Title
Quantifying the time-variation in FRF measurements using random phase multisines with nonuniformly spaced harmonics Quantifying the time-variation in FRF measurements using random phase multisines with nonuniformly spaced harmonics
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
63(2014) :5 , p. 1384-1394
ISSN
0018-9456
ISI
000334608900042
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
Recently methods have been developed to detect and quantify the influence of time-variation in frequency response function measurements using random excitations. These methods can also be applied to random phase multisine excitations, provided uniformly spaced excited harmonics. However, in quite a few applications, a nonuniform harmonic spacing is required, for example, a quasi-logarithmic spacing to cover a large frequency range, and a random spacing to detect and quantify nonlinear distortions. Therefore, in this paper, the results are extended to random phase multisines with nonuniformly spaced harmonics. An in-depth study of the noise sensitivity (bias and variance) of the proposed procedure is made.
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