Mechanisms and Machine Science

Volume 21

Series editor

Marco Ceccarelli, Cassino, Italy

More information about this series at http://www.springer.com/series/8779

Paolo PennacchiEditor

Proceedings of the 9thIFToMM InternationalConference on RotorDynamics

123

EditorPaolo PennacchiDepartment of Mechanical EngineeringPolitecnico di MilanoMilanItaly

ISSN 2211-0984 ISSN 2211-0992 (electronic)Mechanisms and Machine ScienceISBN 978-3-319-06589-2 ISBN 978-3-319-06590-8 (eBook)DOI 10.1007/978-3-319-06590-8

Library of Congress Control Number: 2015936366

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Preface

The International Federation for the Promotion of Mechanism and Machine Science(IFToMM) aims at promoting research and development in the field of machinesand mechanisms by theoretical and experimental methods, along with their practicalapplication.

IFToMM’s vision evolved since its foundation in 1969: at the time, it consistedof initiating and facilitating international collaboration between Eastern andWestern countries. Today, it has evolved in assisting and enhancing internationalcollaboration and in disseminating modern results on mechanism and machinescience. Tomorrow, IFToMM will provide leadership for cooperation and devel-opment in mechanism and machine science.

IFToMM has 12 technical committees, among which that on rotordynamics isone of the most active. Since 1982, every 4 years, the rotordynamics technicalcommittee has been organizing a world conference, which over the years hasbecome an irreplaceable point of reference for the academic world and industry.The first eight editions were held in Rome, Tokyo, Lyon, Chicago, Darmstadt,Sydney, Vienna, and Seoul.

After 32 years, for the ninth edition, the IFToMM International Conference onRotor Dynamics is returning to Italy, the country where it made its debut. Since thatfirst meeting in Rome, much has changed in the rotor dynamics field. Great pro-gress has been made in modeling rotor machines: the results we can achieve todayfrom calculation models are very close to those obtained through experimentalpractice. Rotordynamics is more and more connected with our day-to-day living,with the new needs and challenges characterizing modern living: from energyproduction to the transportation sector and industry, to the reliability of the tech-nological devices we use everyday. Due to the importance of the application ofrotordynamics in industry, and in order to promote the comparison and discussionof ideas, needs, and experiences coming from industry and the academic world, theconference proceedings introduced in this book will feature the presence of twoorganizing committees: a scientific committee and an industrial committee.

The papers collected in these proceedings cover a wide range of topics, that is:balancing, blade dynamics, case histories, cracks in rotating shafts, diagnostics,

v

electromechanical interaction, fault identification, gas foil bearings, gearedmachines, magnetic bearings, modeling and control, rolling element bearings, rub—rotor to stator contact, seals, stability, supporting structure effects, and thermaleffects.

A grand total of 198 papers have been selected after peer reviewing and 187 areincluded in these proceedings. Actually, this figure represents a record with respectto previous editions of the conference and it is a further confirmation of the up-to-dateness and vivacity of rotordynamics. Moreover, these proceedings represent notonly the state of the art but also a foresight on the various topics of rotordynamics,which allows forecasting technical future developments in this technical field.

As the chairman of the conference, I am proud of the results obtained and Iwould like to share them with the friends and colleagues of Politecnico di Milano,who helped me (Steven Chatterton, Andrea Vania, Nicolò Bachschmid, and PhoucVinh Dang). Last but not least, I gratefully acknowledge the sponsors of the con-ference (SKF, Danieli, Eurobearings, IfTA, Boldrocchi, Turboden and Siemens)and those who cooperated with us (IFToMM, MUSP, GE—Measurement andControl, EDF, National Instruments and Fondazione Politecnico di Milano).

