Vibration Control Of Flexible Missile Based On Function Observer

TThe smaller the cross sectional area of missile body,the longer the length,the greater the long diameter ratio,the better the performance of missile’s maneuverability,speed and range.But the longer diameter ratio is larger,when the length-diameter ratio is greater than 15 o’clock,the flexural vibration of the missile in high speed flight can’t be neglected,and the elastic characteristic of the projectile is more obvious.At the same time,this local motion(elastic vibration)of the missile affects the whole of the projectile,such as the performance of the missile can affect:reducing the control precision and stability of the projectile control system,causing the accuracy of the instrument and equipment to decrease,affect the missile’s speed,precision and maneuverability,and cause the missile to disintegrate seriously.Therefore,it is important to study the elastic characteristics of the projectile and to reduce the vibration of the elastic vibration of the projectile.In this thesis,a new active vibration control method is designed for the control system of Flexible missile,which mainly completes the following tasks:Firstly,according to the data,the vibration control system of the Flexible missile is understood,and the mathematical model of the elastic perturbation motion of the elastic Body missile is analyzed,and the state space expression is obtained.Secondly,the active vibration control method of the Flexible missile is designed.See the missile as a rigid-flexible coupling system,an active vibration damping controller is designed by using function observer and State Observer,based on Servo compensator,the whole-dimension dynamic output feedback control law of augmented controlled object is constructed,the transition process is optimized by using the region pole collocation method,and the linear matrix inequality is used to solve the optimization problems.Design the control system scheme of the Flexible missile.Finally,three kinds of control methods are compared with their advantages and disadvantages by simulation,and the damping effect is analyzed.The effect of the control method based on function observer is similar to the other two,but the whole dimension of the controller is low,which has advantages in the complexity of the structure.In this thesis,the research on the damping controller of the Flexible missile is integrated with various control theories:the function observer can obtain the state signal,which can solve the problem that the pitch angle cannot be detected accurately on-line,and the structure is simple,and the servo compensator realizes the zero-static error control tracking,eliminating the external unstable part;active vibration control,Damping is controlled from the angle of vibration rather than as a disturbance.