LITMIR.BIZ

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      This Work is a co‐publication between John Wiley & Sons Ltd and ASME Press

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       Library of Congress Cataloging‐in‐Publication Data

      Names: Breńkacz, Łukasz, author.

      Title: Bearing dynamic coefficients in rotordynamics : computation methods and practical applications / Łukasz Breńkacz.

      Description: First edition. | Hoboken, NJ : Wiley, 2021. | Includes bibliographical references and index.

      Identifiers: LCCN 2020053700 (print) | LCCN 2020053701 (ebook) | ISBN 9781119759263 (hardback) | ISBN 9781119759249 (adobe pdf) | ISBN 9781119759171 (epub) | ISBN 9781119759287 (obook)

      Subjects: LCSH: Rotors–Dynamics. | Bearings (Machinery)

      Classification: LCC TJ1058 .B74 2022 (print) | LCC TJ1058 (ebook) | DDC 621.8/2–dc23

      LC record available at https://lccn.loc.gov/2020053700 LC ebook record available at https://lccn.loc.gov/2020053701

      Cover Design: Wiley

      Cover Image: © photosoup/iStock/Getty Images

       to my wife Dagmara, my daughter Agata, and my son Wojciech

      List of Tables

Table 3.1	Successive eigenfrequencies and the corresponding damping values calculated for the laboratory test rig.
Table 5.1	Parameters of the numerical model.
Table 5.2	Stiffness coefficients.
Table 5.3	Damping coefficients.
Table 5.4	Mass coefficients.
Table 7.1	Summary of the real and calculated stiffness, damping and mass coefficients for the two bearings for the reference case; representation of the relative calculations error.
Table 7.2	Summary of the real and calculated stiffness, damping, and mass coefficients for the two bearings for a case with displaced force; results “with correction” take into account the uneven distribution of excitation force in the calculation procedure.
Table 7.3	Summary of the real and calculated stiffness, damping and mass coefficients for the two bearings for a case with an excitation at an angle of α = 15°.
Table 7.4	Summary of the real and calculated stiffness, damping and mass coefficients of two bearings for an asymmetrical rotor.
Table 8.1	Stiffness, damping and mass coefficients of the rotor–bearing system for the entire speed range.
Table 8.2	Standard deviation of stiffness, damping and mass coefficients of the rotor – bearing system for the entire speed range.
Table 9.1	Parameters of the numerical model in the KINWIR program.
Table 9.2	Stiffness and damping coefficients obtained from linear calculations in the KINWIR.
Table 9.3	Minimum and maximum values of stiffness coefficients (N/m) calculated in the NLDW program.
Table 9.4	Minimum and maximum values of damping coefficients (N·s/m) calculated in the NLDW program.
Table 10.1	Comparison of the calculated stiffness and damping coefficients for the three methods used for a speed of 3000 rpm.

Preface

      This monograph concerns the experimental and numerical methods of determination of dynamic coefficients of hydrodynamic radial bearings. Bearings are one of the basic elements influencing the dynamics of rotor machinery. The main parameters with which the operation of bearings can be described (and thus the operation of the entire rotating system) are their stiffness and damping coefficients.

      This book includes a chapter about practical applications of bearing dynamic coefficients. It is shown how changes of bearing dynamic coefficients affect the dynamic performance of rotating machinery. Some examples are included with all the necessary data to allow rotordynamics analysis to be conducted and the

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