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Using Multibody Dynamics for the Stability Assessment of a New Double-Swept Rotor Blade Setup

Arnold, Jürgen and Waitz, Stefan (2018) Using Multibody Dynamics for the Stability Assessment of a New Double-Swept Rotor Blade Setup. In: 44th European Rotorcraft Forum 2018, ERF 2018. ERF 2018 - 44th European Rotorcraft Forum, 17.-20. Sep. 2018, Delft, Niederlande.

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A new double-swept rotor blade setup has been assessed in frequency domain for both, dynamic stability in terms of ground resonance and aeroelastic stability related to rotor blade and rotor flutter. The blade setup is being developed for a rotor test rig and will be operated under axial inflow. Methodology is based on a multibody system which is coupled with an unsteady aerodynamic model based on Wagner’s function and related enhancements for the general motion of an airfoil section considering heave and pitch motion. The simulation model uses modelling techniques for the setup of a linearized model and allows both, the investigation of ground resonance and flutter for the rig with clamped and articulated rotor blades in frequency domain. Numerical results for the two- and four-bladed rotor state dynamic stability for the setup with clamped blades within the planned rotor speed range up to 65 Hz, whilst the setup using articulated blades with lead-lag hinges indicates instability at low scale starting from a rotor frequency of 30 Hz. The aeroelastic assessment shows a small hump in the damping curves for the two-bladed rotor which is found instable at rotor speeds around 20 Hz for both rotor setups. Here, the flutter mechanism has major contributions from the backward whirl mode and flap bending modes. In contrast, the four-bladed rotor configurations do not show flutter.

Item URL in elib:https://elib.dlr.de/124827/
Document Type:Conference or Workshop Item (Speech)
Title:Using Multibody Dynamics for the Stability Assessment of a New Double-Swept Rotor Blade Setup
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Arnold, JürgenUNSPECIFIEDhttps://orcid.org/0000-0002-1751-7458UNSPECIFIED
Date:September 2018
Journal or Publication Title:44th European Rotorcraft Forum 2018, ERF 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Aeroelastik, Rotor Whirl, Bodenresonanz, Flatterstabilität, RTG
Event Title:ERF 2018 - 44th European Rotorcraft Forum
Event Location:Delft, Niederlande
Event Type:international Conference
Event Dates:17.-20. Sep. 2018
Organizer:NWL - The Netherlands Association of Aeronautical Engineers
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 Quiet und Comfortable Rotorcraft (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Simulation
Deposited By: Arnold, Dipl.-Ing. Jürgen
Deposited On:09 Jan 2019 16:56
Last Modified:23 Feb 2022 12:20

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