双转子航空发动机整机振动建模与分析  

Vibration modeling and analysis for dual-rotor aero-engine

作　　者：陈果[1] 

机构地区：[1]南京航空航天大学民航学院,江苏南京210016

出　　处：《振动工程学报》2011年第6期619-632,共14页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(50705042);航空科学基金资助项目(2007ZB52022)

摘　　要：针对实际的双转子航空发动机,建立了航空发动机双转子-支承-机匣耦合动力学模型。在耦合模型中,利用有限元方法对转子和机匣系统进行建模;支承系统采用了集总参数模型,计入了滚动轴承和挤压油膜阻尼器的非线性;定义了5种支承和连接方式,以适应复杂的双转子航空发动机转子-支承-机匣耦合系统建模。运用Newmark-β法和改进的Newmark-β法(翟方法)相结合的数值积分获取系统非线性动力学响应。最后进行了航空发动机的整机振动分析,分析了系统临界转速、应变能及不平衡响应灵敏度,研究了挤压油膜阻尼器的减振特性以及系统突加不平衡的瞬态响应。In this paper,a new dual rotor-ball bearing-stator coupling dynamic model for practical aero-engine is established.In the coupling system,the rotor and casing systems are modeled by means of the Finite Elements method;the support systems are modeled as the lumped parameter models,and the nonlinear factors of ball bearings and the squeeze film dampers are also included;5 kinds of supports and connection modes are defined to model the complex rotor-support-casing coupling system of dual rotor aero-engine.A new numerical integral method,which combines the Newmark-β method and the improved Newmark-β method（ZHAI Method）,is used to obtain the system responses.Finally,the vibration is analysis for whole aero-engine carried out,the system critical rotating speeds,strain energy,and the sensitivity of unbalance response are analyzed;the vibration suppression characteristics of squeeze film damper（SFD） and the transient responses of sudden unbalance are studied.

关 键 词：航空发动机 双转子 整机振动 有限元 耦合动力学 

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]