Abstract
In this paper the effect of machine vibroisolation on the dynamic forces acting through bearings is investigated. An analytic solution is reached for the simple model of the rotating machine consisting of the rigid machine body and rigid rotor. These are connected by means of the bearins, and elastically jointly supported on a rigid base (foundation). It is further assumed that vibratory motion of the machine is caused by the static imbalance of its rotor. It is shown by analysis in this paper that the dynamic forces in the bearings of the vibroisolated machine are much higher, in a certain range of the input frequency rotation, than in the case of a machine with a rigid base. A design relation has been determined which satisfies the vibration isolation condition, and simultaneously decreases the dynamic load of the bearings. This can considerably increase the durability and safety of the machine.
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