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The noise and ride behavior of a vehicle can be significantly affected by vibrations transferred from the engine through the engine mounts to the chassis. Considering the engine, engine mounts, and chassis as individual components limits the potential gains on the overall vehicle performance. By describing the engine, engine mounts, and chassis as a vibrational system, emphasis can be placed on the capacity for engine mounts to improve the vibrational characteristics of a vehicle. The focus of this paper is on the role of engine mounts in the optimization process of vehicle vibrational and acoustic behavior. Passive, semi-active, and fully active engine mount designs are discussed. Characterization of the different effects of these types of mounts on noise and vibration performance is provided based upon analytical and experimental results.

The ride and noise behavior of a vehicle is significantly affected by vibration transferred from the engine to the chassis through the engine mounts. In this paper conception and design strategies for engine mount systems based upon calculation and experimental methods are discussed. Analyses for static and dynamic engine loads and for idle shake vibrations are presented. The finite element analysis is applied to optimize a mount's rubber spring geometry. Furthermore, the role of the transfer path analysis in the optimization of an engine mount system is illustrated. Passive and semi-active engine mounts that significantly improve the isolation of the idle shake vibration will be discussed. Finally, fully active vibration absorbers which can be applied to solve noise problems, even at a late stage of a new car development program will be presented.