Vibration of a Misaligned Rotor System with Asymmetric Shaft Stiffness

Abstract

Vibration characteristics of a misaligned rotor with asymmetric shaft stiffness are studied. The system consists of two shafts connected by a flexible coupling with parallel misalignment, two rigid disks attached at the middle of each shaft and one of the shafts has asymmetric stiffness. The governing ordinary differential equations are derived using Lagrange dynamics and integrated through numerical methods. The effects of asymmetry, eccentricity and misalignment are studied through the peak-to-peak lateral vibration amplitude at different rotor speed. Simulation results show that the amplitude peaks at the natural frequency associated with unbalance and parallel misalignment, while half the natural frequency associated with the asymmetric shaft stiffness. This study may contribute to enrich understanding of the vibration of a rotor system under the cases of eccentricity, parallel misalignment and asymmetric shaft stiffness.

Vibration Behavior of Misaligned Rotor with the Asymmetric Shaft Using Theory of Timoshenko Beam

“…Feng et al [25] investigated the vibration behavior of an asymmetric rotor under misalignment force. They observed that the maximum amplitude occurs near half of the natural frequency , as a result of asymmetry in the shaft, while the dominant frequency can be seen near when subject to parallel misalignment.…”