By Jian Kang
Acoustics is a big trouble in lots of lengthy areas, corresponding to highway or railway tunnels, underground/railway stations, corridors, concourses and concrete streets. the explicit difficulties of such irregularly formed areas, starting from noise toxins in streets and tunnels to terrible speech intelligibility of public handle platforms in railway stations usually are not handled via vintage room acoustic theory.
This cutting-edge exposition of acoustics of lengthy areas offers the basics of acoustic idea and calculation formulae for lengthy areas in addition to giving guidance for sensible layout
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Additional resources for Acoustics of long spaces : theory and design guidance
And SéRSDAL S. Calculating the acoustical room response by use of a ray tracing technique. Journal of Sound and Vibration, 1968, 8, 118ÿ125. BORISH J. Extension of the image model to arbitrary polyhedra. Journal of the Acoustical Society of America, 1984, 75, 1827ÿ1836. LEE H. and LEE B. An ecient algorithm for image method technology. Applied Acoustics, 1988, 24, 87ÿ115. KULOWSKI A. Algorithmic representation of the ray tracing technique. Applied Acoustics, 1984, 18, 449ÿ469. LEHNERT H. Systematic errors of the ray-tracing algorithm.
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Multiple re¯ections are achieved by considering further images of the image source. At each re¯ection the strength of the image source is reduced due to the surface absorption. With the image source method the situation of a source in an enclosure is replaced by a set of mirror sources in a free ®eld visible from the receiver considered. The acoustic indices at the receiver are determined by summing the contribution from all the image sources. A disadvantage of the image source method is that it slows exponentially with increasing orders of re¯ection as the number of images increases.