文献类型：期刊文献

中文题名：直斜裂纹转轴的时变刚度特性研究

英文题名：Time-varying stiffness characteristics of rotating shaft with transverse and slant crack

作者：刘长利[1];李诚[2];周邵萍[1];夏春明[1]

机构：[1]华东理工大学机械与动力工程学院承压系统安全科学教育部重点实验室,上海200237;[2]上海交通大学机械系统与振动国家重点实验室,上海200240

年份：2011

卷号：30

期号：3

起止页码：165

中文期刊名：振动与冲击

外文期刊名：Journal of Vibration and Shock

收录：CSTPCD;;Scopus;北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；

基金：国家自然科学基金(50805046;50805019);上海市自然科学基金(08ZR1405800);中央高校基本科研业务费

语种：中文

中文关键词：转子;直裂纹;斜裂纹;呼吸效应;时变刚度特性

外文关键词：rotor; transverse crack; slant crack; breathing behavior; time-varying stiffness

摘要：采用有限元方法建立了裂纹转子系统的动力学方程,利用应变能释放率方法得到了裂纹单元的刚度矩阵,采用应力强度因子为零法模拟裂纹的呼吸效应,详细研究了不同深度的直裂纹和45°斜裂纹转子,在一个稳态旋转周期内,裂纹开闭规律以及转轴刚度时变特性。研究表明裂纹深度的增大使裂纹转轴的刚度变化增大,直裂纹与斜裂纹转轴的刚度变化特性具有明显差异,斜裂纹引起更多与更强的耦合振动,使转子的动力学性能更复杂。
The dynamic equations of cracked rotor system were established using finite element method.Based on the approach of strain energy release rate,the stiffness matrix of the crack element was derived.The breathing behavior of the crack was presented by taking into account the opening and closing of the crack and using stress intensity factor.The characteristics of the breathing process of transverse and slant cracks and the time-varying stiffness of the cracked element in a steady rotating period were studied detailedly.The increase of the surface crack depth raises the variation of stiffness of the cracked shaft.The features of stiffness variation of the shaft with transverse crack are dissimilar to those with slant crack.Compared with the transverse crack,the slant crack will lead to even more and stronger coupled vibration,and the dynamic performance of the rotor will be more complicated.