Vibration and Noise
A.J. Martyr, M.A. Plint, in Engine Testing (Fourth Edition), 2012
Design of Engine Mountings and Test-Bed Foundations
The main problem in engine mounting design is that of ensuring that the motions of the engine and the forces transmitted to the surroundings, as a result of the unavoidable forces and couples briefly described above, are kept to manageable levels. In the case of vehicle engines it is sometimes the practice to make use of the same flexible mounts and the same location points as in the vehicle; this does not, however, guarantee a satisfactory solution. In the vehicle the mountings are carried on a comparatively light structure, while in the test cell they may be attached to a comparatively massive pallet or even to a seismic block. Also, in the test cell the engine may be fitted with additional equipment and various service connections. All of these factors alter the dynamics of the system when compared with the situation of the engine in service and can cause fatigue failures of both the engine support brackets and those of auxiliary devices such as the alternator. Truck diesel engines usually present less of a problem than small automotive engines, as they generally have fairly massive and well-spaced supports at the flywheel end. Stationary engines will in most cases be carried on four or more flexible mountings in a single plane at or near the horizontal centerline of the crank shaft, as in Figure 9.3.

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