Damping Coefficient Identification and Analysis for Squeeze Film Dampers

Abstract

Abstract: In order to identify damping coefficients of SFD, the experimental tests were researched. Firstly, the bidirection excitation rig was excited by signal generator and power amplifier. Then the excitation and response data were obtained by impedance head. Lastly, damping coefficients of SFD were obtained by the least squares fit based on the principles of mechanical impedance. The influence of SFD parameters on damping coefficients was researched by changing oil width and clearance. The experimental tests show that the oil damping presents a trend of nonlinear increase with the increase of oil width. Oil damping can be increased by increasing the oil width, then the damping performance of the damper is improved. With the increase of the oil film gap, oil damping presents a trend of nonlinear decrease, and damping performance is declined.

Key words: squeeze film damper(SFD), oil damping, mechanical impedance, bidirection excitation

摘要： 为了进行挤压油膜阻尼器油膜阻尼系数识别的实验研究，首先,利用信号发生器和功率放大器对双向激励实验器进行激振；然后，借助阻抗头获得激励和响应数据；最后，基于机械阻抗原理，通过最小二乘法拟合，得到挤压油膜阻尼器的油膜阻尼系数。通过改变油膜宽度和油膜间隙，研究不同挤压油膜阻尼器参数对油膜阻尼的影响。研究结果表明，随着油膜宽度的线性增大，油膜阻尼呈现非线性增大的趋势。可以通过增大油膜宽度和油膜阻尼，来提高阻尼器的减振性能。随着油膜间隙的线性增大，油膜阻尼呈现非线性减小的趋势，减振性能下降。

关键词: 挤压油膜阻尼器, 油膜阻尼, 机械阻抗法, 双向激励

CLC Number:

V231.96

Zhou Hailun, Feng Guoquan, Zhang Ming, Ai Yanting. Damping Coefficient Identification and Analysis for Squeeze Film Dampers[J]. China Mechanical Engineering.

周海仑, 冯国全, 张明, 艾延廷. 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.

References

[1]Luis S A. 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.

[2]李舜酩, 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. Dynamic Characteristics Analysis on Squeeze Film Damper[J].Journal of Vibration and Shock, 2009, 28(5): 44-48.

[3]黄太平, 田淑芳. 弹性阻尼支承动态特性分析与试验[J]. 南京航空航天大学学报, 1983, 15(3): 22-36.

Huang Taiping, Tian Shufang. Techniques for the Dynamic Test of the Flexible Damped Supports[J]. Journal of Nanjing University of Aeronautics & Astronautics, 1983, 15(3): 22-36.

[4]王震林. 涡轴发动机挤压油膜阻尼器阻尼特性数值与实验研究[D]. 哈尔滨: 哈尔滨工业大学, 2013.

[5]徐宁, 王旭, 张敏, 等.船用燃气轮机挤压油膜阻尼器阻尼特性试验研究[J]. 热能动力工程, 2012, 27(1): 13-17.

Xu Ning, Wang Xu, Zhang Min, et al. Experimen- tal Investigation into Dynamic Behaviors of Squeeze Film Damper of Rotor Support System in Marine Gas Turbine[J]. Journal of Engineering for Thermal Energy and Power, 2012, 27(1): 13-17.

[6]徐宁. 舰船燃气轮机转子支撑系统动力学特性研究[D]. 北京: 中国舰船研究院, 2012.

[7]马艳红, 洪杰, 赵福安. 自适应挤压油膜阻尼器减振机理研究[J]. 北京航空航天大学学报, 2003, 29(2): 173-177.

Ma Yanhong, Hong Jie, Zhao Fuan.Vibration Attenuation Mechanism Investigation of an Adaptive Squeeze Film Damper[J].Journal of Beijing University of Aeronautics and Astronautics, 2003, 29(2): 173-177.

[8]周海仑, 冯国全, 罗贵火, 等. 浮环式挤压油膜阻尼器的减振机理分析[J]. 航空动力学报, 2015, 30(04): 966-971.

Zhou Hailun, Feng Guoquan, Luo Guihuo, et al. Research on Damping Mechanism of Floating Ring Squeeze Film Damper[J].Journal of Aerospace Power, 2003, 29(2): 173-177.

[9]Siew C, Hill M, Holmes R. Evaluation of Various Fluid-film Models for Use in the Analysis of Squeeze Film Dampers with a Central Groove[J]. Tribology International, 2002, 35(8): 533-547.

[10]Luis S A, Jeung S-H. Experimental Performance of an Open Ends, Centrally Grooved, Squeeze Film Damper Operating with Large Amplitude Orbital Motions[J]. Journal of Engineering for Gas Turbines and Power, 2015, 137(3): 1-9.

[11]Luis S A, 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): 112503-112503-9.

[12]Luis S A. Damping and Inertia Coefficients for Two Open Ends Squeeze Film Dampers with a Central Groove: Measurements and Predictions[J]. Journal of Engineering for Gas Turbines and Power, 2012, 134(10): 769-778.

[13]Jeung S-H, Luis S A, 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): 022501-022501-11.

[14]Luis S A, Jeung S H. Orbit-model Force Coefficients for Fluid Film Bearings: A Step beyond Linearization[J]. Journal of Engineering for Gas Turbines & Power, 2016, 138(2) : 022502-022502-11.

[15]Luis S A, Delgado A. Squeeze Film Damper with a Mechanical End Seal: Experimental Force Coefficients Derived from Circular Centered Orbits[J]. Journal of Engineering for Gas Turbines & Power, 2008, 130(4):635-644.

[16]Luis S A, Delgado A. Identification of Force Coefficients in a Squeeze Film Damper with a Mechanical End Seal—Part I: Unidirectional Load Tests[J]. Journal of Engineering for Gas Turbines and Power, 2007, 129(3): 858-864.

[17]Luis S A, Delgado A. Identification of Force Coefficients in a Squeeze Film Damper with a Mechanical End Seal-centered Circular Orbit Tests[J]. Journal of Tribology, 2007, 129(3): 660-668.

[18]周海仑. 含浮环式挤压油膜阻尼器的转子系统动力特性分析[D].南京:南京航空航天大学，2013.

[19]Zhou H L, Luo G H, Chen G, et al. Two Dyn-amic Models of Dual Clearance Squeeze Film Damper and Their Verification[J]. Tribology International, 2013, 66(7): 187-193.

[20]强健. 带浮环的挤压油膜阻尼器特性研究[D].南京:南京航空航天大学, 2011.

[21]闻邦椿, 顾家柳, 夏松波, 等. 高等转子动力学[M].北京:机械工业出版社, 2000.

[22]顾家柳, 丁奎元, 刘启洲, 等. 转子动力学[M].北京:国防工业出版社, 1985.