基於反渦旋流體注入油膜軸承其影響因子及消除流體引發不穩定之研究

簡易檢索 / 詳目顯示

回結果列表

研究生：	黎大都 LE DUC DO
論文名稱：	基於反渦旋流體注入油膜軸承其影響因子及消除流體引發不穩定之研究 Investigation on Influential Factors and the Elimination of Fluid-Induced Instability Based on Anti-swirl Injection in Fluid-Film Bearings
指導教授：	潘敏俊 PAN MIN CHUN
口試委員:
學位類別：	博士 Doctor
系所名稱：	工學院 - 機械工程學系 Department of Mechanical Engineering
論文出版年：	2016
畢業學年度：	104
語文別：	英文
論文頁數：	104
中文關鍵詞：	流體引發不穩定, 、油旋, 、可接受範圍, 、田口法, 、線性二次調節器, 、油循環阻斷,
外文關鍵詞：	Fluid-induced instability,, Whirl,, Taguchi method,, Oil circulation blocking,, Linear quadratic regulator,, Acceptance region.
相關次數：	點閱：13 下載：0
分享至:	分享至facebook 分享至twitter

查詢本校圖書館目錄查詢臺灣博碩士論文知識加值系統勘誤回報

存於油膜軸承系統中，流體所引發之不穩定現象已經被研究多年。此研究提議使用可實施最少次實驗之田口法，來評估流體引發不穩定之相關因子的影響程度。在實驗中，配重塊不平衡、油循環堵塞、油壓及油溫被視為控制因子，且區分為兩種級別，並進而決定直交表。當機械裝置的操作狀況改變，透過機械振動信號的分析可以評估不穩定門檻。結果顯示，配重塊不平衡和油溫是流體引發不穩定的重要因子，且配重塊不平衡有較大之影響。因因子間存在著交互作用，當配重塊不平衡和其他任一因子共同使用，反而會提早引發不穩定。所以對於消除不穩定而言，配重塊不平衡只能單獨作用。因此，提高油溫是最有效增加不穩定門檻之方法。因軸頸速度相關聯之流體周圍平均速度是引起不穩定的關鍵因素，所以透過使用最佳化控制之線性二次調節器注入反漩渦，以減輕且甚至消除在旋轉機械中之油漩，進而增加不穩定的門檻，也是本研究之目標。為了決定啟動控制程序，本研究建立可接受範圍，並利用三個案例來驗證此控制方案之有效性。研究結果顯示，結合可接受範圍之控制方案有能避免旋轉機械中流體引發不穩定之能力。此外，此發展技術可以被適用於其它流體引發不穩定問題，諸如油顫和摩擦等等。

The phenomenon of fluid-induced instability existing in fluid-film bearing systems has been addressed for years. The revolution speed at which the instability onset occurs is called the threshold of instability. The important parameters of the instability threshold are fluid circumferential average velocity ratio and fluid radial stiffness. The study proposes to construct experimentation based on Taguchi method with the least runs of experiment to evaluate the influence of factors on the occurrence of fluid-induced instability. Disk unbalance, oil circulation blocking, oil pressure, and oil temperature classified as control factors with two levels are selected to conduct the experiments. Then, the appropriate orthogonal array L8 is determined. When the operation conditions of machinery change, the threshold of instability can be evaluated through the analysis of machinery vibration signals. Observed from the results, disk unbalance and oil temperature are the significant factors for fluid-induced instability. However, due to interaction between each factors, the instability occurred earlier when disk unbalance and any other instability factors are performed together. Thus, disk unbalance should be dealt with solely for the elimination of instability. As a result, the threshold of instability can be most effectively increased by raising oil temperature. Since the fluid circumferential average velocity associated with journal speed generally is a key factor to cause the instability, thus the research also aims to soothe and even eliminate the occurrence of whirl in rotary machinery by increasing the threshold of instability through the anti-swirl injection using the linear quadratic regulator based optimal control. An acceptance region was established in order to decide starting up the control process. Three case studies were carried out to illustrate the effectiveness of the control scheme. The research results demonstrate that the control scheme incorporating with the acceptance region enables to avoid the occurrence of fluid-induced instability in rotary machinery. Moreover, the developed techniques can also be applied in other fluid-induced instability problems such as whip and rub, etc.

