Abstract
An acoustic transparent wall was developed and applied to car air conditioner ducts for the purpose of noise reduction in a car cabin. The acoustic transparent wall is a plate through which sound can pass easily but flow cannot pass. This technique has already been applied to casings and ducts of ventilating fans to reduce the inlet and/or exhaust noise. In this paper, firstly, basic experiments were performed using a test duct with the acoustic transparent wall to obtain basic design data. Secondary, this technique was tried to be applied to a car air conditioner duct, obtaining roughly lOdB, at the maximum, noise attenuation at air exits.
