Because of the meshing stiffness of a gear pair, the governing equation denotes a linear dynamic system with periodic time-varying coefficient.

由于齿轮副啮合刚度的影响，动力学方程序代表了一个具有时变系数的线性动力系统。

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By the discretization of spatial variable in the equation, a third-order differential system of equations containing periodic time-varying coefficient is derived.

采用微分求积法对方程中的空间变量进行离散，得到仅含有时间变量的三阶周期系数微分方程组。

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