不正常
发表于 2025-3-21 17:25:01
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壕沟
发表于 2025-3-21 22:18:15
uire accurate computations of sound propagation in theatmosphere. This book describes models that can be used for thesecomputations. The models take into account complex effects of theatmosphere and the ground surface on sound waves, including theeffects of wind and temperature distributions, atmosp
辩论
发表于 2025-3-22 02:57:27
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Commonplace
发表于 2025-3-22 06:44:45
Noise barriers, propagation over a vertical screen. In Appendix 0 we describe the computational methods in more detail. Experimental results for sound propagation over barriers can be found in Refs. , , , , .
ADAGE
发表于 2025-3-22 10:57:20
Unbounded homogeneous atmosphere,he average pressure, . the variation of the pressure, is called the . or the .. A sound wave travels with a finite speed of about 340 m/s. This is experienced most clearly for sound pulses: it takes some time before a sound pulse generated by a source reaches a distant receiver.
vitreous-humor
发表于 2025-3-22 16:14:51
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vitreous-humor
发表于 2025-3-22 18:48:20
Introduction,. Sound waves are generated by a source and travel through the atmosphere to a receiver The source may be a whistling bird, as in Fig. 1.1. Other important example: of sources are cars, trains, and airplanes.
Fecundity
发表于 2025-3-22 21:13:35
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cutlery
发表于 2025-3-23 02:17:53
Atmospheric refraction,ing atmosphere is justified only for small propagation distances. For propagation distances of the order of 100 m or more, atmospheric refraction often has large effects on received sound pressure levels, in particular if the source and the receiver are close to the ground, at heights of a few meters or less.
macular-edema
发表于 2025-3-23 07:49:12
Atmospheric turbulence,d the (effective) sound speed we used smooth functions of height . These profiles should be considered as average profiles, averaged over a period of typically ten minutes.