摘 要    I
Abstract    II
Acknowledgement    IV
Contents    V
List of Figures    VIII
List of Tables    XI
Nomenclatures    XII
Chapter 1
Introduction    1
1.1    Research Background and Motivation    1
1.2    Literature Review    3
1.3    Dissertation Outline    8
Chapter 2
Mathematical Modeling of Physical Systems    10
2.1    Preface    10
2.1.1    Types of Fluid-Film Bearings    10
2.1.2    Fluid Circulation    12
2.2    Rotor System Modeling    13
2.2.1 Fluid Force Model    14
2.2.2 Rotor Model    16
2.3    Self-Excited Vibration    19
2.4    Taguchi Method    21
2.4.1    Orthogonal Array    21
2.4.2    Taguchi Quality Loss Function    22
2.4.3    Signal to Noise Ratio (S/N)    23
2.4.4    Analysis of Variance (ANOVA)    24
2.4.5    Confirmation Experiment    26
2.5    Linear Quadratic Regulator    27
Chapter 3
Experimental Setup and Procedure    32
3.1    Experimental Setup and Procedure for Evaluating Factor Effects    32
3.1.1  Rotor Rig 1    32
3.1.2 Control Factor Design Module    34
3.1.3 Taguchi Experiment on the Occurrence of Fluid Whirl    35
3.2    Experimental Setup and Procedure for Eliminating Whirl Occurrence Based Anti-swirl Injection Technique    38
3.2.1  Rotor Rig 2    38
3.2.2  Digital Signal Processing (DSP) Board and Graphical User Interface (GUI)    40
3.2.3  Control Procedure of Fluid-whirl Elimination    41
Chapter 4
Experimental Results and Discussions    43
Experiment 1: Evaluating Factor Effects    43
4.1  Vibration Observation    43
4.2  Analysis of the Signal to Noise Ratio    45
4.3  Analysis of Variance (ANOVA)    48
4.4  Experiment Validation    49
4.5  Concluding Remarks    50
Experiment 2: Eliminating Fluid Whirl Occurrence Based Anti-swirl Injection Technique    52
4.6  Vibration Observation without Control    52
4.6.1 Result Interpretation    52
4.6.1.1 Timebase plot    52
4.6.1.2 Orbit plot    54
4.6.2  Transition from Stability to Instability    56
4.6.3  Acceptance Region    57
4.7  Elimination of Fluid-Induced Instability under Control Strategy    59
4.8  Concluding Remarks    70
Chapter 5
Conclusions and Future Works    71
5.1 Conclusions    71
5.2  Future Works    72
References    74
Appendixes    78
Publication work    89

                                

