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

Weiß, Felix Armin and Keßler, Christoph (2019) Drivetrain Influence on the Lead-Lag Modes of Hingeless Helicopter Rotors. CEAS Aeronautical Journal, pp. 1-13. Springer. doi: 10.1007/s13272-019-00395-0. ISSN 1869-5590.

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Official URL: https://link.springer.com/article/10.1007/s13272-019-00395-0


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/127315/
Document Type:Article
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.dehttps://orcid.org/0000-0002-0059-7033
Keßler, ChristophChristoph.Kessler (at) dlr.dehttps://orcid.org/0000-0003-1565-4712
Date:26 April 2019
Journal or Publication Title:CEAS Aeronautical Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
DOI :10.1007/s13272-019-00395-0
Page Range:pp. 1-13
Keywords:Rotor dynamics, Lead-lag motion, Drivetrain, Coupled modes, Mode shapes, Eigenfrequencies
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), L - The Robust Rotorcraft (old), L - The Quiet und Comfortable Rotorcraft (old), L - VicToria (old)
Location: Braunschweig
Institutes and Institutions:Institute of Flight Systems > Rotorcraft
Deposited By: Weiß, Felix Armin
Deposited On:03 May 2019 11:23
Last Modified:03 May 2019 11:23

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