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ACOUSTIC SCATTERING EXPERIMENTS ON SPHERES FOR STUDYING HELICOPTER NOISE SCATTERING

Yin, Jianping and Rossignol, Karl-Stephane and Bulté, Jean (2016) ACOUSTIC SCATTERING EXPERIMENTS ON SPHERES FOR STUDYING HELICOPTER NOISE SCATTERING. 42nd European Rotorcraft Forum (ERF) 2016, 5-8 September 2016, Lille, France.

Full text not available from this repository.

Abstract

This paper addresses first wind tunnel activities conducted in the GARTEUR Action Group HC/AG-24 dealing with acoustic scattering of spheres. GARTEUR Action Group HC/AG-24 is established to address noise scattering of helicopter rotors in presence of the fuselage. This test is a necessary step to help establishing an appropriate test setup for acoustic scattering of a generic GARTEUR helicopter model. The tests are conducted in the DLR Acoustic Wind Tunnel in Braunschweig (AWB). Two source systems, including both DLR Laser generated sound and ONERA SPARC (Source imPulsionnelle AeRoaCoustique), are used to perform shielding experiments. The tests include three spheres, two support systems and three wind speeds of 0m/s, 30m/s and 45m/s. The sizes of the spheres, a small one with 12cm in diameter and a big one with 34cm in diameter, are derived according to the maximum dimension of the BO105 fuselage with 12.5 scales down in both lateral- and stream-wise directions to consider that the down scaled rotor noise frequencies fit inside the effective frequency band of the noise sources. In the current paper, the analysis of the data post-processing steps required for obtaining correct spectral and time domain data for laser sound source is emphasized. The influence of the support systems on the acoustic scattering field is analyzed. The comparison of the test results with an analytical solution for sphere sound scattering is used to verify the accuracy of the experiment results. In addition, the test results can also be used as database to validate numerical tools.

Item URL in elib:https://elib.dlr.de/108081/
Document Type:Conference or Workshop Item (Speech)
Title:ACOUSTIC SCATTERING EXPERIMENTS ON SPHERES FOR STUDYING HELICOPTER NOISE SCATTERING
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Yin, JianpingJianping.Yin (at) dlr.deUNSPECIFIED
Rossignol, Karl-StephaneKarl-Stephane.Rossignol (at) dlr.deUNSPECIFIED
Bulté, JeanUNSPECIFIEDUNSPECIFIED
Date:September 2016
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:acoustic scattering test, shielding experiments,spheres, noise Propagation, analytical solution, DLR Laser generated Sound,DLR Acoustic Wind Tunnel, GARTEUR
Event Title:42nd European Rotorcraft Forum (ERF) 2016
Event Location:Lille, France
Event Type:international Conference
Event Dates:5-8 September 2016
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
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Institute of Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Yin, Dr.-Ing. Jianping
Deposited On:24 Nov 2016 15:52
Last Modified:24 Nov 2016 15:52

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