Numerical Analysis of Magnetic-Structural Coupling for Electromagnetic Rail Launcher Based on Contact Algorithm

Aiming at the loading problem of electromagnetic force in structural analysis for the electromagnetic launcher and the untrue phenomenon obtained by common node method, a contact algorithm mixing multi-point constraints with augmented Lagrangian is proposed for numerical analysis of 2D magnetic-structural coupling for the electromagnetic rail launcher. Results indicate that the changing trends of the electromagnetic force on the rails and the maximum magnetic flux density are similar to that of the loading current. Material matching affects the dynamic response of the launcher greatly. This method results in loading on the rail more reasonably and avoiding the untrue tensile stress at some conjoint areas. A useful method for structural analysis of the electromagnetic launcher is provided.