390 / 2022-02-01 06:35:21

On the reduction of the flow-induced noise generated from HVAC system in a vehicle cabin using porous materials

flow-induced noise,HVAC,Vehicle,Porous materials,Acoustic transmission loss

Acoustic metamaterials and absorbing materials

We have been developed a new idea to reduce the flow-induced noise generated from HVAC system equipped in a vehicle cabin that makes a loud noise. Porous materials whose acoustic transmission loss was relatively lower was attached to the surface of fins set at the nozzle exit of the air-flow. Experimental results showed that the flow-induced noise generated broad-banded was reduced about 3 -5 dB by attaching porous materials. Further, in our wind tunnel experiments, using these porous materials did not result in increasing of the air-flow resistance. Therefore, we can conclude that there is a possibility that our technique will become a countermeasure to reduce the flow-induced noise generated from the HVAC system.