249 自由音場に放射される音響パワーの付加音源による低減

概要

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This paper describes a theoretical study on control of sound power radiated into a free field by the use of additional sources. A model analyzed here consists of a primary point source and π active or passive additional point sources (π=2,3,4). The primary cource radiates a pure tone with a constant volume velocity. The passive soive sources responds acoustically to the applied sound pressure radiated from the primary source. The optimal values of the volume velocity fo active sorces and the optimul values of the acoustic impedance of passive sources to minimize the total sound power radiated are derived. It is theoretically shown for all cases that the passive approach can achieve the equal reduction in sound power with an active control approach. The effects of erros in configuration of the additional sources on sound power minimization is also discussed.
一般社団法人日本機械学会の論文
2000-09-01