考虑轴颈涡动的滑动轴承动力特性数值研究
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摘要
基于非定常动网格技术建立了考虑轴颈涡动频率与涡动轨迹的滑动轴承动力特性求解模型。在验证求解模型准确性的基础上,研究了轴颈正弦直线涡动轨迹、圆涡动轨迹、椭圆涡动轨迹下,涡动频率和偏心率对滑动轴承动力特性的影响。研究结果表明:轴颈的周期性涡动导致轴承油膜最小间隙和油膜压力周期性变化,油膜最小间隙越小,油膜压力越大;随着轴颈正弦轨迹涡动,由此形成的油膜力也呈正弦规律变化,且变化频率与轴颈涡动频率相同,但油膜力的相位滞后于轴颈涡动位移的相位;轴颈涡动频率及涡动轨迹对滑动轴承动力特性影响较大,需要考虑轴颈涡动对滑动轴承动力特性的影响。随着偏心率的增加,动力特性系数绝对值均随之增大。
The unsteady solution combined with mesh deformation technique was used to establish a solution model of the dynamic characteristics of journal bearing in consideration of whirling frequency and orbit of the journal.On the basis of verifying the accuracy of the solution model,the influences of whirling frequency and eccentricity on the dynamic characteristics of journal bearing were studied when journal whirled with sinusoidal orbit,circular orbit and elliptical orbit.Study results indicate that the radical clearance and oil film pressure change along with the whirling motion of the journal.The smaller radical clearance means the greater oil film pressure.With the sinusoidal whirling orbit of the journal,oil film forces change,and the frequency of the oil film force is the same as whirling displacement of the journal.However,the phase of oil film force lags behind the whirling displacement.The whirling frequency and orbit of the journal greatly influence the dynamic characteristics ofjournal bearing,so the whirling motion of the journal should be considered.With the increase of eccentricity,the absolute value of the dynamic coefficients increase.
The unsteady solution combined with mesh deformation technique was used to establish a solution model of the dynamic characteristics of journal bearing in consideration of whirling frequency and orbit of the journal.On the basis of verifying the accuracy of the solution model,the influences of whirling frequency and eccentricity on the dynamic characteristics of journal bearing were studied when journal whirled with sinusoidal orbit,circular orbit and elliptical orbit.Study results indicate that the radical clearance and oil film pressure change along with the whirling motion of the journal.The smaller radical clearance means the greater oil film pressure.With the sinusoidal whirling orbit of the journal,oil film forces change,and the frequency of the oil film force is the same as whirling displacement of the journal.However,the phase of oil film force lags behind the whirling displacement.The whirling frequency and orbit of the journal greatly influence the dynamic characteristics ofjournal bearing,so the whirling motion of the journal should be considered.With the increase of eccentricity,the absolute value of the dynamic coefficients increase.
引文
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[21]NIELSEN K K,J?NCK K M,UNDERBAKKE H.Holepattern and honeycomb seal rotordynamic forces:validation of CFD-based prediction techniques[J].Journal of Engineering for Gas Turbines and Power,2012,134(12):1017-1029.
[22]CHILDS D W.Turbomachinery rotordynamics:phenomena,modeling and analysis[M].New York:John Wiley and Sons Incorporation,1993.
[2]杨金福,杨晟博,陈策,等.滑动轴承-转子系统的稳定性研究[J].航空动力学报,2008,23(8):1420-1426.YANG Jinfu,YANG Shengbo,CHEN Che,et al.Research on sliding bearings and rotor system stability[J].Journal of Aerospace Power,2008,23(8):1420-1426.(in Chinese)
[3]李强,许伟伟,王振波,等.滑动轴承动力特性的数值计算方法[J].中国石油大学学报,2014,38(5):165-171.LI Qiang,XU Weiwei,WANG Zhenbo,et al.Numerical calculation of dynamic characteristics of journal bearing[J].Journal of China University of Petroleum,2014,38(5):165-171.(in Chinese)
[4]李元生,敖良波,李磊,等.滑动轴承动力特性系数动态分析方法[J].机械工程学报,2010,46(21):48-53.LI Yuansheng,AO Liangbo,LI Lei,et al.Dynamic analysis method of dynamic character coefficient of hydrodynamic journal bearing[J].Journal of Mechanical Engineering,2010,46(21):48-53.(in Chinese)
[5]LUND J W.The stability of an elastic rotor in journal bearings with flexible damped supports[J].Journal of Applied Mechanics,1965,32(4):911-920.
