Title page for ETD etd-11012008-063055


Type of Document Master's Thesis
Author Ahuja, Anil
URN etd-11012008-063055
Title Random vibrations of mistuned periodic structures
Degree Master of Science
Department Aerospace and Ocean Engineering
Advisory Committee
Advisor Name Title
Nikolaidis, Efstratios Committee Chair
Johnson, Eric R. Committee Member
Kapania, Rabesh K. Committee Member
Keywords
  • Turbomachines
Date of Defense 1990-02-02
Availability restricted
Abstract

Nearly periodic structures exhibit localized modes of vibration depending upon the ex· tent of the coupling and the disorder between their periodic components. These localized modes may cause excessive vibration amplitudes resulting in significantly higher stresses than the ones the structures have been designed to withstand.

The Rayleigh-Ritz method, as employed earlier, for dynamic analysis for two-span beams could predict only the lower modes of vibration at prohibitive computational expense. A semi-analytical method which predicts even the higher modes at significantly reduced cost has been applied to the free vibration analysis of two-span beams. This method has been applied to the forced vibration analysis of a couple of mistuned turbine blades modeled as a two- span beam rotating in a turbulent flow field. It is shown that the maximum vibration amplitude of the mistuned structure may increase by several hundred percent as compared to that of the perfectly ordered structure.

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