The typical polarized magnetic system has mainly four structures and its simplified equivalent magnetic circuit model is the base of the design of the electromagnetic relay.

典型的极化磁系统主要有四种结构，其简化磁路等效数学模型是继电器设计的基础。

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Making use of equivalent density the model is simplified effectively, a simple and feasible method is offered for mode estimation of a missile's large-scale finite-element model.

同时利用等效密度有效地简化模型，为导弹大型有限元模型的模态估计提供了一种简单可行的方法。

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The equivalent circuit for model parameter calculation is also given, so a calculation for complicated mechanism could be simplified to a electrical circuit calculation.

同时作出了模型参数计算的等效回路图，将复杂机械机构计算简化为电回路计算。

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