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.

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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.

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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.

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