Paolo Pennacchi

Editor

Proceedings of the 9thIFToMM International

Conference on Rotor

Dynamics

Volume 1

Springer

Contents

Part I Balancing

Vibration Sensitivity of Large Turbine Generator Shaft Trainsto Unbalance 3

Shuiping Yan and Roland Sievert

Turbomachinery High Speed Modal Balancing: Modelingand Testing of Scale Rotors 15Matteo Bertoneri and Paola Forte

Application of Turbine Generator Train Rotordynamic Analysisfor Setting Residual Modal Unbalance Requirements for HighSpeed Balancing of a Single Rotor 27Max L'vov

Development of a New Balancing Approach for SignificantlyEccentric or Bowed Rotors 39

Zlatan Racic and Marin Racic

Conditions Required for the Elimination of Trial Runs Duringthe Balancing of Flexible Rotors 51Eduardo Preciado

Part II Blade Dynamics

Blade Vibration Measurements and Excitation Force Evaluation 65

Nicolo Bachschmid, Emanuel Pesatori, Simone Bistolfi

and Steven Chatterton

xi

xii Contents

Influence of the Blades Configuration on the Dynamicsof a 3-Bladed Jeffcott Rotor 79

Florian Thiery and Jan-Olov Aidanpaa

Forced Vibration of Eight Mistuned Bladed Discs on a Solid

Shaft—Excitation of the Second Compressor Bladed Disc 89

Romuald Rzadkowski, Artur Maurin and Ryszard Szczepanik

Vibration Response Analysis of Mistuned Bladed Disk Consisting

of Directionally Solidified Blade 101

Yasutomo Kaneko, Kazushi Mori and Hiroharu Ooyama

The Influence of Blade Row Dynamics on Lateral and Torsional

Shaft Vibrations in Steam Turbines 113

N. Bachschmid, G. Salvini, E. Tanzi and E. Pesatori

Explanation of the Snubbing Mechanism on Vibration Reduction

by Means of Chaos Metrics 129

Steven Chatterton, Paolo Pennacchi and Andrea Vania

Efficient Modelling of Rotor-Blade Interaction Using

Substructuring 143

Fadi Dohnal, Eric Knopf and Rainer Nordmann

Modeling Impulse Periodic Excitation of Blade Rows in Steam

Turbines in Partial Arc Admission Conditions 155

N. Bachschmid, E. Tanzi, E. Pesatori and S. Bistolfi

An Improved Microslip Model for Variable Normal Loads 169

Chiara Gastaldi and Muzio M. Gola

Nonlinear Behavior Analysis Caused by Blade Tip Rubbing

in a Rotor-Disk-Blade System 181

Hui Ma, Zhiyuan Wu, Xingyu Tai, Chaofeng Li and Bangchun Wen

Part III Case Histories

Analysis of Dry Friction-Induced Stick-Slip in an ExperimentalTest Rig Modeling a Drill String 195

Bruno Cayres, Cesar da Fonseca, Adriano Santos and Hans I. Weber

The Resolution of Unwanted Vibrations in Rotating Machinery 205R. Gordon Kirk

Contents xiii

Designing and Operating Rotating Machinery Free from VibrationTroubles Based on Case Studies 221

Masato Tanaka

Keyphasor® Based Torsional Vibration Detection and FieldApplications 233

Huageng Luo, Roengchai Chumai, Nicolas Peton and Arun Menon

Behavior of Eccentric Rotors Through the Critical Speed Range 255Zlatan Racic and Marin Racic

Evaluation of Unexpected High Vibration on a High Speed

Coupling Spacer 267R.G. Kirk, K.A. Schoeneck and E.A. Memmott

Analysis of Super-Synchronous, Sub-mesh Frequency Vibrations

in a Speed Increaser Gearbox 281

C. Hunter Cloud, James M. Byrne, Minhui He, Jose A. Vazquezand Timothy J. Hattenbach

Optimization of Low Frequency Balancing of GD-40 Rotor 297

Vladimir Shahrinov and Oleg Sliva

Analysis and Experimental Test of a 200 kW Oil-Free Micro

Gas Turbine Simulator 307

Bonjin Koo, Chang-Ho Kim, Jong Sung Lee, Tae Ho Kim

and Kyuho Sim

Part IV Cracks in Rotating Shafts

FEM Analysis of the SIF in Rotating Shafts Containing BreathingElliptical Cracks 323

