| Electromagnetic emission technology is a technique that uses electromagnetic force to accelerate an object,and it can propel the object to a very high speed in a very short time.Electromagnetic emission technology has the advantages of high export speed,clean energy,safety and reliability,and high emission efficiency.It has broad application prospects in defense military,aerospace,rail transit and other fields.Electromagnetic emission can be mainly divided into track type,coil type and reconnection type according to its principle and structure.Among them,coil type electromagnetic emission has attracted much attention because of its high efficiency and good functionality.However,coil-type electromagnetic emissions also have some shortcomings,such as flight stability problems and limited projectile structure.In view of the above problems,this paper proposes a sleeve-type rotationally accelerated electromagnetic emission mode based on the principle of coil gun.In this paper,the mathematical model of coil-type electromagnetic emission is established from the perspective of electromagnetic field and circuit.The dynamic characteristics of coil-type electromagnetic emission are studied,which provides theoretical support for the simulation study of coil-type electromagnetic emission.The two-dimensional transient model of coil-type electromagnetic emission is established by using finite element simulation software.The influence of structural parameters and electrical parameters on the launch performance is studied,which provides guidance for the optimal design of the sleeve-type rotationally accelerated electromagnetic launcher.On this basis,the launching process of sleeve armature and traditional armature is simulated and calculated,which proves that the launching mode of sleeve armature has high launching efficiency.Then the mathematical model of the rotationally accelerated electromagnetic emission is established from the perspective of electromagnetic field and the causes of thrust and torsion force are analyzed.The influence of voltage value,capacitance value and initial position of the armature on launching efficiency are analyzed by finite element software modeling and simulation.The simulation results show that the launching efficiency can be improved by appropriatly increasing the voltage and capacitance values,and the initial linear and angular positions of armature also affect the emission performance.In order to realize braking recovery of sleeve armature,an armature braking scheme based on the coupling effect between coils is proposed.The simulation results show that the scheme has high braking efficiency.Finally,a sleeve-type rotationally accelerated electromagnetic launching experimental platform is built and the launching experiment is carried out.The experimental results show that the rotational accelerated launch of the projectile can be realized by this launching mode.In addition,the experiment also verifies the influence of the parameters obtained in the simulation calculation on the launch efficiency and the influence of the coil connection mode on the armature deceleration efficiency. |
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