摘要
分析某双涵道变循环发动机转子系统结构特点,建立转子-支承系统三维有限元模型,计算、分析转子支承方式的改变对转子临界转速的影响。结果表明:以低压转子为主激励,转速在20000 r/min内,4支点支承比5支点支承临界转速多一阶,其中第一、三阶临界转速降低,第二阶升高,第四阶基本不变。5支点方式能有效地减少柔性低压转子弯曲振动模态出现,但是会增加低压风扇盘的上下偏摆振动模态,较易发生风扇叶片与机匣的碰磨。4支点方式结构更简单,但是转子系统在高转速时需要多经过一阶临界转速,会增加转子及整机的振动。
The structural characteristics of the rotor system of a double culvert variable cycle engine are analyzed,the three-dimensional finite element model of rotor-bearing system is established,and the influence of the change of rotor bearing method on the critical speed of rotor is calculated and analyzed.The results show that the four-bearing method,with the low-pressure rotor as the main excitation,has one more critical speed than the five-bearing method within 20000 r/min.,in which the first and third critical speeds decrease,the second increases,and the fourth basically remains unchanged.The five-bearing method can effectively reduce the occurrence of bending vibration modes of the flexible low-pressure rotor,but will increase the up and down pendulum vibration modes of the low-pressure fan disk,which is more prone to collision and friction between the fan blade and the casing.The structure of the four-bearing method is simpler,but the rotor system needs to pass through one more critical speed at high speed,which will increase the vibration of the rotor and the whole engine.
作者
陈云
臧朝平
杨志强
周煌亮
CHEN Yun;ZANG Chaoping;YANG Zhiqiang;ZHOU Huangliang(College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
出处
《机械制造与自动化》
2021年第6期148-150,共3页
Machine Building & Automation
