Directional microphone array for measurement in an anechoic wind tunnel

1998 ◽  
Vol 103 (5) ◽  
pp. 2879-2879
Author(s):  
Robin J. Alfredson ◽  
Alison K. Wilson
Keyword(s):  
Wind Tunnel ◽  
Microphone Array ◽  
Directional Microphone

Directional Microphone Array for Acoustic Studies of Wind Tunnel Models

1975 ◽  
Vol 12 (3) ◽  
pp. 168-173 ◽  
Author(s):  
Paul T. Soderman ◽  
Stephen C. Noble
Keyword(s):  
Wind Tunnel ◽  
Microphone Array ◽  
Directional Microphone

Performance of a highly directional microphone array in a multi-talker reverberant environment

2013 ◽  
Author(s):  
Sylvain Favrot ◽  
Christine R. Mason ◽  
Timothy M. Streeter ◽  
Joseph G. Desloge ◽  
Gerald Kidd
Keyword(s):  
Microphone Array ◽  
Directional Microphone ◽  
Reverberant Environment

Synthetic Sound Source Generation for Acoustical Measurements in Turbomachines

2013 ◽  
Author(s):  
Michael Bartelt ◽  
Juan D. Laguna ◽  
Joerg R. Seume
Keyword(s):  
Wind Tunnel ◽  
Sound Source ◽  
Sound Propagation ◽  
Microphone Array ◽  
Sound Field ◽  
Acoustic Mode ◽  
Acoustic Excitation ◽  
Noise Emission ◽  
Noise Sources ◽  
Sound Fields

One of the greatest challenges in modern aircraft propulsion design is the reduction of the engine noise emission in order to develop quieter aircrafts. In the course of a current research project, the sound transport in low pressure turbines is investigated. For the corresponding experimental measurements, a specific acoustic excitation system is developed which can be implemented into the inlet of a turbine test rig and into an aeroacoustic wind tunnel. This allows for an acoustic mode generation and a synthesis of various sound source patterns to simulate typical turbomachinery noise sources such as rotor-stator interaction, etc. The paper presents the acoustical and technical design methodology in detail and addresses the experimental options of the system. Particular attention is paid to the design and the numerical optimization of the acoustic excitation units. To validate the sound generator during operation, measurements are performed in an aeroacoustic wind tunnel. For this purpose, an in-duct microphone array with a specific beamforming algorithm for hard-walled ducts is developed and applied to identify the source locations. The synthetically excited sound fields and the propagating acoustic modes are measured and analyzed by means of modal decomposition techniques. The measurement principles and the results are discussed in detail and it is shown that the intended sound source is produced and the intended sound field is excited. This paper shall contribute to help guide the development of excitation systems for aeroacoustic experiments to better understanding the physics of sound propagation within turbomachines.

Implementation of a Phased Microphone Array in a Closed-Section Wind Tunnel

AIAA Journal ◽  
2007 ◽  
Vol 45 (12) ◽  
pp. 2897-2909 ◽  
Author(s):  
H.-C. Shin ◽  
W. R. Graham ◽  
P. Sijtsma ◽  
C. Andreou ◽  
A. C. Faszer
Keyword(s):  
Wind Tunnel ◽  
Microphone Array

scholarly journals Microphone-Array Measurements in a Cryogenic Wind Tunnel

AIAA Journal ◽  
2010 ◽  
Vol 48 (7) ◽  
pp. 1470-1479 ◽  
Author(s):  
Thomas Ahlefeldt ◽  
Lars Koop
Keyword(s):  
Wind Tunnel ◽  
Microphone Array ◽  
Array Measurements ◽  
Cryogenic Wind Tunnel
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