噪声源简化与几何发散衰减关系研究

Study on Relationship between Noise Source Simplification and Geometrical Attenuation

比较均匀矩形面声源和线声源在简化为有限长线声源和点声源几何发散衰减时,得出均匀矩形面声源在距声源较近处衰减速率要大于同等条件下有限长线声源衰减,这与声源的实际衰减原理相违背,说明了面声源与线声源在简化条件上存在不兼容。从点源的概念出发,结合线声源的简化条件,对均匀矩形面声源简化条件进行了全面的修正,使面声源、线声源和点声源在适用范围上达到了相互兼容和完整过渡。

The comparison of rectangular area sound source and line sound source in geometric divergence attenuation showed that noise attenuation rate of rectangular area sound source is greater than line sound source at the same distance from noise sources. This result goes against the principles of the law of noise attenuation and simplified model of area sound source is incom- patible with line sound source. Through an introduction of the concept of point sound source, the scope of application to noise sources is slightly modified for rectangular area sound source based on the simplified model of line sound source. The simplified mode of area sound source, line sound source and point sound source are compatible each other.