摘要
滑动轴承动力特性对旋转机械转子稳定性有着重要影响。将CFD动网格技术应用于椭圆轴承与圆轴承动力特性求解。在验证滑动轴承CFD动力特性求解模型准确性的基础上,建立基于CFD动网格技术的椭圆轴承动力特性求解模型,分析椭圆度、偏心率以及转速等因素对滑动轴承动力特性影响,比较分析椭圆轴承与圆轴承动力特性之间的差异。研究表明,椭圆轴承与圆轴承的承载力与刚度阻尼系数随着偏心率、转速的增加而增大;与圆轴承相比,椭圆轴承两个油楔形成两个流体动压区有效的增大轴承的阻尼,滑动轴承增加椭圆度可提高转子稳定性。
Dynamic characteristics of sliding beatings have important effects on stability of rotating machinery rotors. In this paper, the dynamic mesh technology in computational fluid dynamics （CFD） was applied to analyze the dynamic characteristics of elliptical bearings and cylindrical bearings. On the basis of verifying the accuracy of the CFD model for the sliding bearings, the CFD models of the elliptical beatings and cylindrical bearings were set up for dynamic characteristics analysis based on the dynamic mesh technology. The effects of ellipticity, eccentricity and rotational speed on the dynamic characteristics of the sliding beatings were analyzed. The difference of the dynamic characteristics between the elliptical bearings and cylindrical bearings was analyzed. The results show that with the increasing of the eccentricity and rotational speed, the stiffness and damping coefficients of both the elliptical and cylindrical bearings increase. Compared with the cylindrical beatings, the two oil wedges in the elliptical beating generate two hydrodynamic lubrication zones which can increase the damping of the beating effectively. Increasing ellipticity of the bearing can improve the rotor＇ s stability.
出处
《噪声与振动控制》
CSCD
2015年第4期1-5,共5页
Noise and Vibration Control
基金
国家自然科学基金(11302133)
辽宁省教育厅基金(L2013071)
关键词
振动与波
椭圆轴承
圆轴承
动力特性
CFD
动网格
vibration and wave
elliptical bearing
cylindrical bearing
dynamic characteristics
CFD
dynamic mesh
