換気機能と遮音機能を有する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 this paper, we constructed optimal design method for multifunctional acoustic metasurface that have air vents and soundproofing function by topology optimization and inspected.

In indoor space that a person lives or works, ventilation is demanded from perspective of thermal environment. However, noise from external environment becomes a problem by establishing the through-holes such as windows on the wall. Ventilation and soundproofing are contradicting functions, but we designed the shape of the wall having the through-hole which enhanced a soundproofing function using an optimization calculation after having maintained a ventilation function. It was confirmed that the acoustic metasurface has three kinds of sound insulation methods: standing wave in the array direction , Wood's anomalous diffraction, and reflection of sound waves by the front cavity.