Speaker
Description
Although natural ventilation apertures are installed on building façades to improve indoor air quality, they reduce the sound insulation performance of the exterior walls. One countermeasure to address this issue is installation of silencers inside the apertures. Such silencers require a compact design that is thinner than the wall thickness. In addition, the silencer should have a simple, easy to manufacture, and cost-effective structure for practical implementation. This study presents a compact silencer for natural ventilation apertures in building façades using a multi-resonator structure. Assuming an aperture with an inner diameter of 100 mm, incorporating a multi-resonator structure with a total thickness of 100 mm and an outer diameter of 200 mm achieves an insertion loss of 20 dB over a broad bandwidth around 1 kHz. This compact and simple silencer could improve sound insulation performance in the critical frequency range of human hearing. The silencer design offers a practical solution for improving indoor acoustic environments.