Paolo Pennacchi

vi Preface

Committee

Scientific Committee

Jan-Olov Aidanpää, Luleå University of Technology (SWE)Nicolò Bachschmid, Politecnico di Milano (ITA)Alberto Berizzi, Politecnico di Milano (ITA)Miha Boltežar, Univerza v Ljubljani (SVN)Sanjin Braut, Sveučilište u Rijeci Tehnički Fakultet (HRV)Izhak Bucher, Technion-Israel Institute of Technology (ISR)Katia Cavalca Lucchesi, UNICAMP—Universidade Estadual de Campinas (BRA)Merab Chelidze, Georgian Technical University (GEO)Mnaouar Chouchane, Ecole Nationale d’Ingénieurs de Monastir (TUN)Fulei Chu, Tsinghua University (CHN)Giorgio Dalpiaz, Università degli Studi di Ferrara (ITA)Sergio E. Diaz, Universidad Simón Bolívar (VEN)Régis Dufour, INSA de Lyon (FRA)Horst Ecker, Technische Universität Wien (AUT)Eduard Egusquiza, UPC—Universitat Politècnica de Catalunya (ESP)Aly El-Shafei, Cairo University (EGY)David J. Ewins, University of Bristol (GBR)Alfonso Fernández del Rincón, Universidad de Cantabria (ESP)Ilmar Ferreira Santos, DTU—Danmarks Tekniske Universitet (DNK)Laszlo Forrai, Miskolci Egyetem (HUN)Paola Forte, Università degli Studi di Pisa (ITA)Hiroyuki Fujiwara, National Defence Academy (JPN)Paolo Gaetani, Politecnico di Milano (ITA)Seamus Garvey, University of Nottingham (GBR)Alain Gelin, Total S.A. (FRA)Giancarlo Genta, Politecnico di Torino (ITA)Julio Cesar Gómez Mancilla, SEPI-ESIME-IPN (MEX)K. Gupta, Indian Institute of Technology (IND)

vii

Eric Hahn, The University of New South Wales (AUS)Timo P. Holopainen, ABB Ltd (FIN)Tsuyoshi Inoue, Nagoya University (JPN)Ashok Kaushal, Rolls-Royce Canada (CDN)Jan Kiciński, Politechnika Gdańska (POL)Chang-Ho Kim, KIST-Europe (KOR)R. Gordon Kirk, Virginia Tech (USA)Chong-Won Lee, KAIST (KOR)Chee W. Lim, City University of Hong Kong (HKG)Eduard Malenovsky, Vysoké Učení Technické v Brně (CZE)Richard Markert, Technische Universität Darmstadt (DEU)Jeffrey J. Moore, Southwest Research Institute (USA)Claus Myllerup, Lloyd’s Register OD (DKN)C. Nataraj, Villanova University (USA)Rainer Nordmann, Fraunhofer Institute for Structural Durabilityand System Reliability LBF (DEU)Christos A. Papadopoulos, University of Patras (GRC)Paolo Pennacchi, Politecnico di Milano (ITA)Eduardo Preciado Delgado, Instituto de Investigaciones Eléctricas (MEX)Robert B. Randall, The University of New South Wales (AUS)J.S. Rao, Kumaraguru College of Technology (IND)Riccardo Rubini, Università degli Studi di Modena e Reggio Emilia (ITA)Romuald Rzadkowsky, Politechnika Gdańska (POL)Luis San Andrés, Texas A&M University (USA)Jerzy T. Sawicki, Cleveland State University (USA)T.N. Shiau, Bao Chief Green Ecoenergy Technology Co., Ltd (TWN)Jyoti K. Sinha, The University of Manchester (GBR)Andrea Vania, Politecnico di Milano (ITA)Iurii Vorobiov, A.N. Podgorny Institute for Mechanical Engineering Problems (UKR)Hans I. Weber, PUC—Pontifícia Universidade Católica do Rio de Janeiro (BRA)Bangchun Wen, Northeastern University (CHN)Hakan L. Wettergren, Wolfram MathCore AB (SWE)Maurice F. White, Norges Teknisk-Naturvitenskapelige Universitet (NOR)Jaroslav Zapomel, Vysoká škola báňská—Technická univerzita Ostrava (CZE)Wen Zhang, Fudan University (CHN)

