损伤结构的实验曲率模态研究

Experimental Curvature Modal Analysis of Damaged Structures

为探讨基于振动模态分析的结构无损检测技术 ,把曲率模态应用于单向板这样的承弯结构 ,从理论上验证了该指标的变化是结构损伤程度和位置的函数。通过有限元数值模拟和单向板破坏实验 ,证明了利用该指标对判断承弯结构的损伤效果显著。该方法的进一步完善使利用振动诊断技术对大型结构进行无损检测成为可能。

A nondestructive testing technique based on modal analysis is discussed in order to develop a new,efficient and simple damage detection method for large structures.The 'curvature modal shapes(CMS)'is used as an index for judging the damage of the structures like unilateralism board.It is verified theoretically that the index is a function of the severity of deterioration and the location of the damage in a structure.It is also shown,through a simulation and an experiment,that the index could be used to detect small damages in structures efficiently.