The Circuit Transient Characteristics Analysis And Optimization And Analytic Calculation Of Transmitting Module Of Electromagnetic Railgun

As a new concept weapon, electromagnetic emission device has a broad prospect ofapplication in the military and the scientific research fields. It is because of great potentialof development, the research of further in the theory and the application has attractedmany countries. Because the electromagnetic emission device is a high-speed slidingcontact under the stress field, thermal field and electromagnetic field coupling effect ofcomplex system influence. Presently, it is considerable difficult to master entire systemphysical processes of electromagnetic emission device system.In this paper, we mainly study the transient basic characteristics of the circuit, theoptimization of the launch components important parameters and the analytic solution ofinternal surface of launcher's barrel subjected to three times function distributionpressures of the electromagnetic railgun.Firstly, paper considers the three transient process including owes damping, overdamping and critical damping on the basis of the electromagnetic railgun circuit'stransient characteristics. Variation relation of the railgun to the storage capacitor voltage,the discharge circuit current and the armature back electromotive force are analyzedrespectively the inductance gradient, the loop inductance and capacitance by the numericalsimulation results.Secondly, the speed of launched projectile is one of the most important parameters ofthe railgun design, in order to exploring the influence of speed of projectile launchedabout the spacing and height of the rail and drive current, so it got the optimum speed ofprojectile is meaningful. The optimization model that it will optimize calculation in usingnewton method among armature speed, drive current and the spacing and height of the railwas established in paper on the basis of the plasma armature movement by the viscousdrag and inertial drag. The optimization results showed that adjust to the height of the rail,between two rails distance to reach to purpose that it adjust launched speed of projectile.Finally, the accurate calculation of force-deformation of the electromagneticlauncher's barrel can help to extend the barrel life and improve the firing accuracy. Therefore, a stress function which meets both the biharmonic equations and boundaryconditions is constructed in the three-dimensional space in paper. Furthermore, theanalytic solution of barrel subjected to three times function distributed variable pressurewith plasma armature is deduced. When strain values of a barrel are recorded by staticstrain tester on REG-III electromagnetic launcher's barrel, the experimental results are inaccord with the theoretic calculation.