Industrial Committee

Karl-Helmut Becker, MTU Aero EnginesPiero Bodini, ABBAthanasios Chasalevris, BorgWarner Inc.Andrea De Luca, Danieli & C. Officine Meccaniche SpAFadi Dohnal, Alstom

viii Committee

Lothar Eckert, AlstomFlorian Hiss, SiemensBartolomeus Irwanto, AlstomEric Knopf, AlstomThomas Krüger, AlstomPaolo Lombardi, Eurobearings SrlEdmund A. Memmott, Dresser-Rand Group Inc.Lorenzo Naldi, General ElectricIonel Nistor, EDF—Electricité de FranceEmanuel Giuseppe Pesatori, Franco Tosi Meccanica SpAThorsten Prothmann, AlstomNicolas Peton, General ElectricPaolo Saccenti, Boldrocchi SrlJoachim Schmied, DELTA JS AGKurt Steigleder, AlstomGiuseppe Vannini, General ElectricRobin Williams, Rolls-Royce Group PLCVittorio Zanella, SKF

Committee ix

Contents

Part I Balancing

Vibration Sensitivity of Large Turbine Generator Shaft Trainsto Unbalance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Shuiping 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39Zlatan 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 . . . . . 65Nicolò Bachschmid, Emanuel Pesatori, Simone Bistolfiand Steven Chatterton

xi

Influence of the Blades Configuration on the Dynamicsof a 3-Bladed Jeffcott Rotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79Florian Thiery and Jan-Olov Aidanpää

Forced Vibration of Eight Mistuned Bladed Discs on a SolidShaft—Excitation of the Second Compressor Bladed Disc . . . . . . . . . . 89Romuald Rzadkowski, Artur Maurin and Ryszard Szczepanik

Vibration Response Analysis of Mistuned Bladed Disk Consistingof Directionally Solidified Blade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101Yasutomo Kaneko, Kazushi Mori and Hiroharu Ooyama

The Influence of Blade Row Dynamics on Lateral and TorsionalShaft Vibrations in Steam Turbines . . . . . . . . . . . . . . . . . . . . . . . . . . 113N. Bachschmid, G. Salvini, E. Tanzi and E. Pesatori

Explanation of the Snubbing Mechanism on Vibration Reductionby Means of Chaos Metrics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129Steven Chatterton, Paolo Pennacchi and Andrea Vania

Efficient Modelling of Rotor-Blade Interaction UsingSubstructuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143Fadi Dohnal, Eric Knopf and Rainer Nordmann

Modeling Impulse Periodic Excitation of Blade Rows in SteamTurbines in Partial Arc Admission Conditions . . . . . . . . . . . . . . . . . . 155N. Bachschmid, E. Tanzi, E. Pesatori and S. Bistolfi

An Improved Microslip Model for Variable Normal Loads . . . . . . . . . 169Chiara Gastaldi and Muzio M. Gola

Nonlinear Behavior Analysis Caused by Blade Tip Rubbingin a Rotor-Disk-Blade System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181Hui 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195Bruno Cayres, Cesar da Fonseca, Adriano Santos and Hans I. Weber

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

xii Contents

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

Keyphasor® Based Torsional Vibration Detection and FieldApplications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233Huageng 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 SpeedCoupling Spacer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267R.G. Kirk, K.A. Schoeneck and E.A. Memmott

Analysis of Super-Synchronous, Sub-mesh Frequency Vibrationsin a Speed Increaser Gearbox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281C. Hunter Cloud, James M. Byrne, Minhui He, José A. Vázquezand Timothy J. Hattenbach

Optimization of Low Frequency Balancing of GD-40 Rotor . . . . . . . . . 297Vladimir Shahrinov and Oleg Sliva

Analysis and Experimental Test of a 200 kW Oil-Free MicroGas Turbine Simulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 307Bonjin Koo, Chang-Ho Kim, Jong Sung Lee, Tae Ho Kimand Kyuho Sim

Part IV Cracks in Rotating Shafts

FEM Analysis of the SIF in Rotating Shafts Containing BreathingElliptical Cracks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323Patricia Rubio, Belén Muñoz-Abella and Lourdes Rubio

Damping in a Parametrically Excited Cracked Rotor . . . . . . . . . . . . . 335Jerzy T. Sawicki and Zbigniew Kulesza

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

Contents xiii

Experimental Identification of Rotor Crack Forces . . . . . . . . . . . . . . . 361C. Shravankumar, R. Tiwari and A. Mahibalan

