Research Based On Parallel Control Method In The Process Of NdFeB Hydrogen Decropitation

NdFeB permanent magnetic materials are widely used in various industries, andprofoundly affect the development of the national economy. In recent years, hydrogendetonation process in NdFeB production is playing an increasingly important role in theprocess of preparation, therefore, automatic control in the process has become a researchhot spot problem. The problems such as time-varying, nonlinear and couplingcharacteristics brought great difficulty to automatic control in NdFeB hydrogen detonationprocess, and the comminution degree online monitoring is difficult to achieve, so it is noteasy to complete high level of automation control. Based on the deep analysis of thehydrogen detonation process and principle, using the method of CBR to find the mostsimilar cases with current production as the control target from the historical database,combined with the parallel control, part of a dynamic mechanism model and parameters ofthe model to predict the hydrogen absorption process as NdFeB hydrogen detonationmanual system. Through the method of simulation experiment and theoretical model iscorrect, according to the method of the artificial system using ADP design of controlstrategy. The purpose is to achieve double closed loop artificial system and actual systemcontrol.The main contents of this thesis includs the following parts:1. Analyze the principle and process of the hydrogen detonation for NdFeB.2. Establish the NdFeB hydrogen detonation case control system based on the methodof CBR, the purpose is to optimize the control parameters of hydrogen detonation process,on the other hand is to retrieve the most similar case compared with the experiment.3. Design the NdFeB hydrogen detonation manual system according to the parallelcontrol theory, including dynamic mechanism model and the parameter prediction modelwhich is composed of temperature,pressure and the amount of hydrogen.Among them,dynamic mechanism model is obtained by the method of mathematical modeling and parameter prediction model is obtained by the method of BP neural network. All kinds ofsimulation were carried out in order to verify the correctness of the models, and theexperimental results show that the dynamic mechanism and neural network model can welldescribe the real system.4. Use ADP method to design the optimal control strategy on artificial systems, thetarget is to realize the closed-loop control of artificial system, and to achieve the doubleclosed-loop control combined with the actual system, our ultimate goal is to establish aparallel control system for the hydrogen detonation of NdFeB.This topic puts forward the parallel control idea of NdFeB hydrogen detonationprocess control which is a process of hydrogen decrepitation on high level of automationcontrol, the following research work in this field is of pioneering significance.