变刚度复杂梁结构损伤检测方法研究  

Damage Detection Method in Complicated Beams With Varying Flexural Stiffness

作　　者：冯侃[1] 励争[1] 高桂云[1] 苏先樾[1] 

机构地区：[1]北京大学工学院力学与空天技术系,湍流与复杂系统国家重点实验室,北京100871

出　　处：《应用数学和力学》2011年第4期445-454,共10页Applied Mathematics and Mechanics

基　　金：国家重点基础研究发展计划(973计划)资助项目(2007CB714603)

摘　　要：提出了适用于复杂梁结构损伤检测的子段模态应变能法SSEM(subsection strain energymethod),并分析了该方法的适用性条件.通过对变截面梁的有限元计算,以及对纤维增强复合材料风机叶片缩比模型的试验分析,验证了SSEM方法确定的结构损伤指标对损伤准确定位的可靠性.该基于振动的变刚度复杂梁结构的损伤检测方法,可应用于工程实际中梁和类梁整体结构的损伤检测.A damage detection method for complicated beam-like structures was proposed based on the subsection strain energy method（SSEM）,and its applicable condition was introduced.For a beam with continuously varying flexural stiffness and an edge crack,the SSEM was applied to detect the crack location effectively by numerical modal shapes.As a complicated beam,the glass fiber-reinforced composite model of a wind turbine blade was studied by an experimental modal analysis.The SSEM was used to calculate the damage index from the measured modal parameters,and to locate the damage position in the blade model successfully.The results indicate that the SSEM based on the modal shapes can be used to detect the damage in complicated beams or beam-like structures in engineering applications.

关 键 词：损伤检测 模态应变能 变刚度梁 纤维增强复合材料 风机叶片 

分 类 号：O321[理学—一般力学与力学基础] O327[理学—力学]