ROTATING MACHINERY Dynamics Proceedings of the Third International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC-3)

Edited by

J. H. Kim Electric Power Research Institute Palo Alto, California

W.-J. Yang University of Michigan Ann Arbor, Michigan

OHEMISPHERE PUBLISHING CORPORATION A member of the Taylor & Francis Group

Washington Philadelphia London

Contents

Preface xi

ISROMAC-3 Committees xiii

ROTORS, DISCS, A N D SHAFTS

Rotordynamic Software S. H. Crandall 3

Flexural Vibrations of Rotors Immersed in Dense Fluids: Part I—Theory F. Axisa and J. Antunes 23

Flexural Vibrations of Rotors Immersed in Dense Fluids: Part II —Experiments

J. Antunes, F. Axisa, and F. Hareux 39

Blade Loss Dynamics of a Magnetically Supported Rotor F. Viggiano and G. Schweitzer 53

Nonlinear Mechanism of Bistable Response of a Flexible Rotor Supported in Squeeze Film Dampers

G. Meng 69

The Influence of the Rotational Speed on the Transverse Vibrations of Rotating Discs

W. Seemann 79

Effects of Changing Structure Factors on Torsional Performance of Shaft Systems

J. H. Yang and Q. J. Meng 95

Laboratory and Theoretical Investigations of the Vibrational Behaviour of a Uniform Rotor wi th a Transverse Crack

B. Schmalhorst 105

Whirl of Turborotors at High Loads A. D. Dimarogonas 121

v

SEALS

Dynamic Characteristics of Noncontacting Seal and Evaluation of Its Effect on Stability of Rotor System

T. Iwatsubo 139

Flow Visualization in a Single Simulated Brush Seal M. J. Braun, R. C. Hendricks, V. A. Canacci, and M. Kazmierchak 161

Rotordynamic Coefficients for Stepped Annular Gas Seals C. C. Nelson, M. S. Dünn, and J. K. Scharrer 177

A Three Volume Bulk Flow Model for the Calculation of Rotordynamic Coefficients of Look-Through Labyrinths

R. Nordmann and P. Weiser 191

Rotordynamic Coefficients for Turbulent Annular Misaligned Seals F. Simon and J. Frene 207

BEARINGS

An Analytical Investigation of a Cryogenic Journal Bearing M. J. Braun and F. K. Choy 225

Determination of Bearing Dynamic Coefficients from Unbalance Response in Flexible Rotor-Bearing Systems

S.-W. Hong and C.-W. Lee 239

Electromagnetic Bearings, a Reasonable Element in Turbomachinery? R. Siegwart and R. Truninger 253

An Improvement on the Estimation of the Linear Dynamic Coefficients of Oil-Film Journal Bearing Considering Nonlinear Effect by Parameter Identification in the Frequency-Domain

R. H. Zhu, C. S. Chang, and X. K. Tang 269

Dynamic Characteristics of an Overhung P/A Fan in Rolling Element and Fluid Film Bearings

E. J. Gunter, A. Hobbs, and C. Phelps 279

Component Test Results from the Bearing Life Improvement Program for the Space Shuttle Main Engine Oxidizer Turbopumps

J. E. Keba 303

A Theoretical Calculation of the Pressure and Flow Field of Fluid Film Bearing Under Eccentric Large Whirl Orbit

C.-S. Chang and H.-F. Cheng 319

vi

DIAGNOSTICS A N D MEASUREMENTS

Analysis of the Dynamic Behavior of Rotating Machines by Direct Measurement of Air Gap Variations

R Talas and R O. Toom 331

Vibration Protection of Aeration Turbine Gear Motor S. Gajin, S. Kuzmanovic, and G. Varju 349

STABILITY

A Simple Procedure for Assessing Rotor Stability K. E. Atkins, R. X. Perez, and D. M. Turner 361

A Method to Locate the Source of a Rotor Fluid-Induced Instability Along the Rotor

D. E. Bent/y and R. F. Bosmans 377

Stability Behaviour of a Three Journal Bearing Rotor System Excited by a Lateral Force

K. Kwanka 387

The Role of Flow-Related Tangential Forces in Rotor/Bearing/Seal System Stability

A. Muszynska 401

Nonlinear Interactions Between Resonance and Instability in a Symmetrie Rotor

S. W. Shaw and J. Shaw 419

Stability of Rotating Cylindrical Shells Including Nonlinear Stiffening P Rüge and Th. Plonski 435

EFFECTS OF FLOW- INDUCED FORCES

Aeroelastic Analysis of Vertical Axis Wind Turbines A. F. A. A. El-Sayed 447

Stochastic Aerodynamic Model for Studying Darrieus Rotor in Turbulent Wind

M. T. Brahimi and I. Paraschivoiu 463

Analytical and Experimental Study of the Hydrodynamic Unbalance of Single-Vane Impellers

H. E. Siekmann and M. Stark 479

VII

Off-Design Behavior of Two Pump-Turbine Model Impellers wi th Similar Geometry but Different Blade Curvature

H. Stepanik and H. Brekke 497

An Experimental Study of Fluid Forces on a Centrifugal Impeller Rotating and Whirling in a Volute Casing

Y. Yoshida and Y. Tsujimoto 513

Periodic Radial Forces Acting on Screw Centrifugal Pump K. Tanaka, M. Arai, and S. Ikeo 527

CONTROL A N D DESIGN

Active Chamber System for Vibration Control of Rotating Machinery J. Althaus and H. U/brich 543

A Magnetic Bearing Control Scheme for Cancelling Submerged Rotor Vibratory Forces

H. M. Chen and P. Lewis 559

Optimal Location of Forces Controlling Vibration of Flexible Rotors Z Gosiewski and T. Bil 571

An Adaptive Control Method of Flexible Rotor Vibration Z Gosiewski and D. Janecki 587

The Use of Piezoelectric Actuators for Active Vibration Suppression in Rotating Machinery

A. F. Kascak, A. B. Palazzolo, R. R. Lin, and G. Montague 605

Development of Sealing Line Calculation in Twin Screw Compressor L Zhang and J. F. Hamilton 623

Computer System for Multi-Bearing Rotor Design Z A. Parszewski and K. Krynicki 639

GENERAL TOPICS

Electrostatic Charge Build-up in Lubricating Channels of Turbomachinery J. Seyed-Yagoobi, R. D. Gross, andA. B. Palazzolo 653

Free Vibration Analysis of a Rotating Workpiece During Machining R. P. S. Han and J. W. Z Zu 661

Equations of Motion of a Flexible Rotor wi th Axially Loose Disc M. Riemer 675

viii

The Use of Beam-Like Model Data for Stiffness Profile Estimation by the EBS Method: Part 2—Completion and Benchmarking

T. A. Vest and M. S. Darlow 693

Simulation Research on the Dynamic Characteristics of a Steam-Injected Gas Turbine

K.-J. Mao andX.-W. Dai 705

Application of SVD Algorithm to Influence Coefficient Balancing Computation of Flexible Rotors

J. M. Yang 719

On the Asymmetrie Vibration of Point-Supported Circular Plates S. Azimi 729

Author Index 735

Subject Index 737

IX