Accelerated Calculation and Analysis of Multi-stage Coil Gun Model Based on Current Filament Method

Based on the mathematical model of the current filament method in induction coil gun, the factors of inductance matrix in the mathematical model are studied. The schemes of sparsing mutual inductance gradient matrix and inversing the matrix by block iterative and order reduction are used to shorten the time of the current filament method simulation model while maintaining reliability. In order to verify the validity and reliability of the improved current filament simulation model, the 25-stage, 50-stage and 100-stage induction coil guns are taken as the research objects respectively. The results of the current filament method simulation model before and after improvement are compared. The effectiveness and reliability of the improved current filament method are verified. In order to further study the influence of the sub-schemes, the 50-stage and 100-stage induction coil guns are taken as the research objects, and the influence of each sub-scheme is analyzed by the control variable method. It can be seen from the results that inversing the matrix by block iterative and order reduction is better than sparsing mutual inductance gradient matrix in shortening the time of the simulation model.