Design And Test Of Actuator Based On Ultrasonic Motor Braking Mechanism

Guided projectile is a kind of new type of ammunition which has the guidance function without changing the traditional projectile firing form.In this paper,a high rotation guided projectile rudder unit based on the mode of ultrasonic motor braking is proposed for the urgent demand of the national guidance projectile.Based on the friction braking of the ultrasonic motor,a scheme of rudder unit is designed,which can be used for the speed control of the rudder of high rotating carrier,and has the characteristics of fast response,high resolution and no electromagnetic interference.A friction kinetic model based on the feed mode of ultrasonic motor is established in this paper,the simulation analysis is carried out,a variety of test platforms are built,and the machining prototype is assembled and tested.The main research contents of this paper are summarized as follows:1.This paper introduces the concept and principle of the guided projectile,analyses the present situation at home and abroad and analyzes the advantages and disadvantages of each type of guided projectile,the characteristics and performance requirements of rudder control for high rotational projectile are pointed out,and the concept and development of the piezoelectric actuator are introduced.Meanwhile the research objective and main contents of this paper are pointed out.2.The friction model and braking model of contact interface are established.The initial test platform and GDD test platform are built.The experimental analysis is carried out,and the braking deceleration effect and performance of the mechanism are studied.3.A micro-displacement amplification mechanism based on triangular amplification principle is designed and the principle of the actuator is analyzed.And the flexure hinge model and braking model are established.The finite element simulation and experimental analysis of the mechanism are carried out,the modal and stress are simulated,and the electromechanical characteristics and dynamic characteristics are tested experimentally.Combining with the ultrasonic motor,the macro-micro-integrated experimental platform is built;the effect of braking speed control is analyzed experimentally.4.In this paper,a set of actuator system components is designed for the canard configuration,and the three-dimensional model is built;the integrated design and assembly of each device is made.The dynamic model of actuator and its characteristic simulation are established,the whole working process is analyzed in detail,and the experimental system is built.