Research On Modeling And Drive Control Of Giant Magnetorstrictive Actuator

Giant magnetostrictive material is a kind of functional material whichcan transfer electromagnetic energy into mechanical energy, it has theadvantages of large strain, fast response, good reliability and simple drivingmode, etc. It has broad application in the defense, industrial, civil and otherfields. Giant magnetostrictive actuator can be used in sonar technology, ultraprecision processing, linear motor, servo valve, active vibration control andother fields. But giant magnetostrictive material has the inherent nonlinearproblem, like hysteresis, which leads to the low control precision, seriousnonlinearity and poor reproducibility. In order to solve this problem, I usedthe actuator developed by my laboratory to research on the modeling andcontrol.The nonlinear error caused by hysteresis may reach up to20%. Tosolve such kind of problem for achieving reliable precision drivingperformance, giant magnetostrictive actuator needs to be modeled by aprecise and effective method which can be used in driving control. In thisarticle, Prandtl–Ishlinskii operator is proposed in this paper to model thehysteretic of actuator, and a real-time compensation control method basedon the operator is designed. The experimental results demonstrate thatPrandtl–Ishlinskii operator can accurately characterize the actuatorhysteresis, and the control method can effectively reduce hysteretic errorand improve real-time control accuracy, it’s a effective way to achieveprecision driving control of giant magnetostrictive actuatorA adaptive algorithm is used to control the actuator, in the research,Volterra series of different orders is employed to identify the actuator, theresult shows that Volterra series can accurately approximate the output signal, and the actuator’s nonlinearity is not so serious, linear model canachieve good precision. Then the Fx-LMS algorithm is implemented toexecute the displacement control of the actuator. During the experiment, anonline identification procedure is employed to reduce hysteresis influenceand improve the control precision of displacement driving of GMA.