自由音場に放射される音響パワーの受動制御

概要

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This paper describes a fundamental study on passive control of sound power radiated into a free field. A model analyzed here consists of a primary point source and a passive additional point source. The primary source radiates a pure tone with a constant volume velocity and the additional source responds acoustically to the applied sound pressure radiated from the primary source. The relation between acoustic impedance of the passive source and the total sound power radiated is analytically obtained. The optimal values of the acoustic impedance of a passive source to minimize and to maximize the total sound power radiated are derived as functions of a product of a wavenumber and a distance between the sources. It is theoretically shown that the passive approach can achieve the equal reduction in sound power with an active control approach. The minimum and maximum values of the sound power under the condition of constant internal loss of a passive source are also derived. A sound tube is studied as an example of passive sources, and its optimal design for the minimization of the sound power is obtained.
一般社団法人日本機械学会の論文
2000-03-25