空间声场有源声吸收中的多极源结构

本文从声波基本方程导出了空间声场的有源声吸收能量公式,讨论了单极子,偶极子,三极子等多极次级源对初级声场的有源声吸收及相应的实现条件。在此基础上提出偶极次级源是较简单的次级源结构。在消声室的实验结果表明它具有较好的声吸收性能,为其应用作了初步的可行性研究。

Multipole source-configuration of active sound absorption (ASA) in space sound field

In this paper, the energy formulas of Active Sound Absorption (ASA) in space sound field has been derived from the basic sound wave equation, and the ASA including the relevant conditions of multipole secondary-source, such as monopole, dipole and tripole, etc., has been discussed. On the basis of the discussion, it has pointed that dipole secondary source-configuration (DAA) is the simplest attenuator. The results of experiments done in anechoic chamber have shown that DAA has effective performances which just provide the fundation and feasibility of practical use.