Strapdown Laser Semi-active Guided Missile Steering Gear Control System Design

Mortars have always played an important role in modern warfare.In recent years,countries around the world have applied precision guidance technology to traditional mortar shells,producing a series of low-cost,high-precision guided mortar shells.The rudder control system used to control the flight attitude and guidance accuracy of the projectile is very effective in actual combat.The effectiveness of ammunition has a very important impact.Based on the previous review of related literature and related research,this paper designs a rudder control system for strapdown laser semi-active guided mortars,integrates intelligent control algorithms to improve the control performance of the rudder,and applies it to dual-rotation guided projectiles.Ballistic correction in the terminal guided flight.First of all,after consulting the relevant information of the steering gear,the current research status and future development trend of the guided projectile and its steering gear control technology at home and abroad are explained.The permanent magnet synchronous motor that is widely used,has good control performance and is cost-effective is selected as the guided projectile.The steering gear body analyzes the working principle and mathematical model of the permanent magnet synchronous motor.Aiming at the performance requirements of the steering gear at low speed,the vector control method(FOC)is used to reduce the torque pulsation of the motor at low speed,and the space vector pulse width is studied.The principle of modulation technology(SVPWM)and its implementation methods,analysis of common motor rotor position detection technology and selection of mature Hall sensor detection methods,design vector control three closed-loop control system.Secondly,based on the time-varying and non-linear characteristics of the missile body’s flight system,based on the analysis of the classic digital incremental PID,the fuzzy control technology and the single neuron variable structure control technology are studied,and the classic PID is separated from the fuzzy control and the single The neuron variable structure control is combined to design a fuzzy PID controller and a single neuron variable structure PID controller,which are respectively applied to the velocity loop and the position loop that have a greater impact on the accuracy of projectile guidance.Establish a permanent magnet synchronous motor vector control model in MATLAB/Simulink and simulate the controllers using different control algorithms,and compare the simulation results to draw a conclusion: the controller combines the fuzzy algorithm and the single neuron variable structure algorithm to the step signal Faster response,small overshoot,good followability,strong anti-interference ability,which can improve the control performance of the steering gear.Finally,a set of steering gear control board and motor drive board with STM32F407 as the main control chip are designed,and the steering gear control program is programmed by software,and the application of the steering gear control is realized by the controller algorithm before and after the improvement.Experiment with the above-mentioned steering gear on the ground semi-physical simulation platform and conduct data analysis.By analyzing the parameters of the steering gear collected by the host computer,it is verified that the designed steering gear control system has good controllability.