Title
Detection and quantification of the influence of time variation in frequency response function measurements using arbitrary excitations
Author
Faculty/Department
Faculty of Applied Engineering Sciences
Publication type
article
Publication
Subject
Engineering sciences. Technology
Source (journal)
IEEE Transactions on Instrumentation and Measurement
Volume/pages
61(2012) :12 , p. 3387-3395
ISSN
0018-9456
ISI
000311352900030
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
This paper presents a nonparametric method for detecting and quantifying the influence of time variation in frequency response function measurements. The method is based on the estimation of the best linear time-invariant (BLTI) approximation of a linear time-variant (LTV) system from known input, noisy output data. The key idea consists in reformulating the single-input, single-output time-variant problem as a multiple-input, single-output time-invariant problem. In addition to the BLTI approximation of the LTV system, the contribution of the disturbing noise, the leakage error, and the time-varying effects at the output is also quantified. As such, the approximation error of the time-invariant framework is known.
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