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Analysis of swept-sine runs during modal identification

Sinapius, M. and Gloth, G. (2004) Analysis of swept-sine runs during modal identification. ELSEVIER - Mechanical Systems and Signal Processing, 18 (6), pp. 1421-1441.

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Abstract

Experimental modal analysis of large aerospace structures in Europe combine nowadays the benefits of the very reliable but time-consuming phase resonance method and the application of phase separation techniques evaluating frequency response functions (FRF). FRFs of a test structure can be determined by a variety of means. Applied excitation signal waveforms include harmonic signals like stepped-sine excitation, periodic signals like multi-sine excitation, transient signals like impulse and swept-sine excitation, and stochastic signals like random. The current article focuses on slow swept-sine excitation which is a good trade-off between magnitude of excitation level needed for large aircraft and testing time. However, recent ground vibration tests (GVTs) brought up that reliable modal data from swept-sine test runs depend on a proper data processing. The article elucidates the strategy of modal analysis based on swept-sine excitation. The standards for the application of slowly swept sinusoids defined by the international organisation for standardisation in ISO 7626 part 2 are critically reviewed. The theoretical background of swept-sine testing is expounded with particular emphasis to the transition through structural resonances. The effect of different standard procedures of data processing like tracking filter, fast Fourier transform (FFT), and data reduction via averaging are investigated with respect to their influence on the FRFs and modal parameters. Particular emphasis is given to FRF distortions evoked by unsuitable data processing. All data processing methods are investigated on a numerical example. Their practical usefulness is demonstrated on test data taken from a recent GVT on a large aircraft. The revision of ISO 7626 part 2 is suggested regarding the application of slow swept-sine excitation. Recommendations about the proper FRF estimation from slow swept-sine excitation are given in order to enable the optimisation on these applications for future modal survey tests of large aerospace structures.

Item URL in elib:https://elib.dlr.de/14498/
Document Type:Article
Additional Information: LIDO-Berichtsjahr=2005,
Title:Analysis of swept-sine runs during modal identification
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Sinapius, M.UNSPECIFIEDUNSPECIFIED
Gloth, G.UNSPECIFIEDUNSPECIFIED
Date:2004
Journal or Publication Title:ELSEVIER - Mechanical Systems and Signal Processing
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:18
Page Range:pp. 1421-1441
Status:Published
Keywords:Experimental Modal Analysis, Swept sine, Signal Processing
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):UNSPECIFIED
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Deposited By: Wolff, Sibylle
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 21:56

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