Patricia Rubio, Belen Muiioz-Abella and Lourdes Rubio

Damping in a Parametrically Excited Cracked Rotor 335

Jerzy T. Sawicki and Zbigniew Kulesza

Experimental and Numerical Analysis of Transversal OpenCracked Shafts Considering Beam Slenderness and Crack Depth .... 347Rafael Garcia-Illescas, Julio C. Gomez-Mancilla and Luigi Bregant

XIVContents

Experimental Identification of Rotor Crack Forces361

C. Shravankumar, R. Tiwari and A. Mahibalan

Experimental Analysis and Validation of a Vibration-Based

Technique for Crack Detection in a Shaft 373

Maria J. Gomez, Cristina Castejon, Juan C. Garria-Prada

and Jesus Lopez

Part V Diagnostics

Fault Diagnosis and State Detection in Centrifugal Pumps—A Review

of Applications 387

P. Beckerle, H. Schaede and S. Rinderknecht

Tracking the Damage Level in Rolling Element Bearings 399

Steven Chatterton, Paolo Pennacchi, Andrea Vania

and Pietro Borghesani

Order Tracking Under Run-Up and Run-Down Conditions 409

Michael D. Coats and Robert B. Randall

A Novel Procedure for the Selection of the Frequency Band

in the Envelope Analysis for Rolling Element Bearing Diagnostics .... 421

Steven Chatterton, Paolo Pennacchi, Andrea Vania and Pietro Borghesani

Modelling Roller Bearing Dynamics Inducing Instantaneous

Angular Speed Variations 431

Jose L. Gomez, Adeline Bourdon, Hugo Andre and Didier Remond

Non-linear Elasto-dynamic Model of Faulty Rolling

Elements Bearing 443

Michele Cotogno, Enrico Pedrazzi, Marco Cocconcelli

and Riccardo Rubini

Architecture of the Monitoring System for the Traction

System Bearings of a Regional Locomotive 455

Steven Chatterton, Paolo Pennacchi, Andrea Vania

and Pietro Borghesani

Monitoring the Dynamic Behavior in Polar Domain for an Easier

Diagnostic of Rotating Machinery 465

Jarir Mahfoud and Benjamin Defoy

Contents xv

Signal Processing Techniques for the Identification of Wheels'Imbalance in Presence of Disturbances 475

Marco Tarabini, Andrea Gironacci, Roberto Panzeri

and Diego Scaccabarozzi

Use of Chaos in the Diagnostics of Rolling Element Bearings 485

Steven Chatterton, Paolo Pennacchi, Andrea Vania

and Pietro Borghesani

Model Based Automated Diagnosis of Bearing Knock Faultsin Internal Combustion Engines 497

Jian Chen and Robert Bond Randall

Low Speed Bearings' Instantaneous Angular Speed Behavior 509W. Moustafa, O. Cousinard, F. Bolaers, K. Ait Sghir and J.P. Dron

Instantaneous Angular Speed Analysis, Measurement Errorsand Signal Filtering 521Marco Spagnol and Luigi Bregant

Optimisation of SVM Methodology for Multiple Fault Taxonomyof Rolling Bearings from Acceleration Records 533D.J. Bordoloi and Rajiv Tiwari

Use of Acoustic Emissions for the Detection of Rub of Rotors 543

Eoin Peter Carden and Stefano Morosi

Multi Fault Diagnosis of the Centrifugal Pump Usingthe Wavelet Transform and Principal Component Analysis 555

Berli Kamiel, Kris McKee, Rodney Entwistle, Ilyas Mazhar

and Ian Howard

Impact Response Characterization as Basis for BearingDiagnostics and Prognostics 567Andrea Sanchez Ramirez, Richard Loendersloot, Tiedo Tingaand Giuseppe D'Angelo

Force Analysis Due to Local Defect in Rolling Bearingsfor Fault Diagnosis 577Sidra Khanam, N. Tandon and J.K. Dutt

Vibration-Based Spall Size Tracking in Rolling Element Bearings .... 587Wade A. Smith, Chongqing Hu, Robert B. Randalland Zhongxiao Peng

xvi

Part VI Electromechanical Interaction

Rotor Vibrations in Electrical Machines Due to Electromagnetic

Forces

Mathias Mair, Bernhard Weilharter and Katrin Ellermann

Experimental Investigation of Structural Damping of Laminated

Stacks of Electrical Machine Rotors 613

Marcel Clappier and Lothar Gaul

Investigating Grid-Induced Turbo-Generator Vibrations:

