Dynamic Analysis and Optimization Design of the Sfd- Sliding Bearing Flexible Rotor System

The paper proposes a mechanical model of SFD-sliding bearing flexible rotor system, employing RungeKutta method to tackle nonlinear differential equation, thus acquiring the dynamic response and the unbalanced response curve. Results obtained show the route of flexible rotor system from stable periodic motion to chaos state is: periodic motion—quasi-periodic motion—chaos —period doubling bifurcation— chaos. The paper analyzes the sensitivity of flexible rotor system, offering design variables to optimization analysis, improving the efficiency of optimization and shortening the design cycle. Based on sensitivity analysis, we conduct optimization analysis on critical speed by the application of genetic algorithm, which aims to further the enlargement of D-value between the first critical speed and the second critical speed. Additionally, the critical speed ameliorates after the optimization which supplies theoretical basis as well as theoretical analysis towards the dynamic stability of high-speed rotor system and provides reference for the design of such rotor system.