本文系对中等长度(油膜周长和轴向长度相近)圆柱形挤压油膜阻尼装置,讨论其对振动体绕中心的摆动的阻尼作用,考虑到此时油膜厚度同时为周向坐标和轴向坐标的函数,给问题求解带来一定复杂性,采用了摄动法,取表征中心摆动的无因次小参数作为摄动参数,求解相应的雷诺方程,给出近似解到摄动参数的三次幂项为止,并导得油膜阻尼力矩的相应表达式和线性化后的粘性阻尼系数。 In this paper, the medium-length (oil film perimeter and axial length similar to) squeeze the oil film damping device to discuss its vibration around the center of the body vibration damping effect, taking into account the film thickness at the same time for the circumferential coordinates and axial The function of coordinate, which brings a certain complexity to the solution of the problem, uses the perturbation method to take the dimensionless small parameter of the characterization center as the perturbation parameter to solve the corresponding Reynolds equation and gives the approximate solution to the perturbation parameter three times Power term, and leads to the corresponding expression of oil film damping torque and linearized viscous damping coefficient.