A Multidisciplinary Challenge 625

Frits Petit, Koen De Bauw, Kris Matthys and Sylvain Doucement

Rotor Vibration Difference Among the Single and the Combined

Faults Composed by Static Air-Gap Eccentricity and Rotor

Interturn Short Circuit 637

Yu-Ling He, Fa-Lin Wang, Meng-Qiang Ke and Gui-Ji Tang

Prediction of Ultimate Coupling Torque During Transient

Short-Circuit Loads of Electric Motors 649

Timo P. Holopainen

Rotordyamic Analysis of a 2-Pole Induction Motor Considering

Magnetic Excitation Due to Dynamic Rotor Eccentricity

During Startup 661

Christian Bauer and Ulrich Werner

Part VII Fault Identification

Model-Based Fault Detection on a Non-linear Rotor System 679

Ramakrishnan Ambur, Zhentao Wang, Rudolf Sebastian Schittenhelm

and Stephan Rinderknecht

Experimental Unbalance Identification by Means of Correlation

Analysis and Model Order Reduction 689

Fabio Dalmazzo Sanches and Robson Pederiva

Fault Detection in a Rotating Machine by Using

the Electromechanical Impedance Method 701

Aldemir Ap Cavalini Jr, Roberto Mendes Finzi Neto

and Valder Steffen Jr

Contents

601

Contents xvii

Application of Bayesian Inference to Unbalance Identification

in Rotors 711

Natalia Cezaro Tyminski and Helio Fiori de Castro

Application of Multiple-Model Estimation Method to Rotor

Fault Diagnosis 723Lin Jia, Jianping Jing and Zhiqiang Wang

Application of a Model-Based Method for Balancing a LargeSteam Turbo-Generator Unit 735

Ionel Nistor, Philippe Voinis, Mohamed-Amine Hassini,Romain Lacombe and Paolo Pennacchi

Unbalance Response Analysis of a Heavy Duty GasTurbine-Generator with Rigid Coupling Offset 745Jin Woong Ha and Dae Seok Jung

Residual Unbalance Determination for Flexible Rotors

at Operational Speed 757

Eric Knopf, Thomas Kriiger and Rainer Nordmann

Model Validation for Damage Identification and Determination

of Local Damage Dynamics 769

Ryan J. Madden, Alexander H. Pesch and Jerzy T. Sawicki

Experimental Estimation of Misalignment Effects

in Rotor-Bearing-Coupling Systems 779

Mohit Lai and Rajiv Tiwari

Part VIII Fluid Film Bearings

Development and Preliminary Validation of Efficient 3D Models

of Tilting Pad Journal Bearings 793Roberto Conti, Amedeo Frilli, Emanuele Galardi, Enrico Meli,

Daniele Nocciolini, Luca Pugi, Andrea Rindi and Stefano Rossin

The Effects of Temporal Fluid Inertia on Tilting Pad Journal

Bearing Dynamics 805

Minhui He, C. Hunter Cloud and Jose A. Vazquez

Multilobe Floating Ring Bearings for Automotive Turbochargers .... 821

Rob Eling, Ron van Ostayen and Daniel Rixen

xviii Contents

Influence of Bearing Geometry of Automotive Turbochargers

on the Nonlinear Vibrations During Run-Up 835

Elmar Woschke, Stefan Gobel, Steffen Nitzschke, Christian Daniel

and Jens Strackeljan

Nonlinear Oscillations of High-Speed Rotor Systems

in Semi-Floating Ring Bearings 845

Aydin Boyaci and Bernhard Schweizer

Dynamic Forced Performance of Short Length Open-Ends SqueezeFilm Damper with End Grooves 855

