Host: The Japan Society of Mechanical Engineers
Name : Dynamics and Design Conference 2019
Date : August 27, 2019 - August 30, 2019
In EVs and HVs that have become widespread in recent years, there is a problem that low and medium frequency noise such as wind noise and road noise is noticeable while noise caused by the engine decreases. To this problem, double wall acoustic metamaterials are highly effective. However, due to the resonance of the middle air layer and the resonator, there are frequency ranges in which the sound insulation performance degradation, this study proposes a structure in which the bottom of the resonator is thinned. By the resonance of the membrane, sound waves of opposite phase to the noise are generated, the transmitted sound waves are canceled, and extension of the functional frequency is examined.
