支承非线性特性对双转子系统的响应特性影响研究  

Impacts of support′s nonlinear characteristics on response characteristics of dual-rotor system

作　　者：杨喜关[1] 罗贵火[1] 温卫东[1] 唐振寰[1] 王飞[1] 

机构地区：[1]南京航空航天大学能源与动力学院,江苏南京210016

出　　处：《振动工程学报》2014年第4期572-582,共11页Journal of Vibration Engineering

摘　　要：以双转子试验器为研究对象,开展高维复杂双转子系统的建模方法和动力特性的研究。将双转子系统划分为模态子结构和连接子结构,利用有限元方法和固定界面模态综合进行模态子结构的建模及维数缩减,将连接子结构保留在物理空间中,通过界面对接条件实现子结构的组装,利用Newmark法进行含局部非线性的双转子系统运动方程的数值求解。进行了计算模型的试验验证,并研究了转子系统的响应规律。研究结果表明:随转速的变化,转子响应中出现了滚动轴承的变刚度振动频率、不平衡激励频率及相关组合频率;同步不平衡响应的变化规律与支承位置、转子各轮盘的不平衡量及临界振型有着密切的联系。Researches on modeling method and dynamic characteristics of complex dual rotor system are carried out with a dual rotor experimental apparatus. The dual rotor system is divided into modal substructure and connecting substructure. Then, with finite element method and fixed interface modal synthesis method, modeling and dimensionality reduction of the modal substructure are conducted, and the connecting substructure is retained in the physical space. The substructures are assembled according to the butt conditions between supports and shaft. And then the dynamic equation of the dual rotor system with local nonlinear is solved using the Newmark algorithm. Validity of this method is verified by experimental resuhs, and the rotor system response law is studied. The researches show that： with rotational speed changing, unbalanced response frequency and variable-stiffness vibration frequency of the roiling bearing and the combination of these frequencies emerge in the rotor response; law of unbalanced synchronous response has close relationship with supports＇ position,unbalance of the rotor discs and the mode shapes of critical speeds.

关 键 词：航空发动机 双转子系统 非线性振动 模态综合法 连接子结构 

分 类 号：V231.96[航空宇航科学与技术—航空宇航推进理论与工程]