Luis San Andres, Sung-Hwa Jeung and Gary Bradley

The Identification Method for Dynamic Characteristics Coefficients

of Rotor Sliding Bearing Based on System Lag Angle 867

Guangfu Bin, Longkai Wang, Kun Feng and Xuejun Li

Effect of Square-Dimple Size on Dynamic Characteristics

of Textured Journal Bearings 883

Hiroyuki Yamada, Satoru Kaneko and Hiroo Taura

Geometric Discontinuities Identification in Hydrodynamic

Bearings 895

Tiago H. Machado and Katia L. Cavalca

Measurement of Drag Torque, Lift off Speed and Rotordynamic

Force Coefficients in a Shimmed BFB 909

Luis San Andres and Joshua Norsworthy

A Test Rig for Evaluating Tilting-Pad Journal BearingCharacteristics 921

Steven Chatterton, Paolo Pennacchi, Phuoc Vinh Dang

and Andrea Vania

Identification Dynamic Force Coefficients of a Five-Pad

Tilting-Pad Journal Bearing 931

Steven Chatterton, Paolo Pennacchi, Phuoc Vinh Dangand Andrea Vania

Construction and Experimental Application of a Variable

Geometry Journal Bearing (VGJB) for the Vibration

Suppression of Rotors 943

Athanasios Chasalevris and Fadi Dohnal

Contents xix

Multiphysics TEHD Model of a Tilting-Pad Thrust Bearingwith Polymeric Layer 955Steven Chatterton, Paolo Pennacchi and Andrea Vania

Efficient Thrust Bearing Model for High-SpeedRotordynamic Applications 969I. Chatzisavvas, A. Boyaci and B. Schweizer

Performances Degradation of Tilting-Pad Thrust BearingsDue to Electrical Pitting 981Steven Chatterton, Paolo Pennacchi and Andrea Vania

A New Approach to Solve for Oil-Whirl and Oil-WhipLimit-Cycle Response 995Min Zhang

Dynamic Analysis of Rotors Supported on Journal Bearingsby Solving Reynolds Equation Using Pseudospectral Method 1009Sudhakar Gantasala, I.R. Praveen Krishna and A.S. Sekhar

Influence of Delayed Yielding of Magnetorheological Oilsin Squeeze Film Dampers on the Vibration Attenuation of Rotors .... 1021J. Zapomel and P. Ferfecki

Successful Elimination of a Pad-Fluttering Phenomenon 1033Andrea Vania, Paolo Pennacchi and Steven Chatterton

Investigation of the Thermal Effects of Tilting Pad BearingInteracting with Fluid Seals on the Stability of Rotating Systems 1045

Gregory Bregion Daniel, Antonio Carlos S.G.P. Carneiroand Katia Lucchesi Cavalca

Geometrical Optimization of Hydrodynamic Journal Bearingswith Validated Simulations and Artificial Intelligence Tools 1057Luca Gorasso, Liqin Wang and Chiara Gorasso

A Theoretical Study on Frequency Effects on Tilting-PadJournal Bearing Dynamic Coefficients 1069

Thomas Hagemann and Hubert Schwarze

Stability Analysis of an Unbalanced Journal Bearingwith Nonlinear Hydrodynamic Forces 1081Radhouane Sghir and Mnaouar Chouchane

xxContents

Analysis of the Influence of Fluid Temperature Variation

on the Behavior of Turbocharger Lubricated Thrust Bearings 1091

Leonardo C. Vieira, Paula N. Watanabe and Katia L. Cavalca

Dynamics Analysis of Flexible Rotor Supported by Floating

Ring Bearings 1103

Pavel Taranenko, Oleg Sliva and Elena Zadorozhnaya

Control of Rotor Motion Using Active Fluid-Film Bearings 1115

Leonid Savin and Denis Shutin

Thermal Effects in Hydrodynamic Cylindrical Bearings 1123

Diogo Stuani Alves, Gregory Bregion Daniel

and Katia Lucchesi Cavalca

Temperature Influence on the Behavior of a MagnetorheologicalFluid Journal Bearing 1135

Dimitrios A. Bompos and Pantelis G. Nikolakopoulos

Test Rig Characterization and Dynamic Testing of a Smart

Electro-Magnetic Actuator Journal Integrated Bearing 1145

A. El-Shafei, A.S. Dimitri, T. Saqr and M. El-Hakim

Effects of Rough Bearing Surface on the Stochastic Dynamicsof a Rotor-Bearing System Subject to Random

Fluid-Induced Forces 1157

Zigang Li and Jun Jiang

Part IX Gas Foil Bearings

On the Dynamics of a Rigid Rotor with Static Unbalance

Symmetrically Mounted in Compliant Air Bearings 1169

Christoph Baum, Hartmut Hetzler and Wolfgang Seemann

Thermal Studies on Foil Bearings with a Sliding CoatingMade of Plastic Material 1183

