Title
Detecting a time-varying behavior in frequency response function measurements
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) :8 , p. 2132-2143
ISSN
0018-9456
ISI
000306519900008
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
This paper provides data-driven tools to detect and quantify approximately the influence of the time variation of a system under test in classical frequency response function (FRF) measurements. To achieve this, the best linear time-invariant approximation of a linear time-varying system is defined and is estimated using existing FRF estimators. An analysis of the residuals of the latter estimation reveals the frequency band in which the contributions from the time variation dominates the disturbing measurement noise and, thus, is significant. All concepts are illustrated on a simulation and real measurement examples.
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