摘要
研究了涡轮自带冠叶片在考虑叶冠间不同接触情况下的非线性振动响应。建立了考虑相邻叶冠间的分离和重新接触以及离心刚化效应的涡轮自带冠叶片的弹簧质量模型,并推导了其动力学方程。碰撞力采用更符合实际的线性弹簧和非线性弹簧的组合来进行建模,摩擦力则采用依赖速度的指数型摩擦模型。仿真结果表明,涡轮自带冠叶片可以表现出非常复杂的非线性现象,并且可以出现周期1、周期2、周期3、周期4和混沌运动。间隙不对称会使自带冠叶片的运动更加复杂。
The nonlinear forced vibration responses of integrally shrouded turbine blade considering different contact state are investigated in this paper.A lumped mass model of integrally shrouded turbine blade considering separation and reattachment of adjacent shrouds and centrifugal stiffening effects is established and its dynamic equation is deduced.Collision force is approximated by linear and cubic springs together which is more realistic,and friction force is approximated by an exponential-type velocity-dependent model.Numerical results indicate that integrally shrouded turbine blade displays very complex nonlinear phenomena and it can experience periodic 1,periodic 2,periodic 3,periodic 4 and chaotic vibration.Gap asymmetry leads to more complicated motions of the shrouded blade.
作者
何冰冰
任兴民
何尚文
秦卫阳
马引钢
He Bingbing;Ren Xingmin;He Shangwen;Qin Weiyang;Ma Yingang(School of Mechanics,Civil Engineering and Architecture,Northwestern Polytechnical University,Xi′an 710072,China;School of Mechanics&Engineering Science,Zhengzhou University,Zhengzhou 450001,China)
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
2018年第2期308-314,共7页
Journal of Northwestern Polytechnical University
基金
国家自然科学基金(51405452)
西北工业大学研究生创意创新种子基金(z2017121)资助
关键词
自带冠叶片
分离
重新接触
非线性弹簧
分岔
integrally shrouded blade
separation
reattachment
nonlinear spring
bifurcation
