作　　者： ; ; ; ;

机构地区： 清华大学机械工程学院先进成形制造教育部重点实验室

出　　处： 《水电能源科学》 2008年第5期150-152,127,共4页

摘　　要： 基于计算流体动力学(CFD)得到的水力学数据,采用有限元法对水轮机叶片的动应力进行数值分析,提取危险部位的应力时间历程进行雨流计数,建立了疲劳应力均值和幅值的二维随机变量分布规律并进行母体分布χ2的检验,为水轮机叶片的疲劳可靠性设计校核研究奠定了基础。 Fatigue stress analysis of Francis turbine blade is the first step of fatigue reliability design. The data calculated by Computational Fluid Dynamics （CFD） software were firstly transformed into the finite element analysis （FEA） software ANSYS by the interface program written in VC＋ ＋ language. Then, numerical analysis was carried out to obtain the fatigue stress by finite element method. The result shows that the spot of maximum stress by FEA analysis agrees with the observed actual failure location on the blade. By applying the rain-flow cycle counting to the stress time history, the two basic stochastic quantities of applied fatigue stress cycle-mean and amplitude-mean were counted to estimate the joint distribution density function parameters and then hypothesis test was checked for the joint distribution.

关 键 词： 混流式水轮机 有限元分析 雨流计数法 载荷谱 疲劳可靠性设计

领　　域： [水利工程] [交通运输工程] [动力工程及工程热物理]