为研究供油条件对挤压油膜阻尼器减振特性的影响，利用计算流体力学软件进行阻尼器的建模和数值仿真模拟。为了保证数值模拟的正确性和合理性，借助于双向激励试验器，基于机械阻抗法获得油膜阻尼，与数值仿真结果进行对比验证。通过数值仿真，研究供油孔数量、供油孔横截面积、供油槽尺寸以及供油流量等对阻尼器等效阻尼和周向位置阻尼的影响。结果表明：由于受到供油孔处的供油压力影响，单孔供油阻尼器提供的阻尼随周向位置呈现近似简谐函数曲线的变化规律，多个对称分布的供油孔可以有效地抑制这种影响，含有三个或者四个对称供油孔的阻尼器，不同周向位置的阻尼在一个进动周期内几乎保持不变。对于供油槽较浅的情况，阻尼器的等效阻尼随着偏心率的增加呈现非线性增加的趋势；随着供油槽深度的增加，非线性增加的趋势逐渐减弱；而供油槽较深时，等效阻尼随着偏心率的增加先减小后增加。另外，阻尼器供油槽宽度和供油流量对阻尼器的阻尼特性也有着明显的影响。研究结果将为挤压油膜阻尼器的设计提供依据。
周海仑
,
张明
,
成晓鸣
,
唐振寰
,
曹鹏
. 供油条件对挤压油膜阻尼器等效阻及周向位置阻尼的影响[J]. 机械工程学报, 2018
, 54(6)
: 215
-223
.
DOI: 10.3901/JME.2018.06.215
In order to study the effect of oil supply conditions on the damping characteristics of squeeze film damper, the damper modeling and numerical simulation are carried out by using computational fluid dynamics software. To ensure the correctness and rationality of the numerical simulation, the damping of the oil film is obtained by the bi-direction excitation rig based on the principle of mechanical impedance and compared with the numerical simulation results. The influence of the number of oil supply holes, the cross-sectional area of the oil supply hole, the size of the oil supply groove and the oil supply flow on the equivalent damping and circumferential damping of the damper are studied. The results show that, due to the influence of oil film pressure at the oil supply hole, the damping of the single hole oil supply damper presents the variation of the approximate harmonic function curve with the circumferential position, and the multiple symmetrically distributed feed holes can effectively suppress this effect. With three or four symmetrical feed holes in the damper, the damping of the different circumferential positions in one cycle is almost constant. For the shallow oil supply groove, the equivalent damping of the damper increases nonlinearly with the increasing of the eccentricity. When the oil supply groove is deep, the equivalent damping tends to decrease firstly and then increase with the increase of eccentricity. In addition, the damping characteristics of the damper are influenced by the width of the oil supply groove and the flow rate of the oil supply. The results will provide the basis for the design of squeeze film damper.
[1] ANDRES L S,DEN S,JEUNG S-H. Transient response of a short-length (L/D=0.2) open-ends elastically supported squeeze film damper:Centered and largely off-centered whirl motions[J]. Journal of Engineering for Gas Turbines and Power,2016,138(12):122503-1-11.
[2] ANDRES L S,JEUNG S-H. Response of a squeeze film damper-elastic structure system to multiple and consecutive impact loads[J]. Journal of Engineering for Gas Turbines and Power,2016,138(12):122504-1-12.
[3] 付才高. 航空发动机设计手册:第19册[M]. 北京:航空工业出版社,2000. FU Caigao. Aero engine design manual:Book 19[M]. Beijing:Aviation Industry Press,2000.
[4] 李瞬酩,陈钊,李彦. 一种挤压油膜阻尼器的动力特性分析[J]. 振动与冲击,2009,28(5):44-48. LI Shunming,CHEN Zhao,LI Yan. Analysis of dynamic characteristics of a squeeze film damper[J]. Journal of Vibration and Shock,2009,28(5):44-48.
