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Damping estimation from modal decay during normal mode testing

Sinapius, M. and Füllekrug, U. (2001) Damping estimation from modal decay during normal mode testing. IFASD, Madrid/Spain, June 5-7 2001.

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Abstract

The classical Phase Resonance Method is frequently applied for the experimental identification of modal parameters of large and complex aerospace structures. The identification of damping is usually realized under some limiting assumptions. This paper describes an alternate method for the estimation of the damping. The method is based on free decay vibrations occuring after the deactivation of a tuned excitation vector. The free decay vibrations are analyzed with the Ibrahim Time Domain method. Two variants are investigated. The first variant analyses the sensor signals directly whereas the second variant analyses modally transformed responses. The approach is demonstrated on a laboratory type structure and with measured data of a Ground Vibration Test on an Airbus. The results show that reliable values for eigenfrequency and damping can be obtained. The modal transformation with the previously tuned normal mode appears to be a quick and highly effective way to estimate the damping.

Item URL in elib:https://elib.dlr.de/14254/
Document Type:Conference or Workshop Item (Speech)
Additional Information: LIDO-Berichtsjahr=2001,
Title:Damping estimation from modal decay during normal mode testing
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Sinapius, M.UNSPECIFIEDUNSPECIFIED
Füllekrug, U.UNSPECIFIEDUNSPECIFIED
Date:2001
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 157-167
Status:Published
Keywords:Structural Dynamics, Modal Analysis, Ground Vibration Testing, Damping
Event Title:IFASD, Madrid/Spain, June 5-7 2001
Organizer:CEAS / AIAA / ICASE / NASA Langley
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L ST - Starrflüglertechnologien
DLR - Research theme (Project):L - Flexible Aircraft (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Deposited By: Erdmann, Daniela
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 21:37

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