Performance enhancement of an automotive silencer using acoustic metamaterial baffles

The potential for acoustic metamaterials to provide a breakthrough in sound attenuation has been unlocked recent times due advancements additive manufacturing techniques. These materials allow the targeting of specific frequencies attenuation. To date have not experimentally tested an automotive silencer performance enhancement. This study investigates effect within representative silencer. results are then compared with commonly used techniques industry gauge effectiveness metamaterials. COMSOL simulations were validate developed test rig and experimental which obtained using two-load transmission loss method. Through this testing method, implementation labyrinthine DENORMS cylinder proved be most significant improvement silencer, increase 40 dB at 1500 Hz. It was also found that traditional hard wall internal baffle can improved by replacing it baffle. Acoustic as novel method companies attenuate frequencies.