Proceedings of the 9th IFToMM International Conference on Rotor Dynamics

Front Matter....Pages i-xxx
Front Matter....Pages 1-1
Vibration Sensitivity of Large Turbine Generator Shaft Trains to Unbalance....Pages 3-14
Turbomachinery High Speed Modal Balancing: Modeling and Testing of Scale Rotors....Pages 15-25
Application of Turbine Generator Train Rotordynamic Analysis for Setting Residual Modal Unbalance Requirements for High Speed Balancing of a Single Rotor....Pages 27-37
Development of a New Balancing Approach for Significantly Eccentric or Bowed Rotors....Pages 39-50
Conditions Required for the Elimination of Trial Runs During the Balancing of Flexible Rotors....Pages 51-61
Front Matter....Pages 63-63
Blade Vibration Measurements and Excitation Force Evaluation....Pages 65-78
Influence of the Blades Configuration on the Dynamics of a 3-Bladed Jeffcott Rotor....Pages 79-87
Forced Vibration of Eight Mistuned Bladed Discs on a Solid Shaft—Excitation of the Second Compressor Bladed Disc....Pages 89-100
Vibration Response Analysis of Mistuned Bladed Disk Consisting of Directionally Solidified Blade....Pages 101-111
The Influence of Blade Row Dynamics on Lateral and Torsional Shaft Vibrations in Steam Turbines....Pages 113-127
Explanation of the Snubbing Mechanism on Vibration Reduction by Means of Chaos Metrics....Pages 129-141
Efficient Modelling of Rotor-Blade Interaction Using Substructuring....Pages 143-153
Modeling Impulse Periodic Excitation of Blade Rows in Steam Turbines in Partial Arc Admission Conditions....Pages 155-168
An Improved Microslip Model for Variable Normal Loads....Pages 169-179
Nonlinear Behavior Analysis Caused by Blade Tip Rubbing in a Rotor-Disk-Blade System....Pages 181-191
Front Matter....Pages 193-193
Analysis of Dry Friction-Induced Stick-Slip in an Experimental Test Rig Modeling a Drill String....Pages 195-204
The Resolution of Unwanted Vibrations in Rotating Machinery....Pages 205-220
Designing and Operating Rotating Machinery Free from Vibration Troubles Based on Case Studies....Pages 221-231
Keyphasor® Based Torsional Vibration Detection and Field Applications....Pages 233-253
Behavior of Eccentric Rotors Through the Critical Speed Range....Pages 255-266
Front Matter....Pages 193-193
Evaluation of Unexpected High Vibration on a High Speed Coupling Spacer....Pages 267-280
Analysis of Super-Synchronous, Sub-mesh Frequency Vibrations in a Speed Increaser Gearbox....Pages 281-295
Optimization of Low Frequency Balancing of GD-40 Rotor....Pages 297-306
Analysis and Experimental Test of a 200 kW Oil-Free Micro Gas Turbine Simulator....Pages 307-319
Front Matter....Pages 321-321
FEM Analysis of the SIF in Rotating Shafts Containing Breathing Elliptical Cracks....Pages 323-333
Damping in a Parametrically Excited Cracked Rotor....Pages 335-345
Experimental and Numerical Analysis of Transversal Open Cracked Shafts Considering Beam Slenderness and Crack Depth....Pages 347-359
Experimental Identification of Rotor Crack Forces....Pages 361-371
Experimental Analysis and Validation of a Vibration-Based Technique for Crack Detection in a Shaft....Pages 373-383
Front Matter....Pages 385-385
Fault Diagnosis and State Detection in Centrifugal Pumps—A Review of Applications....Pages 387-398
Tracking the Damage Level in Rolling Element Bearings....Pages 399-407
Order Tracking Under Run-Up and Run-Down Conditions....Pages 409-420
A Novel Procedure for the Selection of the Frequency Band in the Envelope Analysis for Rolling Element Bearing Diagnostics....Pages 421-430
Modelling Roller Bearing Dynamics Inducing Instantaneous Angular Speed Variations....Pages 431-442
Non-linear Elasto-dynamic Model of Faulty Rolling Elements Bearing....Pages 443-454
Architecture of the Monitoring System for the Traction System Bearings of a Regional Locomotive....Pages 455-464
Monitoring the Dynamic Behavior in Polar Domain for an Easier Diagnostic of Rotating Machinery....Pages 465-473
Signal Processing Techniques for the Identification of Wheels’ Imbalance in Presence of Disturbances....Pages 475-483
