| Electromagnetic Rail-gun has very broad prospect as new weapon,but some key issues are still without solved.Rail-gun launch process is controlled by electric,it need huge power supply system and powerful control system to control the range precision and emission efficiency.But during the lunch process,the low frequency strong magnetic field transient strong electric field and strong electromagnetic radiation,would make serious interference to the power supply system and control system.So how to reduce the electromagnetic interference problem during the launch process of rail-gun and make anti-interference protection to the power supply system and control system,has been a key issue to the development of rail-gun.In this paper,the electromagnetic characteristics of rail-gun during the launch process and anti-interference technology are studied emphatically.Analyze and study the electromagnetic characteristics of the carrier end of the electromagnetic gun and the electromagnetic characteristics of the power supply system and propose the anti-jamming protection measures for the electromagnetic characteristics of the rail-gun,and verify the protect effect.In the research of rail-gun electric field characteristics,the simulation study of the skin speed effect of the carrier end of the electromagnetic gun show that:In the electromagnetic gun carrier end,due to the speed skin effect,the current distribution on the track and armature of the gun is mainly concentrated in the inner edge of the rail and the rear edge of the armature.Based on the dynamic changes of the electromagnetic gun load,The dynamic load power circuit model of the electromagnetic gun is established,Analysis of the power supply system of the normal operating characteristics and impact characteristics with overvoltage and overcurrent,Simulation analysis and experimental studies show that:Electromagnetic gun power system in the normal work to withstand high voltage and current,voltage peak can reach 10kV and current peak up to 65kA;When the power system impact is in the overvoltage and overcurrent,power system would suffer overvoltage up to 5?6kV and overcurrent up to 120kA.Research on magnetic field characteristics of Rail-gun,based on the current distribution on the rail and armature,build a model for the study of external magnetic field of external magnetic field,Simulation results show that:the magnetic field intensity at the radial direction 5m is small.The magnetic field characteristics of the tuning inductor in the power system are analyzed,A model for the study of the magnetic field of the modulated wave was established,Simulation results show that:Power system in the magnetic field 20?H plane spiral type inductor characteristics of the more prominent.The magnetic field distribution of the inductor is mainly concentrated in the inductor and the end face,the magnetic field strength up to 0.IT.On the basis of mastering the electromagnetic characteristics of electromagnetic gun power system,for the complex electromagnetic environment of the power system,put forward the protection of power system thyristor protection measures and power control system protection measures in this paper.,Simulation and experimental result show that:Thyristor protection measures can effectively limit the thyristor over-voltage and over-current,it can protect the thyristor.The magnetic field protection measures taken on the control system,it can make the average shielding effectiveness to 41dB,experimental result show that:The use of magnetic field shielding measures can ensure the control system work normally in the low-frequency strong magnetic field environment. |
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