CAJ | 학술논문

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。
활동축승동력특성대선전궤계전자은정성유착중요영향。장CFD동망격기술응용우타원축승여원축승동력특성구해。재험증활동축승CFD동력특성구해모형준학성적기출상，건립기우CFD동망격기술적타원축승동력특성구해모형，분석타원도、편심솔이급전속등인소대활동축승동력특성영향，비교분석타원축승여원축승동력특성지간적차이。연구표명，타원축승여원축승적승재력여강도조니계수수착편심솔、전속적증가이증대；여원축승상비，타원축승량개유설형성량개류체동압구유효적증대축승적조니，활동축승증가타원도가제고전자은정성。
Dynamic characteristics of sliding bearings 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 bearings 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 bearings 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 bearings, the two oil wedges in the elliptical bearing generate two hydrodynamic lubrication zones which can increase the damping of the bearing effectively. Increasing ellipticity of the bearing can improve the rotor’s stability.