Abstract
The critical speed of a shaft rotating in water differs from that in vacuum. This is due to the hydrodynamical force generated by the eccentric rotation of the shaft. So, to analyse this problem, these fluid motions must be investigated. In this report, these fluid motions are approximately calculated and the hydrodynamical force is derived. Furthermore, the experiments are made and compared with the calculations. They coincide with each other very well. Also, the attached moments of inertia are calculated.
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