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Rigid Body Mode Identification of the PAH-2 Helicopter using the Eigensystem Realization Algorithm.

Schenk, A. and Pappa, R.S. (1991) Rigid Body Mode Identification of the PAH-2 Helicopter using the Eigensystem Realization Algorithm. DLR-Interner Bericht. 232-91 J 07, 49 S.

Full text not available from this repository.

Abstract

The rigid body modes of the PAH-2 'TIGER' helicopter were identified using the Eigensystem Realization Algorithm (ERA). This work complements ground vibration tests performed using DLR's traditional phase resonance technique and ISSPA. Rigid body modal parameters are important for ground resonance prediction. Time-domain data for ERA were obtained by inverse Fourier transformation of frequency response functions measured with stepped-sine excitation. Mode purity (based on the Phase Resonance Criterion) was generally equal to or greater than corresponding results obtained in the ground vibration tests. All identified natural frequencies and mode shapes correlate well with corresponding ground vibration test results. The modal identification approach discussed in this report has become increasingly attractive in recent years due to the steadily declining cost and increased performance of scientific computers. As illustrated in this application modern time-domain methods can be successfully applied to data acquired using DLR's existing test equipment. Some suggestions are made for future applications of time domain modal identification in this manner.

Item URL in elib:https://elib.dlr.de/39433/
Document Type:Monograph (DLR-Interner Bericht)
Additional Information: LIDO-Berichtsjahr=1991,
Title:Rigid Body Mode Identification of the PAH-2 Helicopter using the Eigensystem Realization Algorithm.
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schenk, A.UNSPECIFIEDUNSPECIFIED
Pappa, R.S.NASA, Langley, U.S.A.UNSPECIFIED
Date:1991
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:49
Status:Published
Keywords:Modal Identification, Helicopter Ground Resonance Testing, Time-domain Analysis, Consistent-Mode Indicator.
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W RP - Raumtransport
DLR - Research area:Space
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 10:43

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