Why credible propeller noise measurements are possible in the acoustically untreated NASA Lewis 8 ft by 6 ft wind tunnel

1984 ◽  
Vol 75 (6) ◽  
pp. 1913-1914 ◽  
Author(s):  
James H. Dittmar
Keyword(s):  
Wind Tunnel ◽  
Propeller Noise ◽  
Noise Measurements

Wind Tunnel Noise Measurements

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

Extrapolation and inversion of near-field propeller noise measurements

2022 ◽  
Vol 185 ◽  
pp. 108395
Author(s):  
Yan Wu ◽  
Michael J. Kingan ◽  
Ryan S. McKay ◽  
Sung Tyaek Go ◽  
Young-min Shim
Keyword(s):  
Near Field ◽  
Propeller Noise ◽  
Noise Measurements ◽  
And Inversion

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
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