Widanage, Widanalage Dhammika and Schoukens, J. (2011) Assigning the nonlinear distortions of a two-input single-output system. In: 28th IMAC, A Conference on Structural Dynamics, Jacksonville, Florida, USA, 1-4 Feb 2010.. Published in: Nonlinear Modeling and Applications, Volume 2 : Proceedings of the 28th IMAC, A Conference on Structural Dynamics, 2010 pp. 9-19. ISBN 9781441997180. ISSN 2191-5644. doi:10.1007/978-1-4419-9719-7_2

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Abstract

In a multiple-input multiple-output (MIMO) nonlinear system the nonlinear contributions from each input to each output may vary significantly. The nonlinear distortions are composed of contributions that are either purely due to each individual input or a combination with some of the inputs. A three stage experimental design method valid for a wide range of nonlinear systems is presented that detects and classifies, in the frequency domain, the level of these nonlinear contributions. For systems that require nonzero operating points, the contribution from each input and their combinations is conditioned by the operating levels. Periodic broadband excitation signals with several harmonics suppressed are used as the inputs to reduce the noise contributions and evaluate the nonlinear distortion levels present at the suppressed harmonics. Alternatively, each input signal can be designed with a harmonic specification such that the harmonics of the output signal indicate the presence of these nonlinear contributions. As a single experiment technique it requires less time for measurements, however the input harmonics become very sparse as the order of the nonlinearity increase that the signals becomes impractical for experimental use. Experimental results for a two-input single-output system are presented demonstrating the effectiveness of the techniques.

Item Type:	Conference Item (Paper)
Divisions:	Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Journal or Publication Title:	Nonlinear Modeling and Applications, Volume 2 : Proceedings of the 28th IMAC, A Conference on Structural Dynamics, 2010
ISBN:	9781441997180
ISSN:	2191-5644
Book Title:	Nonlinear Modeling and Applications, Volume 2
Official Date:	April 2011
Dates:	Date Event April 2011 Published
Page Range:	pp. 9-19
DOI:	10.1007/978-1-4419-9719-7_2
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Conference Paper Type:	Paper
Title of Event:	28th IMAC, A Conference on Structural Dynamics
Type of Event:	Workshop
Location of Event:	Jacksonville, Florida, USA
Date(s) of Event:	1-4 Feb 2010.

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