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The objective of this work is to do an experimental analysis of mass and stiffness (rigidity) parameters alteration and its influence in the valve train behavior. The valve train vibration contributes considerably to noise level and is related to acoustic comfort, performance and durability of the cylinder head. Three valve train configurations were used to a comparative analysis. The first configuration was the reference (base line). In the second configuration the mass of the group was increased. In the third configuration a different valve spring was used to alter the rigidity of the group. Acceleration sensors were installed in strategic positions (inside and outside) of the cylinder head to measure vibration levels in vertical and horizontal plans that permitted a comparison between the configurations results.

The vibrations related to powertrain stiffness contributes strongly to the vehicle acoustic comfort. The connection between the engine and transmission influences the vibrational powertrain behavior. The subject of this work is the numerical and experimental behavior evaluation of an powertrain vibration behavior under influence of the connection between an internal combustion engine and the transmission. Were evaluated three powertrain configurations with different levels of stiffness. The results (based on natural frequencies modes) matched the experimental evaluations at vehicle