空间有源消声中的次级源阵列的研究

RESEARCH ON SECONDARY SOURCE ARRAY IN ACTIVE NOISE ATTENUATION IN SPACE

采用次级源阵列实现空间有源消声，次级源阵列由单极子源组成。理论分析了要达到消声目的阵列中每个次级源的辐射强度所比须满足的条件，并分析了陈列中次级源单元之间的距离，噪声源与阵列之间的距离以及阵列中次级源的数目对消声效果的影响．数值计算结果表明，在所要消声的区域以内，声压降低了很多，在区域以外，仍有相当大的消声量。

In this paper, a secondary source array made up of monopole sources is used to cancel the noise in a given region.The optimum radiating intensity of each unit of the secondary source array, which is essential to the aim of of active noise attenuation in the given region, is shown by theoretical analysis.The influence of the space between secondary units. distance between noise source and secondary source array as well as thenumber of units in the secondary array is also discussed and illustrated in graphs. The numerical results showthat much of the sound in the given region is reduced , and outside the region there is still a great noise reduction.