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More Than 10,000 Tons Forging Hydraulic Press Horizontal Splitter System Modeling And Control Strategy

Posted on:2009-10-02Degree:MasterType:Thesis
Country:ChinaCandidate:C P ZhaoFull Text:PDF
GTID:2191360245983925Subject:Control Science and Engineering
Abstract/Summary:PDF Full Text Request
The 10,000 ton multi-ram die-forging water press is the pivotal equipment to machine large high-strength aluminum alloy components of spacecraft and aerocraft. The former operation system of the machine is obsolete and the reliability can't be guaranteed. The entire operation system is updated to digital electro-hydraulic sever-control system. The electro-hydraulic sever-control system of horizontal dispensing equipment as research object is modeled and analyzed by simulating. The control strategy is studies to enhance work accuracy and reliability.According to the characteristics and working principles of water press horizontal dispensing equipment, the composition and functions of hydraulic system and electrical system of the new control system are introduced in detail. The mathematical models of main elements in the electro-hydraulic position servo system of horizontal dispensing equipment, such as proportional flow valve, cartridge valve, servomotor, are established. The characteristics of main elements are analyzed, according to simulating results by using MATLAB/Simulink software. Then the complex simulation model is obtained by packaging. The simulating results reflect the system without controller have very serious overshoot and long regulation time, particularly in large load situation the system oscillates more serious, which can not meet the need of industry and could damage dispensing equipment.Aiming at the problems that the electro-hydraulic system is nonlinear and the parameters are uncertain, PID controller can not achieve the good effect in production, an adaptive inverse controller based on neural network is designed. The neural network as a feedforward controller adjusts itself online according to the PID controller's output and to eliminate the feedback error gradually. The PID controller as a feedback controller eliminates the effect of load. This controller not only has guaranteed stability and robustness, but also enhanced precision and self-adaptive ability of the control system. The results of simulation and Field experiment show the control strategy is superior.
Keywords/Search Tags:water press, electro-hydraulic servo system, adaptive inverse control, orthogonal neural network
PDF Full Text Request
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