[5] 刘展翅,廖明夫,丛佩红,等. 静偏心对挤压油膜阻尼器减振特性影响实验研究[J]. 推进技术,2016,37(8):1560-1568. LIU Zhanchi,LIAO Mingfu,CONG Peihong,et al. Experimental investigation for effects of static eccentricity on vibration attenuating characteristics of squeeze film damper[J]. Journal of Propulsion Technology,2016,37(8):1560-1568.
[6] 刘展翅,廖明夫,丛佩红,等. 航空发动机转子挤压油膜阻尼器设计方法[J]. 航空动力学报,2015,30(11):2762-2770. LIU Zhanchi,LIAO Mingfu,CONG Peihong,et al. Design method of squeeze film damper for aero-engine rotors[J]. Journal of Aerospace Power,2015,30(11):2762-2770.
[7] 程礼,李帅莹,钱征文. 带挤压油膜阻尼器的盘式拉杆转子双稳态振动特性[J]. 航空动力学报,2013,28(9):2044-2049. CHENG Li,LI Shuaiying,QIAN Zhengwen. Bistable vibration characterritics of disk-rod-fastening rotor with squeeze film damperi[J]. Journal of Aerospace Power,2013,28(9):2044-2049.
[8] ZHOU H L,LUO G H,CHEN G,et al. Two dynamic models of dual clearance squeeze film damper and their verification[J]. Tribology International,2013,66(7):187-193.
[9] ZHOU H L,FENG G Q,LUO G H,et al. The dynamic characteristics of a rotor supported on ball bearings with different floating ring squeeze film dampers[J]. Mechanism and Machine Theory,2014,80(4):200-213.
[10] 周海仑,冯国全,张明. 挤压油膜阻尼器油膜阻尼系数识别及分析[J]. 中国机械工程,2016,27(15):2015-2020. ZHOU Hailun,FENG Guoquan,ZHANG Ming. Dampering coefficent identification and analysis for squeeze film dampers[J]. China Mechanical Engineering,2016,27(15):2015-2020.
[11] JAGER S,VOGEL S. Validation of a squeeze film damper test rig by using multibody cosimulation[J]. Multibody System Dynamics,2015,34(3):243-257.
[12] JEUNG S H,ANDRES L S,BRADLEY G. Forced coefficients for a short length,open ends squeeze film damper with end grooves:experiments and predictions[J]. Journal of Engineering for Gas Turbines and Power,2016,138(2):022501-1-11.
[13] ANDRES L S. Force coefficients for a large clearance open ends squeeze film damper with a central feed groove:experiments and predictions[J]. Tribology International,2014,71(1):17-25.
[14] ANDRES L S,SESHAGIRI S. Damping and inertia coefficients for two end sealed squeeze film dampers with a central groove:measurements and predictions[J]. Journal of Engineering for Gas Turbines and Power,2013,135(11):112503-1-9.
[15] DOUSTI S,GERAMI A,DOUSTI M. A numerical CFD analysis on supply groove effects in high pressure,open end squeeze film dampers[J]. International Journal of Engineering Innovation and Research,2016,5(1):80-89.
[16] CAO J, DIMOND T, ALLAIRE P. Numerical analysis of flexible rotor with nonlinear bearings and squeeze film dampers[C]//ASME 2014. International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014.
[17] HE F, ALLAIRE P E, DOUSTI S, et al. Forced response of a flexible rotor with squeeze film damper under parametric change[C]//ASME Turbo Expo 2013:Turbine Technical Conference and Exposition,2013:V07AT29A026-V07AT29A026.
[18] MORARU L,KEITH T G. Dynamic modeling of a dual clearance squeeze film damper[J]. Tribology Transactions,2006,49(4):611-620.
[19] 姜洪源,张蕊华,赵克定,等. 金属橡胶挤压油膜阻尼器阻尼性能分析[J]. 推进技术,2005,26(2):175-177. JIANG Hongyuan,ZHANG Ruihua,ZHAO Keding,et al. Analysis of dampering characterristics of squeeze film damper withmetal rubber[J]. Journal of Propulsion Technology,2005,26(2):175-177.
[20] DIAZ S,ANDRES L S. A model for squeeze film dampers operating with air entrainment and validation with experiments[J]. Journal of Tribology,2000,123(1):125-133.
