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Frequency-domain sensitivity analysis of stability of nonlinear vibrations for high-fidelity models of jointed structures

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conference contribution
posted on 2023-06-09, 07:46 authored by Yevgen PetrovYevgen Petrov
For the analysis of essentially nonlinear vibrations it is very important not only to determine whether the considered vibration regime is stable or unstable but also which design parameters need to be changed to make the desired stability regime and how sensitive is the stability of a chosen design of a gas-turbine structure to variation of the design parameters. In the proposed paper, an efficient method is proposed for a first time for sensitivity analysis of stability for nonlinear periodic forced response vibrations using large-scale models structures with friction, gaps and other types of nonlinear contact interfaces. The method allows using large-scale finite element models for structural components together with detailed description of nonlinear interactions at contact interfaces. The highly accurate reduced models are applied in the assessment of the sensitivity of stability of periodic regimes. The stability sensitivity analysis is performed in frequency domain with the multiharmonic representation of the nonlinear forced response amplitudes. Efficiency of the developed approach is demonstrated on a set of test cases including simple models and large-scale realistic blade model with different types of nonlinearities, including: friction, gaps, and cubic elastic nonlinearity.

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

Event name

Proceedings of ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition

Event location

Charlotte, USA

Event type

conference

Event date

26-30 June 2017

ISBN

9780791850930

Department affiliated with

  • Engineering and Design Publications

Research groups affiliated with

  • Dynamics, Control and Vehicle Research Group Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2017-09-04

First Open Access (FOA) Date

2018-08-01

First Compliant Deposit (FCD) Date

2017-09-03

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