0

Full Content is available to subscribers

Subscribe/Learn More  >

Constraint on Aeroengine Design by Loss of Grounding in Vibration Physics

[+] Author Affiliations
Nicholas Klompas

Consultant, Waterford, NY

Paper No. GT2004-53033, pp. 13-23; 11 pages
doi:10.1115/GT2004-53033
From:
  • ASME Turbo Expo 2004: Power for Land, Sea, and Air
  • Volume 2: Turbo Expo 2004
  • Vienna, Austria, June 14–17, 2004
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4167-7 | eISBN: 0-7918-3739-4
  • Copyright © 2004 by ASME

abstract

The need for a broad, design-oriented view of engine dynamics is illustrated by four incidents where “today’s science” missed mechanisms critical in the high-bypass turbofan. In missing the significance of Rankine’s 1869 observation of the destabilizing/stabilizing mechanism in line shafts, experts for over 88 years have discounted the action of drive torque on turbomachine whirl. As a consequence, a vital lesson in the Lockheed Electra crashes of 1959–1960 was missed. The suspected Electra propeller-nacelle whirl is examined to create a simple & realistic analytical model showing how coupling between forward and backward whirl in the whole power plant, including associated propeller flexing, poses potential whirl amplification/modulation by torque loading. The model illustrates mechanisms essential to the cited new, physics-based, design analysis of vibrations in a whole engine via distinct waves. The prevailing presumption that an interlocked shroud inevitably produces friction damping is contradicted by a 1989 airline crash investigation.

Copyright © 2004 by ASME
Topics: Physics , Design , Vibration

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