A literature review of automotive vehicle engine mounting systems

The ideal engine mount system should isolate engine vibration caused by engine disturbance force in engine speed range and prevent engine bounce from shock excitation. This implies that the dynamic stiffness and damping of the engine mount should be frequency- and amplitude-dependent. The development of engine mounting systems has mostly concentrated on improvement of frequency- and amplitude-dependent properties. The conventional elastomeric mounts do not meet all the requirements and can only offer a trade-off between static deflection and vibration isolation. Passive hydraulic mounts can provide a better performance than elastomeric mounts especially in the low frequency range. Semi-active techniques are usually used to further improve performance of hydraulic mounts by making them more tunable. The active engine mounting system can be very stiff at low frequency and be tuned to be very soft at the higher frequency range to isolate the vibration. The active engine mounts have been considered as the next generation of engine mounts. The optimization of engine mounting systems is quite desirable. The current work on the optimization of the engine mount systems shows some limitations.