Download Acoustics of long spaces : theory and design guidance by Jian Kang PDF

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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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 ecient 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.

21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. 39. ACOUSTICS OF LONG SPACES LEWERS T. A combined beam tracing and radiant exchange computer model of room acoustics. Applied Acoustics, 1993, 38, 161ÿ178. KANG J. Sound propagation in street canyons: comparison between di€usely and geometrically re¯ecting boundaries. Journal of the Acoustical Society of America, 2000, 107, 1394ÿ1404. SIEGEL R. and HOWELL J. Thermal radiation heat transfer. Hemisphere, Washington, DC, 1981, 2nd edn.

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.

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