Optimum design of an acoustic metasurface having ventilation and soundproofing function

Abstract

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.