Araç sürücü kabinindeki ses basınç seviyesini iyileştirmek için vibro-akusitk dizayn optimizasyon çalışması

The interior noise inside the passenger cabin of automobiles can be classified as structure-borne or airborne. In this study, we investigate the structure-borne noise, which is mainly caused by the vibrating panels enclosing the vehicle. Excitation coming from the engine causes panels to vibrate at resonance frequencies which leads to change in the sound pressure level (SPL) in the passenger cabin .Two methodologies were used to predict the SPL inside the vehicle cabin. The Finite Element Method (FEM) was used for structural analysis of the vehicle, and Boundary Element Method (BEM) was integrated with the results obtained from FEM for acoustic analysis of the cabin. The adoptedFEM-BEM approach can be utilized to predict the SPL and also to determine the contribution of each panel to interior noise. The design parameters of the most influential radiating panels (i.e., thickness) can be optimized to reduce interior noise based on performance metrics. A structured parametric study, based on techniques from the field of industrial design of experiments (DOE) was employed to understand the relationship between the design parameters and the performance metrics. A DOE study was performed for each metric to identify components that have the highest contribution to SPL and then regression models are built. Then, preliminary optimization runs are employed to improve the interior noise by finding optimum configurations for thicknesses. Our results show that the methodology developed can be used for improving the design of panels to reduce interior noise when vibro-acoustic response is chosen as performance criteria