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

抄録

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.