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Forced response analysis of high-mode vibrations for mistuned bladed discs with effective reduced-order models

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posted on 2023-06-09, 01:15 authored by Yongliang Duan, Chaoping Zang, Yevgen PetrovYevgen Petrov
This paper is focused on the analysis of effects of mistuning on the forced response of gas-turbine bladed discs vibrating in the frequency ranges corresponding to higher modes. For high modes the blade aerofoils are deformed during vibrations and the blade mode shapes differ significantly from beam mode shapes. A model reduction technique is developed for the computationally efficient and accurate analysis of forced response for bladed discs vibrating in high frequency ranges. High-fidelity finite element models of a tuned bladed disc sector are used to provide primary information about dynamic properties of a bladed disc and the blade mistuning is modelled by specially defined mistuning matrices. The forced response displacement and stress amplitude levels are studied for high frequency ranges. The effects of different types of mistuning are examined and the existence of high amplifications of mistuned forced response levels is shown for high-mode vibrations: in some cases, the resonance peak response of a tuned structure can be lower than out-of-resonance amplitudes of its mistuned counterpart.

History

Publication status

  • Published

File Version

  • Accepted version

Journal

Journal of Engineering for Gas Turbines and Power

ISSN

0742-4795

Publisher

American Society of Mechanical Engineers

Issue

11

Volume

138

Article number

a112502

Department affiliated with

  • Engineering and Design Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2016-05-16

First Open Access (FOA) Date

2018-07-31

First Compliant Deposit (FCD) Date

2016-05-15

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