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This literature review is part of a PhD. project which is being carried out under the supervision of the second one, at UFSC/Brazil and ISVR/UK of the first author. The principal excitation sources for the internal combustion engine is presented, together with the methods used for identification and quantification of piston slap excitation sources.

The boundary conditions of the inner vehicle compartment, such as sound absorption of the lining materials and panel vibrations have a considerable influence in the acoustic comfort of the passengers and driver. The numerical simulation of the irregular cabin with the finite element method (FEM) and/or the boundary element method (BEM) have a great advantages in the modeling of the acoustic energy injected and/or absorbed by the inner cabin surfaces. In this paper, a numerical modeling of a vehicle cabin is presented by FEM and BEM. The panel vibration, between the engine compartment and passenger compartment was considered as the noise source. Prediction of the sound pressure level generated at the driver ear position was calculated for different absorption materials at the roof. This model allows optimization of the lining material and investigates the effect of panel vibration, leakage due to gaps and holes and also cabin geometry.

This work presents a study on dynamics of homocinetic half-shaft with constant velocity joints using experimental modal analysis. It shows the development of a test rig that allows a representative simulation of the dynamic conditions imposed by the vehicle to the component concerning its first bending mode. This equipment allows a precise adjustment of the test parameters and increases the repetitiousness of the results comparing to the results obtained using the vehicle, but the main advantage is the possibility of executing experimental test before the vehicle prototype manufacture. The implementation of this test rig is discussed and its validation against vehicle data obtained experimentally is shown.