摘要
为提高航空发动机的推重比,航空发动机静子系统的工程解决方案常引起转子系统支承刚度各向异性,进而对转子系统的动力学特性产生显著影响。针对支承刚度各向异性的双转子系统,建立动力学特性计算模型,在验证计算模型准确性的基础上,研究支承刚度各向同性和各向异性对双转子系统固有频率、进动状态和不平衡响应的影响。研究结果表明:支承刚度各向同性时,双转子系统Campbell图中的低阶固有频率线出现交叉,而支承刚度各向异性使低阶固有频率线具有相互分离的趋势。支承刚度各向同性时,不平衡力仅触发转子系统的正进动运动,转子进动轨迹为圆形;而支承刚度各向异性时,转子系统的反/正进动均被不平衡力触发,转子进动轨迹为椭圆形。支承刚度各向异性时,在某些转速下转子系统不同位置处的进动方向可能不同。支承阻尼减小转子系统反/正进动的振幅及反进动的转速区间,降低支承刚度各向异性对双转子系统动力学特性的不利影响。
To improve thrust-to-weight ratio of aircraft engine,engineering solution measures for stator system often leads to the support stiffness anisotropy of the rotor system,and then have a significant impact on dynamic characteristics of the rotor system.In this work,a calculation model of dynamic characteristics of the dual-rotor system with anisotropic support stiffness is established.Based on verification of the accuracy of the calculation model,the effects of the isotropic and anisotropic support stiffness on natural frequency,whirl state and unbalance response of the dual-rotor system are studied.The results show that when the support stiffness is isotropic,the low order natural frequency lines in the Campbell diagram of the dual-rotor system cross.However,the anisotropy of the support stiffness makes the lower order natural frequency lines tend to separate from each other.For isotropic support stiffness,the unbalance force only excites forward whirl of the rotor system,and the whirl orbit of the rotor system is circular;while for anisotropic support,the unbalance force excites both forward and backward whirls of the rotor system,and the whirl orbit of the rotor system is ellipse.When the support stiffness is anisotropic,whirl direction may be different at different positions of the rotor system at some spin speeds.Support damping can reduce unbalance response amplitude of forward and backward whirls and the spin speed range of the backward whirl,and the adverse effects of support stiffness anisotropy on the dynamic characteristics of the rotor system are also weakened.
作者
李胜远
张欢
权亚旭
李兆华
王建鑫
武学安
LI Shengyuan;ZHANG Huan;QUAN Yaxu;LI Zhaohua;WANG Jianxin;WU Xuean(China North Industries Group Aviation Ammunition Research Institute Co.,Ltd.,Power Technology Department,Harbin 150036,China)
出处
《噪声与振动控制》
CSCD
北大核心
2024年第5期93-99,127,共8页
Noise and Vibration Control
关键词
振动与波
双转子系统
支承刚度各向异性
动力学特性
不平衡响应
反进动运动
vibration and wave
dual-rotor system
anisotropic support stiffness
dynamic characteristics
unbalance response
backward whirl