Use of Chaos in the Diagnostics of Rolling Element Bearings....Pages 485-495
Model Based Automated Diagnosis of Bearing Knock Faults in Internal Combustion Engines....Pages 497-507
Front Matter....Pages 385-385
Low Speed Bearings’ Instantaneous Angular Speed Behavior....Pages 509-519
Instantaneous Angular Speed Analysis, Measurement Errors and Signal Filtering....Pages 521-531
Optimisation of SVM Methodology for Multiple Fault Taxonomy of Rolling Bearings from Acceleration Records....Pages 533-542
Use of Acoustic Emissions for the Detection of Rub of Rotors....Pages 543-553
Multi Fault Diagnosis of the Centrifugal Pump Using the Wavelet Transform and Principal Component Analysis....Pages 555-566
Impact Response Characterization as Basis for Bearing Diagnostics and Prognostics....Pages 567-576
Force Analysis Due to Local Defect in Rolling Bearings for Fault Diagnosis....Pages 577-586
Vibration-Based Spall Size Tracking in Rolling Element Bearings....Pages 587-597
Front Matter....Pages 599-599
Rotor Vibrations in Electrical Machines Due to Electromagnetic Forces....Pages 601-611
Experimental Investigation of Structural Damping of Laminated Stacks of Electrical Machine Rotors....Pages 613-624
Investigating Grid-Induced Turbo-Generator Vibrations: A Multidisciplinary Challenge....Pages 625-636
Rotor Vibration Difference Among the Single and the Combined Faults Composed by Static Air-Gap Eccentricity and Rotor Interturn Short Circuit....Pages 637-648
Prediction of Ultimate Coupling Torque During Transient Short-Circuit Loads of Electric Motors....Pages 649-660
Rotordyamic Analysis of a 2-Pole Induction Motor Considering Magnetic Excitation Due to Dynamic Rotor Eccentricity During Startup....Pages 661-676
Front Matter....Pages 677-677
Model-Based Fault Detection on a Non-linear Rotor System....Pages 679-688
Experimental Unbalance Identification by Means of Correlation Analysis and Model Order Reduction....Pages 689-699
Fault Detection in a Rotating Machine by Using the Electromechanical Impedance Method....Pages 701-710
Application of Bayesian Inference to Unbalance Identification in Rotors....Pages 711-721
Application of Multiple-Model Estimation Method to Rotor Fault Diagnosis....Pages 723-733
Application of a Model-Based Method for Balancing a Large Steam Turbo-Generator Unit....Pages 735-743
Front Matter....Pages 677-677
Unbalance Response Analysis of a Heavy Duty Gas Turbine-Generator with Rigid Coupling Offset....Pages 745-756
Residual Unbalance Determination for Flexible Rotors at Operational Speed....Pages 757-768
Model Validation for Damage Identification and Determination of Local Damage Dynamics....Pages 769-778
Experimental Estimation of Misalignment Effects in Rotor-Bearing-Coupling Systems....Pages 779-789
Front Matter....Pages 791-791
Development and Preliminary Validation of Efficient 3D Models of Tilting Pad Journal Bearings....Pages 793-803
The Effects of Temporal Fluid Inertia on Tilting Pad Journal Bearing Dynamics....Pages 805-819
Multilobe Floating Ring Bearings for Automotive Turbochargers....Pages 821-833
Influence of Bearing Geometry of Automotive Turbochargers on the Nonlinear Vibrations During Run-Up....Pages 835-844
Nonlinear Oscillations of High-Speed Rotor Systems in Semi-Floating Ring Bearings....Pages 845-854
Dynamic Forced Performance of Short Length Open-Ends Squeeze Film Damper with End Grooves....Pages 855-866
The Identification Method for Dynamic Characteristics Coefficients of Rotor Sliding Bearing Based on System Lag Angle....Pages 867-882
Effect of Square-Dimple Size on Dynamic Characteristics of Textured Journal Bearings....Pages 883-893
Geometric Discontinuities Identification in Hydrodynamic Bearings....Pages 895-908
Measurement of Drag Torque, Lift off Speed and Rotordynamic Force Coefficients in a Shimmed BFB....Pages 909-919
A Test Rig for Evaluating Tilting-Pad Journal Bearing Characteristics....Pages 921-930
Identification Dynamic Force Coefficients of a Five-Pad Tilting-Pad Journal Bearing....Pages 931-941
