The Application of a Porous Duct for Reducing the Intake Noise of Vehicle

자동차 흡기 소음 저감을 위한 다공질 관의 적용

Recently, the porous duct is becoming one of Possible ways to reduce the intake noise of an automobile instead of using resonators. In this article, acoustic characteristic of the porous duct is investigated theoretically and experimently. Futhermore, 4-pole parameter of the porous duct is introduced to predict transmission loss of it for various case. Acoustic efficiency of the porous duct is shown with experimental result using a car.