摘要
以梯形滑梁式空气箔片轴承为研究对象,依据Kirchhoff理论建立顶箔有限元模型,结合梁的大变形方程和最小位能原理对滑梁进行力学分析,实现对顶箔、滑梁及滑梁周围框架结构的形变计算.引入Reynolds方程构建流固耦合计算模型,用于分析润滑性能.通过MATLAB编程实现对气膜压力、气膜厚度、轴承摩擦力矩和端泄量的计算,并通过试验验证计算模型的可靠性.结合具体算例,针对标准气膜厚度、滑梁长度、滑梁宽度、滑梁斜率、底箔厚度和顶箔厚度对轴承润滑性能的影响进行数值研究.结果表明,随着轴承与转子初始间隙的增大,气膜动压区域减小,气膜的最大压力上升,摩擦力矩减小,端泄量增大;滑梁对顶箔的支撑不连续,导致气膜压力和气膜厚度分布不连续;调整滑梁尺寸和底箔厚度会改变滑梁对顶箔的支撑刚度,当滑梁对顶箔的支撑刚度增大时,气膜厚度减小,气膜的最大压力增大.
A finite element model of top foil for trapezoidal sliding beam air foil bearings was established based on the Kirchhoff theory,and mechanical analysis of the sliding beam was carried out in combination with the large deformation equation of the beam and the principle of minimum potential energy.The deformation calculation of the top foil,the sliding beam and the frame structure around the sliding beam was realized.The Reynolds equation was introduced to develop a fluid-structure interaction calculation model for analyzing the lubrication performance.Through MATLAB programming,the air film pressure,air film thickness,bearing friction torque and end leakage flow rate were calculated,and the reliability of the calculation model was verified by experiments.Combined with specific cases,the influences of structural parameters including standard air film thickness,sliding beam length,sliding beam width,sliding beam slope,bottom foil thickness and top foil thickness on the lubrication performance of the bearing were studied.Results showed that with the increase of initial clearance between the bearing and the rotor,the dynamic pressure region of the air film decreased,the maximum pressure of the air film rose,the friction torque decreased,and the end leakage flow rate increased.Discontinuity in the support of the top foil by the sliding beam led to discontinuity in the distribution of air film pressure and air film thickness.Adjusting the sliding beam size and the bottom foil thickness changed the support stiffness of the sliding beam to the top foil.When the support stiffness increased,the thickness of the air film decreased and the maximum pressure of the air film increased.
作者
韩怡萱
吴洋
顾晨昀
冯伟军
安琦
HAN Yixuan;WU Yang;GU Chenyun;FENG Weijun;AN Qi(School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China;Suzhou Changheng Precision Metal Die Casting Co.Ltd,Suzhou 215534,China)
出处
《浙江大学学报(工学版)》
北大核心
2026年第1期138-147,共10页
Journal of Zhejiang University(Engineering Science)
关键词
滑梁式空气箔片轴承
力学建模
流固耦合
润滑性能
数值计算
sliding beam air foil bearing
mechanical modeling
fluid-structure interaction
lubrication performance
numerical calculation
