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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, we study the space-generated energy flow of the monopole secondary source and the dipole secondary source in the plane noise field from two aspects of theory and experiment, so as to intuitively and clearly describe a kind of energy consumption Sound mechanism: active acoustic absorption. It is pointed out that although the secondary sound source is an “energy absorbing” structure at this time, the spatial energy transfer still exists, and not all types of secondary sources absorb the sound energy in all directions, and the energy absorbed by the secondary sources in all directions The size is different. The experimental results are consistent with the theoretical analysis.