スピーカーの振動モードに対するエンクロージャの影響

概要

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This paper is concerned with the vibrations of a loudspeaker's mechano-acoustical part, a membrane. The dynamic behaviour of loudspeakers, one with a planar honeycomb membrane and one with a quasi-conical paper membrane is presented. An electromechanical driving system of the loudspeaker was not considered. Two experimental conditions were analysed: loudspeakers were either mounted in enclosures (a closed-box type) or they were freely suspended. The structural behaviour of loudspeakers was evaluated by means of an experimental modal analysis technique. A set of Frequency Response Functions (FRFs) was measured in the experiment and then modal parameters (modal frequencies, modal damping and mode shapes) were extracted. Modes of the planar loudspeaker were qualitatively compared with the theoretical modes of a circular plate. The structual behaviour of the quasi-conical loudspeaker was compared to the modes of a frustum of a cone. An influence of an enclosure on modal parameters of loudspeakers is descussed.
社団法人日本音響学会の論文