Numcrical calculations show that the impact compression effect of spring is important for dynamic strain of the fixed end.
分析结果表明，考虑弹簧冲击压缩效应与否，对弹簧固定端动态应变历程有很大影响。
A permanent magnet and a moving contact are fixed on a swing plate which can deflect, and the top end of the swing plate is hung on a coil brace through a spring.
永久磁铁和动触头固定在摆动板上，摆动板可偏转，顶端通过弹簧吊置在线圈支架上。
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