Research On The Influence Of The Magnetic Field Environment Of The Round-bore Four-rail Electromagnetic Gun On The Missile-borne Wireless Signal Emission Detection System

Equipped with lower current density and higher launch efficiency,round-bore four-track electromagnetic guns surpass the normal ones and become research hotpots.The magnetic field environment in the bore of round-bore four-track electromagnetic guns will cause strong magnetic interference to the missile-borne remote control systems.Therefore,it is necessary to first analyze the magnetic field environment of the smart ammunitio n part of the round-bore four-track electromagnetic guns and study the corresponding magnetic shield design to ensure that the missile-borne remote control systems can work normally.Research goals of this paper: to commence,grasp the mechanism and electromagnetic characteristics of the magnetic field generated during the launch of the electromagnetic railguns,establish a structure model of the round-bore four-track electromagnetic guns,and understand the magnetic field distribution in the bore.Besides,Evaluate the impact of the magnetic field environment of the smart ammunition in the bore on the missile-borne wireless signal emission detection system.Eventually,according to the launching environment of the round-bore four-track electromagnetic cannon,an appropriate missile-borne wireless signal transmission shielding protection system is designed.The strong magnetic field emission device was used to simulate the magnetic field environment to verify the actual shielding effectiveness of the shield body and the feasibility of the principle prototype of the wireless signal transmission system.The main research work of this paper is as follows: to commence,based on the round-bore multi-track electromagnetic launch model proposed by IGENBERGS E,this paper uses Maxwell software to establish a three-dimensional model of a round-bore four-track electromagnetic guns for the first time.The results show that the radial current on the surface of the armature is more concentrated in the front 7.5mm of the armature.Therefore,this paper focuses on the three-dimensional finite element analysis of the magnetic field of the intelligent ammunition electronic head at the front of the armature.The research shows that the magnetic field at the front of the armature has the characteristics of rapid radial attenuation and low magnetic flux density in the bore;the peak value of the magnetic field at the position of the electronic head can reach 0.53 T,and the strong magnetic field is mainly concentrated at the front 40 mm of the armature.Besides,the shielding effects of single-layer shields and multi-layer shields composed of different shielding materials are also studied on the basis of the analysis and grasp of the strong magnetic field environment where the electronic head of the smart ammunition is located.And the effect of the through-hole shape on the shield on the shielding effectiveness is mainly studied in the paper,considering that antennas often appear in the smart ammunition detection systems.The final shield design uses round through holes,with the inner layer made of mumetal material and the outer layer made of steel 1008 material.Additionally,the magnetic field environment of the area,in which the antenna is to be placed,is analyzed,the design ideas for the operating frequency band,chip selection,and circuit board layout of the wireless signal transmission system are proposed.According to the requirements of the magnetic field shielding effectiveness measurement experiment,a prototype of the wireless signal transmission principle of the missile-borne detection system,based on the established shield structure,is designed,which includes a main control module,a radio frequency module,a power amplifier module,and a power module.Through debugging in the field,it is proved that the prototype system has the required functions for experiments.Eventually,the following experiments were performed using a strong magnetic field generator to simulate the magnetic field environment of a four-track electromagnetic guns.The experiment includes the anti-interference ability of the circuit board of the prototype,the shielding effectiveness measurement of the shield,the communication experiment of the prototype of the wireless signal transmission system,the shielding effectiveness of the shield was be measured and the experiment of overall prototype feasibility was be tested.As the experimental result shows,the prototype of the principle of the wireless signal transmission system,under the protection of the designed shield,can quickly and accurately send relevant measurement data to the ground receiving station.