Analytical and Numerical Investigation to the Effect of Two Cracks on the Dynamic Behavior of Rotor-Bearings System
The dynamic behavior of a Jeffcott with an offset disk rotor system with a slant crack under variation of slant angle of the crack is investigated. Assuming that the Jeffcott with an offset disk supported by journal bearings occurs in it two transverse cracks on each side of disk for some reason. The simulation of a Jeffcott model has been done by using the theory of fracture mechanics for rotor shafts with two cracks with changing the depths of two cracks. The depth of the two cracks variations as well as the slant angle for the first crack was determined. The results indicate the increasing response amplitude and decrease in critical speed by increasing the crack angle from 30◦ to 90◦. The results were analyzed analytically and numerically by using MATLAB and ANSYS, respectively.