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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
  • 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


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



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