A Study of Intake System Noise Transmission with PorousInsulator Using Statistical Energy Analysis

Automobile manufactures are persistently trying to enhance passenger comfort with improving different specifications such as reduction of sound level in an air intake system of motorcar engine. This work uses statistical energy analysis (SEA) to study noise transmission loss (TL) and sound pressure level (SPL) through intake system of an engine. Porous material is used at duct wall in order to reduce air resonance in the air intake duct. In addition, the effects of porous materials on noise transmission loss through duct of intake system of engine are studied. Firstly, the SEA model of simple duct is constructed in AutoSEA2 software, and then the results are compared with those of analytical model: this confirms the accuracy of this SEA model in a high frequency range. Finally, the detailed model of air intake system treated with porous materials is analyzed using AutoSEA2 software.