Jan Kicinski, Grzegorz Zywica and Pawel Baginski

Parametric Study of Dynamic Analysis Focusing on the Foil

Structure of a Gas Foil Journal Bearing 1195

Bok Seong Choe, Se Na Jeong, Eo Jin Kim and Yong-Bok Lee

Contents xxi

Static and Dynamic Analyses of a Rotor with AerostaticCeramic Porous Journal 1207

Luis Renato Chiarelli and Zilda de Castro Silveira

Fluid Flow and Thermal Features of Gas Foil Thrust

Bearings at Moderate Operating Temperatures 1223Abdelrasoul M. Gad and Shigehiko Kaneko

The Dynamics of the Laboratory Rotor Founded on the GasFoil Bearings—Numerical Analysis 1235Slawomir Banaszek, Grzegorz Zywica, Jan Kicinskiand Malgorzata Bogulicz

Numerical and Experimental Investigation of Rotor-Simulatorin Foil Gasdynamic Bearings for Compact Gas Turbine 1247

Joury Temis, Mikhail Temis, Andrey Egorov and Valentin Gavrilov

Non-linear Stability Analysis of a Modified Gas Foil BearingStructure 1259

Robert Hoffmann, Tomasz Pronobis and Robert Liebich

Prediction of Stiffness Coefficients for Foil Air Bearingsto Perform Rotordynamic Analysis of Turbomachinery 1277Y.A. Ravikovich, Y.I. Ermilov, A.O. Pugachev, A.A. Matushkin

and D.P. Kholobtsev

Externally Pressurized Gas Journal Bearings with AsymmetricGas Supply (Verification of Availability of Gas Pressure Control

Using a Small Size Test Rig) 1289Tomohiko Ise, Kazuya Imanishi, Toshihiko Asami,Takahiro Tokumiya, Naoyuki Takada, Fumiyoshi Kimuraand Yoshiyuki Yamaguchi

Part X Geared Machine

Dynamic Modelling of Gear System with Gyroscopic Effectand Crack Detection Analysis 1303

Omar D. Mohammed, Matti Rantatalo and Jan-Olov Aidanpaa

Study on Nonlinear Meshing Stiffness of Spline 1315

Guang Zhao, Juncong Su, Jingyu Zhai, Qingkai Han and Yanyan Shi

xxii Contents

Research on Dynamic Modeling and Analysis of the Coupled

Planetary Gear and Rotor System1323

Hong-Liang Yao, Yang Liu, Zhao-Hui Ren, Bang-Chun Wen

and Chao-Feng Li

Effect of Gear Tooth Breakage on the Dynamic Responsein a Wind Turbine Drive Train Subjected to Stochastic

Load Excitation 1333

P. Srikanth and A.S. Sekhar

On the Diagnostics of Planet Gear Bearings 1345

Gianluca D'Elia, Marco Cocconcelli, Emiliano Mucchi

and Giorgio Dalpiaz

Dynamic Characterization of Wind Turbine Gearboxes

in Operational Conditions 1357

E. Di Lorenzo, S. Manzato, F. Vanhollebeke, S. Goris, B. Peeters,

W. Desmet and F. Marulo

The Torsional Stiffness of Involute Spur Planetary Gears 1369

Song Xue, Rodney Entwistle, Ilyas Mazhar and Ian Howard

Planet Eccentricity Error on a Planetary Gear Transmission:

Influence on Load Sharing 1381

M. Iglesias, A. Fernandez, A. de Juan, A. Diez, P. Garcia and F. Viadero

Rotordynamic Analysis for Integrally Geared Air Compressor

Using Measured Dynamic Coefficients of Tilting Pad

Journal Bearings 1391

Wonhyun Kim, Taeyoung Kim, Dohyeong Lim, Sangpyo Woo

and Wonho Joo

Part XI Magnetic Bearings

Rotor Active Vibration Control via Internal Magnetic Bearingsand a Concentric Inner Shaft Coupling 1407

Chris Lusty, Necip Sahinkaya and Patrick Keogh

Vibration Control of Rotor Shaft Systems Using ElectromagneticActuator 1415

Shivang Shekhar, Nitish Sharma, Hemanta Kumar Roy,

Anindya Sundar Das and Jayanta Kumar Dutt

Contents xxiii

Experimental Estimation of Speed-Dependent Active Magnetic

Bearing Rotordynamic Parameters 1431

Rajiv Tiwari and Talatam Viswanadh

Stability Study for Vibration Control of an Active MagneticBearing Supported Rotor Mounted on a Moving Base 1441Akash Vardhan, Anindya Sundar Das and Jayanta Kumar Dutt

