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

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

Perception of stationary wind noise in vehicles

2021 ◽  
Vol 69 (1) ◽  
pp. 53-65
Author(s):  
Daniel Carr ◽  
Patricia Davies
Keyword(s):  
Wind Tunnel ◽  
Sound Quality ◽  
Quality Metrics ◽  
Aerodynamic Noise ◽  
Road Noise ◽  
Wind Noise ◽  
Listening Studies ◽  
Signal Modification ◽  
Made In

Predictors of people's responses to noise inside cars are used by car companies to identify and address potential noise problems from tests. Because significant improvements have been made in engine, powertrain, and tire/road noise, it is now important to pursue improvements in wind or aerodynamic noise. While models of loudness are commonly used to predict people's responses to stationary wind noise, some wind noises are less acceptable than is predicted by loudness metrics. Additional sound characteristics may account for this. Three listening studies were designed to examine the usefulness of including additional sound quality metrics with loudness in models used to predict acceptability for stationary wind-noise sounds. Test sounds were based on recordings made in cars in a wind tunnel. Signal modification techniques were developed to decorrelate metrics across a set of sounds and to examine how acceptability changes with strengths of particular sound characteristics. Models of acceptability for stationary wind noise are significantly improved when a metric that predicts the sharpness of a sound is included in the model with the loudness metric.

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.

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