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 dat a. Secondly, the simulation results of acoustic analysis were verified by compared with the measured results. The simulation results agree with the measured results except some frequency ranges.
