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Produktbild: Machinery Vibration and Rotordynamics

Machinery Vibration and Rotordynamics

224,99 €

inkl. gesetzl. MwSt., Versandkostenfrei


Beschreibung

Produktdetails

Einband

Gebundene Ausgabe

Erscheinungsdatum

24.05.2010

Verlag

John Wiley & Sons

Seitenzahl

416

Maße (L/B/H)

24,4/16,2/2,9 cm

Gewicht

686 g

Auflage

1. Auflage

Sprache

Englisch

ISBN

978-0-471-46213-2

Beschreibung

Produktdetails

Einband

Gebundene Ausgabe

Erscheinungsdatum

24.05.2010

Verlag

John Wiley & Sons

Seitenzahl

416

Maße (L/B/H)

24,4/16,2/2,9 cm

Gewicht

686 g

Auflage

1. Auflage

Sprache

Englisch

ISBN

978-0-471-46213-2

Herstelleradresse

Libri GmbH
Europaallee 1
36244 Bad Hersfeld
DE

Email: gpsr@libri.de

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  • Produktbild: Machinery Vibration and Rotordynamics
  • Preface xiii

    1 Fundamentals of Machine Vibration and Classical Solutions 1

    The Main Sources of Vibration in Machinery 1

    The Single Degree of Freedom (SDOF) Model 4

    Using Simple Models for Analysis and Diagnostics 6

    Six Techniques for Solving Vibration Problems with Forced Excitation 13

    Some Examples with Forced Excitation 15

    Illustrative Example 1 15

    Illustrative Example 2 17

    Illustrative Example 3 20

    Illustrative Example 4 24

    Some Observations about Modeling 27

    Unstable Vibration 28

    References 30

    Exercises 30

    2 Torsional Vibration 35

    Torsional Vibration Indicators 36

    Objectives of Torsional Vibration Analysis 37

    Simplified Models 38

    Computer Models 45

    Kinetic Energy Expression 46

    Potential Energy 46

    Torsional Vibration Measurement 51

    French's Comparison Experiments 53

    Strain Gages 53

    Carrier Signal Transducers 54

    Frequency-modulated Systems 55

    Amplitude-modulated Systems 56

    Frequency Analysis and the Sideband System 57

    French's Test Procedure and Results 59

    A Special Tape for Optical Transducers 61

    Time-interval Measurement Systems 62

    Results from Toram's Method 65

    Results from the Barrios/Darlow Method 67

    References 68

    Exercises 69

    3 Introduction to Rotordynamics Analysis 71

    Objectives of Rotordynamics Analysis 72

    The Spring-Mass Model 74

    Synchronous and Nonsynchronous Whirl 77

    Analysis of the Jeffcott Rotor 78

    Polar Coordinates 79

    Cartesian Coordinates 80

    Physical Significance of the Solutions 81

    Three Ways to Reduce Synchronous Whirl Amplitudes 82

    Some Damping Definitions 83

    The "Gravity Critical" 83

    Critical Speed Definitions 84

    Effect of Flexible (Soft) Supports 84

    Rotordynamic Effects of the Force Coefficients-A Summary 90

    The Direct Coefficients 90

    The Cross-coupled Coefficients 91

    Rotordynamic Instability 91

    Effect of Cross-Coupled Stiffness on Unbalance Response 99

    Added Complexities 100

    Gyroscopic Effects 101

    Effect of Support Asymmetry on Synchronous Whirl 107

    False Instabilities 110

    References 112

    Exercises 114

    4 Computer Simulations of Rotordynamics 119

    Different Types of Models 119

    Bearing and Seal Matrices 126

    Torsional and Axial Models 127

    Different Types of Analyses 128

    Eigenanalysis 129

    Linear Forced Response (LFR) 133

    Transient Response 134

    Shaft Modeling Recommendations 135

    How Many Elements 135

    45-Degree Rule 137

    Interference Fits 138

    Laminations 139

    Trunnions 140

    Impeller Inertias via CAD Software 140

    Stations for Added Weights 142

    Rap Test Verification of Models 143

    Stations for Bearings and Seals 143

    Flexible Couplings 144

    Example Simulations 146

    Damped Natural Frequency Map (NDF) 147

    Modal Damping Map 149

    Root Locus Map 151

    Undamped Critical Speed Map 151

    Mode Shapes 157

    Bode/Polar Response Plot 160

    Orbit Response Plot 163

    Bearing Load Response Plot 164

    Operating Deflected Shape (ODS) 165

