摘要
打滑蹭伤是高速轻载滚动轴承经常发生的故障。在滚动轴承支承的高速转子系统中,常采用挤压油膜阻尼器(Squeeze film damper,SFD)来降低转子在超过临界转速时所产生的振动和噪声。挤压油膜阻尼器的存在对滚动轴承的打滑蹭伤必会产生影响,需要深入分析其影响机理以保障系统工作的可靠性。SFD通常是利用轴承在SFD结构中涡动来衰减振动。在基于轴承涡动轨迹假设基础上,建立涡动工况下的轴承滚动体运动学及动力学模型,分析不同外载荷、涡动半径、涡动频率等因素对轴承打滑的影响机理,完成挤压油膜阻尼器轴承的打滑失效分析。结果表明,在挤压油膜阻尼器轴承中,涡动的存在会对轴承的打滑产生不利影响;涡动的存在使得轴承的最小膜厚随时间振荡;增大外载荷、减小涡动频率和涡动半径都能改善轴承的运行工况。
Rolling element bearing skid damage frequently occurs in high-speed bearings when the load on the bearing is light. The squeeze film damper（SFD） is often adopted in the high-speed rotor system supported by rolling bearing to reduce the vibration and noise when rotor passing through critical speed. The effect of SFD on the bearing skid should be studied in order to ensure system reliability. The mechanism of SFD reducing vibration of machine is usually through whirling movement of its inner ring and bearing in its structure, then the kinematical and dynamical models of the whirling roller are developed based on the assumption of the orbit of bearing whirl, and the skidding damage of rolling bearing under various factors is investigated, and the skidding failure mechanism under various factors such as radial load, frequency and radius of whirling motion is investigated. The results show that adverse effects on skidding and fatigue life of bearing could be brought by whirling motion of bearing in SFD, and the existence of whirl causes movement instability and minimum oil film thickness oscillating with time. The deleterious effects could be reduced by increasing the radial load and reducing the frequency and radius of whirling motion moderately.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2013年第6期38-43,共6页
Journal of Mechanical Engineering
基金
国家自然科学基金资助项目(50935004
51175409)
