Modeling Of The Sintered Glass Vacuum Chamber, Vacuum And Control System Design

As an important control object of sintering process, vacuum chamber pressure's control performance impacts the quality of merits directly. In the situation that iron ores are very shortage and the increasing requirements of sinter's quality, research on vacuum chamber pressure's modeling and controlling is of important practical significance.Firstly, this paper describes the sintering process, and through comparing and studying the principle of the generation of the vacuum chamber pressure, proposes a method to control the vacuum chamber pressure by using frequency control technology. Meanwhile, the advantages and disadvantages of the traditional PID, Fuzzy control and neural network control are compared, and in this foundation, fuzzy PID control strategy for vacuum chamber pressure is proposed, based on the vacuum chamber pressure's characteristic of nonlinear and large time delay.At the same time, according to there's a little mathematical model of vacuum chamber pressure, which is not conductive to the control strategy's research. This paper establishes the pressure's mathematical model by using BP neural network identification. Using this model to simulate, the result shows that the Fuzzy PID control algorithm has fast dynamic response, high steady-state accuracy and robustness.Finally, this paper using industrial control computer as host computer, PLC as lower computer, designed a control system of vacuum chamber pressure, based on the Fuzzy PID control algorithm. System testing results showed that is running well, and had made satisfactory control effect.