Experimental Analysis and Validation of a Vibration-BasedTechnique for Crack Detection in a Shaft . . . . . . . . . . . . . . . . . . . . . . 373María J. Gómez, Cristina Castejón, Juan C. García-Pradaand Jesús López

Part V Diagnostics

Fault Diagnosis and State Detection in Centrifugal Pumps—A Reviewof Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387P. Beckerle, H. Schaede and S. Rinderknecht

Tracking the Damage Level in Rolling Element Bearings . . . . . . . . . . 399Steven Chatterton, Paolo Pennacchi, Andrea Vaniaand Pietro Borghesani

Order Tracking Under Run-Up and Run-Down Conditions . . . . . . . . . 409Michael D. Coats and Robert B. Randall

A Novel Procedure for the Selection of the Frequency Bandin the Envelope Analysis for Rolling Element Bearing Diagnostics . . . . 421Steven Chatterton, Paolo Pennacchi, Andrea Vania and Pietro Borghesani

Modelling Roller Bearing Dynamics Inducing InstantaneousAngular Speed Variations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 431Jose L. Gomez, Adeline Bourdon, Hugo André and Didier Rémond

Non-linear Elasto-dynamic Model of Faulty RollingElements Bearing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 443Michele Cotogno, Enrico Pedrazzi, Marco Cocconcelliand Riccardo Rubini

Architecture of the Monitoring System for the TractionSystem Bearings of a Regional Locomotive . . . . . . . . . . . . . . . . . . . . . 455Steven Chatterton, Paolo Pennacchi, Andrea Vaniaand Pietro Borghesani

Monitoring the Dynamic Behavior in Polar Domain for an EasierDiagnostic of Rotating Machinery . . . . . . . . . . . . . . . . . . . . . . . . . . . 465Jarir Mahfoud and Benjamin Defoy

xiv Contents

Signal Processing Techniques for the Identification of Wheels’Imbalance in Presence of Disturbances . . . . . . . . . . . . . . . . . . . . . . . . 475Marco Tarabini, Andrea Gironacci, Roberto Panzeriand Diego Scaccabarozzi

Use of Chaos in the Diagnostics of Rolling Element Bearings. . . . . . . . 485Steven Chatterton, Paolo Pennacchi, Andrea Vaniaand Pietro Borghesani

Model Based Automated Diagnosis of Bearing Knock Faultsin Internal Combustion Engines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 497Jian 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 . . . . . . . 543Eoin Peter Carden and Stefano Morosi

Multi Fault Diagnosis of the Centrifugal Pump Usingthe Wavelet Transform and Principal Component Analysis . . . . . . . . . 555Berli Kamiel, Kris McKee, Rodney Entwistle, Ilyas Mazharand 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

Contents xv

Part VI Electromechanical Interaction

Rotor Vibrations in Electrical Machines Due to ElectromagneticForces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 601Mathias Mair, Bernhard Weilharter and Katrin Ellermann

Experimental Investigation of Structural Damping of LaminatedStacks of Electrical Machine Rotors . . . . . . . . . . . . . . . . . . . . . . . . . . 613Marcel Clappier and Lothar Gaul

Investigating Grid-Induced Turbo-Generator Vibrations:A Multidisciplinary Challenge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 625Frits Petit, Koen De Bauw, Kris Matthys and Sylvain Doucement

Rotor Vibration Difference Among the Single and the CombinedFaults Composed by Static Air-Gap Eccentricity and RotorInterturn Short Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 637Yu-Ling He, Fa-Lin Wang, Meng-Qiang Ke and Gui-Ji Tang

Prediction of Ultimate Coupling Torque During TransientShort-Circuit Loads of Electric Motors . . . . . . . . . . . . . . . . . . . . . . . . 649Timo P. Holopainen

Rotordyamic Analysis of a 2-Pole Induction Motor ConsideringMagnetic Excitation Due to Dynamic Rotor EccentricityDuring Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 661Christian Bauer and Ulrich Werner

Part VII Fault Identification

Model-Based Fault Detection on a Non-linear Rotor System . . . . . . . . 679Ramakrishnan Ambur, Zhentao Wang, Rudolf Sebastian Schittenhelmand Stephan Rinderknecht

