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An extensive helicopter Ground Vibration Test: from pretest analysis to the study of non-linearities

Ciavarella, Christopher und Priems, Martijn und Govers, Yves und Böswald, Marc (2018) An extensive helicopter Ground Vibration Test: from pretest analysis to the study of non-linearities. In: 44th European Rotorcraft Forum 2018, ERF 2018. ERF 2018 - 44th European Rotorcraft Forum, 2018-09-18 - 2018-09-21, Delft, Niederlande.

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Kurzfassung

The Ground Vibration Test (GVT) is one of the key milestones in the characterization of an aerospace structure, allowing to describe its structural dynamic behavior. Moreover, a helicopter GVT is associated to additional challenges deriving from the rotorcraft architecture, such as a high modal density and non-linear phenomena. In this paper, these challenges are treated by presenting the extensive H145 GVT campaign carried out in June 2017 by AHD and DLR, from its conception to the first analysis of results. Starting from a H145 FE model, the pre-test analysis began with the selection of target modes from the initial numerical modes set based on modal participation and energy considerations. An optimal sensor distribution was also achieved as results of the implementation of sensor placement metrics like the Normal Displacement Method and sensor elimination methods based on MAC analysis. An extensive description of the testing methods and procedure is as well documented, from the use of a dedicated test rig to the excitation of the structure by means of several exciter constellations using different force levels in order to assess non-linear behavior and therefore identify the structural variability. After data acquisition, the efficient post-processing performed using DLR correlation tool allowed the identification of modes family and the creation of a modal model. In the first analysis of results, modal identification has shown the validity of the pre-test analysis by identifying more than 40 modes for the first helicopter configuration and exhibiting an excellent data quality. Comparison between two H/C configurations has given also a first sample of how structural variability can influence the modal layout. Furthermore, focus has been put on the identification and analysis of non-linear phenomena, proving how non-linear behavior can affect significantly the H/C dynamic response and the modal identification. Finally, a comparison between FE and test results for one H/C configuration has been performed, allowing an objective evaluation of the predictive capability of current FE models. On this basis, the path for future works in the field of FE modal updating and structural optimization is clearly defined.

elib-URL des Eintrags:https://elib.dlr.de/122998/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:An extensive helicopter Ground Vibration Test: from pretest analysis to the study of non-linearities
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Ciavarella, ChristopherDepartment of Dynamics and Vibrations, Airbus HelicoptersNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Priems, MartijnDepartment of Dynamics and Vibrations, Airbus HelicoptersNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Govers, YvesYves.Govers (at) dlr.dehttps://orcid.org/0000-0003-2236-596XNICHT SPEZIFIZIERT
Böswald, Marcmarc.boeswald (at) dlr.dehttps://orcid.org/0000-0001-8260-8623NICHT SPEZIFIZIERT
Datum:2018
Erschienen in:44th European Rotorcraft Forum 2018, ERF 2018
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:ground vibration test, helicopter
Veranstaltungstitel:ERF 2018 - 44th European Rotorcraft Forum
Veranstaltungsort:Delft, Niederlande
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:18 September 2018
Veranstaltungsende:21 September 2018
Veranstalter :NWL - The Netherlands Association of Aeronautical Engineers
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Hubschrauber
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L RR - Rotorcraft Research
DLR - Teilgebiet (Projekt, Vorhaben):L - Der leise und komfortable Drehflügler (alt)
Standort: Göttingen
Institute & Einrichtungen:Institut für Aeroelastik > Strukturdynamik und aeroelastische Systemidentifikation
Hinterlegt von: Govers, Dr.-Ing. Yves
Hinterlegt am:22 Nov 2018 09:11
Letzte Änderung:24 Apr 2024 20:26

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