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Identification of Free and Fixed Normal Modes by Base Excitation.

Sinapius, M. (1996) Identification of Free and Fixed Normal Modes by Base Excitation. In: Proceedings of the XIVth International Modal Analysis Conference, Proc. Vol I, pp.23-31, pp. 23-31. XIVth Int'l Modal Analysis Conference (IMAC), Dearborn, MI, USA, Feb. 12-15, 1996.

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Abstract

Most of the commonly used modal testing methods are based on multiple point excitation. The interface conditions of the test structure are usually either fixed or free. However, both interface conditions cannot be completely realized in the experiment. An alternative to multiple-point excitation is driven-base testing using a multi-axis shaker table. Up to now, only the fixed interface normal modes could be extracted from the measured structural responses. This paper presents a method of identifying the free interface normal modes by means of driven base tests. Therefore, the interface forces between the test structure and the shaker table have to be measured. A test example as well as a suitable test rig containing a force measurement device and a multi-axis vibration simulator is described in this paper. Typical measurement data are shown and extracted modal data for both fixed and free interface normal modes are included as an example. Finally, the advantages and disadantages of modal parameter identification by base excitation are discussed.

Item URL in elib:https://elib.dlr.de/39790/
Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1996,
Title:Identification of Free and Fixed Normal Modes by Base Excitation.
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Sinapius, M.UNSPECIFIEDUNSPECIFIED
Date:1996
Journal or Publication Title:Proceedings of the XIVth International Modal Analysis Conference, Proc. Vol I, pp.23-31
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 23-31
Status:Published
Keywords:modal analysis, driven base test, multi-axis vibration simulation
Event Title:XIVth Int'l Modal Analysis Conference (IMAC), Dearborn, MI, USA, Feb. 12-15, 1996
HGF - Research field:UNSPECIFIED
HGF - Program:Space (old)
HGF - Program Themes:W RP - Raumtransport
DLR - Research area:UNSPECIFIED
DLR - Program:W RP - Raumtransport
DLR - Research theme (Project):UNSPECIFIED
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Deposited By: DLR-Beauftragter, elib
Deposited On:02 Apr 2006
Last Modified:27 Apr 2009 10:54

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