Experimental Unbalance Identification by Means of CorrelationAnalysis and Model Order Reduction . . . . . . . . . . . . . . . . . . . . . . . . . 689Fabio Dalmazzo Sanches and Robson Pederiva

Fault Detection in a Rotating Machine by Usingthe Electromechanical Impedance Method . . . . . . . . . . . . . . . . . . . . . 701Aldemir Ap Cavalini Jr, Roberto Mendes Finzi Netoand Valder Steffen Jr

xvi Contents

Application of Bayesian Inference to Unbalance Identificationin Rotors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 711Natalia Cezaro Tyminski and Helio Fiori de Castro

Application of Multiple-Model Estimation Method to RotorFault Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 723Lin Jia, Jianping Jing and Zhiqiang Wang

Application of a Model-Based Method for Balancing a LargeSteam Turbo-Generator Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 735Ionel 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 Rotorsat Operational Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 757Eric Knopf, Thomas Krüger and Rainer Nordmann

Model Validation for Damage Identification and Determinationof Local Damage Dynamics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 769Ryan J. Madden, Alexander H. Pesch and Jerzy T. Sawicki

Experimental Estimation of Misalignment Effectsin Rotor-Bearing-Coupling Systems . . . . . . . . . . . . . . . . . . . . . . . . . . 779Mohit Lal and Rajiv Tiwari

Part VIII Fluid Film Bearings

Development and Preliminary Validation of Efficient 3D Modelsof 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 JournalBearing Dynamics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 805Minhui He, C. Hunter Cloud and José A. Vázquez

Multilobe Floating Ring Bearings for Automotive Turbochargers . . . . 821Rob Eling, Ron van Ostayen and Daniel Rixen

Contents xvii

Influence of Bearing Geometry of Automotive Turbochargerson the Nonlinear Vibrations During Run-Up. . . . . . . . . . . . . . . . . . . . 835Elmar Woschke, Stefan Göbel, Steffen Nitzschke, Christian Danieland Jens Strackeljan

Nonlinear Oscillations of High-Speed Rotor Systemsin Semi-Floating Ring Bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 845Aydin Boyaci and Bernhard Schweizer

Dynamic Forced Performance of Short Length Open-Ends SqueezeFilm Damper with End Grooves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 855Luis San Andrés, Sung-Hwa Jeung and Gary Bradley

The Identification Method for Dynamic Characteristics Coefficientsof Rotor Sliding Bearing Based on System Lag Angle . . . . . . . . . . . . . 867Guangfu Bin, Longkai Wang, Kun Feng and Xuejun Li

Effect of Square-Dimple Size on Dynamic Characteristicsof Textured Journal Bearings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 883Hiroyuki Yamada, Satoru Kaneko and Hiroo Taura

Geometric Discontinuities Identification in HydrodynamicBearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 895Tiago H. Machado and Katia L. Cavalca

Measurement of Drag Torque, Lift off Speed and RotordynamicForce Coefficients in a Shimmed BFB . . . . . . . . . . . . . . . . . . . . . . . . 909Luis San Andrés and Joshua Norsworthy

A Test Rig for Evaluating Tilting-Pad Journal BearingCharacteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 921Steven Chatterton, Paolo Pennacchi, Phuoc Vinh Dangand Andrea Vania

Identification Dynamic Force Coefficients of a Five-PadTilting-Pad Journal Bearing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 931Steven Chatterton, Paolo Pennacchi, Phuoc Vinh Dangand Andrea Vania

Construction and Experimental Application of a VariableGeometry Journal Bearing (VGJB) for the VibrationSuppression of Rotors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 943Athanasios Chasalevris and Fadi Dohnal

xviii Contents

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. Zapoměl 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 . . . . . 1045Gregory 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 . . . . . . . . . . . . . . . . . . . . . . . . 1069Thomas Hagemann and Hubert Schwarze

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

Contents xix

Analysis of the Influence of Fluid Temperature Variationon the Behavior of Turbocharger Lubricated Thrust Bearings. . . . . . . 1091Leonardo C. Vieira, Paula N. Watanabe and Katia L. Cavalca

Dynamics Analysis of Flexible Rotor Supported by FloatingRing Bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1103Pavel Taranenko, Oleg Sliva and Elena Zadorozhnaya

