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Conditional Averaging of Microphone Data from HART II

Schneider, Oliver and van der Wall, Berend G. (2006) Conditional Averaging of Microphone Data from HART II. DLR-Interner Bericht. DLR-IB 111-2006/37, 22 S.

Full text not available from this repository.

Abstract

This report is related to the analysis of the HART II (Higher Harmonic Control [=HHC] Aeroacous-tic Rotor Test II) microphone data with respect to the conditional averaging method. Up to now only simple averaging of the instantaneous time histories was used, but without con-sideration of differences caused by fluctuations in rotational speed and varying vortex locations and blade vortex interactions. This so called time jitter has an important influence on the aver-aged time history since by only simple averaging the peak-to-peak magnitude is reduced and the azimuthal difference between minimum and maximum peaks is falsified. This happens even in the case of identical individual time histories in each revolution, just with a scatter in its azi-muthal location caused by fluctuations.

Item URL in elib:https://elib.dlr.de/45735/
Document Type:Monograph (DLR-Interner Bericht)
Title:Conditional Averaging of Microphone Data from HART II
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schneider, OliverUNSPECIFIEDUNSPECIFIED
van der Wall, Berend G.UNSPECIFIEDUNSPECIFIED
Date:24 November 2006
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:22
Status:Published
Keywords:HART II, Conditional Averaging, Microphone data
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:01 Feb 2007
Last Modified:27 Apr 2009 13:16

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