摘要
阐述了结构裂纹位置识别的模态应变能法，首先采用有限元方法分析了裂纹位置及深度对结构固有频率的影响．绘制了固有频率的改变量随裂纹位置的变化曲线，并且将该曲线与有限元分析获得的模态应变能分布曲线及应变模态振型进行了对比分析，然后利用结构固有频率的改变对裂纹位置进行识别，讨论了不同的单元划分和不同模态阶数对裂纹位置识别的影响。对悬臂梁结构测试例子的分析表明．该方法能较好地识别具有单个裂纹结构的裂纹位置。
A modal strain energy method to identify crack location in a structure is reported. In the method the structural nat- ural frequencies are used to detect the crack position. The influence of different element discretization and different modes to the crack detection is discussed. The modal strain energy versus the elements and the variations of eigenfrequencies for different crack positions and strain modes are compared. An experimental cantilever beam example shows that the method can detect crack loca- tion with satisfactory precision.
出处
《武汉理工大学学报》
CAS
CSCD
2001年第5期71-74,共4页
Journal of Wuhan University of Technology
基金
国家自然科学基金资助项目(19772038).
