Design Of Steering Gear Control System For Guided Rocket And Experimental Study

Various types of rockets with precise guidance performance can play an important role in modern or future wars,so improving the guidance accuracy of various types of rockets has always been a hot issue of concern.However,the speed required by the projectile body of each type of guided rocket in different time periods during the actual launch and flight process is different,and the change and fluctuation of speed will have a certain impact on the steering gear control accuracy of the guided rocket,which will indirectly affect the guidance effect of the guidance device in the missile and reduce the hit accuracy of the rocket.Although a number of methods have been adopted to improve the guidance accuracy of guided rockets,and certain results have been received,there is still room for improvement.This is because the traditional PID control method and multi-sensor feedback system are difficult to meet people’s control needs for high-precision guided rockets,and many accidental factors in practical applications will eventually affect their precision strikes on the target.Therefore,this paper proposes a guided rocket servo control system using PMSM sensorless vector control mode.This article first introduces the relevant technology of PMSM sensorless vector control method.After comparing the applicability of various methods,it was decided to design the guided rocket steering gear control system to adopt the PMSM high-frequency pulse voltage signal injection method at low speed stage and the PMSM modified sliding mode observer method at high speed stage.Then the overall design of the guided rocket servo control system is carried out,and the design control system is composed of a control module,a driver,a sensor module and a steering gear and a lower servo,and the upper and lower servo machines are all selected from surface-mount permanent magnet synchronous motors.The improved sliding mode observer control is adopted for the upper steering gear,and the high-frequency pulse voltage signal injection control is adopted for the lower steering gear.After mathematical modeling,the simulation model is built in Matlab/Simulink software,and the simulation results show that due to the easy implementation of the sliding mode observer method and its robustness,but the servo has the problems of phase delay,jitter vibration and estimation accuracy in lowspeed operation;and injecting a high-frequency sinusoidal voltage signal under the synchronous rotation coordinate system can greatly improve the disadvantages of the sliding mode observer in the low-speed segment,and accurately calculate the rotor position speed information,which forms a strength avoidance and complementary advantages.Highperformance control of the steered rocket servo control system is realized.Subsequently,the steering gear control system based on the DSP TMS320F28335 was designed,and the corresponding hardware and software designs were given.The system hardware consists of a control part and a drive part.The control part includes a DSP core control module,an A/D collection module and a numbered data signal conversion module;the driving part includes a power supply module,an IPM module and a driving circuit.In terms of software,the development and design process of the DSP system is mainly explained,and the structural characteristics of the system are analyzed in detail.Finally,matlab/GUI software is used to design the host computer,and the control accuracy test of the designed guided rocket servo control system is carried out.By testing the control performance of the upper and lower steering gears with high and low speeds,and testing the control performance of the entire set of steering gears at different speeds,the results show that the control performance of the steering gear control system at different speeds is high,which meets the basic requirements of the steering gear system and fully proves the feasibility of the scheme proposed in this study.