盘式拉杆转子双稳态振动特性

针对盘式拉杆转子出现的＂双稳态＂振动故障,考虑拉杆转子特殊的结构形式以及各个接触面的接触效应对转子刚度的影响,将拉杆和接触面等效为一个具有非线性刚度项的抗弯弹簧,建立了拉杆转子的运动方程.利用谐波平衡法,同时引入预测校正算法和同伦算法,对拉杆转子的振动特性进行了计算.简化模型很好地重现工程实际中出现的＂双稳态＂振动特征...

Analysis on bistable response of a disk-rod-fastening rotor

In view of the fault of bistable response appeared in the disk-rod-fastening rotor,the peculiar structure of this kind of rotor was taken into account.By considering the influence of contact effect of discontinuous interfaces on the rotor stiffness,the tie-rod and the contact surface between the wheel disks were equated to a bending resistance spring with nonlinear stiffness.Then the equation of motion of the disk-rod-fastening rotor was established according to this simplification.The vibration characteristics of rotor were calculated by the harmonic balance method with introduction of the predict-correct and homotopy arithmetics.The bistable response behaviors recurred in this simplified model were much closer to the measured results in flight.The study shows that the nonlinear factor of stiffness,resulted from the contact effect of discontinuous interfaces,was a main reason leading to the appearance of bistable response in the disk-rod-fastening rotor.The bistable region can be reduced by the way of adjusting the system parameters to some appropriate values.