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.
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.
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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