水轮机转轮叶片系统动力分析(Ⅱ)——实例分析  

Dynamic analysis of hydraulic turbine runner and blade system(Ⅱ) —Analysis of examples

作　　者：杜建镔[1] 何世江 王勖成[1] 

机构地区：[1]清华大学工程力学系

出　　处：《清华大学学报（自然科学版）》1998年第8期72-75,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金;机械工业技术发展基金

摘　　要：考虑到１６结点相对自由度壳元能很好地描述薄壳和厚壳的性质，而且和三维实体单元的联接也相当方便，本文采用该种单元对水轮机叶片进行离散，并通过样条插值获得叶片有限元网格结点的三维坐标。对水轮机转轮叶片系统的动力特性进行了具体的分析计算，得到了各阶固有频率及相应模态。结果表明，水轮机转轮最低若干阶频率的振动是以下环为主的振动，同时指出，对不同阶次的频率，附加质量的影响是不同的。The method based on the dynamics of rotationally periodic structure and the theory of added mass developed in Part Ⅰ is used for the dynamic analysis of hydraulic turbine runner in this paper. The 16 noded relative degree of freedom shell element is discussed and used to mesh the blades of the runner. The coordinates of the nodes are acquired by spline interpolation. A hydraulic turbine runner and blade system is calculated. Its natural frequencies and mode shapes are acquired and the influence of the added mass on the frequency is discussed.

关 键 词：水轮机 转轮 动力分析 插值 叶片系统 

分 类 号：TK730.323[交通运输工程—轮机工程]