Host: The Japan Society of Mechanical Engineers
Name : Dynamics and Design Conference 2021
Date : September 13, 2021 - September 17, 2021
In HEV and EV, which have become popular in recent years, noise such as 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 performance of the sound insulation 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.
