Avaliação da atenuação das vibrações transmitidas do motor para o chassi de um veículo Baja utilizando isoladores de vibrações

Abstract

The present work aims to reduce the transmissibility of vibrations originating from an engine used in baja vehicles. For this, engine mounts, also called engine support brackets, were selected and their dynamic stiffness was experimentally determined through bump tests. After this, a numerical analysis of the dynamic behavior of the vehicle was carried out with and without a engine mounts applied to the engine base. After this, experimental bump tests and the vehicle's vibration response were also conducted to validate the numerical analyzes and verify the reduction of vibrations transmitted to the vehicle structure. Thus, with this work, it was observed that the evaluated engine mounts was capable of providing an average reduction of 83.35% of vibrations transmitted to the chassis. It is expected that this work will assist baja teams in future pre-design stages, making it possible to obtain the physical characteristics of a engine mounts, project, allowing the development of a reliable mathematical model for carrying out modal analyzes and subsequently adjustments to the chassis and finally, validation of the results obtained during the design stage through bump tests and harmonic response on the vehicle structure.