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

Petrov, E P (2017) Frequency-domain sensitivity analysis of stability of nonlinear vibrations for high-fidelity models of jointed structures. Proceedings of ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition, Charlotte, USA, 26-30 June 2017. Published in: Journal of Engineering for Gas Turbines and Power. American Society of Mechanical Engineers ISSN 0742-4795 ISBN 9780791850930 (Accepted)

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Abstract

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.

Item Type: Conference Proceedings
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Research Centres and Groups: Dynamics, Control and Vehicle Research Group
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TJ Mechanical engineering and machinery > TJ0170 Mechanics applied to machinery. Dynamics
Depositing User: Yevgen Petrov
Date Deposited: 04 Sep 2017 10:14
Last Modified: 04 Sep 2017 10:14
URI: http://sro.sussex.ac.uk/id/eprint/69980

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