[1] D. E. Bently and C. T. Hatch, Fundamentals of Rotating Machinery Diagnostics: Bently Pressurized Bearing Company, 2002.
[2] A. Muszynska, Rotordynamics: CRC Taylor & Francis Group, 2005.
[3] R. Gasch, R. Nordmann, and H. Pfützner, Rotordynamik: Springer, 2002.
[4] J. Vance, Rotordynamics of Turbomachinery, 1st edition, 1988.
[5] D. Childs, Turbomachinery Rotordynamics: Wiley-Intersciences, 1993.
[6] G. Genta, Dynamics of Rotating Systems: Springer, 2005.
[7] C. Hearn, W. Maddox, Y. Kim, V. Gupta, D. Masser, P. Koenemant, C. Chu, I. Busch-Vishniac, D. Neikirk, W. Weldon, and K. Wood, "Smart Mechanical Bearings Using MEMS Technology," in Tribology Symposium 1995 , ASME, pp. 1-10, 1995.
[8] H. Rylander, M. Carlson, and C. Lin, "Actively Controlled Bearing Surface Profiles Theory and Experiments," presented at the Tribology Symposium 1995, 1995.
[9] R. Nicoletti and I. F. Santos, "Control System Design for Flexible Rotors Supported by Actively Lubricated Bearings," Journal of Vibration and Control, vol. 14, pp. 347–374, 2008.
[10] D. C. Deckler, R. J. Veillette, M. J. Braun, and F. K. Choy, "Simulation and Control of an Active Tilting-Pad Journal Bearing," Tribology Transactions, vol. 47, pp. 440-458, 2004.
[11] Z. Cai, M. S. de Queiroz, and M. M. Khonsari, "On the Active Stabilization of Tilting-pad Journal Bearings," Journal of Sound and Vibration, vol. 273, pp. 421-428, 2004.
[12] D. E. Bently and C. T. Hatch, "Shaft Levitation Made Simple," in Turbomachinery International, pp. 30–32, 2006.
[13] K. Cheng and W. B. Rowe, "A Selection Strategy for the Design of Externally Pressurized Journal Bearings," Tribology International, vol. 28, pp. 465-474, 1995.
[14] A. Muszynska, W. D. Franklin, and D. E. Bently, "Rotor Active “Anti-Swirl” Control," Journal of Vibration, Acoustics Stress and Reliability in Design, vol. 110, pp. 143-150, 1988.
[15] A. Muszynska and D. E. Bently, "Anti-Swirl Arrangements Prevent Rotor/Seal Instability," Journal of Vibration, Acoustics, Stress and Reliability in Design, vol. 111, pp. 156-162, 1989.
[16] N. Amati, S. Carabelli, G. Genta, P. Macchi, M. Silvagni, and A. Tonoli, "More Electric Aero Engines: Tradeoff Between Different Electromagnetic Dampers and Supports," in Proceedings of the 10th ISMB Conference, Martigny, Switzerland, pp. 21–23, 2006.
[17] C.-C. Fan and M.-C. Pan, "Experimental Study on the Whip Elimination of Rotor-bearing Systems with Electromagnetic Exciters," Mechanism and Machine Theory, vol. 46, pp. 290-304, 2011.
[18] L. J. Read and R. D. Flack, "Temperature, Pressure and Film Thickness Measurements for an Offset Half Bearing," Wear, vol. 117, pp. 197-210, 1987.
[19] S. B. Glavatskih, Ö. Uusitalo, and D. J. Spohn, "Simultaneous Monitoring of Oil Film Thickness and Temperature in Fluid Film Bearings," Tribology International, vol. 34, pp. 853-857, 2001.
[20] H. F. de Castro, K. L. Cavalca, and R. Nordmann, "Whirl and Whip Instabilities in Rotor-bearing System Considering a Nonlinear Force Model," Journal of Sound and Vibration, vol. 317, pp. 273-293, 2008.
[21] J. Durany, J. Pereira, and F. Varas, "Dynamical Stability of Journal-bearing Devices through Numerical Simulation of Thermohydrodynamic Models," Tribology International, vol. 43, pp. 1703-1718, 2010.
[22] R. Gordon Kirk and A. A. Alsaeed, "Induced Unbalance as a Method for Improving the Dynamic Stability of High-Speed Turbochargers," International Journal of Rotating Machinery, vol. 2011, p. 9, 2011.
[23] M. d. Queiroz, "An Active Hydrodynamic Bearing for Controlling Self-excited vibrations: Theory and Simulation," Journal of Vibration and Control, vol. 19, pp. 2211-2222, October 1, 2013.
[24] J. Tůma, J. Šimek, J. Škuta, and J. Los, "Active Vibrations Control of Journal Bearings with the Use of Piezoactuators," Mechanical Systems and Signal Processing, vol. 36, pp. 618-629, 2013.
[25] K. Robbersmyr, H. Olsen, H. Karimi, and K. Tønder, "Oil Whip-induced Wear in Journal Bearings," The International Journal of Advanced Manufacturing Technology, vol. 73, pp. 973-980, 2014.
[26] C. Li, S. Zhou, S. Jiang, H. Yu, and B. Wen, "Investigation on the Stability of Periodic Motions of a Flexible Rotor-bearing System with Two Unbalanced Disks," Journal of Mechanical Science and Technology, vol. 28, pp. 2561-2579, 2014.
[27] C.-C. Fan and M.-C. Pan, "Active Elimination of Oil and Dry Whips in a Rotating Machine with an Electromagnetic Actuator," International Journal of Mechanical Sciences, vol. 53, pp. 126-134, 2011.
[28] W. H. Yang and Y. S. Tarng, "Design Optimization of Cutting Parameters for Turning Operations Based on the Taguchi method," Journal of Materials Processing Technology, vol. 84, pp. 122-129, 1998.
[29] J. A. Ghani, I. A. Choudhury, and H. H. Hassan, "Application of Taguchi method in the Optimization of End Milling Parameters," Journal of Materials Processing Technology, vol. 145, pp. 84-92, 2004.
[30] C. Manoharan and V. P. Arunachalam, "Dynamic Analysis of Hydrodynamic Bearing Performance in IC Engines by Using Taguchi Technique and Response Surface Methodology (RSM)," The International Journal of Advanced Manufacturing Technology, vol. 36, pp. 1061-1071, 2008.
[31] B. Gopalsamy, B. Mondal, and S. Ghosh, "Optimisation of Machining Parameters for Hard Machining: Grey Relational Theory Approach and ANOVA," The International Journal of Advanced Manufacturing Technology, vol. 45, pp. 1068-1086, 2009.
[32] J. B. Burl, Linear Optimal Control: H2 and H[infinity] Methods: Addison Wesley Longman, 1999.
[33] A. Tewari, Modern control design with Matlab and simulink: John Wiley, 2002.
[34] W. B. ROWE, Hydrostatic and Hybrid Bearing Design: Butterworth-Heinemann, 1983.
[35] G. P.J. Ross, Taguchi Techniques for Quality Engineering: McGraw-Hill, 1988.
[36] R. K. Roy, A primer on the Taguchi Method. New York: Van Norstrand Reinhold, 1990.
[37] F. L. Lewis, D. L. Vrabie, and V. L. Syrmos, Optimal Control: John Wiley & Sons, Inc., 1995.
[38] R. Larson and L. Zadeh, "Foreword [Intro. to the Bellman Special Issue]," Automatic Control, IEEE Transactions, vol. 26, pp. 986-987, 1981.
[39] R. Bellman, Adaptive control process: A guided tour: Princeton University Press, 1961.

簡易檢索 / 詳目顯示

相關論文