Structural optimization of automobile upper components

In-vehicle noise is a factor that directly affects the customer's perception of quality for passenger cars. Recent research shows that modern cars focus on NVH (Noise, Vibration, Harshness). Studies reveal the importance of ceiling tiles in the control of in-vehicle noise. With the developing technology, OEM companies focused on ceiling tiles and made investments for NVH analysis. In this study, the introduction of the ceiling tiles, material properties, acoustic tests and methods of the vehicles were investigated. In this thesis, the acoustic performance of ceiling tiles was investigated. Sound absorption coefficients of ceiling tiles of different materials and different thicknesses were calculated. test results were measured by the impedance tube method.