Construction and Experimental Application of a Variable Geometry Journal Bearing (VGJB) for the Vibration Suppression of Rotors....Pages 943-954
Multiphysics TEHD Model of a Tilting-Pad Thrust Bearing with Polymeric Layer....Pages 955-968
Efficient Thrust Bearing Model for High-Speed Rotordynamic Applications....Pages 969-980
Performances Degradation of Tilting-Pad Thrust Bearings Due to Electrical Pitting....Pages 981-994
Front Matter....Pages 791-791
A New Approach to Solve for Oil-Whirl and Oil-Whip Limit-Cycle Response....Pages 995-1008
Dynamic Analysis of Rotors Supported on Journal Bearings by Solving Reynolds Equation Using Pseudospectral Method....Pages 1009-1019
Influence of Delayed Yielding of Magnetorheological Oils in Squeeze Film Dampers on the Vibration Attenuation of Rotors....Pages 1021-1032
Successful Elimination of a Pad-Fluttering Phenomenon....Pages 1033-1043
Investigation of the Thermal Effects of Tilting Pad Bearing Interacting with Fluid Seals on the Stability of Rotating Systems....Pages 1045-1056
Geometrical Optimization of Hydrodynamic Journal Bearings with Validated Simulations and Artificial Intelligence Tools....Pages 1057-1067
A Theoretical Study on Frequency Effects on Tilting-Pad Journal Bearing Dynamic Coefficients....Pages 1069-1080
Stability Analysis of an Unbalanced Journal Bearing with Nonlinear Hydrodynamic Forces....Pages 1081-1090
Analysis of the Influence of Fluid Temperature Variation on the Behavior of Turbocharger Lubricated Thrust Bearings....Pages 1091-1101
Dynamics Analysis of Flexible Rotor Supported by Floating Ring Bearings....Pages 1103-1113
Control of Rotor Motion Using Active Fluid-Film Bearings....Pages 1115-1122
Thermal Effects in Hydrodynamic Cylindrical Bearings....Pages 1123-1133
Temperature Influence on the Behavior of a Magnetorheological Fluid Journal Bearing....Pages 1135-1144
Test Rig Characterization and Dynamic Testing of a Smart Electro-Magnetic Actuator Journal Integrated Bearing....Pages 1145-1156
Effects of Rough Bearing Surface on the Stochastic Dynamics of a Rotor-Bearing System Subject to Random Fluid-Induced Forces....Pages 1157-1166
Front Matter....Pages 1167-1167
On the Dynamics of a Rigid Rotor with Static Unbalance Symmetrically Mounted in Compliant Air Bearings....Pages 1169-1181
Thermal Studies on Foil Bearings with a Sliding Coating Made of Plastic Material....Pages 1183-1193
Parametric Study of Dynamic Analysis Focusing on the Foil Structure of a Gas Foil Journal Bearing....Pages 1195-1206
Static and Dynamic Analyses of a Rotor with Aerostatic Ceramic Porous Journal....Pages 1207-1221
Fluid Flow and Thermal Features of Gas Foil Thrust Bearings at Moderate Operating Temperatures....Pages 1223-1233
Front Matter....Pages 1167-1167
The Dynamics of the Laboratory Rotor Founded on the Gas Foil Bearings—Numerical Analysis....Pages 1235-1246
Numerical and Experimental Investigation of Rotor-Simulator in Foil Gasdynamic Bearings for Compact Gas Turbine....Pages 1247-1258
Non-linear Stability Analysis of a Modified Gas Foil Bearing Structure....Pages 1259-1276
Prediction of Stiffness Coefficients for Foil Air Bearings to Perform Rotordynamic Analysis of Turbomachinery....Pages 1277-1288
Externally Pressurized Gas Journal Bearings with Asymmetric Gas Supply (Verification of Availability of Gas Pressure Control Using a Small Size Test Rig)....Pages 1289-1299
Front Matter....Pages 1301-1301
Dynamic Modelling of Gear System with Gyroscopic Effect and Crack Detection Analysis....Pages 1303-1314
Study on Nonlinear Meshing Stiffness of Spline....Pages 1315-1321
Research on Dynamic Modeling and Analysis of the Coupled Planetary Gear and Rotor System....Pages 1323-1331
Effect of Gear Tooth Breakage on the Dynamic Response in a Wind Turbine Drive Train Subjected to Stochastic Load Excitation....Pages 1333-1343
On the Diagnostics of Planet Gear Bearings....Pages 1345-1355
Dynamic Characterization of Wind Turbine Gearboxes in Operational Conditions....Pages 1357-1368
