Integrated Design And Control Of Ballistic Correction Projectile Electric Actuator

The trajectory correction projectile is widely concerned from all over the world because of its low cost and high accuracy. One demensional trajectory correction technique has been studied widely. Two-demensional trajectory correction technique is vigorously developed by many countries persently. Many researchers will focus on electromechanical actuator because of its good ability of correction and excellent control characteristics.This paper is based on the 120mm mortar projectile. Electromechanical actuator and control system are mainly studied. According to the design parameters and working principle, a method of 1/4 cycle ahead strategy was offered. Electromechanical actuator was designed, including 3K(II) type of planetary transmission and spatial linkage (RSSR mechanism).3K(II) type of planetary transmission ratio and efficiency were calculated, and geometric parameters of each gear were determined. The strength of every gear was checked in theory, and RSSR spatial crank-rocker mechanism was designed as the executive mechanism of electromechanical actuator. Three-demensional model of electromechanical actuator was built with SolidWorks, and its kinematics analysis was carried on ADAMS. Finite element strength analysis and modal analysis were carried on key components of the model. According to the work requirements, output torque and power of the motor were determined. With back EMF method, the control of sensorless brushless DC motor was realized. The double closed loop control system based on the principle of PID speed control was designed, and Simulink simulation of this system model was studied. TMS320F2812 chip was selected as the core of control system. Hardware circuit of control system was designed and some control units were programmed.