摘要
本文利用声源辐射阻抗讨论了三维空间有源声吸收问题．推导出适用于任意初级声场条件下的多次级源最优复强度的一般表达式，并通过分析声源辐射阻抗的变化规律阐明了声吸收的机理．在此基础上，以两个点源在平面波声场中的声吸收为例，详细讨论了次级源吸收功率与两源位置的变化关系，并给出消声区域分布规律．最后在半消声室中获得了良好的实验效果，验证了所得结论．
In this paper, Active Noise Absorption(ANA)in space is discussed for arbitraryprimary acoustic field. A general formula for calculating the optimal complex strengths ofsecondary sources is derived. The physical mechanisms of ANA is explained by using a general source radiation impedance-based approach. On the basis of the discussion,the characteristics of ANA are discussed with two monopoles in primary acoustic field of plane wave as anexample. The relation between absorbed power and location of two secondary sources is discussed and the absorbed area is obtained. Finally,all theoretical results are verified by experiments carried out in a semi-anechoic room and the absorbed noise effects are satisfied.
出处
《声学学报》
EI
CSCD
北大核心
1994年第3期188-195,共8页
Acta Acustica
基金
航空科学基金
