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Identification of mode shapes with an adapted resolution using a continuously scanning laser doppler vibrometer

Brehmer, A. and Sinapius, M. (2001) Identification of mode shapes with an adapted resolution using a continuously scanning laser doppler vibrometer. IFASD, Madrid/Spain, June 5-7 2001.

Full text not available from this repository.

Abstract

The paper presents a method of measuring responses for a sinusoidally excited structure using a continuously scanning Laser Doppler Vibrometer (LDV). The LDV output signal is an amplitude-modulated vibration in which the excitation signal is modulated by the response of the excited structure. The mode shape defined along a scan path can be derived by the envelope of the modulated vibration using an applicable demodulation. For an optimized identification of the tuned mode shape, it is possible to adapt the scan path to the characteristics of the selected mode shape. Therefore the laser beam is driven with varying instead of constant scan frequencies over the surface of the test object during one scan. An algorithm was developed to derive an application function for the mirror drive signals from the measured responses along the scan path. The algorithm calculates the gradient of the measured responses and derives an optimized scan frequency and scan path, respectively. The scan frequency here is inversely proportional to the gradient of the measured responses. Hence the resolution and sampling rate could be adapted to the characteristics of the tuned mode shape.

Item URL in elib:https://elib.dlr.de/14255/
Document Type:Conference or Workshop Item (Speech)
Additional Information: LIDO-Berichtsjahr=2001,
Title:Identification of mode shapes with an adapted resolution using a continuously scanning laser doppler vibrometer
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Brehmer, A.UNSPECIFIEDUNSPECIFIED
Sinapius, M.UNSPECIFIEDUNSPECIFIED
Date:2001
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 145-156
Status:Published
Keywords:Scanning Laser Vibrometer, Resonance Testing
Event Title:IFASD, Madrid/Spain, June 5-7 2001
Organizer:CASA/AIAE
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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