Research On Acceleration Characteristics Of Projectile For Induction Coil Electromagnetic Launcher

Electromagnetic launcher is a kind of launching device which uses electromagnetic energy to generate the thrust.It is widely studied because of its high launch speed,good controllability,clean energy and easy access for it.Electromagnetic launcher has a wide application prospect in the military field,civil field and scientific research field.There are three types of electromagnetic launcher,including rail launcher,coil launcher and reconnection launcher.The coil-type launcher is a hot spot in the field of electromagnetic emission research currently.According to launch principle,the coil launcher can be divided into induction launcher and reluctance launcher.Induction launcher has the advantages of high energy conversion efficiency and large adjustable range of emitter mass.However,some key technologies of induction coil electromagnetic launchers are not mature enough.This paper starts with the impact of the driving current on the outlet velocity of the projectile,studies the acceleration characteristics of the induction coil electromagnetic launcher projectile in depth,and then optimizes the design of the multi-stage launcher and carries out corresponding experimental research.The details are as follows:(1)This paper introduces the classification and the basis of electromagnetic launchers,and then analyzes the principle,advantages and disadvantages of three launchers.At last,the research object of this paper is the induction coil electromagnetic launcher.(2)Based on the basic theoretical knowledge of induction electromagnetic launcher,the launch principle of induction electromagnetic launcher is analyzed first.Then the system circuit is analyzed and the force formula of the projectile is obtained,and the factors that affect the outlet velocity of the projectile are analyzed.Finally,the basic characteristics of the charge discharge circuit of the driving circuit are analyzed.(3)The impact of driving current on projectile outlet velocity is studied in depth,and the influence of the driving current on the acceleration characteristics of the projectile is summarized.Under a given power supply voltage,an optimal pulse width of the driving current can maximize the outlet velocity of the projectile,and the optimal pulse width isrelated to the power supply voltage.This paper uses Ansoft Maxwell simulation software to carry out relevant simulation analysis.The simulation results are consistent with the theoretical analysis.Then,the influence of the pulse width of the driving current on the outlet velocity of the multi-stage launcher is studied.The simulation analysis shows that the greater the speed of the acceleration coils at each level,the smaller the pulse width of the driving current required.Then,the simulation verifies and optimizes the outlet velocity of the multi-stage acceleration electromagnetic launcher.(4)Based on theoretical analysis,this paper designs a single-stage induction coil electromagnetic launcher,and compares the experimental results with simulation results.In order to further increase the outlet velocity of the projectile,this paper designs a two-stage induction coil type electromagnetic launcher based on the design of the single-stage induction coil type electromagnetic emission.The experimental results show that the two-stage electromagnetic launcher can significantly optimize the outlet velocity of the projectile.When the capacitor voltage is 380 V,after two-stage acceleration,the projectile outlet velocity can reach 5.1m / s.At the end of the paper,the previous work is summarized and the future work is prospected.