Rapid dynamic load estimation procedure for lifting propellers in forward flight

  • Lifting propellers operate at oblique inflow and thus encounter severe dynamic loads during forward flight, impacting structural integrity, fatigue, and vibration. Numerical optimisation approaches consider aerodynamic, structural mechanical, and aeroacoustic aspects within preliminary design. To also account for dynamic loads during forward flight, a novel procedure allows their rapid estimation. Based on steady-state simulations combining strip theory and beam finite elements, aerodynamic excitation, damping, and stiffness are defined in the frequency domain. Loads are derived through a linear inflow model and quasi-steady aerodynamics. Damping and stiffness loads are linearised and transferred into matrix form to calculate the frequency response. The computationally expensive need for simulations in the time domain is thus avoided. Applicability extends to both fixed and variable pitch lifting propellers utilised in large multicopters for cargo or passenger transportation. Comparisons to time-marching simulations show good agreement with deviations of approximately 10%. The analytical derivation yields physical insights to understand and reduce dynamic loads and their magnification due to resonance.

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Metadaten
Author:Felix MöhrenORCiD, Ole BergmannORCiD, Frank Janser, Carsten BraunORCiD, Kai-Uwe Schröder
ISBN:978-3-932182-92-1
ISSN:0178-6326
Parent Title (English):49th European Rotorcraft Forum 2023 - Proceedings
Publisher:DGLR
Place of publication:Bonn
Document Type:Conference Proceeding
Language:English
Year of Completion:2023
Length:17 Seiten
Note:
49th European Rotorcraft Forum 2023, Bückeburg, 2023
Link:https://publikationen.dglr.de/?id=620&tx_dglrpublications_pi1[document_id]=54801037
Zugriffsart:bezahl
Institutes:FH Aachen / ECSM European Center for Sustainable Mobility
FH Aachen / Fachbereich Luft- und Raumfahrttechnik
collections:Verlag / DGLR
Licence (German): Urheberrechtlich geschützt