感应线圈炮电枢的磁-结构耦合分析

Magnetic-Structural Coupling Analysis of Armature in Induction Coil Guns

电枢是感应线圈炮的关键部件,其在工作过程中易发生破坏。为了设计高强度的电枢,以保证感应线圈炮实验研究的顺利进行,建立了电枢磁-结构耦合过程的数学模型;用有限元仿真程序建立了感应线圈炮的仿真模型,并对所建模型进行了仿真,得到了电枢的涡流、电磁力、变形及应力分布规律;分析了电枢后端部壁厚变化对电枢应力的影响规律。结果表明:电枢的涡流密度、所受电磁力和结构变形在电枢的后端部最大,最大应力值位于电枢后端部内侧,并且随着电枢壁厚的增加,电枢的最大应力值逐渐减小,故在设计电枢时其后端部应采取加固措施以提高电枢的强度。

Armature is a key component in induction coil gun and it would be destroyed by enormous electromagnetic force in the working process. It is necessary to design armatures of high strength in order to further investigate the test of induction coil gun. Mathematical model of magnetic-structure coupling of the armature was built. With finite element analysis code, magnetic-structure coupling analysis was accomplished for the purpose of analyzing distribution laws of eddy, magnetic force, deformation and stress. The varying laws of stress in armature resulting from the thickness changing was analyzed. Simulation results show that the non-uniform distribution of magnetic flux density and eddy in armature occurs and the maximum value of magnetic flux density, eddy, magnetic foerce and deformation lies in the tail of armature. The biggest stress occurs at the inner side of cylinder armature tail and the biggest stress decreases with the thickness of armature tail increasing. In the engineering project, the reinforcement of the armature mechanical strength should be designed to improve the performanee of induction coil gun.