レゾネータとメンブレンを用いた二重璧音響メタマテリアルによる音響透過損失向上検討

抄録

HEV and EV become popular in recent years. Road noise which used to be masked by the noise from the engine is relatively conspicuous and prevents the improvement of interior quietness.Improvement of the sound insulation performance can be achieved by increasing the mass or volume of the sound insulation, but this must be avoided in order to reduce the weight of the vehicle. Double-wall structure with an air layer between the walls is a method to improve the sound insulation performance without increasing the thickness or mass of the sound insulating material, but there is a problem of resonant transmission, in which sound penetrates at a certain frequency due to resonance in the intermediate air layer. In this study, we investigate the improvement of the sound insulation performance by suppressing the resonant transmission of the double-walled structure with acoustic metamaterials.