Research On Radiation Intensity Control Of Missile Tail Flame Simulator

Missile simulator is a kind of equipment which can simulate the related control principle and the important functions of missile system.In the actual work process,it is mainly responsible for the launch system of the missile detection,according to its running state to determine whether the parameters of the system is normal,while completing the training task of the system.The missile tail flame simulator is an effective simulation of the tail flame of missile.In the current military field,the importance of the tail flame in the missile system is self-evident.Because the tail flame will expose the missile’s location,the enemy will usually launches the investigation action according to this characteristic,therefore,reasonable design of efflux plasma can greatly reduce the risk coefficient of system,and the intensity of radiation is the key parameters to determine whether the tail flame easily detected,so the study of radiation intensity control method,has the vital practical significance.A complete missile tail flame simulator system is divided into four parts: optical system,infrared radiation source control system,radiation intensity control system and auxiliary parts system.In the radiation intensity control system,the voice coil motor is the core equipment that plays a driving role.It drives the opening and closing of the louver and regulates the rotation Angle of the louver to affect the radiation field of view of the radiation source(silicon molybdenum rod),so as to complete the control of the radiation intensity.Firstly,the paper introduces each subsystem of the missile tail flame simulator system,analyzes the voice coil motor in the radiation intensity control subsystem,and establishes the mathematical model.Then,the sliding mode control algorithm is introduced into the control system of voice coil motor,and the traditional sliding mode control algorithm is improved.Based on Matlab/Simulink platform,a control system of voice coil motor based on sliding mode algorithm is built.Through numerical simulation and verification,it is concluded from the numerical simulation experimental results that:Compared with PID and sliding mode position controller,the position control system of voice coil motor based on PI sliding mode algorithm can reduce the response time of position tracking by 85% and the steady-state error by nearly 50%,When the system reaches the steady state,the position tracking curve has no chattering phenomenon,and the steady state error is only0.01 mm.With faster response speed,superior dynamic performance and high steady-state accuracy.Thus,the position control precision of the voice coil motor control system is effectively improved,and the rotation Angle of the louver is driven more quickly.Thus,the radiation intensity of the missile tail flame simulator is accurately controlled.Finally,the hardware and software parts of the missile tail flame simulator are designed,and the experimental platform of the missile tail flame simulator is built.According to the index parameters of radiation intensity in the system,the reliability of the system is analyzed,and the simulation experiment for light spot is completed.It can be seen from the results that the actual radiation intensity of the system can fully reach the predetermined index and meet the demand.In the case of light spot of 3.5um-4.0um,the final radiation intensity of the system constructed in this paper is 21% higher than expected,while in the case of light spot of 4.5um-4.8um,it is 10% higher than expected.