0

Specifics of Damping Evaluation in Rotating Machines FREE

[+] Author Affiliations
Agnes Muszynska

Bently Rotor Dynamics Research Corporation, Minden, NV

Paper No. 96-TA-004, pp. V001T08A001; 8 pages
doi:10.1115/96-TA-004
From:
  • ASME 1996 Turbo Asia Conference
  • ASME 1996 Turbo Asia Conference
  • Jakarta, Indonesia, November 5–7, 1996
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7877-4
  • Copyright © 1996 by ASME

abstract

Focused on rotor lateral modes, the paper discusses specifics of damping evaluation in rotating machines. Rotors force the fluid trapped in small rotor-to-stator radial clearances to rotate in circumferential fashion. The fluid in circumferential motion generates a tangential force acting in feedback on the rotor. This force direction is opposite to that of damping force. The “effective damping” is, therefore, reduced or even nullified by the fluid interaction effects. The classical measures of damping in mechanical structures, such as Logarithmic Decrement and Amplification Factor, which are used to evaluate machine susceptibility to instability based on documented vibration data, have to be adjusted to include the fluid interaction effects. These measures now represent the measures of Quadrature Dynamic Stiffness (QDS). It is shown that they contain the expression defined as Stability Margin (or Nondimensional Stability Margin), derived from the stability condition of the rotor system. A simple model of isotropic rotor lateral vibrations is used to obtain the QDS measures.

Copyright © 1996 by ASME
Topics: Machinery , Damping
This article is only available in the PDF format.

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In