文中设计出镇定三阶切换系统的反馈控制律，并提出了解决二次镇定问题的直接算法。
The control laws, which stabilize the switched systems, are designed, and a straightforward computation algorithm for solving the quadratic stabilization problem isp.
本文以斜平面二次包络环面蜗杆副为研究对象，在空间啮合理论的基础上，推论出三参数修正的啮合方程、接触线方程、蜗轮齿面方程。
In this thesis, planar double-enveloping worm gear pairs is the research object, combined with space Meshing theory, derived from the multi-parameter modification of the mesh equation.
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