基于Simulink的等静压机升压系统建模与仿真

Modeling and Simulating for Rising-Pressure System of Isostatic-Pressure Machine based on Simulink

摘要:

研究等静压机升压系统的组成,通过理论辨识法确定控制系统模型结构,采用阶跃响应法确定模型参数,得到系统数学模型;研究各种非线性因素对升压曲线控制精度的影响,进而确定控制算法;设计比例-积分控制器,对控制器参数进行理论仿真整定,在Simulink上组建仿真平台,对等静压机升压过程按照一次曲线、抛物线、圆、椭圆及组合曲线进行系统级仿真实验,跟随误差低于1 MPa;结果表明:所设计比例-积分控制策略可以满足等静压机在0~200 MPa下的升压曲线控制精度要求。

Abstract:

Study constitute of the rising-pressure system of Isostatic-Pressure, obtain the mathematic modeling of control system by theory identification, obtain the characters of mathematic model by step response method, then obtain the mathematic model. Study the infection of rising-curve controlling precision by all kinds of non-linear factor, then obtain the controlling arithmetic. Design proportional-integral controller, adjust the controller parameters by theory simulation, carry out the system-levels simulation experiment aiming at linear curve, parabola, ellipse, round and compound curve on the SIMULINK platform. As result, the compound curve is lower than 1 MPa . The result demonstrates that the proportional-integral controlling strategy can meet the wide-pressure extent and high-precision curve controlling of the rising-pressure system of WIP. 