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The aim of this paper is analyzing the cracked Jeffcott with an offset disk rotor system. Mathematical modeling of a Jeffcott rotor with a crack while the depths of crack changes allows analyzing the dynamic behavior of the rotor. The effect of changing speeds has been investigated on the dynamic parameters of journal bearings (stiffness and damping) and then on Sommerfeld number. The relation of the dynamic response with the static response of rotor with cracks (dynamic load factor DLF) and with the ratio of depth crack to radius rotor has been found. The results have obtained analytically and numerically by using MATLAB and ANSYS, respectively. The results show when crack’s depths increase the DLF increases and reach to maximum when a/R = 0.8.

Investigation of cracked rotor analytically and numerically