In analysis of natural frequencies and mode shapes of car cabin we shall investigate principle of measured values, we shall describe diferencies between analytic and FEM solution of simplified inside space. In next case we shall compute frequencies and mode shapes of sound inside car cabin of four different body and option of interference by one of them.

The diploma thesis focuses on the analysis of the internal acoustics of a tractor using the finite element method. The thesis also contains the analysis of excitation effects from individual sources of vibrations and evaluating the response in the internal acoustic chamber with special focus on the driver’s head. The conclusion should suggest appropriate structural modifications to reduce interior noise.