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