Novel Piezoelectric Actuator And Its Application In Miniature Missiles Servo System

The micro missile not only inherits and retains the advantages of the traditional missile,but also has high efficiency cost ratio and good concealment.It is a single soldier carrying device that can support the launch of hand-held launch,UAV launch and other multi-platform launches,which will play an important role in the future battlefield.However,the actuator system of micro missile is not the replication and miniaturization of the traditional actuator system,but the extension and development of the actuator technology in smaller space,lower cost and higher requirements.At present,electric actuator is used in the design of micro and small actuators all over the world,but there are problems such as low control bandwidth,electromagnetic interference and there are many transmission components,which are difficult to realize miniaturization.In this paper,a new type of rudder surface driver based on piezoelectric bimorph to realize the rudder surface deflection of miniature missiles is proposed.It further explores its mechanical properties,methods to further enhance the driving performance,and the hysteretic nonlinear control of piezoelectric bimorph.The study provides a feasibility basis for the application of piezoelectric actuators in the steering system of miniature missiles.In this paper,a piezoelectric actuator is designed by theoretical and simulation methods,that is,the supporting mode and electrical connection mode of piezoelectric bimorph,and its static and dynamic characteristics are studied;a kind of rudder surface actuator suitable for the limited internal space of micro missile is designed preliminarily,and the driving ability of the actuator is further improved by the method of superposing piezoelectric bimorph,so that it can meet the requirements of miniature missiles servo system.This paper proposes a solution to realize the retraction and release of rudder surface,which improves the portability of micro missile and realizes the carrying of individual backpack.The hysteresis nonlinearity and the asymmetry of hysteresis loop of piezoelectric bimorphs are studied.Based on the classic Bouc-Wen model,an improved Bouc-Wen modelis proposed,and the main parameters of each model are identified by analytic method and particle swarm intelligence algorithm,and the simulation results show that the improved Bouc-Wen model can describe the hysteresis nonlinear characteristics of piezoelectric bimorphs more accurately.In order to realize the linear control of the micro missile rudder actuator and eliminate the influence of the hysteresis nonlinearity on the control accuracy,a compound controller based on the improved Bouc-Wen inverse model of feedforward control and PI feedback control is designed,and the displacement tracking simulation test of the control loop of the piezoelectric bimorph is carried out to verify its signal tracking under the action of a variety of single,composite frequency reference input signals Tracking ability and resistance to external random interference.