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Mistuning Identification for Integrally Bladed Disks Based on the SNM Technique

[+] Author Affiliations
Shuai Wang, Jianyao Yao, Jianjun Wang

Beijing University of Aeronautics and Astronautics, Beijing, China

Paper No. GT2010-22105, pp. 749-756; 8 pages
doi:10.1115/GT2010-22105
From:
  • ASME Turbo Expo 2010: Power for Land, Sea, and Air
  • Volume 6: Structures and Dynamics, Parts A and B
  • Glasgow, UK, June 14–18, 2010
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4401-4 | eISBN: 978-0-7918-3872-3
  • Copyright © 2010 by ASME

abstract

A new mistuning identification method based on the Subset of Nominal Modes (SNM) theory for the integrally bladed disk is presented. In this approach, steady-state responses from experiments are used as input parameters for identification without requiring the knowledge of the applied forces. This makes the input data more reliable and reduces the measurement difficulty. The method is especially suitable for the bladed disk situation in which the high modal density or relatively high damping leads the isolation of normal modes more difficult. The submatrix method enables the definition of mistuning parameters more freely and adds the model modification function to this identification method. The improved identification method introduced in this paper could simultaneously identify both the blade mistuning parameters and tuned natural frequencies to avoid the adverse influences of the errors in tuned natural frequencies and greatly increase the accuracy of identified mistuning. Finally, numerical example of a fan bladed disk is preformed to validate the effectiveness of the proposed identification method.

Copyright © 2010 by ASME
Topics: Disks

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