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Conditionally Averaging of Pressure Data from HART II

Schneider, Oliver and van der Wall, Berend G. (2006) Conditionally Averaging of Pressure Data from HART II. DLR-Interner Bericht. DLR-IB 111-2006/08, 25 S.

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Abstract

Content of this report is the analysis of the HART II (Higher Harmonic Control [=HHC] Aeroacoustic Rotor Test II) blade pressure data with respect to the conditional averaging of the force coefficient normal to the chord center line, C<sub>n</sub>M<sup>2</sup>, for the three operational conditions Base Line (BL) without HHC, Minimum Noise (MN) and Minimum Vibration (MV, both with HHC). C<sub>n</sub>M<sup>2</sup> is obtained by numerical integration of the chord wise pressure distribution. Up to now simple (or ensemble) averaging of the instantaneous C<sub>n</sub>M<sup>2</sup> (or pressure values of each sensor) versus time were used, but without consideration of differences caused by fluctuations in rota-tional speed and varying vortex locations. For the low frequency content these fluctuations do not affect the averaged time history, but high frequency effects like aerodynamic loading due to blade-vortex interaction can be significantly biased by simple averaging in both peak-to-peak magnitude as well as in the time (or azimuthal) width of the event. This happens even in the case of identical individual time histories in each revolution, just with a scatter in its azimuthal location.

Item URL in elib:https://elib.dlr.de/22072/
Document Type:Monograph (DLR-Interner Bericht)
Title:Conditionally Averaging of Pressure Data from HART II
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schneider, OliverUNSPECIFIEDUNSPECIFIED
van der Wall, Berend G.UNSPECIFIEDUNSPECIFIED
Date:January 2006
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:25
Status:Published
Keywords:BVI, Conditional averaging
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Rotorcraft (old)
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Active Rotorcraft (old)
Location: Braunschweig
Institutes and Institutions:Institute of Flight Systems > Rotorcraft
Deposited By: Schneider, Oliver
Deposited On:16 Mar 2006
Last Modified:27 Apr 2009 04:57

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