Effect of Supporting Structure on Rotor Dynamics
It is advantageous in many scientific as well as industrial situations to treat considered systems (mechanism, machine or its subassemblies as parts (subsystems) of a larger system. It may contain, besides the considered assembly, also other assemblies of
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DYNAMICS OF ROTORS STABILITY SYSTEM
AND
IDENTIFICATION
EDITED BY
n. MAHRENHOLTZ TECHNISCHE UNIVERSITAT HAMBURG . HARBUR(~
SPRINGER-VERLAG WIEN GMBH
This volume contains 286 illustrations.
This work is subject to copyright. AII righ ts are reserved, whether the whol!' or part of the material is conrl'rn!'d spl'rifically those of translation, reprinting, re·use of illustrations, broadcasting, reproduction by photocopying machine or similar means, and storage in data
bank~.
© 1984 by Springer-Verlag Wien Originally published by Springer-Verlag Wien New York in 1984
ISBN 978-3-211-81846-6 ISBN 978-3-7091-2812-1 (eBook) DOI 10.1007/978-3-7091-2812-1
PREFACE
The knowledge of the dynamic behaviour of turbo-machinery is of great importance in power production engineering and in adjacent fields. The safe and efficient operation of power plants calls for a proper understanding of the mechanical behaviour of turbine rotors. The development of computers and computer techniques and instrumentation and vibration monitoring has improved the tools for handling rotor vibrations and stability. It was the aim of the course DYNAMICS OF ROTORS, held at the International Centre for Mechanical Sciences (CISM), Udine, in October 1980 to present
mod~rn
trends and new scientific and engineering results. In
general, basic knowledge of lhe state-of-the-art in rotor dynamics was required from the audience and is hence required from the reader. It has laken some time lo get the leclure noles refined and printed. Although the editor has tried to coordinale the contributions,some overlapping was unavoidable since the authors presented their subjects independently. This, on the other hand, has the advantage to focus on some phenomena from different poinls of view. After an introduction to modal analysis in rotor dynamics lhe dynamic behaviour is widely trealed wilh parlicular respect lo the influence of journal bearings and to rotor instability. New calculation methods in balancing rotors are discussed and so are measuremenl and identification techniques. Special topics such as crack problems, blade vibrations and
Preface
torsional vibrations conclude the book. The lecturers and the editor hope that this book may serve as a source of information for engineers and scientists working in the field of rotor dynamics.
o.
Mahrenholtz
CONTENTS page Preface Part I - Modal Analysis in Rotor Dynamics . . . . . . . 1.1 Modal Analysis in Rotor Dynamics (R. Sordmann) Part II - Dynamic Behaviour of Rotors ... . . . . . . . 2.1 Theory of Bearing Static and Dynamic Properties (Zoo'!. ParsU'wski) 2.2 Stiffness and Damping Characteristics of Tilting-PAD Journal Bearings (H. Springer) . . . . . . . . . . . . . . . . . . . . . . . 2.3 Principles of Rotor System Instability (Z.ll. Parszewski) 2.4 Fluid Film and Instability (Z.A. Parszewski) . 2.5 Stability of Rotors in Bearings (S.F. Rieger) 2.6 Supression of Rotor Instability (.\'.F. Rieger) 2.7 Hysteretic Instability (S.P. Rieger) . . . . . 2.8 Fluid Instability (.\·.F. Rieger) . . . . . . .