    Housing Vibration (ips and g's) 168

    References 168

    5 Bearings and Their Effect on Rotordynamics 171

    Fluid Film Bearings 171

    Fixed-geometry Sleeve Bearings 174

    Variable-geometry Tilting Pad Bearings 185

    Fluid Film Bearing Dynamic Coefficients and Methods of Obtaining Them 190

    Load Between Pivots Versus Load on Pivot 195

    Influence of Preload on the Dynamic Coefficients in Tilt Pad Bearings 201

    Influence of the Bearing Length or Pad Length 203

    Influence of the Pivot Offset 204

    Influence of the Number of Pads 205

    Ball and Rolling Element Bearings 208

    Case Study: Bearing Support Design for a Rocket Engine Turbopump 209

    Ball Bearing Stiffness Measurements 213

    Wire Mesh Damper Experiments and Computer Simulations 214

    Squeeze Film Dampers 216

    Squeeze Film Damper without a Centering Spring 217

    O-ring Supported Dampers 220

    Squirrel Cage Supported Dampers 223

    Integral Squeeze Film Dampers 224

    Squeeze Film Damper Rotordynamic Force Coefficients 225

    Applications of Squeeze Film Dampers 226

    Optimization for Improving Stability in a Centrifugal Process Compressor 226

    Using Dampers to Improve the Synchronous Response 232

    Using the Damper to Shift a Critical Speed or a Resonance 236

    Insights into the Rotor-Bearing Dynamic Interaction with Soft/Stiff Bearing Supports 238

    Influence on Natural Frequencies with Soft/Stiff Bearing Supports 240

    Effects of Mass Distribution on the Critical Speeds with Soft/Stiff Bearing Supports 243

    Influence of Overhung Mass on Natural Frequencies with Soft/Stiff Supports 252

    Influence of Gyroscopic Moments on Natural Frequencies with Soft/Stiff Bearing Supports 255

    References 264

    Exercises 267

    Appendix: Shaft With No Added Weight 269

    6 Fluid Seals and Their Effect on Rotordynamics 271

    Function and Classification of Seals 271

    Plain Smooth Seals 274

    Floating Ring Seals 276

    Conventional Gas Labyrinth Seals 277

    Pocket Damper Seals 283

    Honeycomb Seals 285

    Hole-pattern Seals 287

    Brush Seals 289

    Understanding and Modeling Damper Seal Force Coefficients 291

    Alford's Hypothesis of Labyrinth Seal Damping 292

    Cross-coupled Stiffness Measurements 295

    Invention of the Pocket Damper Seal 295

    Pocket Damper Seal Theory 299

    Rotordynamic Testing of Pocket Damper Seals 300

    Impedance Measurements of Pocket Damper Seal Force Coefficients (Stiffness and Damping) and Leakage at Low Pressures 301

    The Fully Partitioned PDS Design 304

    Effects of Negative Stiffness 310

    Frequency Dependence of Damper Seals 313

    Laboratory Measurements of Stiffness and Damping from Pocket Damper Seals at High Pressures 317

    The Conventional Design 317

    The Fully Partitioned Design 319

    Field Experience with Pocket Damper Seals 325

    Two Back-to-Back Compressor Applications 325

    Case 1 325

    Case 2 328

    A Fully Partitioned Application 332

    Designing for Desired Force Coefficient Characteristics 336

    The Conventional PDS Design 337

    The Fully Partitioned Pocket Damper Seal 340

    Leakage Considerations 343

    Some Comparisons of Different Types of Annular Gas Seals 347

    References 348

    7 History of Machinery Rotordynamics 353

    The Foundation Years, 1869-1941 354

    Shaft Dynamics 355

    Bearings 360

    Refining and Expanding the Rotordynamic Model, 1942-1963 363

    Multistage Compressors and Turbines, Rocket Engine Turbopumps, and Damper Seals, 1964-Present 368

    Stability Problems with Multistage Centrifugal Compressors 370

    Kaybob, 1971-72 370

    Ekofisk, 1974-75 373

    Subsequent Developments 381

    New Frontiers of Speed and Power Density with Rocket Engine Turbopumps 382

    The Space Shuttle Main Engine (SSME) High-pressure Fuel Turbopump (HPFTP) Rotordynamic Instability Problem 382

    Noncontacting Damper Seals 385

    Shaft Differential Heating (The Morton Effect) 386

    References 388

    Index 393