14th IFAC Symposium on System Identification, SYSID 2006

SYSID-2006 Paper Abstract

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Paper WeB2.2

Antoni, Jérôme (Univ. of Tech. of Compiegne), Schoukens, Johan (Vrije Univ. Brussel)

FRF Measurements with the Weighted Overlapped Segment Averaging Technique

Scheduled for presentation during the Regular Session "Identification of Linear Systems I" (WeB2), Wednesday, March 29, 2006, 15:50−16:10, Banquet Room

14th IFAC Symposium on System Identification, March 29 - 31, 2006, Newcastle, Australia

This information is tentative and subject to change. Compiled on July 22, 2018

Keywords Frequency Domain Identification, Nonparametric Methods, Vibration and Model Analysis

Abstract

This paper investigates the measurement errors involved in estimating frequency response functions from weighted overlapped segment averaging, a technique that has become a standard in modern data analysers due to its computational advantages. A particular attention is paid to leakage errors, for which this technique has been frequently criticised. Our main result is that a Half-sine or Diff window with 67% overlap achieves the best compromise to reduce leakage errors, and this is independently of the system frequency response function. This conclusion is to be contrasted with the customary habit of using a Hanning window with 50% overlap.