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

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姓名

黎大都(LE DUC DO) 查詢紙本館藏

畢業系所

機械工程學系

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)

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摘要(中)

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。

摘要(英)

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.

關鍵字(中)

★ 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,

關鍵字(英)

★ Fluid-induced instability,
★ Whirl,
★ Taguchi method,
★ Oil circulation blocking,
★ Linear quadratic regulator,
★ Acceptance region.

論文目次

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

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指導教授

潘敏俊(PAN MIN CHUN)

審核日期

2016-7-27

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