摘要
基于有限元实体建模方法,建立了燃气轮机拉杆转子中两级叶盘系统有限元模型,分析比较了有无级间接触耦合作用下叶盘系统的模态特性,重点研究了轮盘级间接触耦合效应对叶盘系统频率转向特性的影响。研究表明,级间接触耦合作用下出现了叶盘耦合振动的复杂振动形式,振动能量不再局限于单级叶盘;级间耦合作用导致叶盘系统的频率转向特性发生改变,频率转向区内的模态不再高度密集,降低了叶盘系统对失谐的敏感度。建立了叶片刚度失谐的两级叶盘系统有限元模型并进行模态分析,结果显示失谐叶盘系统模态局部化程度较低。
The finite element model of two-stage bladed disks in gas turbine rotor was established.The modal characteristics of single and multistage bladed disks were compared.The coupling effect of interstage contact on frequency veering characteristic of bladed disk was focused on.The results show that new modes of stage-coupled vibration appear due to interstage contact coupling.The frequency veering characteristic is so modified that there appear no more highly dense modes near frequency veering region and such modification leads to a low sensitivity to mistuning for bladed disk.The modal characteristics of mistuned two-stage bladed disks were analyzed.It is verified that the extent of mode localization of mistuned bladed disk is reduced greatly.
出处
《振动与冲击》
EI
CSCD
北大核心
2011年第9期46-49,共4页
Journal of Vibration and Shock
基金
国家重点基础研究发展计划(973计划)分课题(2007CB707706)
关键词
叶盘
级间接触耦合
频率转向
失谐
模态局部化
bladed disk
interstage contact coupling
frequency veering
mistuning
mode localization
