当振管垂直立于磁场环境中时，在交变磁场的作用下产生磁致伸缩，即沿振管的轴向作简谐振动。
Vibration tube in the magnetic field vertically brings about magnetostriction under the effect of alternate magnetic field, that is axis resonance.
铁磁材料在交变磁场的作用下，产生的巴克·豪森效应，可作为无损检测材料残余应力的一种新方法。
Barkhausen effect is produced by ferromagnetic material under varying magnetic field, it can be used as a new method for nondestructive testing of residual stress.
针对电机的实际工作环境，研究了不同工作状态的磁体在交变磁场作用下表面磁感应强度随时间的变化。
The operating conditions in a permanent magnet were analyzed to quantity the magnetic induction changes on the surface with an alternating magnetic field.
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