Eigenvalue Assignment for Stabilizing Unstable Conical Modesof Rigid Rotor-Active Magnetic Bearing System Over HighRotational Speed Range 1453Han-Wook Jeon and Chong-Won Lee

Rotordynamic Behavior and Performance of Controllable

Hybrid Foil-Magnetic Bearing 1465Sena Jeong, Bok Seong Choe and Yong Bok Lee

Passive Magnetic Bearings at the Rotary Application 1477Aleksander Olejnik and Krzysztof Falkowski

Dynamic Analysis of the High-Speed Flexible Rotors Supportedon the Electrodynamic Passive Magnetic Bearings 1489Tomasz Szolc and Krzysztof Falkowski

Experimental Assessment of Touchdown Bearing Contact Forces

in Magnetic Bearing Systems 1501Fawaz Y. Saket, M. Necip Sahinkaya and Patrick S. Keogh

A Contact Event Model for an AMB-supported Rotor 1513Oskari Halminen, Antti Karkkainen, Jussi Sopanen and Aki Mikkola

Part XII Miscellanea

Internal Sensing and Actuation Strategies for Smart MachineRotors 1527

Samuel Jimenez, Patrick Keogh and Matthew Cole

Assessment of Numerical Model to Determination of Parameters

to Stability Experimental Tests 1539

Felipe W.S. Tuckmantel, Gregory B. Daniel, Helio F. Castro

and Katia L. Cavalca

xxiv Contents

Experimental Observations of Rotor Orbit Analysis

in Rotating Machines 1551

Akilu Yunusa-Kaltungo, Adrian D. Nembhard and Jyoti K. Sinha

Experimental Study on the Dynamic Characteristics of Spline

Joint in Rotor System 1561

Yanhong Ma, Wang Cun, Dayi Zhang and Jie Hong

Part XIII Modelling and Control

Capturing the Dynamics of Rotating Machines: A Modern

Global Approach Based on SAMCEF Rotor 1573

P. Morelle

An Innovative Rotordynamical Model for CoupledFlexural-Torsional Vibrations in Rotating Machines 1581

Filippo Cangioli, Alice Innocenti, Lorenzo Marini, Enrico Meli,

Luca Pugi and Andrea Rindi

Vibration Control in Electrical Machines Using Built-in Actuator .... 1593

Karuna Kalita, Sivaramakrishnan Natesan, Gaurav Kumar

and Kari Tammi

Inclusion of Unsteady Bow in a Model-Based Monitoring System

for Rotors 1605

Markus Rossner, Thomas Thuemmel and Heinz Ulbrich

Development and Validation of Efficient Rotordynamical Models

for Complex Rotating Systems 1617

Filippo Cangioli, Alice Innocenti, Lorenzo Marini, Enrico Meli,Luca Pugi and Andrea Rindi

Non-linear Analysis of the Defects of a Vertical Turbine 1629

Sebastien Denis, Mohamed-Amine Hassini and Mihai Arghir

A Method for Assessing the Turbine Generator Set Shaft-Line

Behavior in Accidental Situations 1641

Nicolas Guilloteau, Ionel Nistor, Nabila Sellali-Haraigue,Pierre-Yves Couzon and Pierre Verrier

Effect of Unbalanced Rotor on the Dynamics of CylindricalRoller Bearings 1653

Aditya Sharma, M. Amarnath and P.K. Kankar

Contentsxxv

Vibration Analysis of Fiber Reinforced Composite Discs 1665K. Gupta, S.P. Singh, V. Tiwari, Savi Takkar, Rahul Devand Anant Rai

Numerical Studies of a Nonlinear Flexible Rotating SystemUnder Harmonic Ground Motion 1677

Balram Choudhary and Barun Pratiher

Analysis of Rotating Systems Using General-PurposeMultibody Dynamics 1689Alessandro Tasora and Pierangelo Masarati

Dynamic Absorbers for Rotating Machinery 1703Pietro Borghesani, Tommaso Argentini, Marco Belloliand Fabio C. Robustelli

