Nonlinearity assessment of mimo electroacoustic systems on direct field environmental acoustic testing

Mariano Alvarez Blanco, Péter Zoltán Csurcsia, Bart Peeters, Karl Janssens, Wim Desmet

Research output: Chapter in Book/Report/Conference proceedingConference paper

2 Citations (Scopus)

Abstract

Direct Field Environmental Acoustic testing consists in reproducing the sound field inside a spacecraft vehicle's fairing using an array of loudspeakers. In order to ensure the accurate reproduction of the sound pressure field, the actuators need to be actively controlled. The performance of state-of-the-art Multiple-Input Multiple-Output (MIMO) random controllers is strongly dependent on the control strategy. The system identification, methodology applied at low power level excitation before the test, is one of the most sensitive aspects of such strategy. This is because it provides a linear nonparametric model of the electroacoustic system, which is used to design the signals to drive the loudspeakers. In this work novel system identification strategy is explored. The proposed method is a MIMO Best Linear Approximation (BLA). In this technique, instead of using classical excitation signals and the H1 estimate, a BLA model is estimated, and the coherence function is split into noise level and nonlinear contribution estimates.

Original languageEnglish
Title of host publicationISMA International conference on Noise and Vibration Engineering
EditorsD. Moens, W. Desmet, B. Pluymers, W. Rottiers
Pages457-471
Number of pages15
ISBN (Electronic)9789073802995
Publication statusPublished - 19 Sep 2018
EventISMA 2018 -
Duration: 17 Sep 201819 Sep 2018
https://www.isma-isaac.be/isma2018/

Publication series

NameProceedings of ISMA 2018 - International Conference on Noise and Vibration Engineering and USD 2018 - International Conference on Uncertainty in Structural Dynamics

Conference

ConferenceISMA 2018
Period17/09/1819/09/18
Internet address

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