The Torsional Stiffness of Involute Spur Planetary Gears....Pages 1369-1379
Planet Eccentricity Error on a Planetary Gear Transmission: Influence on Load Sharing....Pages 1381-1390
Rotordynamic Analysis for Integrally Geared Air Compressor Using Measured Dynamic Coefficients of Tilting Pad Journal Bearings....Pages 1391-1404
Front Matter....Pages 1405-1405
Rotor Active Vibration Control via Internal Magnetic Bearings and a Concentric Inner Shaft Coupling....Pages 1407-1414
Vibration Control of Rotor Shaft Systems Using Electromagnetic Actuator....Pages 1415-1429
Experimental Estimation of Speed-Dependent Active Magnetic Bearing Rotordynamic Parameters....Pages 1431-1440
Stability Study for Vibration Control of an Active Magnetic Bearing Supported Rotor Mounted on a Moving Base....Pages 1441-1452
Eigenvalue Assignment for Stabilizing Unstable Conical Modes of Rigid Rotor-Active Magnetic Bearing System Over High Rotational Speed Range....Pages 1453-1464
Rotordynamic Behavior and Performance of Controllable Hybrid Foil-Magnetic Bearing....Pages 1465-1476
Front Matter....Pages 1405-1405
Passive Magnetic Bearings at the Rotary Application....Pages 1477-1487
Dynamic Analysis of the High-Speed Flexible Rotors Supported on the Electrodynamic Passive Magnetic Bearings....Pages 1489-1500
Experimental Assessment of Touchdown Bearing Contact Forces in Magnetic Bearing Systems....Pages 1501-1511
A Contact Event Model for an AMB-supported Rotor....Pages 1513-1523
Front Matter....Pages 1525-1525
Internal Sensing and Actuation Strategies for Smart Machine Rotors....Pages 1527-1537
Assessment of Numerical Model to Determination of Parameters to Stability Experimental Tests....Pages 1539-1550
Experimental Observations of Rotor Orbit Analysis in Rotating Machines....Pages 1551-1560
Experimental Study on the Dynamic Characteristics of Spline Joint in Rotor System....Pages 1561-1570
Front Matter....Pages 1571-1571
Capturing the Dynamics of Rotating Machines: A Modern Global Approach Based on SAMCEF Rotor....Pages 1573-1580
An Innovative Rotordynamical Model for Coupled Flexural-Torsional Vibrations in Rotating Machines....Pages 1581-1591
Vibration Control in Electrical Machines Using Built-in Actuator....Pages 1593-1603
Inclusion of Unsteady Bow in a Model-Based Monitoring System for Rotors....Pages 1605-1615
Development and Validation of Efficient Rotordynamical Models for Complex Rotating Systems....Pages 1617-1627
Non-linear Analysis of the Defects of a Vertical Turbine....Pages 1629-1640
A Method for Assessing the Turbine Generator Set Shaft-Line Behavior in Accidental Situations....Pages 1641-1651
Effect of Unbalanced Rotor on the Dynamics of Cylindrical Roller Bearings....Pages 1653-1663
Vibration Analysis of Fiber Reinforced Composite Discs....Pages 1665-1675
Numerical Studies of a Nonlinear Flexible Rotating System Under Harmonic Ground Motion....Pages 1677-1687
Analysis of Rotating Systems Using General-Purpose Multibody Dynamics....Pages 1689-1701
Dynamic Absorbers for Rotating Machinery....Pages 1703-1714
Front Matter....Pages 1571-1571
Application of Optimization Methods in Rotor Dynamics....Pages 1715-1725
EHD Modeling of Angular Contact Ball Element Bearings....Pages 1727-1739
Controllers for Attenuation of Lateral Rotor Vibration Part I: Controller Design....Pages 1741-1751
Controllers for Attenuation of Lateral Rotor Vibration Part II: Controller Optimization and Comparison....Pages 1753-1762
Controlled Modal Energy Transfer in Torsional Systems Using Impulsive Parametric Excitation....Pages 1763-1773
Controlling Non-linear Axial Vibrations of a Turbine Rotor....Pages 1775-1784
Prediction of Rotor Dynamic Behavior of Synchronous Generators....Pages 1785-1795
Towards Determination of Critical Speeds of a Rotating Shaft with Eccentric Sleeves: Equations of Motion....Pages 1797-1808
Studying Continuum Dynamic Behaviour Through Rigid Multibody Dynamics....Pages 1809-1822
Nonlinear Dynamic Analysis of Ball Bearings Due to Varying Number of Balls and Centrifugal Force....Pages 1823-1830
