Stdy On Model Reference Adaptive Control Of Electro-Hydraulic Vibration Testbed

As a standard test apparatus which is used to check and appraise most engi- neering equipments or equipment's mechanical property,the electro-hydraulic vibration testbed become very important by most countries in the world. The shacking table electro-hydraulic sevo system is a time-variant nonlinear nondete- ministic system with many influencing factors which is parameter-variant, external disturbance and so on.It's very difficult and complex to control the vibration spectrum accurately.As a widespread control method,using typical method of linearization of action spot,the effect of PID control depend on the accuracy of linearization and the position of action spot.If the action spot changed,the parameters or structure of controller need to reset,the system's robustness is not good enough.In view of the above questions,the article introduce the model reference adaptive control(MRAC),which is designed basted on the adjustable gain, generalized error and Lyapunov stability theory. In this theory,not only could we design the adaptive control system depending on input and output of plant(or adjustable system) but also could we ensure the system's stability and enlarge the disturbed parameter setting area.By simulation and test analysis, comparing with the control effect of MRAC controller and PID controller,for overcoming hydraulic system'non-linearity and compensating non-linearity alteration of system characters(procedure parameters) ,MRAC controller than PID controlle with better stability, robust-ness and adaptability.