直线电机和反力板间的垂向电磁作用力随气隙值动态变化，将其简化为特殊的线性弹簧。
The vertical electric magnetic force between LIM and reaction plate which dynamically varied with the air gap is simplified as special linear spring.
论文论述了景观动态的稳定性及作用力等基本概念，阐释了景观动态研究的三个主要理论，分析并讨论了景观动态的转移矩阵、模型等基本研究方法。
The theory explored the stabilities and acting force of landscape dynamic. The paper also explained the three principal theories and the simulation research methods of landscape dynamic.
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