Application of Optimization Methods in Rotor Dynamics 1715Reinhard Helfrich and Nils Wagner

Active Vibration Isolation of a Flexible Rotor Being Subjectto Unbalance Excitation and Gyroscopic Effect UsingWoo-Optimal Control 1727Fabian B. Becker, Stefan Heindel and Stephan Rinderknecht

EHD Modeling of Angular Contact Ball Element Bearings 1741Leticia Bizarre, Fabio Nonato de Paula and Katia L. Cavalca

Controllers for Attenuation of Lateral Rotor Vibration

Part I: Controller Design 1753Rudolf Sebastian Schittenhelm and Stephan Rinderknecht

Controllers for Attenuation of Lateral Rotor Vibration

Part II: Controller Optimization and Comparison 1763Rudolf Sebastian Schittenhelm and Stephan Rinderknecht

Controlled Modal Energy Transfer in Torsional Systems

Using Impulsive Parametric Excitation 1775Thomas Pumhossel, Horst Ecker, Peter Hehenberger and Klaus Zeman

Controlling Non-linear Axial Vibrations of a Turbine Rotor 1785Nicolo Bachschmid, Davide Colombo and Andrea Monterisi

xxvj Contents

Prediction of Rotor Dynamic Behavior of Synchronous Generators . . . 1797

J.S. Rao, Vijendra Gupta, Prachi Khullar and D. Srinivas

Towards Determination of Critical Speeds of a Rotating Shaft

with Eccentric Sleeves: Equations of Motion 1809

Antony Kirk, Fotios Georgiades and Chris Bingham

Studying Continuum Dynamic Behaviour Through Rigid

Multibody Dynamics 1823

Vikas Kumar Kharolia, J.K. Dutt, S.K. Saha and S.V. Shah

Nonlinear Dynamic Analysis of Ball Bearings Due to Varying

Number of Balls and Centrifugal Force 1831

V. Vakharia, V.K. Gupta and P.K. Kankar

Sensitivity Analysis on the Dynamic Characteristics

of a 1000 MW Turbo-Generator Rotor 1841

Van Thanh Ngo, Danmei Xie, Yi Yang, Shang Gao and Jie Guo

Prediction Capabilities of Coriolis and Gyroscopic Effects

in Current Finite Element Software 1853

Valentina Ruffini, Christoph W. Schwingshackl and Jeffrey S. Green

A Parameter Preserving Model Order Reduction Algorithmfor Rotordynamic Systems 1863

Kristin Krenek

Finite Element Modeling and Vibration Analysis of a Free

Power Turbine Subjected to Non-synchronous Excitation 1875

A.O. Pugachev, A.V. Sheremetyev, V.V. Tykhomirovand O.I. Shpilenko

Part XIV Rolling Element Bearings

Rotor-Dynamic Computer Simulations of Rolling Bearing

in High-Speed Rotating Machinery 1889Giacomo Landi, Travis Shive and Fabrizio Mandrile

Spherical Roller Bearing Simulation Modelwith Localized Defects

Behnam Ghalamchi, Jussi Sopanen and Aki Mikkola

1899

Contents xxvii

Three Case Studies from the UKCS Gas Compressors: CombiningRotor Dynamic and Process Data as an Aid to Diagnosis 1911Geraint Jones

Correlation Between Friction Coefficient and Sound Characteristics

for Cage Instability of Cryogenic Deep Groove Ball Bearings 1921SoIJi Ryu, BokSeong Choe, JeonKook Lee and YongBok Lee

Part XV Rub—Rotor to Stator Contact

Experimental Analysis of Rotor-Stator Contact with Many Degreesof Freedom 1935

Oliver Alber

Rotor-Stator Partial Rub Diagnosis Using Hilbert HuangTransform 1945

Sanjin Braut, Roberto Zigulic, Goranka Stimac and Ante Skoblar

Detecting Rub-Impact Fault of Rotor System Based on VariationalMode Decomposition 1955Yanxue Wang and Richard Markert

Effect of Rotor-Stator Contact on the Mass Unbalance Response 1965Celio Duran, Lionel Manin, Marie Ange Andrianoely,Celine Bordegaray, Frederic Battle and Regis Dufour

Dynamic Response of a High Speed Flexible Rotor Dueto Sudden Large Unbalance 1977Xuan Haijun, Luo Ling, Guo Xiaojun and Li Guoqiang

