Nonlinear Dynamics and Stability Analysis of Gas Turbine Rotor System Considering Eccentricity

摘要

According to the actual model of the gas turbine rotor system,a double-disc rotor-bearing system model is established.The appropriate parameters are selected,and the integral is solved by numerical integration method.The effects of rotational speed,unbalance and oil film thickness on the dynamics and stability of the rotor system are analyzed by combining illustration,axis trajectory and Poincare.The results show that the rotor system experiences a single cycle,and the double cycle finally enters a chaotic state;with the increase of the unbalance,the oil film stiffness is improved,and the rotor system become much more stable;and the oil film thickness is too large to increase the oil film whirl and reduce the stability of the system.If the thickness is too small,whirl and oscillation will not occur.Finally,the experiment has been performed,and the experimental results well illustrate the influence of the increase of eccentricity on the stability.