FE–BE Couple Method of 3D Electromagnetic Launch Dynamics Analysis

Railgun is one of the representatives of future launch technology, its dynamic simulation and design are key issues in engineering research. In order to solve the electromagnetic field evolution calculation problem during the dynamic launch process, based on the Maxwell equations of the quasi-static field, the governing equation of the three-dimensional transient eddy current field is derived with the vector potential A and the scalar potential φ as state variables. The solution domain and its surface are discretized using the FEM and the BEM, respectively. Solve the simultaneous FE and BE dynamic equations using the implicit difference scheme. Develop a transient dynamics solver for electromagnetic railguns to obtain the parameters such as current density, magnetic induction, and Lorentz force in the time domain. This method has been verified by commercial software, without to establish air domain grids, and has high calculation accuracy, which provides theoretical and technical support for the dynamic design of electromagnetic railguns.