Calculation and Numerical analysis of a shaft amplitude Vibration

The main function of transmission system is to convert output rotary force of main engine into trust required for moving the vessel. Shaft is one of the elements of main transmission system which is composed of several sections. Shaft is influenced by pressure, bending and spiral loads. Therefore, the position of bearings and shaft designing are the major factors which reduce vibration and prevent resonance. In this paper, with various tests on two samples having the same diameter and different length, the position of bearings were studied. In accordance with the modes generated, we specified the position of bearings, so as the shaft receives less vibration. In this regard, early and precocious failure against transmission system will be removed. At the end, frequency analysis, using Abaqus software the test was done on the shaft and the results obtained, compared with the actual test.