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Drivetrain Influence on the Blade Loads of Hingeless Helicopter Rotors

Weiß, Felix Armin and Keßler, Christoph (2019) Drivetrain Influence on the Blade Loads of Hingeless Helicopter Rotors. In: Vertical Flight Society 75th Annual Forum. Vertical Flight Society. VFS 75th Annual Forum, 13.-16. Mai 2019, Philadelphia, Pennsylvania.

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Official URL: https://vtol.org/store/department/forum-75-philadelphia-pa-2019-1467.cfm


The impact of structural rotor-drivetrain interaction on the blade loads of the Bo105 helicopter is investigated by numerical simulation. For this purpose, the constraint of constant rotor hub speed is dropped and a drivetrain model, consisting of discrete inertia elements and intermediate flexible elements, is connected to the hub. The structural rotor-drivetrain system is coupled to an aerodynamic model consisting of an analytical formulation of unsteady blade element loads combined with a generalized dynamic wake. A time-marching autopilot trim of the rotor-drivetrain system in wind tunnel configuration is performed for a large blade loading flight state as well as a high advance ratio flight state. The comparison of the simulation results with those of a baseline case (constant rotor hub speed) reveals a major drivetrain influence on the blade lead-lag load harmonics at blade passage frequency. Beside the full drivetrain model, reduced models are shown to be capable of predicting the drivetrain influence on blade loads, if they yield the same eigenfrequency of the coupled rotor-drivetrain mode wRDL2 (second collective lead-lag mode couples with drivetrain) as the full model. In a sensitivity analysis, wRDL2 is varied by modification of the stiffness of a reduced drivetrain model. The resulting changes in blade loads are correlated to wRDL2, which serves as a simple but accurate classification of the drivetrain regarding its influence on vibratory blade loads. Finally, the improvement of lead-lag load prediction by the application of a drivetrain model is demonstrated through comparison of simulated loads with measurements from a wind tunnel test.

Item URL in elib:https://elib.dlr.de/128164/
Document Type:Conference or Workshop Item (Speech)
Title:Drivetrain Influence on the Blade Loads 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:May 2019
Journal or Publication Title:Vertical Flight Society 75th Annual Forum
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Publisher:Vertical Flight Society
Series Name:Proceedings of the 75th Annual Forum
Keywords:Rotor, Drivetrain, Lead-Lag Modes, Blade Loads
Event Title:VFS 75th Annual Forum
Event Location:Philadelphia, Pennsylvania
Event Type:international Conference
Event Dates:13.-16. Mai 2019
Organizer:Vertical Flight Society
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:23 Aug 2019 10:17
Last Modified:23 Aug 2019 10:17

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