Detection of turbulence aloft by infrasonic wind noise measurements on the ground

Jericho Cain; Richard Raspet

doi:10.1121/1.3654775

Wind-noise measurements on an automobile side glass with A-pillars of different height

10.2514/6.1996-879 ◽

1996 ◽

Cited By ~ 4

Author(s):

T. Hamel ◽

K. Ahuja

Keyword(s):

Wind Noise ◽

Noise Measurements

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

SAE International Journal of Passenger Cars - Mechanical Systems ◽

10.4271/2016-01-1316 ◽

2016 ◽

Vol 9 (1) ◽

pp. 234-237 ◽

Cited By ~ 2

Author(s):

Vincent Rovedatti ◽

Jacob Milhorn ◽

Richard DeJong ◽

Gordon Ebbitt

Keyword(s):

Wind Tunnel ◽

Wind Noise ◽

Noise Measurements

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Statistical Analysis of Correlation Between Simulation and Measurement of Interior Wind Noise

ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting: Volume 1, Symposia – Parts A, B, and C ◽

10.1115/fedsm-icnmm2010-31050 ◽

2010 ◽

Cited By ~ 5

Author(s):

Robert E. Powell ◽

Sivapalan Senthooran ◽

David M. Freed

Keyword(s):

Statistical Analysis ◽

Energy Analysis ◽

Flow Simulation ◽

Correlation Study ◽

Acoustic Response ◽

Passenger Vehicle ◽

Wind Noise ◽

Reduction Techniques ◽

Noise Measurements ◽

Aeroacoustic Simulation

Aeroacoustic simulation with CFD (Computational Fluid Dynamics) generates large result datasets that need to be analyzed carefully to correlate with interior wind noise measurements. Recently, a new tool has been developed that simulates interior noise from exterior air flow by combining transient CFD for flow simulation and SEA (Statistical Energy Analysis) for vehicle structural acoustic response. Several interesting data reduction techniques have been employed to correlate dozens of separate passenger vehicle tests with the corresponding simulation results. This paper presents results of this correlation study, including statistical analysis of the resulting frequency domain comparison.

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Analysis of wind noise measurements

The Journal of the Acoustical Society of America ◽

10.1121/1.2029653 ◽

1991 ◽

Vol 89 (4B) ◽

pp. 1953-1953

Author(s):

Scott Morgan ◽

Richard Raspet

Keyword(s):

Wind Noise ◽

Noise Measurements

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Wind Noise Measurements for Automotive Mirrors

SAE International Journal of Passenger Cars - Mechanical Systems ◽

10.4271/2009-01-0184 ◽

2009 ◽

Vol 2 (1) ◽

pp. 419-433 ◽

Cited By ~ 8

Author(s):

Kuo-Huey Chen ◽

Jim Johnson ◽

Urs Dietschi ◽

Bahram Khalighi

Keyword(s):

Wind Noise ◽

Noise Measurements

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Wind turbines noise measurements inside homes

Building Acoustics ◽

10.1177/1351010x18792884 ◽

2018 ◽

Vol 25 (4) ◽

pp. 339-350

Author(s):

Gino Iannace

Keyword(s):

Wind Velocity ◽

Wind Farm ◽

Wind Farms ◽

Weather Conditions ◽

Sound Level ◽

Rapid Expansion ◽

Wind Noise ◽

Wind Speeds ◽

Sound Levels ◽

Noise Measurements

The rapid expansion of energy produced by wind power has increased the interest in the possible harmful effects on the health of the residents in the areas near to wind farms. It is therefore important to understand how to reduce these effects. This article analyses the results of noise measurements carried out in homes located near a wind farm in Southern Italy. Two sound level metres for the contemporary acquisitions of noise levels were used, placed in two different homes: three wind towers were visible from one measurement point, while only one wind tower could be seen from the other point. The acoustic measurements were performed under different weather conditions as well as with different wind speeds and directions. The same conditions were measured when the system was on and off. The measured sound levels were then compared so as to establish the wind velocity ranges where the part of noise generated by the rotating of the blades (ambient noise) prevails as well as the wind velocity ranges where the wind noise (background noise) prevails. The analysis of the data shows how for low wind speeds, the noise generated by the rotating of the blades is considered an annoyance by the people who live near the farm. While for greater wind speeds, the noise generated by the rotation of the blades is covered by the noise of the wind, with it therefore not being perceived.

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Wind Noise and Motorcycle Crash Helmets

Journal of Low Frequency Noise Vibration and Active Control ◽

10.1177/026309239401300202 ◽

1994 ◽

Vol 13 (2) ◽

pp. 49-57 ◽

Cited By ~ 3

Author(s):

A.W. Mccombe ◽

J.A. Binnington ◽

D. Nash

Keyword(s):

Low Frequency ◽

Sound Attenuation ◽

Wind Noise ◽

Vehicle Noise ◽

Sound Levels ◽

Rate Of Increase ◽

Noise Measurements ◽

Motorcycle Helmets ◽

Crash Helmet ◽

Attenuation Characteristics

An investigation was undertaken into the source and levels of wind noise in motorcycle helmets, and their sound attenuation characteristics. All noise measurements increased in a linear fashion when plotted against log10 speed. Low frequency wind noise displayed a greater rate of increase than vehicle noise and surpassed it and the recommended 8 hour occupational maximum of 90dB(A) at approximately 17m/s (40mph/68kph) to reach levels of 111dB(A) at 44m/s (100mph/170kph). There were no statistical differences in the sound levels for different motorcycles, riding position or helmet fit. There were small but significant differences between helmet types. A wind tunnel analysis indicates a turbulent boundary layer as the sound source. As currently designed, a typical motorcycle crash helmet provides no useful sound attenuation below 2000 Hertz and thus little protection against the damaging effects of wind noise. It is suggested that improvements in helmet attenuation characteristics would go some way to addressing this problem.

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