考虑表面粗糙度与轴瓦变形的水润滑轴承动力特性系数计算  

Calculation of dynamic characteristic coefficients of water lubricated bearing considering surface roughness and bush deformation

作　　者：冷子珺 吕芳蕊 焦春晓 塔娜[1,2] 饶柱石[1,2] LENG Zi-jun;LV Fang-rui;JIAO Chun-xiao;TA Na;RAO Zhu-shi(Institute of Vibration,Shock,Noise,Shanghai 200240,China;State Key Laboratory of Mechanical System and Vibration,Shanghai 200240,China;College of Mechanical and Electrical Engineering,Hohai University,Changzhou 213022,China)

机构地区：[1]上海交通大学振动、冲击、噪声研究所,上海200240 [2]上海交通大学机械系统与振动国家重点实验室,上海200240 [3]河海大学机电工程学院,江苏常州213022

出　　处：《船舶力学》2022年第1期38-49,共12页Journal of Ship Mechanics

基　　金：国家自然科学基金资助项目(11672178)。

摘　　要：本文在传统轴承动力学分析模型的基础上考虑了水润滑轴承轴瓦的刚度、阻尼和轴承质量以及可能存在的接触刚度、阻尼,推导了考虑表面粗糙度和轴瓦变形的扰动压力雷诺方程,对比了混合润滑模型与动力润滑模型、弹流润滑模型的轴承动力特性系数并分析其差异,研究了倾角、粗糙度等参数综合作用下水润滑轴承动力特性系数的变化规律。结果表明,最小膜厚比大于某一阈值时粗糙度增加可提高水膜动力特性系数,轴瓦变形会使动力特性系数减小,同时也会扩大使水膜刚度、阻尼获得增幅的粗糙度范围,但削弱了粗糙度对承载方向刚度、阻尼的增幅效果。此外,在承受载荷一定的条件下,粗糙轴承的动力特性系数在倾角较大时明显小于光滑轴承的对应值。The stiffness,damping of the water lubricated bearing bush,bearing mass and potential contact stiffness and damping were taken into account on the basis of traditional bearing dynamic analysis model in this paper.The Reynolds equations of the perturbed pressure considering surface roughness and elastic deformation of the bush were derived.The dynamic characteristic coefficients under mixed lubrication were compared with those under hydrodynamic lubrication and elastohydrodynamic lubrication,and numerical differences were analyzed.The variation laws of dynamic characteristic coefficients of water lubricated bearing under combined action of misalignment angle and roughness were studied.The results show that roughness enhances dynamic coefficients when the minimum film thickness ratio exceeds a threshold.Bush deformation reduces the dynamic coefficients and meanwhile expands the range of roughness which enhances stiffness and damping of the water film.However,the enhancement to the stiffness and damping in bearing direction brought by roughness is debilitated due to the deformation.Additional dynamic coefficients of rougher bearing become obviously smaller than those of smoother bearing at large misalignment angle for fixed-load condition.

关 键 词：水润滑轴承 动力特性系数 表面粗糙度 轴瓦变形 

分 类 号：O313[理学—一般力学与力学基础]