Proceedings ArticleDOI
System identification in a real world
Joannes Schoukens,Anna Marconato,Rik Pintelon,Yves Rolain,Maarten Schoukens,Koen Tiels,Laurent Vanbeylen,Gerd Vandersteen,A. Van Mulders +8 more
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TLDR
This paper discusses both options for identification of linear models in the presence of nonlinear distortions, including the generation of error bounds, and a double approach is proposed, using either unstructured nonlinear state space models, or highly structured block oriented nonlinear models.Abstract:
In this paper we discuss how to identify a mathematical model for a (non)linear dynamic system starting from experimental data. In the initial step, the frequency response function is measured, together with the properties of the disturbing noise and the nonlinear distortions. This uses nonparametric preprocessing techniques that require very little user interaction. On the basis of this information, the user can decide on an objective basis, in an early phase of the modelling process, to use either a simple linear approximation framework, or to build a more involved nonlinear model. We discuss both options here: i) Identification of linear models in the presence of nonlinear distortions, including the generation of error bounds; and ii) Identification of a nonlinear model. For the latter, a double approach is proposed, using either unstructured nonlinear state space models, or highly structured block oriented nonlinear models. The paper is written from a users perspective.read more
Citations
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Book ChapterDOI
Nonlinear System Identification
TL;DR: This chapter contains sections titled: Historical Review Supervised Multilayer Networks unsupervised Neural Networks: Kohonen Network Unsupervised Networks: Adaptive Resonance Theory Network Model Validation and Recommended Exercises.
Identification of Linear Systems with Nonlinear Distortions
TL;DR: A theoretical framework is proposed that extends the linear system description to include the impact of nonlinear distortions: the nonlinear system is replaced by a linear model plus a 'nonlinear noise source'.
Journal ArticleDOI
Linear System Identification in a Nonlinear Setting: Nonparametric Analysis of the Nonlinear Distortions and Their Impact on the Best Linear Approximation
TL;DR: In this paper, a linear dynamic time-invariant model is identified to describe the relationship between the reference signal and the output of the system, and the power spectrum of the unmodeled disturbances are identified to generate uncertainty bounds on the estimated model.
Journal ArticleDOI
Linear System Identification in a Nonlinear Setting - Nonparametric analysis of the nonlinear distortions and their impact on the best linear approximation
TL;DR: A linear dynamic time-invariant model is identified to describe the relationship between the reference signal and the output of the system and the power spectrum of the unmodeled disturbances are identified to generate uncertainty bounds on the estimated model.
References
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Book
System Identification: A Frequency Domain Approach
Rik Pintelon,Joannes Schoukens +1 more
TL;DR: Focusing mainly on frequency domain techniques, System Identification: A Frequency Domain Approach, Second Edition also studies in detail the similarities and differences with the classical time domain approach.
Journal ArticleDOI
Fading memory and the problem of approximating nonlinear operators with Volterra series
Stephen Boyd,Leon O. Chua +1 more
TL;DR: In this article, it was shown that any time-invariant continuous nonlinear operator with fading memory can be approximated by a Volterra series operator, and that the approximating operator can be realized as a finite-dimensional linear dynamical system with a nonlinear readout map.
BookDOI
Block Oriented Nonlinear System Identification
Fouad Giri,Er-Wei Bai +1 more
TL;DR: In this article, an optimal two-stage identification algorithm for Hammerstein-Wiener Nonlinear Systems was proposed. But the method was not suitable for the case of hard memory nonlinearities of known structure.