳定;正弦响应时,跟踪曲线存在衰减和滞后;加入模糊 PID 控制后,系统动态响
应特性和稳态特性提高,比例阀的死区得到了很好的补偿。
关键词: 流体传动与控制;压力矫直机;液压系统;仿真;模糊 PID
中图分类号:

Simulation research on hydraulic system of pressure
straightening machine
YANG Weihong, LIU Xinggang
(School of Mechanical Engineering,Liaoning Technical University, Fuxin, Liaoning 123000)
Abstract: In order to study the pressure straightening machine further, according to mechanical
structure and motion characteristics of the pressure straightening machine, hydraulic system of pressure
straightening machine was designed. Mathematical model of hydraulic system of pressure straightening
machine was established. Simulation research on it was carried out by MATLAB and DSHplus. The
research results show: The stability margins of the amplitude and phase in the system are all large
ratherish, but the system is stable generally, and further correction is needed to improve the
performance of the system. When open-loop gain is less than ×104, the system is stable; the
open-loop gain in critical stable state is . Positively movement of