Control of Rotor Motion Using Active Fluid-Film Bearings . . . . . . . . . 1115Leonid Savin and Denis Shutin

Thermal Effects in Hydrodynamic Cylindrical Bearings . . . . . . . . . . . 1123Diogo Stuani Alves, Gregory Bregion Danieland Katia Lucchesi Cavalca

Temperature Influence on the Behavior of a MagnetorheologicalFluid Journal Bearing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1135Dimitrios A. Bompos and Pantelis G. Nikolakopoulos

Test Rig Characterization and Dynamic Testing of a SmartElectro-Magnetic Actuator Journal Integrated Bearing . . . . . . . . . . . . 1145A. 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 RandomFluid-Induced Forces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1157Zigang Li and Jun Jiang

Part IX Gas Foil Bearings

On the Dynamics of a Rigid Rotor with Static UnbalanceSymmetrically Mounted in Compliant Air Bearings . . . . . . . . . . . . . . 1169Christoph Baum, Hartmut Hetzler and Wolfgang Seemann

Thermal Studies on Foil Bearings with a Sliding CoatingMade of Plastic Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1183Jan Kicinski, Grzegorz Zywica and Pawel Baginski

Parametric Study of Dynamic Analysis Focusing on the FoilStructure of a Gas Foil Journal Bearing . . . . . . . . . . . . . . . . . . . . . . . 1195Bok Seong Choe, Se Na Jeong, Eo Jin Kim and Yong-Bok Lee

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Static and Dynamic Analyses of a Rotor with AerostaticCeramic Porous Journal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1207Luis Renato Chiarelli and Zilda de Castro Silveira

Fluid Flow and Thermal Features of Gas Foil ThrustBearings 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 . . . . . . . . . . . 1247Joury Temis, Mikhail Temis, Andrey Egorov and Valentin Gavrilov

Non-linear Stability Analysis of a Modified Gas Foil BearingStructure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1259Robert 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. Matushkinand D.P. Kholobtsev

Externally Pressurized Gas Journal Bearings with AsymmetricGas Supply (Verification of Availability of Gas Pressure ControlUsing 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1303Omar D. Mohammed, Matti Rantatalo and Jan-Olov Aidanpää

Study on Nonlinear Meshing Stiffness of Spline . . . . . . . . . . . . . . . . . 1315Guang Zhao, Juncong Su, Jingyu Zhai, Qingkai Han and Yanyan Shi

Contents xxi

Research on Dynamic Modeling and Analysis of the CoupledPlanetary Gear and Rotor System . . . . . . . . . . . . . . . . . . . . . . . . . . . 1323Hong-Liang Yao, Yang Liu, Zhao-Hui Ren, Bang-Chun Wenand Chao-Feng Li

Effect of Gear Tooth Breakage on the Dynamic Responsein a Wind Turbine Drive Train Subjected to StochasticLoad Excitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1333P. Srikanth and A.S. Sekhar

On the Diagnostics of Planet Gear Bearings . . . . . . . . . . . . . . . . . . . . 1345Gianluca D’Elia, Marco Cocconcelli, Emiliano Mucchiand Giorgio Dalpiaz

Dynamic Characterization of Wind Turbine Gearboxesin Operational Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1357E. Di Lorenzo, S. Manzato, F. Vanhollebeke, S. Goris, B. Peeters,W. Desmet and F. Marulo

The Torsional Stiffness of Involute Spur Planetary Gears . . . . . . . . . . 1369Song Xue, Rodney Entwistle, Ilyas Mazhar and Ian Howard

Planet Eccentricity Error on a Planetary Gear Transmission:Influence on Load Sharing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1381M. Iglesias, A. Fernández, A. de Juan, A. Díez, P. García and F. Viadero

Rotordynamic Analysis for Integrally Geared Air CompressorUsing Measured Dynamic Coefficients of Tilting PadJournal Bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1391Wonhyun Kim, Taeyoung Kim, Dohyeong Lim, Sangpyo Wooand Wonho Joo

Part XI Magnetic Bearings

Rotor Active Vibration Control via Internal Magnetic Bearingsand a Concentric Inner Shaft Coupling . . . . . . . . . . . . . . . . . . . . . . . 1407Chris Lusty, Necip Sahinkaya and Patrick Keogh

