Active reduction of noise by additional noise source and its limit

Ken'iti Kido, Hiroshi Kanai, Masato Abe

研究成果: Conference article査読

2 被引用数 (Scopus)


This paper describes further investigations of an active noise control system in which an additional sound source is set close to the primary (noise) source. The synthesized sound radiated by the additional source is identical to that of the primary source, except in polarity. The additional and primary sources form a dipole sound source with reduced effective radiation power. In theory, the distance between these two sound sources should be less than the shortest wavelength in the required frequency range to realize an ideal dipole source. Then, the total sound pressure would be expected to attenuate in proportion to the square of the distance from the center of the sources, and little sound power would be radiated. However, in practice, the distance cannot be set small enough, so there is only a relatively small area around the dipole where the sound pressure attenuates in proportion to the square of the distance. Further afield, it attenuates in direct proportion to distance. Noise reduction is therefore limited. This paper describes the effects and the limits of performance of such a system as a function of wavelength and the dimensions of sound sources.

ジャーナルAmerican Society of Mechanical Engineers (Paper)
出版ステータスPublished - 1988 12 1
イベントPreprint - American Society of Mechanical Engineers - Chicago, IL, USA
継続期間: 1988 11 271988 12 2

ASJC Scopus subject areas

  • 機械工学


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