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The Effect of Blade Discretization on Resonant Turbine Blade Response FREE

[+] Author Affiliations
Chia-Fu Sheng

Perkin-Elmer Corporation, Danbury, CT

John G. Mosimann

Ingersoll-Rand Company, Windsor, CT

Paper No. 83-GT-158, pp. V005T12A015; 5 pages
doi:10.1115/83-GT-158
From:
  • ASME 1983 International Gas Turbine Conference and Exhibit
  • Volume 5: Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; Process Industries
  • Phoenix, Arizona, USA, March 27–31, 1983
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7955-9
  • Copyright © 1983 by ASME

abstract

The two methods currently used in industry to calculate blade resonant responses, the energy method and the transmissibility method, are discussed relative to accuracy and facility. Although identical in form for the ideal case, the methods differ in accuracy for practical cases depending on discretization, i.e., model lumped mass breakup fineness. For clarity, the equations for these two methods are derived for a Timoshenko beam and solved numerically for a beam with varying discretization. The results show resonant stress differences up to 30% for higher modes using limited but equal discretization, proving the practical superiority of the energy method over the transmissibility method by example as well as by theory.

Copyright © 1983 by ASME
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