Research On Dynamic Surface Control Of Electro-hydraulic Servo Nonlinear System

For compressive stress test stand to the problems in a factory that the hydrauliccylinder displacement output not accurate and pin, hydraulic cylinder and products therest of the joint appear compaction force in a factory, and puts forward a new plan tosolve these problems, the electro-hydraulic servo system in place of the original openloop system in this paper, with electro-hydraulic servo system as the research objectwe set up mathematical model and to establish a state space model, a robust adaptivedynamic surface controller which is used dynamic surface control technology isproposed in this paper in order to make the system output can track the expectedreference signal and make the system the tracking error can converge to a small range.The dynamic surface control method which makes the virtual control via a first-orderlow-pass filter based on the development of backstepping from to overcome manydifferential term caused by backstepping from designed cotroller, and the controller hasbecome simple, and the tracking error is relatively small. We can see the whole systemin semi-global asymptote in the Lyapunov significance is stable by proving stability.The results meet the desired objectives by MATLAB software simulation. Moreover, Bythe input step signal with the traditional PID control comparison, the dynamic surfacecontrol overshoot decreased, and the system response speed is significantly improvedcompared to conventional PID control, and the dynamic characteristics superior toconventional PID control, but its robustness has yet to be experimental verification.We can approximate the uncertain parameters in the electro-hydraulic servononlinear systems by using fuzzy logic system in this paper, through a combination ofdynamic surface control technology, and select the appropriate parameters, makeelectro-hydraulic servo nonlinear systems in semi-global asymptotical stability in theLyapunov significance and the tracking error converge to a zero field. Simulationresults show that the tracking error was slightly lower than that using dynamic surfacecontrol technology system. And, through the step input signal and compared with thetraditional PID control, by comparing the found that dynamic level control overshootthan the traditional PID control greatly reduced, and the system response obviouslyimprove the speed, the dynamic characteristics is superior to the traditional PID control.Compared with the traditional PID control, the dynamic surface controltechnology can have a better development space for the future of industrial occasionsthat will need a lot of high precision, high response of the controller. Of course,developing the controller will also put into certain manpower material resources, it will bring on the economic cost of is improved.