本文应用微分方程的定性方法，给出具有间隙动力系统产生自激振动的一个充分条件。
In this paper, the sufficient condition for self-excited oscillation of dynamic systems with gap is given by using qualitative method of differential equations.
结论充分利用适当的手术间隙，保护好下丘脑的结构和穿通动脉，可以降低下丘脑损伤的发生率和提高肿瘤的切除率，获得良好的疗效。
Conclusion Making full use of operating Spaces and protecting hypothalamic structure and artery branches may lower the incidence of injury to hypothalamus and achieve good surgical results.
建立了叶轮间隙和迷宫密封的整体模型，并充分考虑了叶轮两侧密封对轴向推力的影响。
Whole model of impeller clearance and labyrinth seal are built up, and the effect of seals with two sides of impeller to axial thrust is considered fully.
如果间隙值大，那么在碰撞产生之前，机器人有充分的反映时光。
If the clearance value is high, then the robot has enough time before collision.
对牙轮和牙齿分别进行了装配，为三维啮合间隙计算做了充分准备。
Assemble inserts and cones respectively, and prepare for calculating 3d engaging distance of tri-cone rock bit.
对牙轮和牙齿分别进行了装配，为三维啮合间隙计算做了充分准备。
Assemble inserts and cones respectively, and prepare for calculating 3d engaging distance of tri-cone rock bit.
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