Dynamic Characteristics of the Coupled System of the High PressureRotor and the Radial Driveshaft of a Turbofan Engine
In a turbofan engine,the high pressure rotor and the radial driveshaft,which transmit thepower from the internal gear-box to the external gear-box,are geared by a spiral bevel gear pair.Inthis paper,a reasonably simplified dynamic model of the coupled rotors system is established,andthen,the coupled stiffness matrix and coupled damping matrix of the spiral bevel gear pair arededuced.A shaft element method is proposed to investigate the lateral-torsional coupled vibrationequations of the gear-rotor system.Furthermore,the mode shapes and unbalance responses of thistwo rotors coupled system are simulated.The results indicate that the system derives many newmodes and the exciting forces on a rotor of the system would be passed to the other rotor for the gearsmeshing.When the rotor dynamics of a turbofan engine is being analyzed,the high pressure rotor andthe radial drive shaft must be viewed as a whole.The dynamic balance precision of the rotors shouldbe qualified properly,in order to improve the dynamic quality of the turbofan engine.
coupled rotor system shaft element method coupled matrix turbofan engine
Y.S.Fan S.M.Wang Z.Yang
School of Mechatronics,Northwestern Polytechnical University,Xian,P.R China 710072
国际会议
成都
英文
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）