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Subcomponent modal tests in the H135-production line to further improve finite-element model updating: background, experimental setup and results of extensive vibration tests

Knebusch, Johannes und Soal, Keith Ian und Meier, David und Meier, Tobias und Altug, Muhittin und Dieterich, Oliver und Böswald, Marc (2024) Subcomponent modal tests in the H135-production line to further improve finite-element model updating: background, experimental setup and results of extensive vibration tests. ERF 2024 - 50th European Rotorcraft Forum, 2024-09-10 - 2024-09-13, Marseille, Frankreich.

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Kurzfassung

Helicopters are designed to be as light as possible, in order to increase flight performance, to decrease the environmental footprint and to minimize operating costs. However, lightweight structures are generally susceptible to vibrations. As a byproduct of the lift and thrust created by the main rotor, oscillatory loads are inevitably introduced into the airframe via the main rotor hub and the main gear box. This combination of light weight design and dynamic loads makes structural dynamics of the airframe a relevant topic in helicopter design. In recent years, the simulation techniques to calculate the aeromechanic forces of the rotors system have become reasonably accurate. In spite of these advances, simulation models of helicopter airframes are not yet fully capable to predict the propagation of vibrations due to the introduced forces. The finite element (FE) models used for these simulations are created during the design phase and continuously adapted during design iterations. At the end of the design phase, a prototype of the optimized design is built. Its structural dynamic characteristics are determined in a so-called shake test. The result of the shake test are experimentally determined modal parameters like eigenfrequencies, damping ratios and mode shapes which can be compared with simulation results obtained from the FE models. If the deviations between test and simulation are too large, the FE models must be adapted to reality. However, a complete helicopter is an intricate system and the possible sources of modelling errors in the FE models can be numerous. Therefore, this goal is difficult to achieve. Due to this known limitation, Airbus Helicopters and DLR jointly developed a new approach for the improvement of dynamic models of helicopter fuselage. The key idea is to perform subcomponent modal tests on a successively built serial production helicopter in the assembly line. These tests took place during normal manufacturing operations in the production line and are used to validate the respective subcomponents in the FE model. As an outcome of this validation process, poor modeling assumptions can be identified and an accurate simulation model of the entire helicopter can be synthesized. In order to proof the feasibility of this approach, an extensive measurement campaign was conducted on an H135 in the assembly line at Airbus Helicopters Germany in 2022. In the process, modal tests were performed on the successively assembled helicopter at 10 production stations. This publication is intended to show the experimental setup, as well as results of this extensive modal test campaign. Even though the approach was demonstrated to be feasible and effective on a well-established helicopter model (i.e. H135), it was developed for application on future helicopter developments.

elib-URL des Eintrags:https://elib.dlr.de/206563/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Subcomponent modal tests in the H135-production line to further improve finite-element model updating: background, experimental setup and results of extensive vibration tests
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Knebusch, JohannesJohannes.Knebusch (at) dlr.dehttps://orcid.org/0000-0001-9180-9638NICHT SPEZIFIZIERT
Soal, Keith IanKeith.Soal (at) dlr.dehttps://orcid.org/0000-0002-5132-6823NICHT SPEZIFIZIERT
Meier, Daviddavid.meier (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Meier, TobiasTobias.Meier (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Altug, MuhittinAIRBUS HelicoptersNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Dieterich, OliverAIRBUS HelicoptersNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Böswald, MarcMarc.Boeswald (at) dlr.dehttps://orcid.org/0000-0001-8260-8623NICHT SPEZIFIZIERT
Datum:2024
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:akzeptierter Beitrag
Stichwörter:Helicopters, assembly line, subcomponent modal tests, shake test, vibration, validation, extensive test campaign, finite element, model updating, fe
Veranstaltungstitel:ERF 2024 - 50th European Rotorcraft Forum
Veranstaltungsort:Marseille, Frankreich
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:10 September 2024
Veranstaltungsende:13 September 2024
Veranstalter :Association aéronautique et astronautique de France (3AF)
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Effizientes Luftfahrzeug
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L EV - Effizientes Luftfahrzeug
DLR - Teilgebiet (Projekt, Vorhaben):L - Virtueller Hubschrauber und Validierung
Standort: Göttingen
Institute & Einrichtungen:Institut für Aeroelastik > Strukturdynamik und Systemidentifikation
Hinterlegt von: Knebusch, Johannes
Hinterlegt am:19 Sep 2024 20:36
Letzte Änderung:19 Sep 2024 20:36

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