关键词: 张力控制, 解耦控制, 抗干扰, 自抗扰控制, 混沌粒子群算法

Abstract: Continuous pad dyeing machine is a typical multi-unit joint equipment. According to its pad dyeing process, the continuous pad dyeing machine is divided into unwinding, pad dyeing, drying and winding units. The continuous pad dyeing machine needs to be controlled by constant tension during operation to ensure uniform dyeing of the fabric. If the fabric is subjected to excessive tension, it will produce warp and weft contraction and even fracture, which will affect the quality of pad dyeing. If the fabric tension is too small, it will produce wrinkles or fabric deviation, which seriously affects the economic benefits of enterprises. The pad dyeing unit is the most critical unit of the continuous pad dyeing machine, and its tension control effect will directly affect the printing and dyeing quality of the fabric. Therefore, it is very important to ensure the constant tension of the fabric during the operation of the continuous pad dyeing machine. In this paper, the tension control system of the pad dyeing unit of the continuous pad dyeing machine is taken as the research object. In view of the difficulty of tension control such as tension coupling, the nonlinear coupling mathematical model of the tension system of the rolling mill is established, the static decoupling model is obtained, the control algorithm is designed and verified by simulation experiments.
Firstly, according to the operation mechanism of pad dyeing unit and its structure diagram, the parameters such as moment of inertia in pad dyeing process are analyzed, and the dynamic model of pad dyeing unit is established according to the law of mass conservation and Hooke 's law. By observing the tension mathematical model of pad dyeing unit, it is concluded that there are tension coupling and tension speed coupling between adjacent two rollers, and the system has the characteristics of nonlinear, time-varying, multi-interference and strong coupling. It is difficult to achieve the ideal control effect for the conventional PID controller of this kind of system. In this paper, the tension controller of adjacent rolling workshop is designed by using the combination of chaotic particle swarm optimization ( CPSO ) and active disturbance rejection control ( ADRC ). The dynamic coupling part of the tension system is estimated and compensated by the active disturbance rejection algorithm to realize the complete decoupling of the system, and the chaotic particle swarm optimization algorithm is used to adjust the main parameters of the active disturbance rejection controller online. The tension system of pad dyeing unit is simulated by MATLAB / Simulink, and the control effect of chaotic particle swarm auto disturbance rejection controller and conventional PID controller is observed. The experimental results show that the chaotic particle swarm active disturbance rejection controller is insensitive to the change of internal parameters and has good anti-interference. The control accuracy and stability are better than the conventional PID controller, and it can effectively suppress the tension fluctuation caused by coupling and interference. It is of great significance to improve the overall operation performance of the continuous pad dyeing machine.

Key words:  tension control, decoupling control, anti-interference, active disturbance rejection control, chaos particle swarm optimization algorithm