调弱挑线弹簧的张力，调大动作行程。
Decrease the tension and increase the stroke of the thread take-up spring.
挑线弹簧的回复力过强。
The returning force of the thread take-up spring is insufficient.
本文用等效线弹簧模型计算裂纹转轴的动力稳定性问题。
In this paper, the equivalent line-spring model is employed to study the dynamic stability of a rotating cracked shaft.
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