Istrazivanja i projektovanja za privreduJournal of Applied Engineering Science

Reduction of noise and vibration levels in sheet metal surfaces of the car body is achieved by application of different anti-vibration (damping) materials. Application of damping materials is efficient if two physical parameters, modulus and loss factor, are as high as possible. Higher modulus demands higher deformation forces during vibration, while higher loss factor and damping are better transformed into mechanical vibration energy. The results obtained by investigation of influence of several producers' material damping characteristics on vibroacoustic car body parameters are presented in this paper. The influence of materials mentioned on damping speed, sound isolation, modal parameters and internal noise of the vehicle is registered during experiments. The problem must be observed from several aspects during this research, because, material's weight, easy application and protection, dimensions and cost, must be taken into consideration along with its main function, while good ecological parameters should also be obtained.