Active Micro Vibration Control Research On Platform Based On Giant Magnetostrictive Actuators

In precision engineering and space engineering area, the internal andexternal disturbances in manufacturing and testing process seriouslyaffect the quality of product or test, so it is necessary for equipment toisolate and control the micro vibration interference. To solve the kind ofmicro-vibration problem, this thesis is a study on adaptive high precisiondisplacement driving and micro vibration control of platfom based ongiant magnetostrictive actuators (GMA). In the research, a series ofsimulations and experiments are carried out.Main Research of the paper is summarized as follows:(1)Firstly, controlled auto regressive moving average (CARMA)model and recursive extended least squares (RELS) algorithm are used todo the online identification of a GMA system. The identification modelcan accurately represent the output of GMA with different input currentsignals, and the error can reach to0.23%. Then, the modified generalizedpredictive control (MGPC) algorithm is designed to execute the highprecision displacement control of the actuator. Experimental results showthat MGPC method plays better real-time and efficiency than othercontrol algorithm. The MGPC method may achieve up to0.143umprecision by giving0-10um reference displacement.(2) Establish the dynamic model of GMA to illustrate that thestiffness of GMA is tunable. With analyzing and comparing the effect ofdifferent connection between GMA and passive isolator on theperformance, serial connection is selected and applied to the system.Finally the CARMA model and the MGPC algorithm are used in theGMA isolation system for the application of micro vibration control. Theresults of experiments show that the attenuation of vibration may reach up to20dB.(3) The3-d.o.f platform based on GMA is introduced and thedynamic model of the full-system is established. Then the simulation andopen-loop test of the system are carried out to verify the model. In the end,the MGPC algorithm based on CARMA model proposed in the researchis applied in the3-d.o.f GMA isolation system for the high-precisiondriving and micro vibration control of the platform. Simulation andpreliminary experiment results show that the adaptive control for the3-d.o.f system is also effective.