円筒型遮音板の基礎的特性解析

概要

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Curving a flat panel increases its ability to sustain statical transverse loads, which suggests that in lower frequency range curved panels have superior sound insulation to flat panels. In this paper cylindrical panels are compared with flat panels on the following respects. In the first place, sound transmission properties of cylindrical and flat panels are examined by random incident transmission loss measurement. And above mentioned sound insulating properties are found below 4 kHz frequency range. Secondly, the effects of a cylindrical panel's mass and sound radiation impeadance on its sound insulation are examined. and they are found to be considerably small. Then, to consider the effect of their stiffness, cylindrical panels' natural frequencies are analyzed. Here, finite element method is expected to have suitable ability to get dynamic response to acoustic excitation of panels with various shapes and boundary conditions. In this respect planer shell element is examined to calculate natural frequencies up to 5 kHz in comparison with experiments and theoretical analysis using this method, cylindrical panels are found to have broader stiffness control zone than flat panels. And using this method sound insulating properties of cylindrical panels are expected to be analyzed in detail.
社団法人日本建築学会の論文
1985-05-30