含有失谐特征的叶片-转盘-转轴转子系统动态特性  

Dynamic characteristics of blades-disk-shaft rotor system with mistuned features

作　　者：李朝峰[1] 周世华[1] 任翔[1] 闻邦椿[1] 

机构地区：[1]东北大学机械工程与自动化学院,沈阳110819

出　　处：《航空动力学报》2015年第1期67-75,共9页Journal of Aerospace Power

基　　金：国家自然科学基金青年基金(51105063);中央高校基本科研业务费专项资金(N120403004;N140304002)

摘　　要：采用有限元法建立了叶片、叶片-转盘及叶片-转盘-转轴动力学模型,在结构谐调和失谐情况下,分析了不同类别的模型动力学特性,给出了不同模型的振型分布图和频率分布图.通过对比研究发现:对于叶片的特性计算考虑转盘和考虑转轴有着非常大的区别,一些模型出现严重的频率分裂和振型耦合现象.另外,由于失谐会造成叶片-转盘及叶片-转盘-转轴模型的不同类型的叶片耦合振动,也出现了振动频率的分离和集中现象,甚至导致系统模态的丢失和局部振动情况,结构失谐最终导致模态频率更为连续,这为叶片转子系统的设计带来一定困难.The finite element method was adopted to establish the dynamics model of blade and blades-disk as well as blades-disk-shaft.Based on the analysis of tuned/mistuned structure and the dynamic characteristics of model in different levels,the graphs of different modes and frequency distribution were presented.It was found that the characteristics of the blades considering disk and shaft rotor had a very big difference.Some severe separate and coupled effects mode appeared in some models.In addition,as the mistune may cause the blades-disk and blades-disk-shaft modal coupling in different vibration of blade types,the vibration frequency separation and concentration appeared,even leading to the loss of the system modal and localized vibration.The mistuned structure led to more continuous modal frequency.It thus brings some difficulties for design of the the blade rotor system.

关 键 词：叶片-转子 谐调/失谐 频率分裂 局部振动 耦合频率 

分 类 号：V232.4[航空宇航科学与技术—航空宇航推进理论与工程] O322[理学—一般力学与力学基础]