6. Fluid Seals and Their Effect on Rotordynamics

  1. John Vance,
  2. Fouad Zeidan and
  3. Brian Murphy

Published Online: 3 MAY 2010

DOI: 10.1002/9780470903704.ch6

Machinery Vibration and Rotordynamics

Machinery Vibration and Rotordynamics

How to Cite

Vance, J., Zeidan, F. and Murphy, B. (2010) Fluid Seals and Their Effect on Rotordynamics, in Machinery Vibration and Rotordynamics, John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470903704.ch6

Publication History

  1. Published Online: 3 MAY 2010
  2. Published Print: 12 MAY 2010

ISBN Information

Print ISBN: 9780471462132

Online ISBN: 9780470903704



  • fluid seals - effect on rotordynamics;
  • function of noncontacting fluid seal - reducing leakage flow rate;
  • seals - lateral forces on shaft;
  • major types of fluid seals - plain, floating ring oil, labyrinth;
  • primary components in Helmhotlz resonator - air cavity, port connecting rest of system


This chapter contains sections titled:

  • Function and Classification of Seals

  • Understanding and Modeling Damper Seal Force Coefficients

  • Alford's Hypothesis of Labyrinth Seal Damping

  • Cross-coupled Stiffness Measurements

  • Invention of the Pocket Damper Seal

  • Pocket Damper Seal Theory

  • Rotordynamic Testing of Pocket Damper Seals

  • Impedance Measurements of Pocket Damper Seal Force Coefficients (Stiffness and Damping) and Leakage at Low Pressures

  • The Fully Partitioned PDS Design

  • Effects of Negative Stiffness

  • Frequency Dependence of Damper Seals

  • Laboratory Measurements of Stiffness and Damping from Pocket Damper Seals at High Pressures

  • Field Experience with Pocket Damper Seals

  • Designing for Desired Force Coefficient Characteristics

  • Some Comparisons of Different Types of Annular Gas Seals

  • References