Vibrating systems usually have an in"nite number of degrees of freedom (d.o.f.). Since a "nite number of measurement d.o.f. can only capture certain deformation patterns, the spatial characteristics of vibrating systems are only partially observed experimentally. This research examines the e!ects of
MEASUREMENT AND MODELLING OF LINEAR SYSTEMS IN THE PRESENCE OF NON-LINEAR DISTORTIONS
β Scribed by R. PINTELON; J. SCHOUKENS
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 306 KB
- Volume
- 16
- Category
- Article
- ISSN
- 0888-3270
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β¦ Synopsis
In [3] the measurement and modelling of linear systems in the presence of non-linear distortions has been studied for a special class of periodic excitation signals. This paper extends the theory of [3] to more general classes of (periodic) excitation signals. Also, enhanced properties of the best linear approximation and the stochastic non-linear distortions are obtained. The theory is illustrated on a simulation and a real measurement example.
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In this paper, simple methods are described to detect, qualify and quantify the presence of non-linear distortions. Their impact on FRF measurements is discussed. The techniques are illustrated on experimental results. ## 2000 Academic Press RThis work was supported by the FWO-Vlaanderen, the Flem