elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Numerical Simulation of Landing Gear Dynamics: State-of-the-art and Recent Developments

Krüger, Wolf and Morandi, Marco (2008) Numerical Simulation of Landing Gear Dynamics: State-of-the-art and Recent Developments. In: Proceedings - AVT-152 Symposium on Limit Cycle Oscillation and Other Amplitude-Limited Self-Excited Vibrations. AVT-152 Symposium on Limit Cycle Oscillation and Other Amplitude-Limited Self-Excited Vibrations, 2008-05-05 - 2008-05-08, Loen, Norway [Europe].

Full text not available from this repository.

Abstract

Aircraft landing gears support the aircraft during ground operations, including take-off, landing impact, taxiing, gate handling and maintenance. Mostly for reasons of minimum mass and ground clearance, landing gears are slender structures which exhibit a considerable dynamic response to ground load excitiations. As the landing gear is one of the few systems on the aircraft without redundancies, the knowledge of landing gear dynamics is crucial for aircraft design and aircraft safety. Simulation of landing gear dynamics is a cornerstone of aircraft loads analysis, as well for vertical loads resulting from touch-down as for longitudinal and lateral loads resulting from braking, steering and towing. Another important field of interest are landing gear vibrations like gear walk and shimmy. Those phenomena can be brake induced or result from tire spin up at touch-down or simply from a coupling of dynamics of the running tire and structural mechanics of the landing gear leg. All those effects strongly depend on a number of parameters such as aircraft speed, landing gear vertical deflection, tire pressure and wear of the parts. Many of those parameters can only be estimated and might change during the operation of the aircraft. Numerical investigation is thus a challenging task. Analysis methods exist both in the frequency domain and in the time domain. As stability analysis is straight forward in frequency domain methods, this approach is still often used. However, in many cases non-linearities are dominant which lead to limitcycle characteristics of the vibrations. Here, multibody modelling or a mixture of multibody and finite element modelling including time domain simulation is used. In the paper, a general outline is given of how vibration problems in landing gears can be treated by numerical analysis methods. The paper will start with a classification of typical problems, give a short overview of classical papers, and explain typical approaches. In addition, alternative approaches for stability analysis and for the detection of LCOs as well as state-olf-the-art modelling approaches will be presented.

Item URL in elib:https://elib.dlr.de/54423/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Numerical Simulation of Landing Gear Dynamics: State-of-the-art and Recent Developments
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Krüger, WolfUNSPECIFIEDUNSPECIFIED
Morandi, MarcoPolitecnico Di Milano, Dipartimento di Ingegneria AerospazialeUNSPECIFIED
Date:2008
Journal or Publication Title:Proceedings - AVT-152 Symposium on Limit Cycle Oscillation and Other Amplitude-Limited Self-Excited Vibrations
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:aircraft, landing gear, LCO
Event Title:AVT-152 Symposium on Limit Cycle Oscillation and Other Amplitude-Limited Self-Excited Vibrations
Event Location:Loen, Norway [Europe]
Event Type:international Conference
Event Dates:2008-05-05 - 2008-05-08
Organizer:NATO RTO
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flexible Aircraft (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Deposited By: Erdmann, Daniela
Deposited On:30 Jun 2008
Last Modified:27 Apr 2009 15:01

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.