Den Hartog判据的修正  

Den Hartog Criteria Revision

作　　者：樊社新[1] 廖小平[1] 朱江新[1] 林义忠[1] 傅忠[1] 

机构地区：[1]广西大学机械工程学院,广西南宁530004

出　　处：《水电能源科学》2006年第4期68-69,共2页Water Resources and Power

基　　金：国家自然科学基金资助项目(50377006)

摘　　要：从动力学方程导出特征方程,应用复变函数理论对特征方程进行了分析,得出当升力曲线初始斜率为正且充分大时可导致舞动。指出DenHartog判据存在不足的原因,是忽略了输电线的横向运动和扭转运动的耦合。说明DenHartog判据的力学意义是升力曲线初始斜率为负产生的负阻尼导致舞动,升力曲线初始斜率为正且充分大时产生的负刚度也可导致舞动。The purpose of this paper is to improve Den Hartog criteria. Characteristic equation is derived from dynamic equation and analysis of the characteristic equation is made by use of complex function theory. The conclusion gotten in this paper is that galloping can be resulted yet by sufficient large positive slope of lift curve. It is pointed out that the meaning of Den Hartog criteria is resulted by negative damped deriving from negative slope of life curve. It is pointed out that the meaning of the conclusion gotten in this paper is resulted by negative rigidity derived from sufficient large positive slope of lift curve.

关 键 词：输电线 舞动 气动力 负阻尼 负剐度 

分 类 号：TM723[电气工程—电力系统及自动化]