elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Normal Mode Testing by Multi-Axial Base Excitation.

Sinapius, M. (1997) Normal Mode Testing by Multi-Axial Base Excitation. In: International Forum on Aeroelasticity and Structural Dynamics, 1997, Volume III, pp. 209-214. CEAS - International Conference on Aeroelasticity and Structural 17-20 June, 1997, Rome, Italy.

Full text not available from this repository.

Abstract

Normal mode testing is commonly performed by multiple point excita- tion. For each normal mode the exciter configuration is adapted in location and magnitude in order to compensate for the internal damping forces of the test structure. An alternative to multiple point excitation is a driven-base test using a multi-axial shaker table. Multi-axis shaker facilities have been developed for structural dynamic qualification. However, they can be used for normal mode testing as well. Then, the overall structure is accelerated in space in order to compensate for the internal damping forces. This requires a suitable combination of all six spatial degrees of freedom of the base excitation. In the case of resonance, the structure responds in quadrature related to the base excitation. If this criterion is fulfilled, the structure vibrates in an eigenmode of vibration in the sense of a single degree of freedom system. The paper summarizes the theoretical background of the test method with particular emphasis on the damping estimation, on the determination of the generalized mass, and on finding a suitanble base axis combination. A suitable test rig for the normal mode testing by base excitation, DLR's multi- axis vibration simualtor MAVIS in Goettingen (FRG) is presented. The test procedure and test data evaluation are elucidated. The application on a test structure characterized by closely-spaced eigenfrequencies is presented. The advantages and disadvantages of normal mode testing by means of base excitation are pointed out.

Item URL in elib:https://elib.dlr.de/39816/
Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1997,
Title:Normal Mode Testing by Multi-Axial Base Excitation.
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Sinapius, M.UNSPECIFIEDUNSPECIFIED
Date:1997
Journal or Publication Title:International Forum on Aeroelasticity and Structural Dynamics, 1997, Volume III
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 209-214
Series Name:Volume II
Status:Published
Keywords:experimental modal analysis, multi-axial base excitation, normal mode testing
Event Title:CEAS - International Conference on Aeroelasticity and Structural 17-20 June, 1997, Rome, Italy
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 10:55

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.