Wind Tunnel Noise Measurements

1960 ◽  
Vol 32 (7) ◽  
pp. 932-932
Author(s):  
William J. Galloway
Keyword(s):  
Wind Tunnel ◽  
Noise Measurements

Airframe noise measurements in a large hard-walled closed-section wind tunnel

2019 ◽  
Vol 146 ◽  
pp. 96-107 ◽  
Author(s):  
Alessandro Di Marco ◽  
Lorenzo Burghignoli ◽  
Francesco Centracchio ◽  
Roberto Camussi ◽  
Thomas Ahlefeldt ◽  
...  
Keyword(s):  
Wind Tunnel ◽  
Airframe Noise ◽  
Noise Measurements

A transformation of the acoustic equation with implications for wind-tunnel and low-speed flight tests

1978 ◽  
Vol 363 (1713) ◽  
pp. 271-281 ◽  
Keyword(s):  
Wind Tunnel ◽  
Velocity Potential ◽  
The Body ◽  
Ordinary Wave ◽  
Flight Tests ◽  
Low Mach Number ◽  
Low Speed ◽  
Simple Effect ◽  
Acoustic Equation ◽  
Noise Measurements

This paper describes a transformation in time which reduces the equation governing the acoustic velocity potential, in a steady homentropic potential flow at low Mach number, to an ordinary wave equation. The transformation is applied when the basic flow is a uniform stream flowing past a fixed body. It is shown that, in coordinates fixed in the body, the flow has a very simple effect on the far field generated by a stationary compact sound source. This has important implications for the analysis of noise measurements from wind-tunnel and low-speed flight tests. The method can be extended to cases where the body surface is weakly vibrating.

Vehicle Wind Noise Measurements in a Wind Tunnel with a Contoured Top Profile

2016 ◽  
Vol 9 (1) ◽  
pp. 234-237 ◽  
Author(s):  
Vincent Rovedatti ◽  
Jacob Milhorn ◽  
Richard DeJong ◽  
Gordon Ebbitt
Keyword(s):  
Wind Tunnel ◽  
Wind Noise ◽  
Noise Measurements

scholarly journals Improvements of a Hard-Wall Closed Test-Section of a Subsonic Wind Tunnel for Aeroacoustic Testing

2021 ◽  
Vol 26 (3) ◽  
pp. 248-258
Author(s):  
Odenir de Almeida ◽  
Fernando M. Catalano ◽  
Lourenco Tercio Pereira
Keyword(s):  
Wind Tunnel ◽  
Test Section ◽  
Background Noise ◽  
Noise Sources ◽  
Subsonic Wind Tunnel ◽  
Array Measurements ◽  
Before And After ◽  
Noise Measurements ◽  
Low Speed Wind Tunnel ◽  
Lower Background

For achieving accurate aeroacoustic measurements to the aircraft industry, a low-speed wind tunnel, primarily designed for aerodynamic testing, is modified to provide lower background noise environment. Based on data from single microphone at different wind tunnel locations and microphone phased-array measurements inside the test-section, the main noise sources are identified and feasible alternatives are implemented for reducing the background noise such as new acoustically treated corner-vanes and sidewall lining located upstream the drive system. The acoustically transparent concept for the test-section is also investigated showing promising results for further improvements in the wind tunnel. Results are presented for sound pressure levels from single microphone measurements at different locations in the wind tunnel as well as from the beamforming array inside the test-section. Background noise measurements before and after improvements confirm that the ability of performing aeroacoustic tests has significantly increased with noise reduction of 5 dB inside the test-section.

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