[6]毛文贵,韩旭,刘桂萍.基于流固耦合的滑动轴承非线性油膜动特性研究[J].中国机械工程,2014,25(3):383-403.MAO Wengui,HAN Xu,LIU Guiping.Research on dynamic characteristics of sliding bearing nonlinear oil-film based on fluid-structure interaction[J].China Mechanical Engineering,2014,25(3):383-403.(in Chinese)
[7]王立刚,曹登庆,王晋麟,等.椭圆轴承-转子系统的稳定性与分岔[J].航空动力学报,2008,23(2):263-269.WANG Ligang,CAO Dengqing,WANG Jinlin,et al.Stability and bifurcation of elliptic bearing-rotor systems[J].Journal of Aerospace Power,2008,23(2):263-269.(in Chinese)
[8]王永亮,刘占生,钱大帅,等.有限长椭圆瓦轴承油膜力近似解析模型[J].航空动力学报,2012,27(2):265-274.WANG Yongliang,LIU Zhansheng,QIAN Dashuai,et al.Approximate analytical model of oil-film force for finite length elliptical journal bearing[J].Journal of Aerospace Power,2012,27(2):265-274.(in Chinese)
[9]SHI D Y,SHI X J,SHI X B.Numerical computation of dynamic character coefficient of journal bearing[J].Key Engineering Materials,2011,486(7):45-48.
[10]孙丹,杨建刚,郭瑞.基于局部微分求积-拉格朗日法的滑动轴承动力特性求解模型[J].中国电机工程学报,2011,31(14):90-95.SUN Dan,YANG Jiangang,GUO Rui.Journal bearing dynamic characteristics calculation model based on the local differential quadrature-Lagrange method based on Lagrange interpolation method[J].Proceedings of the CSEE,2011,31(14):90-95.(in Chinese)
[11]张楚,杨建刚,郭瑞,等.基于两相流理论的滑动轴承流场计算分析[J].中国电机工程学报,2010,30(29):80-84.ZHANG Chu,YANG Jiangang,Guo Rui,et al.Simulation of journal bearing flow field using computational fluid dynamics two phase flow theory[J].Proceedings of the CSEE,2010,30(29):80-84.(in Chinese)
[12]孙丹,张楚,郭瑞,等.基于两相流理论滑动轴承动力特性求解[J].航空动力学报,2012,27(12):2821-2827.SUN Dan,ZHANG Chu,GUO Rui,et al.Solution of dynamic of journal bearing based on two phase flow theory[J].Journal of Aerospace Power,2012,27(12):2821-2827.(in Chinese)
[13]GUO Zenglin,HIRANO T,KIRK R,et al.Application of CFD analysis for rotating machinery:PartⅠhydrodynamic,hydrostatic bearings and squeeze film damper[J].Journal of Engineering for Gas Turbines and Power,2005,127(2):445-451.
[14]熊万里,侯志泉,吕浪,等.基于动网格模型的液体动静压轴承刚度阻尼计算方法[J].机械工程学报,2012,48(23):118-126.XIONG Wanli,HOU Zhiquan,LLang,et al.Method for calculating stiffness and damping coefficients of cybrid bearings based on dynamic mesh model[J].Journal of Mechanical Engineering,2012,48(23):118-126.(in Chinese)
[15]于桂昌,刘淑莲,郑水英.扰动情况下双油槽圆形轴瓦滑动轴承性能分析[J].振动与冲击,2012,31(5):46-49.YU Guichang,LIU Shulian,ZHENG Shuiying.Double oil grooved round sliding bearing performance analysis with disturbance[J].Journal of Vibration and Shock,2012,31(5):46-49.(in Chinese)
[16]SAN ANDRES L,CHIRATHADAM T A.Metal mesh foil bearing:effect of motion amplitude,rotor speed,static load,and excitation frequency on force coefficients[J].Journal of Engineering for Gas Turbines and Power,2011,133(12):1201-1208.
[17]BOMPOS D A,NIKOLAKOPOULOS P G.Experimental and analytical investigations of dynamic characteristics of magnetorheological and nano magnetorheological fluid film journal bearing[R].ASME Paper GT2014-25219,2014.
[18]袁惠群.转子动力学基础[M].北京:冶金工业出版社,2013.
[19]钟一谔.转子动力学[M].北京:清华大学出版社,1987.
[20]YAN Xin,LI Jun,FENG Zhenping.Investigations on the rotordynamic characteristics of a hole-pattern seal using transient CFD and periodic circular orbit model[J].Journal of Vibration and Acoustics,2011,133(4):783-789.
[21]NIELSEN K K,J?NCK K M,UNDERBAKKE H.Holepattern and honeycomb seal rotordynamic forces:validation of CFD-based prediction techniques[J].Journal of Engineering for Gas Turbines and Power,2012,134(12):1017-1029.
[22]CHILDS D W.Turbomachinery rotordynamics:phenomena,modeling and analysis[M].New York:John Wiley and Sons Incorporation,1993.