Control Principle And System Design Of Ballistic Correction Mechanism

Two-dimensional trajectory correction mechanism is a kind of complex electromechanical integration system,is also a kind of high precision position server system.In the attitude control of two-dimensional correction projectile,It is the most important part of the correct projectile.But having control difficulties,low defect correction accuracy correction mechanism modified by adding correction projectiles,in order to improve the control performance of the trajectory correction mechanism,this paper based on the basic principles of trajectory correction and the stress analysis of trajectory correction steering,designed the closed-loop control system based on permanent magnet brushless DC motor,and through simulation experiments verified the feasibility of the correction mechanism and reliability of the control strategy designed in this paper.In this paper,it proposed a scheme of two-dimensional trajectory correction by the research of the trajectory correction technology and development status on the domestic and foreign,and identifid the trajectory correction institutions basic working principle and overall structure layout.According to the circumstance of fixed by actuator torque,the paper identified the preliminary control scheme of the correction mechanism.By the analysis of the moment of the modified projectile at different time,the paper determined the calculation formula of the output electromagnetic torque of permanent magnet motor in the modified mechanism.First,according to the restrictions of high-speed rotation projectile,the paper designed structures and overall layout to meet the requirements of a two-dimensional trajectory correction mechanism,analyzed the factors affecting the electromagnetic torque ripple and reduced motor output electromagnetic torque luctuation in terms of cogging torque;Second,the paper put forward the double closed-loop control strategy of permanent magnet motor and the roll angle control model of the steering gear and based on the servo control schemeof the permanent magnet brushless DC motor,designed part of the peripheral hardware circuit,including motor driver based on DSP2812,signal detection ect.Then,on the basis of hardware circuit,completed the software program design of trajectory correction system and tested the feasibility and application of the whole system combing with the hardware circuit;Finally,according to the principles of two-dimensional correction and the aerodynamic analysis of high-speed stability projectile,build the two-dimensional correction ground simulation prototype.For High overload and high-speed of high-speed rotating bomb and small space within bombs,the paper proposed two methods of string armature circuit resistance and chopper,completed the regulator of amendment electromagnetic motor torque and speed.Through the ground simulation test rig for motor torque measurement and motor rotor position detection experiment,it further analysed of these two programs on regulatory effect correction actuator torque and rotational speed,and finally carried on the motor rotation reduction,positive and accurate control of the stop angle and other experiments,and ultimately determined the chopper control for the optimal control method of trajectory correction by comparing to the experimental results of the two methods.