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Mistuning and Damping Experiments at Design Speed Combined With Computational Tools

[+] Author Affiliations
Kiran D’Souza, Mike Dunn

Ohio State University, Columbus, OH

Bogdan I. Epureanu

University of Michigan, Ann Arbor, MI

Paper No. GT2017-63287, pp. V07BT35A005; 8 pages
doi:10.1115/GT2017-63287
From:
  • ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
  • Volume 7B: Structures and Dynamics
  • Charlotte, North Carolina, USA, June 26–30, 2017
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5093-0
  • Copyright © 2017 by ASME

abstract

This paper describes a combined experimental/analytical effort which will provide measurements specifically designed to verify computational tools developed for turbomachinery applications. The hardware used for these measurements is engine-type hardware that will be operated at design speed. The specific hardware to be used is NASA Rotor 67 and the measurements will be performed in the confines of an underground spin pit facility. The experiments are aimed at identifying damping and mistuning properties of the rotor while it rotates at predetermined speed values within the facility. In addition, experiments using a modified Rotor 67 configuration containing added frictional damping elements are described. Light probe and strain gauge data will be obtained in order to compare their individual effectiveness. The response data storage is based on wide bandwidth, low noise signal conditioners used in conjunction with a high sampling-frequency data acquisition system. The rotor can be excited at specific engine-order crossings using air-jets with the number of specific active air-jets and the corresponding force transmitted by each jet estimated from computations. The experimental effort enables the identification of key parameters used in a series of computational tools that have been developed recently. The computational tools include various mistuning and (nonlinear) damping identification methods that have not yet been verified using data obtained from rotating hardware.

Copyright © 2017 by ASME
Topics: Damping , Design

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