Workable mode optimization design method for dual-rotor system with inter-shaft bearing
In order to solve the problem that the dual-rotor system of aero-engine cannot avoid the critical speed,a model of dual-rotor system with inter-shaft bearing was established.Considering the influence of unbalance sensitivity,damper effect and the load effect of inter-shaft bearing,the tolerability evaluation functions of low-pressure and high-pressure rotor excited modes were constructed,the tolerability objective function and the constraint condition for optimization design on workable mode of dual-rotor were confirmed,and the optimization design method for the workable mode of dual-rotor system with inter-shaft bearing was established.It was found that compared with the traditional critical speed margin design criterion,the maximum amplitude of the disk of the dual-rotor system with inter-shaft bearing was reduced by 39.83％,the total mass of the shafting was reduced by 2.32％,and the external force of the fulcrum was reduced by 64.98％by using the optimization design method for the workable mode,indicating that the optimization design method for the workable mode of dual-rotor system with inter-shaft bearing was effective.
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