Design And Joint Simulation Of New Controller For Hydraulic Press Based On AMESim-Simulink

In recent years,the requirement of advanced hydraulic press with high forging precision,high speed and automation level is getting higher and higher in our country.Hydraulic press system is a typical non-linear system and has strong coupling relationship.If these problems can not be solved well,not only the control precision can not meet the requirement,but also the consequences of system jamming and platform overturning will be caused in serious cases.Based on these problems,the control accuracy of hydraulic press has a very high requirement.In order to effectively solve the above problems,this paper first proposes a control improvement strategy for the hydraulic system with periodic disturbance,and verifies the feasibility of this method through simulation;secondly,AMESim-MATLAB/Simulink co-simulation is carried out for single-cylinder hydraulic press using the improved sliding mode variable structure exponential reaching law as the controller;secondly,the complexity of multi-cylinder hydraulic press system is studied.The strategy of control allocation is used to solve the non-linearity,coupling and redundancy problems of multi-cylinder hydraulic press and realize synchronous control.Finally,the performance of the system is verified by the co-simulation model of AMESim and MATLAB/Simulink.The main research contents are as follows:1.Aiming at the problem of disturbance,a super helix sliding mode repetitive control method under periodic disturbance is proposed.Based on the advantages of superhelix sliding mode variable structure control and repetitive control,a comprehensive control method is designed to improve the performance of superhelix sliding mode variable structure control system under periodic disturbance.The method is applied to the hydraulic system with periodic disturbance.The simulation results show that the method not only guarantees the stability of the system,but also realizes the accurate tracking of the position.2.The AMESim MATLAB /Simulink simulation model of single cylinder hydraulic press is designed.Aiming at the mathematical modeling of single cylinder hydraulic press system,the AMESim MATLAB/Simulink co-simulation research is carried out by using the traditional sliding mode variable structure exponential velocity trending law and improved sliding mode variable structure exponential velocity trending law as controllers,and the results are analyzed.3.In view of the complexity of the multi-cylinder hydraulic press system,the mathematical models of the whole system are established respectively,and the causes of the slider deflection are analyzed in depth.The control allocation method is used to solve the influence of high nonlinearity,redundancy and dynamic instability of multi-cylinder hydraulic press system on the control system,so as to realize the smooth operation of multi-cylinder hydraulic press.4.The AMESim-MATLAB/Simulink co-simulation model of five-cylinder hydraulic press is designed.In order to avoid large deviation between simulation and practice,a real-time feedback channel for forging deformation resistance is established.The simulation results verify the stability of the designed system,and achieve good control results in response speed and control accuracy.