Parameterization Modeling And Dynamic Characteristics Optimization Of A Dual-rotor System

The design has an attractive prospect for a military aero-engine with a four-support dual-rotor system and intermediate bearing, but the austere challenging was brought for the rotor-dynamics design and optimization. The main achievements are as followings:(1) The modeling platform was developed for dual-rotor making use of UG, ANSYS software and VB Language. The parametric dynamic characteristic modeling was achieved and analysis efficiency was improved for dual-rotor system with intermediate bearing by extracting the structure geometric parameters of the disk and axis.(2) The influence was researched for support characteristics on critical speeds basing on the parametric dual-rotor system model established by finite element; The critical speeds was respectively analyzed under the value of static stiffness, simulating dynamic stiffness and testing stiffness, it was shown that the maximal critical speeds corresponded to testing stiffness, the middle to simulating dynamic stiffness and the minimum to static stiffness; The influence was studied for support damper on the rotor-dynamic characteristics, it was shown that the support damping reduced vibration obviously and led to increase the critical speeds slightly. The results supplied reference for dynamic characteristics design and analysis of the four-support dual-rotor system.(3) The dynamic characteristics were analyzed for dual rotor system transfer with matrix method, the critical speeds, vibrational modes, unbalance response were achieved, and the creditability was verified for the results. It supplied reference for dynamic characteristics design and analysis of the four-support dual-rotor system.(4) The critical speeds were calculated for the dual-rotor system with direct method making use of Matlab FE routines programed independently. The dynamic characteristics of the critical speeds were optimized with genetic algorithm for the rotor system basing on the dynamic model. The critical speeds could be calculated and optimized rapidly with the routines.(5) Experiments were researched for the dynamic characteristics of dual rotor system, the results of Ansys, the transfer matrix method and the direct(FE) method were verified with the experiments. It was shown that the critical speeds under testing stiffness were the closest to test value for the dual rotor system.