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Drivetrain Influence on the Lead-Lag Modes of Hingeless Helicopter Rotors

Weiß, Felix Armin and Keßler, Christoph (2018) Drivetrain Influence on the Lead-Lag Modes of Hingeless Helicopter Rotors. 44th European Rotorcraft Forum, 18.-21. Sep. 2018, Delft, Niederlande.

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Structural couplings between the flexible main rotor and the flexible drivetrain of the Bo105 helicopter are investigated by numerical simulation. For this purpose, the rotor hub constraint Omega = const. is dropped and a drivetrain model, consisting of discrete inertia elements and intermediate flexible elements, is connected to the hub. By use of the multibody-software SIMPACK, the coupled rotor-drivetrain system is linearized and the Eigenmodes are compared to those obtained with a constrained rotor hub. The drivetrain has a significant influence on the shapes and Eigenfrequencies of the collective lead-lag modes. While the first collective lead-lag Eigenfrequency is raised by the finite drivetrain inertia, the second is lowered due to drivetrain flexibility. To assess the influence of modeling inaccuracies on the observed couplings, the study is complemented by a sensitivity analysis. Rotor blade mass axis offset, blade pitch (causing elastic coupling) and blade precone angle have only weak influence on the coupled modes. In contrast, variations of drivetrain inertia and stiffness strongly affect the Eigenfrequencies of the coupled rotor-drivetrain modes.

Item URL in elib:https://elib.dlr.de/121871/
Document Type:Conference or Workshop Item (Speech)
Title:Drivetrain Influence on the Lead-Lag Modes of Hingeless Helicopter Rotors
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Weiß, Felix ArminFelix.Weiss (at) dlr.deUNSPECIFIED
Keßler, Christophchristoph.kessler (at) dlr.deUNSPECIFIED
Date:18 September 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:helicopter, rotor Dynamics, drivetrain, structural coupling
Event Title:44th European Rotorcraft Forum
Event Location:Delft, Niederlande
Event Type:international Conference
Event Dates:18.-21. Sep. 2018
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:rotorcraft
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Virtual Aerodynamic Rotorcraft (old)
Location: Braunschweig
Institutes and Institutions:Institute of Flight Systems > Rotorcraft
Deposited By: Weiß, Felix Armin
Deposited On:15 Oct 2018 16:31
Last Modified:15 Oct 2018 16:31

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