Part XVI Seals

Investigations on Non-steady Behaviour of Rotors Dueto Light Rubbing to Brush Seals 1993Daniel Kreuzer, Robert Fay, Robert Liebich, Sang Werner

and Tobias Wiedemann

Non-linear Analysis of Floating Ring Annular Seals: Stabilityand Impacts 2007Mihai Arghir and Manh-Hung Nguyen

XXVllIContents

Effects of Clearance on Leakage Flow Characteristics

of Labyrinth Brush Seal2019

Yuan Wei, Zhaobo Chen, Yinghou Jiao, Xin Du and Zhouqiang Zhang

Dynamic Analysis of a Non-contacting Finger Seal 2031

Joury Temis, Alexey Selivanov and Ivan Dzeva

Part XVII Stability

On the Stabilizing Effect of Support Asymmetry

in Rotordynamics 2045

Giancarlo Genta

Periodic Stability and Sensitivity Analysis of Rotating Machinery .... 2059

Aykut Tamer and Pierangelo Masarati

Numerical Analysis on the Nonlinear Hysteresis Phenomenon

Associated with Instability of a Steam Turbine

Rotor-Bearing System 2071

Ying Cui, Yongliang Wang and Jingjun Zhong

Stability Analysis and Assessment of Rotor Trains

Using Operational Modal Analysis 2083

Eoin Peter Carden, Niklas Sehlstedt, Kenny Krogh Nielsen,Staffan Lundholm and Stefano Morosi

Stability Analysis Based on Energy Balance of Motion

of the Gyroscopic Exercise Tool 2095

Masahiko Aki, Yuki Takezaki, Kentaro Takagi and Tsuyoshi Inoue

Part XVIII Supporting Structure Effects

Development and Validation of a Model to Describe

the Bearings Interaction in Rotating Machines Due to Elastic

Supporting Structures 2111

Enrico Meli, Giovanni Pallini, Andrea Rindi and Stefano Rossin

Influence of the Supporting Structure Dynamic Behaviour

on the Shaft Vibration of a Real Rotating Machine 2123

Andrea Vania, Paolo Pennacchi and Steven Chatterton

Contents xxix

Development and Preliminary Validation of a New Strategyto Model the Interaction Between Rotating Machinesand Elastic Supporting Structure 2137E. Meli, G. Pallini, A. Rindi, S. Rossin, F. Capanni, D. Zaffino,V. Peselli and D. Calsolaro

Evaluation of Pedestal Stiffness Variations in Steel SupportedStructures for Steam Turbines 2149

Raj Subbiah

Modeling and Experimental Characterization of ResilientSupports for Turbomolecular Pumps 2165Carmelo Quartarone, Flavio Cometti, Sara Drovandi, Nicola Amati,Angelo Bonfitto, Lester D. Suarez and Andrea Tonoli

Experimental Evaluation of a Modal Parameter BasedFoundation Identification Procedure 2177Minli Yu, Ningsheng Feng and Eric J. Hahn

Modeling of Visco-elastic Supports for Hydropower Applications 2189Erik Synnegard, Rolf Gustavsson and Jan-OIov Aidanpaa

Theoretical Modeling for a Rotor-Bearing-Foundation Systemand Its Dynamic Characteristics Analysis 2199Jie Hong, Konstantin Shaposhnikov, Dayi Zhang and Yanhong Ma

Non-linear Behavior and Loading Capability of the SpringSupport in Lateral Response 2215Marcin Bielecki

Part XIX Thermal Effects

Thermal Unbalance Behaviour of Turbogenerator Rotors 2231Bartolomeus Irwanto, Lothar Eckert and Thorsten Prothmann

New Mathematical Model for the Morton Effect Based

on the THD Analysis 2243B.S. Grigor'ev, A.E. Fedorov and J. Schmied

Similarity Analysis of Spiral Vibration Behavioron Large Turbomachinery Shaft Lines 2255Kris Matthys and Joachim Schmied

xxx Contents

A New Approach for Thermo-Elastic Equationsto Predict Spiral Vibrations in Turbogenerator Shafts 2267Mateusz Golebiowski, Rainer Nordmann and Eric Knopf

Thermoelastic Steam Turbine Rotor Control Based

on Neural Network 2283

Krzysztof Dominiczak, Romuald Rzadkowski and Wojciech Radulski