Practical Guidelines for Optimising the Measurement of Frequency Response and Coherence Functions with Digital Spectral Analysers

Research output: Chapter in Book/Report/Conference proceedingConference paperResearch

1 Citation (Scopus)

Abstract

In modern digital spectral analysers, frequency response functions and related quantities such as the coherence function are measured by means of the Weighted Overlapped Segment Averaging (WOSA) technique. There are surprisingly very few results concerning the opimal setting of the parameters in WOSA and their impact on the precision and accuracy of the measurements. In this paper, we provide the optimal window shape and the optimal percentage of overlap to be used with WOSA, together with the bias and variance formulae of frequency response and coherence functions in the general case. The distinction is made between the H1, H2 and H3 estimators. These results are illustrated in the context of experimental modal analysis.
Original languageEnglish
Title of host publicationProceedings of ISMA2006, International Conference on Noise and Vibration Engineering
Pages2451-2459
Number of pages8
Publication statusPublished - 18 Sep 2006
EventFinds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet - Stockholm, Sweden
Duration: 21 Sep 200925 Sep 2009

Conference

ConferenceFinds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet
CountrySweden
CityStockholm
Period21/09/0925/09/09

Keywords

  • measurement frequency response

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