Investigation of sound insulations effects on acoustic behavior of automotive cavity components using Energy Statistical Analysis method

In this paper, the acoustic behavior of automotive cavity components is Investigated. For this purpose, by the aid of numerical simulation, the effects of using porous layer insulation in different parts of the cavity are studied. The numerical simulation is based on Statistical Energy Analysis; therefore, at the first stage the governing equations for the Statistical Energy Analysis are presented. Then, all internal and external components of the car body are divided into small subsystems. Herewith, the internal and external cavities of the car body have been identified. In the following, considering that the method of Statistical Energy Analysis is based on energy storage and transmission, connections between all components of the model are created. Then, with applying all the sound sources into the model, the effects of using porous materials on sound transmission loss in some of the main components of the car body, including the roof, floor and dashboard panels are investigated. The results show that using of sound insulations in different parts of the car, especially on the roof, improves the noise reduction to the cavity.