通風機能と遮音機能を併せ持つ音響メタサーフェスのトポロジー最適化と効果検証

摘要

Topology optimization for the design of acoustic metasurface having ventilation and sound insulation function In the indoor space that a person lives or works, a ventilation function is demanded from the perspective of thermal environment. However, the noise from the external environment becomes the problem by establishing the through-holes such as windows on the wall to have a ventilation function. In late years studies of acoustic metasurface which is controllable by the sound wave such as soundproofing and the acoustic absorption function are accomplished. A ventilation function and a soundproofing function were contradicting functions, but a study of acoustic metasurface which balanced a soundproofing function with a ventilation function has been accomplished. Based on the study, We designed acoustic metasurface of the wall having the through-hole which enhanced a soundproofing function and a ventilation function by an Topological optimization. This paper describes the shape of the acoustic metasurface and the inspection result of an experimental noise reduction effect.%人が居住もしくは作業する室內空間において，換気や温度調整のために通風機能が求められる.通風機能を持たせるため，壁に窓などの貫通孔を設置することにより，外部環境からの騒音が問題となることがある.近年，防音機能や吸音機能を持った音波を制御可能な音響メタサーフェスの研究がなされており，通風機能を維持した上で，防音機能を高める貫通孔を有する壁の設計手法が提案されている本研究では文献に基づいて設計した音響メタサーフェスの騒音低減効果を実験的に検証する.