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Analysis of the bias in modal parameters obtained with frequency-domain rational fraction polynomial estimators

Böswald, Marc (2016) Analysis of the bias in modal parameters obtained with frequency-domain rational fraction polynomial estimators. In: Proceedings of ISMA 2016, pp. 2907-2921. ISMA 2016, 19.-21. Sept. 2016, Leuven, Belgium. ISBN 9789073802940

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Abstract

Modal parameter estimators based on frequency-domain rational fraction polynomials are most commonly used for experimental modal analysis. The Least-Squares Complex Frequency Domain (LSCF) estimator is a well-known member of this group of estimators. However, it has been found out that in particular the damping estimates are biased when the input data is contaminated with noise. Based on closed form analytical equations derived for the Peak-Fit estimator – the simplest single-degree of freedom modal parameter estimator based on frequency-domain rational fraction polynomials – the root cause of this bias is investigated in this paper. The LSCF estimator shows the same kind of bias as the simple Peak-Fit estimator. It is demonstrated for single- and multi-degree of freedom examples that the bias of the LSCF estimator is consistent with the closed form analytical equations of the Peak-Fit estimator. This information can be used to reduce bias of experimental modal analysis results or to improve estimators.

Item URL in elib:https://elib.dlr.de/108128/
Document Type:Conference or Workshop Item (Speech)
Title:Analysis of the bias in modal parameters obtained with frequency-domain rational fraction polynomial estimators
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Böswald, MarcUNSPECIFIEDUNSPECIFIED
Date:19 September 2016
Journal or Publication Title:Proceedings of ISMA 2016
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 2907-2921
Editors:
EditorsEmail
UNSPECIFIEDKU Leuven
ISBN:9789073802940
Status:Published
Keywords:Experimental Modal Analysis, Noise Contamination, Bias in Modal Parameters, Peak-Fit, LSCF
Event Title:ISMA 2016
Event Location:Leuven, Belgium
Event Type:international Conference
Event Dates:19.-21. Sept. 2016
Organizer:KU Leuven
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Structural Dynamics and System Identification
Deposited By: Böswald, Dr.-Ing. Marc
Deposited On:09 Dec 2016 09:36
Last Modified:09 Dec 2016 09:36

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