Sensitivity Analysis on the Dynamic Characteristics of a 1000 MW Turbo-Generator Rotor....Pages 1831-1840
Prediction Capabilities of Coriolis and Gyroscopic Effects in Current Finite Element Software....Pages 1841-1852
A Parameter Preserving Model Order Reduction Algorithm for Rotordynamic Systems....Pages 1853-1862
Finite Element Modeling and Vibration Analysis of a Free Power Turbine Subjected to Non-synchronous Excitation....Pages 1863-1873
Front Matter....Pages 1875-1886
Rotor-Dynamic Computer Simulations of Rolling Bearing in High-Speed Rotating Machinery....Pages 1887-1887
Spherical Roller Bearing Simulation Model with Localized Defects....Pages 1889-1898
Three Case Studies from the UKCS Gas Compressors: Combining Rotor Dynamic and Process Data as an Aid to Diagnosis....Pages 1899-1909
Correlation Between Friction Coefficient and Sound Characteristics for Cage Instability of Cryogenic Deep Groove Ball Bearings....Pages 1911-1920
Front Matter....Pages 1921-1931
Experimental Analysis of Rotor-Stator Contact with Many Degrees of Freedom....Pages 1933-1933
Front Matter....Pages 1935-1944
Rotor-Stator Partial Rub Diagnosis Using Hilbert Huang Transform....Pages 1933-1933
Detecting Rub-Impact Fault of Rotor System Based on Variational Mode Decomposition....Pages 1945-1953
Effect of Rotor-Stator Contact on the Mass Unbalance Response....Pages 1955-1963
Dynamic Response of a High Speed Flexible Rotor Due to Sudden Large Unbalance....Pages 1965-1975
Front Matter....Pages 1977-1990
Investigations on Non-steady Behaviour of Rotors Due to Light Rubbing to Brush Seals....Pages 1991-1991
Non-linear Analysis of Floating Ring Annular Seals: Stability and Impacts....Pages 1993-2005
Effects of Clearance on Leakage Flow Characteristics of Labyrinth Brush Seal....Pages 2007-2018
Dynamic Analysis of a Non-contacting Finger Seal....Pages 2019-2029
Front Matter....Pages 2031-2042
On the Stabilizing Effect of Support Asymmetry in Rotordynamics....Pages 2043-2043
Periodic Stability and Sensitivity Analysis of Rotating Machinery....Pages 2045-2057
Numerical Analysis on the Nonlinear Hysteresis Phenomenon Associated with Instability of a Steam Turbine Rotor-Bearing System....Pages 2059-2070
Stability Analysis and Assessment of Rotor Trains Using Operational Modal Analysis....Pages 2071-2081
Stability Analysis Based on Energy Balance of Motion of the Gyroscopic Exercise Tool....Pages 2083-2093
Front Matter....Pages 2095-2108
Development and Validation of a Model to Describe the Bearings Interaction in Rotating Machines Due to Elastic Supporting Structures....Pages 2109-2109
Influence of the Supporting Structure Dynamic Behaviour on the Shaft Vibration of a Real Rotating Machine....Pages 2111-2122
Development and Preliminary Validation of a New Strategy to Model the Interaction Between Rotating Machines and Elastic Supporting Structure....Pages 2123-2136
Evaluation of Pedestal Stiffness Variations in Steel Supported Structures for Steam Turbines....Pages 2137-2148
Modeling and Experimental Characterization of Resilient Supports for Turbomolecular Pumps....Pages 2149-2164
Experimental Evaluation of a Modal Parameter Based Foundation Identification Procedure....Pages 2165-2176
Modeling of Visco-elastic Supports for Hydropower Applications....Pages 2177-2187
Front Matter....Pages 2189-2197
Theoretical Modeling for a Rotor-Bearing-Foundation System and Its Dynamic Characteristics Analysis....Pages 2109-2109
Non-linear Behavior and Loading Capability of the Spring Support in Lateral Response....Pages 2199-2214
Front Matter....Pages 2215-2228
Thermal Unbalance Behaviour of Turbogenerator Rotors....Pages 2229-2229
New Mathematical Model for the Morton Effect Based on the THD Analysis....Pages 2231-2242
Similarity Analysis of Spiral Vibration Behavior on Large Turbomachinery Shaft Lines....Pages 2243-2253
A New Approach for Thermo-Elastic Equations to Predict Spiral Vibrations in Turbogenerator Shafts....Pages 2255-2265
Thermoelastic Steam Turbine Rotor Control Based on Neural Network....Pages 2267-2281
....Pages 2283-2294