CUED Publications database

State-space realization of a describing function

Ghirardo, G and Ćosić, B and Juniper, MP and Moeck, JP (2015) State-space realization of a describing function. Nonlinear Dynamics, 82. pp. 9-28. ISSN 0924-090X

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Abstract

© 2015, Springer Science+Business Media Dordrecht. The describing function is a powerful tool for characterizing nonlinear dynamical systems in the frequency domain. In some cases, it is the only available description of a nonlinear operator characterizing a certain subcomponent of the system. This paper presents a methodology to provide a state-space realization of one given describing function, in order to allow the study of the system in the time domain as well. The realization is based on Hammerstein models and Fourier–Bessel series. It can be embedded in time domain simulations of complex configurations with many nonlinear elements interacting, accurately describing the nonlinear saturation of the system. The technique is applied to an example application in the field of combustion instability, featuring self-excited thermoacoustic oscillations. We benchmark the performance of the tool comparing the results with a frequency domain analysis of the same system, obtaining good agreement between the two formulations.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div A > Energy
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 18:57
Last Modified: 23 Nov 2017 04:14
DOI: