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Rotor Performance Enhancement via Localized Pitch Control and its effects on hub vibrations and pitch link loads

Küfmann, Philip and Bartels, Rainer and van der Wall, Berend G. (2017) Rotor Performance Enhancement via Localized Pitch Control and its effects on hub vibrations and pitch link loads. CEAS Aeronautical Journal, 8 (1), pp. 181-196. Springer. doi: 10.1007/s13272-016-0233-0. ISSN 1869-5582.

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Official URL: http://link.springer.com/journal/13272


This paper presents an approach to enhance rotor performance and reduce vibration levels at the rotor hub by introducing local blade pitch variations at specific azimuthal locations. Two different variants of these “localized pitch control” (LPC) functions are presented and their effects both on rotor performance and vibrational loads are studied using parametric variation and subsequent numerical optimization of the respective LPC signals. The results are compared with those obtained from a conventional approach using 2/rev Higher Harmonic Control (HHC). Numerical calculations were performed using the DLR’s comprehensive rotor code S4 with a modified Beddoes inflow-model simulating an isolated hingeless rotor at an advance ratio of µ=0.382. In those simulations power reductions of up to 7.61% and 3.36% could be reached using two sets of different model rotor blades. Both for power reduction and simultaneous reduction of power and 4/rev vibrational loads, LPC performed slightly better to conventional 2/rev HHC but also resulted in higher actuation demands which have to be taken into account for real-world applications of LPC.

Item URL in elib:https://elib.dlr.de/109590/
Document Type:Article
Title:Rotor Performance Enhancement via Localized Pitch Control and its effects on hub vibrations and pitch link loads
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Küfmann, PhilipUNSPECIFIEDhttps://orcid.org/0000-0003-0932-3247UNSPECIFIED
van der Wall, Berend G.UNSPECIFIEDhttps://orcid.org/0000-0001-6144-0921UNSPECIFIED
Journal or Publication Title:CEAS Aeronautical Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 181-196
Keywords:active rotor control, Performance enhancement, helicopter rotor, Vibration reduction, pitch link loads
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 Innovative Rotorcraft (old)
Location: Braunschweig
Institutes and Institutions:Institute of Flight Systems > Rotorcraft
Deposited By: Küfmann, Philip
Deposited On:08 Mar 2017 09:03
Last Modified:21 Nov 2023 09:25

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