Vibration Control of Rotor Shaft Systems Using ElectromagneticActuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1415Shivang Shekhar, Nitish Sharma, Hemanta Kumar Roy,Anindya Sundar Das and Jayanta Kumar Dutt

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Experimental Estimation of Speed-Dependent Active MagneticBearing Rotordynamic Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . 1431Rajiv 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 ControllableHybrid 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 Forcesin 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 Kärkkäinen, Jussi Sopanen and Aki Mikkola

Part XII Miscellanea

Internal Sensing and Actuation Strategies for Smart MachineRotors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1527Samuel Jiménez, Patrick Keogh and Matthew Cole

Assessment of Numerical Model to Determination of Parametersto Stability Experimental Tests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1539Felipe W.S. Tuckmantel, Gregory B. Daniel, Hélio F. Castroand Katia L. Cavalca

Contents xxiii

Experimental Observations of Rotor Orbit Analysisin Rotating Machines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1551Akilu Yunusa-Kaltungo, Adrian D. Nembhard and Jyoti K. Sinha

Experimental Study on the Dynamic Characteristics of SplineJoint in Rotor System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1561Yanhong Ma, Wang Cun, Dayi Zhang and Jie Hong

Part XIII Modelling and Control

Capturing the Dynamics of Rotating Machines: A ModernGlobal Approach Based on SAMCEF Rotor . . . . . . . . . . . . . . . . . . . . 1573P. Morelle

An Innovative Rotordynamical Model for CoupledFlexural-Torsional Vibrations in Rotating Machines . . . . . . . . . . . . . . 1581Filippo Cangioli, Alice Innocenti, Lorenzo Marini, Enrico Meli,Luca Pugi and Andrea Rindi

Vibration Control in Electrical Machines Using Built-in Actuator . . . . 1593Karuna Kalita, Sivaramakrishnan Natesan, Gaurav Kumarand Kari Tammi

Inclusion of Unsteady Bow in a Model-Based Monitoring Systemfor Rotors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1605Markus Rossner, Thomas Thuemmel and Heinz Ulbrich

Development and Validation of Efficient Rotordynamical Modelsfor Complex Rotating Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1617Filippo Cangioli, Alice Innocenti, Lorenzo Marini, Enrico Meli,Luca Pugi and Andrea Rindi

Non-linear Analysis of the Defects of a Vertical Turbine . . . . . . . . . . . 1629Sébastien Denis, Mohamed-Amine Hassini and Mihaï Arghir

A Method for Assessing the Turbine Generator Set Shaft-LineBehavior in Accidental Situations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1641Nicolas Guilloteau, Ionel Nistor, Nabila Sellali-Haraigue,Pierre-Yves Couzon and Pierre Verrier

Effect of Unbalanced Rotor on the Dynamics of CylindricalRoller Bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1653Aditya Sharma, M. Amarnath and P.K. Kankar

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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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1677Balram 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 UsingH‘-Optimal Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1727Fabian B. Becker, Stefan Heindel and Stephan Rinderknecht

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

Controllers for Attenuation of Lateral Rotor VibrationPart I: Controller Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1753Rudolf Sebastian Schittenhelm and Stephan Rinderknecht

Controllers for Attenuation of Lateral Rotor VibrationPart II: Controller Optimization and Comparison. . . . . . . . . . . . . . . . 1763Rudolf Sebastian Schittenhelm and Stephan Rinderknecht

Controlled Modal Energy Transfer in Torsional SystemsUsing Impulsive Parametric Excitation . . . . . . . . . . . . . . . . . . . . . . . . 1775Thomas Pumhössel, Horst Ecker, Peter Hehenberger and Klaus Zeman

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

Contents xxv

Prediction of Rotor Dynamic Behavior of Synchronous Generators . . . 1797J.S. Rao, Vijendra Gupta, Prachi Khullar and D. Srinivas

Towards Determination of Critical Speeds of a Rotating Shaftwith Eccentric Sleeves: Equations of Motion . . . . . . . . . . . . . . . . . . . . 1809Antony Kirk, Fotios Georgiades and Chris Bingham

