通过式消磁实验中减小船模剩余纵向固定磁性的研究

Study of reducing ship models′residual longitudinal permanent magnetic field in overrun deperming experiment

为了研究通过式消磁的可行性,搭建了通过式消磁站1∶30的线圈系统简易缩比模型,进行了水面舰艇和潜艇船模的通过式消磁实验。初步发现,通过式消磁可以明显减小船模的固定磁性,但消磁后船模还存在一个较大的剩余纵向固定磁性,且方向始终朝向船模运动方向。理论分析和仿真计算发现,该问题是由垂向补偿线圈尾端产生磁场的较大纵向干扰分量引起的。为了解决这个问题,加入了纵向补偿线圈,产生一个纵向磁场抵消上述纵向磁场干扰。实验结果表明:加入纵向补偿线圈后,消磁后的船模剩余纵向固定磁性比加入纵向补偿线圈前要显著减小,在一定程度上改善了船模剩余纵向固定磁性较大的问题,从而改善了消磁效果。该研究结果对通过式消磁站的线圈系统工程设计具有一定的参考意义。

In order to study the feasibility of overrun deperming,a 1:30 scale model of the overrun deperming station is put up,whereby surface ship models and submarine models are depermed.The preliminary experiment finds that overrun deperming can obviously reduce the magnetic field of ship models,but a big residual longitudinal permanent magnetic field would still exist in the ship model after overrun deperming,and its direction is always the same as the direction of ship′s motion.Theore-tical analysis and simulation find that it is the big interferential longitudinal magnetic field made by vertical compensation coil which causes the problem.To solve the problem,the longitudinal compensation coil is added to produce the longitudinal compensation magnetic field.The experiment results show that the residual longitudinal permanent magnetic field with longitudinal compensation coil is obviously smaller than that without longitudinal compensation coil.Therefore,adding the longitudinal compensation coil can solve the problem to a certain extent and improve the result of overrun deperming.The finding of this paper is of some reference value with the design of the coil system of overrun deperming station.