The vertical electric magnetic force between LIM and reactionplate which dynamically varied with the air gap is simplified as special linear spring.
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。
2
It is driven not by the adhesion force from the contact between wheel and rail, but by the electromagnetic force from reactionplate which is mounted in track.
它不是由轮轨间的粘着力驱动，而是由安装在轨道的反应板产生的电磁推力驱动的。
3
Conclusion Considering source of transplanted material, reparative effect and adverse reaction, repair of injury of growth plate with tissue engineered cartilage deserves further investigation.