Analysis of Lateral Vibration Characteristics of Rotating Shafts with Flexible and Axi-asymmetric Bearings

Abstract

A method is presented to calculate the unbalance vibration behaviours using transfer matrix method in which such factors related to the vibration are covered as the interaction characteristics of load displacement between horizontal and vertical directions at oil film bearings, the dynamic stiffness of bearing support structures, etc. In case of the rotor systems with multi-spans, the numerical accuracy is occasionally deteriorated when number of sections, number of bearings and rotating speed exceed a certain boundary as far as the conventional method is applied. The authors developed a method to suppress the propagation of the error by modifying the procedure of matrix operations and solving the simultaneous linear equations at the last step of the computation works.