摘要
双金属复合翅片管是一种高效传热元件,容易发生流体诱导振动破坏,对其进行振动模态理论分析具有重要的工程指导意义。针对双金属复合翅片管的结构特征,将其简化为串、并联刚度系统,采用组合截面等效弯曲刚度、等效扭转刚度和等效抗拉压刚度,并结合等效质量和等效转动惯量的方法,对其弯曲、扭转和轴向振动模态进行理论解析。为了验证理论分析方法的准确性,对双金属复合翅片管的振动模态进行了实验测试和有限元分析。研究了翅片几何参数对双金属复合翅片管振动频率的影响规律。结果表明,对于矩形翅片形式的钢铝双金属翅片管,其弯曲、扭转和轴向振动频率均随翅片高度和翅片厚度的增大而减小,随翅片间距的增大而增大。
Bimetallic finned tubes are highly efficient heat transfer components,and they are easy to have flowinduced vibration damages. Their modal analysis has an important engineering significance. A bimetallic finned tube was simplified as a system with series and parallel stiffnesses according to its structural characteristics. The bending,torsion and axial vibration modes of the bimetallic finned tube were analyzed theoretically by using the methods of equivalent cross-sectional bending stiffness,equivalent torsion stiffness and equivalent tension-compression stiffness combined with the equivalent mass and equivalent moment of inertia. The tests and finite element analysis for vibration modes of bimetallic finned tubes were conducted in order to verify the correctness of the theoretical methods. The effects of fin geometry on the natural frequencies of a steel-aluminum bimetal finned tube with rectangular fins were investigated. The results showed that its bending,torsional and axial vibration natural frequencies decrease with increase in fin height and fin thickness,and increase with increase in fin pitch.
出处
《振动与冲击》
EI
CSCD
北大核心
2016年第5期201-206,共6页
Journal of Vibration and Shock
基金
山西省自然科学基金(2013011025-2)
关键词
双金属翅片管
振动模态
等效截面刚度
等效质量
等效转动惯量
bimetallic finned tubes
vibration modes
equivalent cross-sectional stiffness
equivalent mass
equivalent moment of inertia
作者简介
郭建英 女，博士，副教授，1972年11月生