Studying Continuum Dynamic Behaviour Through RigidMultibody Dynamics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1823Vikas Kumar Kharolia, J.K. Dutt, S.K. Saha and S.V. Shah

Nonlinear Dynamic Analysis of Ball Bearings Due to VaryingNumber of Balls and Centrifugal Force . . . . . . . . . . . . . . . . . . . . . . . 1831V. Vakharia, V.K. Gupta and P.K. Kankar

Sensitivity Analysis on the Dynamic Characteristicsof a 1000 MW Turbo-Generator Rotor. . . . . . . . . . . . . . . . . . . . . . . . 1841Van Thanh Ngo, Danmei Xie, Yi Yang, Shang Gao and Jie Guo

Prediction Capabilities of Coriolis and Gyroscopic Effectsin Current Finite Element Software . . . . . . . . . . . . . . . . . . . . . . . . . . 1853Valentina Ruffini, Christoph W. Schwingshackl and Jeffrey S. Green

A Parameter Preserving Model Order Reduction Algorithmfor Rotordynamic Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1863Kristin Krenek

Finite Element Modeling and Vibration Analysis of a FreePower Turbine Subjected to Non-synchronous Excitation . . . . . . . . . . 1875A.O. Pugachev, A.V. Sheremetyev, V.V. Tykhomirovand O.I. Shpilenko

Part XIV Rolling Element Bearings

Rotor-Dynamic Computer Simulations of Rolling Bearingin High-Speed Rotating Machinery. . . . . . . . . . . . . . . . . . . . . . . . . . . 1889Giacomo Landi, Travis Shive and Fabrizio Mandrile

Spherical Roller Bearing Simulation Modelwith Localized Defects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1899Behnam Ghalamchi, Jussi Sopanen and Aki Mikkola

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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 Characteristicsfor Cage Instability of Cryogenic Deep Groove Ball Bearings . . . . . . . 1921SolJi 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1935Oliver Alber

Rotor-Stator Partial Rub Diagnosis Using Hilbert HuangTransform. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1945Sanjin Braut, Roberto Žigulić, Goranka Štimac 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,Céline Bordegaray, Frédéric Battle and Régis 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 Wernerand Tobias Wiedemann

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

Contents xxvii

Effects of Clearance on Leakage Flow Characteristicsof Labyrinth Brush Seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2019Yuan Wei, Zhaobo Chen, Yinghou Jiao, Xin Du and Zhouqiang Zhang

Dynamic Analysis of a Non-contacting Finger Seal . . . . . . . . . . . . . . . 2031Joury Temis, Alexey Selivanov and Ivan Dzeva

Part XVII Stability

On the Stabilizing Effect of Support Asymmetryin Rotordynamics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2045Giancarlo Genta

Periodic Stability and Sensitivity Analysis of Rotating Machinery . . . . 2059Aykut Tamer and Pierangelo Masarati

Numerical Analysis on the Nonlinear Hysteresis PhenomenonAssociated with Instability of a Steam TurbineRotor-Bearing System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2071Ying Cui, Yongliang Wang and Jingjun Zhong

Stability Analysis and Assessment of Rotor TrainsUsing Operational Modal Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . 2083Eoin Peter Carden, Niklas Sehlstedt, Kenny Krogh Nielsen,Staffan Lundholm and Stefano Morosi

Stability Analysis Based on Energy Balance of Motionof the Gyroscopic Exercise Tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2095Masahiko Aki, Yuki Takezaki, Kentaro Takagi and Tsuyoshi Inoue

Part XVIII Supporting Structure Effects

Development and Validation of a Model to Describethe Bearings Interaction in Rotating Machines Due to ElasticSupporting Structures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2111Enrico Meli, Giovanni Pallini, Andrea Rindi and Stefano Rossin

Influence of the Supporting Structure Dynamic Behaviouron the Shaft Vibration of a Real Rotating Machine . . . . . . . . . . . . . . . 2123Andrea Vania, Paolo Pennacchi and Steven Chatterton

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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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2149Raj 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 Synnegård, Rolf Gustavsson and Jan-Olov Aidanpää

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 Basedon 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

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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 Basedon Neural Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2283Krzysztof Dominiczak, Romuald Rzadkowski and Wojciech Radulski

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