空间有源消声的声能量流研究

Study on sound energy distribution of active noise reduction in 3D space

本文从理论和实验两个方面对平面噪声场中单极子次级源、偶极子次级源最小辐射声功率时的空间产能量流作了研究，从而直观、清晰地描述了一种消声机理：有源声吸收。并指出：尽管此时次级声源是“能量吸收”结构，但依然存在空间能量转移现象，而且并非各种类型的次级源在各个方向都吸收声能量，次级源各个方向吸收的能量大小也是不同的。实验结果与理论分析相吻合。

In this paper, theoretical and experimental studies on the sound intensity distribution ofactive noise reduction in three dimensional space when monopole and dipole secondary sources minimizetheir radiated sound energy are presented. Theoretical and experimental results point out that althoughthese secondary sources act as' energy absorption ', spatial energy shift still exists. Furthermore,sound intensity distribution varies with different secondary sources and different directions.