分析了含间隙运动副副元素的碰撞分离过程，指出线性弹簧阻尼模型不能满足接触边界条件并产生力突变；

This paper points out the disagreement of boundary conditions that generate force discontinuity in the linear spring damping contact model by analyzing the contact modulation of the clearance joint.

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副上鞋器由副安装座、轴、锁闭销、锁闭套和上鞋弹簧组成。

The auxiliary shoe-fixing apparatus consists of auxiliary mounting base, shaft, locking pin, locking sleeve and shoe-fixing spring.

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弹簧板材儿童眼镜架MG003，颜色可以自选，起订量300副，脚丝外侧有雕花。

Children with a spring plate frame, color can be choice, MOQ 300pcs, feet outside of a carved silk.

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