Many engineers and designers in the automotive industry would like to determine a reasonable powertrain mounting system which meets a list of static and dynamic performance requirements, the design of which is limited by many factors. One of the approaches is to adopt a decoupling arrangement between powertrain rigid-body modes and to control frequencies in the main vibration directions of the powertrain so they fall within a desirable range. This is done by optimising stiffness, location and orientation of mounts.