矩形管内不可压缩粘性流中简支梁的稳定性  

Stability of Pinned-Pinned Beam in a Rectangular Tube Filled with Incompressible Viscous Fluids

作　　者：鲁丽[1] 杨翊仁[1] 

机构地区：[1]西南交通大学应用力学与工程系,四川成都610031

出　　处：《西南交通大学学报》2001年第6期561-564,共4页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金 (19872 0 5 8);高等学校骨干教师资助计划;四川省应用基础基金资助项目

摘　　要：研究刚性矩形管内板状简支梁在不可压缩粘性流体作用下的稳定性。采用假设模态法建立系统的运动微分方程。着重研究板的厚度及板与刚性矩形管间的两个间隙对系统稳定性的影响。结果表明 ,板厚及间隙都对系统稳定性有较大的影响 ,使临界流速发生较大变化 ,且两间隙一起增加或减少与保持一间隙不变而使另一间隙改变对临界流速的影响不同。The stability of a pinned plate type beam in a rigid rectangular tube with incompressible viscous fluids flowing within it is studied. The assumption mode method is utilized to derive the motion equations of the structure. The effects of the thickness of the beam and the gaps between the beam and the tube walls on the stability of the model are discussed. The results show that both the thickness and the gaps have significant influences on the stability of the system and the critical velocity of the system changes remarkably with their variations. In addition, whether the two gaps change at the same time, that is, one changes while the other keeps unchanged, has different effects on the critical velocity of the system.

关 键 词：稳定性 板状简支梁 临界流速 核反应堆 燃料元件 流致振动 不可压缩粘性流 

分 类 号：TL334[核科学技术—核技术及应用]