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Analysis Methods for Ground Resonance in Partial Ground Contact

Lojewski, Reinhard and Keßler, Christoph (2021) Analysis Methods for Ground Resonance in Partial Ground Contact. In: 77th Annual Vertical Flight Society Forum and Technology Display: The Future of Vertical Flight, FORUM 2021, 77th (0050). The Vertical Flight Society. VFS International 77th Annual Forum & Technology Display, 2021-05-10 - 2021-05-14, Online. doi: 10.4050/F-0077-2021-16767. ISBN 978-171383001-6.

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Official URL: https://proceedings.vtol.org/77/html/papers.cfm#Lojewski0050


Soft-in-plane rotor systems are susceptible to a self-induced vibration phenomenon called ground resonance. This dynamic instability results from lag motions of the rotor blades coupling with airframe degrees of freedom while the helicopter is in ground contact. As an addition to previous studies of nonlinear landing gear effects, this work presents the Matrix Pencil Method as a useful additional tool for signal analysis of perturbed nonlinear systems. Contrary to simple logarithmic decrements of decaying time-series, the Matrix Pencil Method allows additional insight into the underlying structure. This makes the method interesting for ground resonance. Additionally, the Lyapunov Exponent Method is introduced to highlight and analyze nonlinear effects in helicopter substitute models.

Item URL in elib:https://elib.dlr.de/143437/
Document Type:Conference or Workshop Item (Speech)
Title:Analysis Methods for Ground Resonance in Partial Ground Contact
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Lojewski, ReinhardUNSPECIFIEDhttps://orcid.org/0000-0003-1461-0371UNSPECIFIED
Keßler, ChristophUNSPECIFIEDhttps://orcid.org/0000-0003-1565-4712UNSPECIFIED
Date:10 May 2021
Journal or Publication Title:77th Annual Vertical Flight Society Forum and Technology Display: The Future of Vertical Flight, FORUM 2021
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Publisher:The Vertical Flight Society
Series Name:Proceedings of the 77th Annual Forum
Keywords:Ground Resonance, nonlinear system, stability analysis, nonlinear stability analysis, Bodenresonanz, nichtlineare Systeme, Stabilitätsanalyse, Nichtlineare Stabilitätsanalyse
Event Title:VFS International 77th Annual Forum & Technology Display
Event Location:Online
Event Type:international Conference
Event Start Date:10 May 2021
Event End Date:14 May 2021
Organizer:Vertical Flight Society
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Efficient Vehicle
DLR - Research area:Aeronautics
DLR - Program:L EV - Efficient Vehicle
DLR - Research theme (Project):L - Virtual Rotorcraft and Validation
Location: Braunschweig
Institutes and Institutions:Institute of Flight Systems > Rotorcraft
Institute of Flight Systems > Leitungsbereich FT
Deposited By: Lojewski, Reinhard
Deposited On:01 Feb 2022 14:59
Last Modified:24 Apr 2024 20:43

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