线性摩擦焊机液压伺服振动系统数字PID控制方法研究

线性摩擦焊机液压伺服振动系统通常采用双闭环控制，在使用传统模拟放大器负反馈控制方法调节系统内外环时，参数调节繁琐难度大，控制效果并不理想。本文在系统内外环的前向通道上均采用数字PID控制器，首先利用MATLAB/Simulink软件对数字PID控制系统进行仿真实验，以确定控制模式；然后编制数字PID控制器软件，应用到线性摩擦焊机进行实验。结果表明，参数调节更加简单易行，控制取得了更好效果。

Study on Digital-PID Control for the Hydraulic Servo Vibration System of Linear Friction Welding Machine

The hydraulic servo vibration system of linear friction welding machine usually adopts the double close-loop control. When the negative feedback control method of using traditional analog amplifiers is being used to adjust the inner and outer close-loop of the system, it is difficult to adjust the parameters and the control effect is not good. The digital-PID controllers are adopted in the frontal channel of the inner and outer close-loop of the system. Firstly, the simulation experiment of digital-PID control system is done by the use of MATLAB/Simulink software and the control mode is determined. And then, the digital-PID software which is applied to the linear friction welding machine is written. The results show that the parameters adjustment is more simple and easy to operate, and the control has obtained better effect.