HVAC Systems and Applications! - Resources, Tools and Basic Information for Engineering and Design.
The transmission of sound through and around outdoor barriers.
Sponsored Links
If a barrier is interposed between a sound source and a receiver, part of the sound will be
The attenuation can be expressed with the help of the Fresnel number expressed as:
N = 2 d / λ (1)
where
N = Fresnel number (dimensionless)
d = A + B - d, can be calculated from the figure below (m or ft)
λ = wavelength of the sound (m or ft)
Note! The attenuation depends on the wavelength of the sound. For short waves (high frequencies) the Fresnel number limits infinitely. For higher wavelengths the Fresnel number limits to zero.
The outdoor barrier attenuation for different Fresnels number can be estimated with the diagram below.
Note! The attenuation is lower for moving sources (vehicles etc.) than stationary sources.
Sponsored Links
Difficult to find your favorite ToolBox page? Add a link to the page in your own personal Shortlist!
Translate this page to
Spanish
French
German
Italian
Dutch
Norwegian
© The HVAC ToolBox
The content in The HVAC ToolBox is copyrighted but can be used with NO WARRANTY or LIABILITY. Important information should always be double checked with alternative sources. All applicable national and local regulations and practices concerning this aspects must be strictly followed and adhered to.
We appreciate any comments and tips on how to make The HVAC ToolBox a better information source. Please contact us by email if You find any faults, inaccurate, or otherwise unacceptable information.
5 12 1
View Engineering, Design and Construction news in the absolute FREE Automatic WebSite Viewer. Engineering Breaking News!
