Research On Control Technology Of The Giant Magnetostrictive Actuator On Missile With Deflectable Nosecone

The the deflectable nose control is a new control method which can be applied to intelligent ammunition.Compared with other control methods,it has the following advantages: Compared with normal tail air rudder control,more static and stable lift can be improved;Compared with the front duck rudder control in the large Angle of attack,the static stability of the projectile is not easy to be separated by airflow;Compared with rotary wing control,it has better stability and control performance.The existing deflectable nose control actuator has motor drive,hydraulic drive,piezoelectric ceramic drive,etc.This paper choose the giant magnetostrictive actuator as the actuator,with large output force,high energy density and fast response speed,but the giant magnetostrictive materials as the core components of the giant magnetostrictive actuator have the characteristics of hysteresis and non-linearit.Simple PID control strategy is difficult to achieve precise control.On the basis of above,this paper does the following works:Firstly,we analyze the principle of the deflectable nose control,magnetostrictive effects and magnetostrictive properties.It describes how the deflectable nose control modification the projectile attitude and the principle of the displacement output of the supermagnetostrictive actuator under the action of magnetic field.The magnetic field process of the excitation coil in the giant magnetostrictive drive is analyzed and the mathematical model is established.Secondly,this paper use an improved model of the jiles-atherton model to simulate the magnetic hysteresis,to set up the Electric-magnetic-mechanical coupling model and use the finite element software COMSOL Multiphysics to establish A 2D axisymmetric model of the drive,The simulation results have practical significance for the design of the driver.Finally,this paper use Sheffield genetic toolbox to identify the parameters of J-A hysteresis model.Based on the modified J-A hysteresis model,driver dynamics analysis and amplification mechanism principle,the quasi static control model of the giant magnetostrictive actuator for the head deflection correction projectile is established.On this basis,the neural network feedforward inverse-PI controller is designed,and the tracking performance of the sinusoidal signal and the mixed signal test system is used respectively.The simulation results show that the system tracking performance of the neural network feedforward inverse-PI control strategy is good.