Sound Propagation in Homogeneous Deciduous and Evergreen Woods
Sound Propagation in Homogeneous Deciduous and Evergreen Woods
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均匀落叶和常绿树林中的声音传播
DOI：
10.1121/1.2142486
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发表时间：
1963
影响因子：
2.4
通讯作者：
T. Embleton
中科院分区：
文献类型：
--
作者：
T. Embleton
在大约20个地点测量了树木引起的声音衰减（在不需要校正的大气条件下），代表了四种选定的树木类型。9000个声压级读数允许结果的平均值和标准偏差具有良好的准确性，即使按频率、树种和距源的距离--通过在每条传播路径的两端使用相同的仪器和操作员，从过量衰减值中消除仪器误差。100英尺被发现在频率低于2000 cps，与以前的工人不一致。声源在树林边缘的开阔处，观察到由于介质变化的影响，即，森林中声压级的增加以及衰减与频率的独特S形曲线。这是暗示的共振吸收，虽然根据这样的假设开发的理论，同时具有正确的频率依赖性…
The sound attenuation due to trees has been measured (under atmospheric conditions requiring no corrections) at about 20 locations, representing four selected types of woods. 9000 readings of sound‐pressure level allow good accuracy in the means and standard deviations of results even when broken down by frequency, species of tree, and distance from the source—instrumental errors are eliminated from the values of excess attenuation by the use of the same instruments and operators at both ends of each propagation path. A constant excess attenuation of 7 dB/100 ft was found at frequencies below 2000 cps, in disagreement with previous workers. With the sound source in the open at the edge of the woods, effects due to change of medium were observed, viz., an increase of sound‐pressure level in the woods and a distinctive S‐shaped curve of attenuation vs frequency. This is suggestive of resonant absorption, although a theory developed according to such a hypothesis, while having the correct frequency dependenc...