板壳结构的多位置损伤诊断方法研究

NEW METHOD FOR DAMAGE DETECTION OF PLATE AND SHELL SUBJECTED TO MULTI-LOCATION DAMAGES

提出一种适用于板壳结构的多位置损伤诊断方法。取结构的一阶振型变化率作为损伤诊断标识量,计算分析显示该标识量不仅对结构的损伤位置以及损伤程度敏感,而且在多位置损伤状态下结构的损伤位置和损伤程度是各单位置损伤状态下结构的损伤位置以及损伤程度的叠加。以此为基础,提出基于一阶振型变化率的板壳结构的损伤诊断方法。算例表明该方法不仅可以准确地完成板壳结构的多位置损伤诊断,并且可以大大简化整个损伤诊断的过程。

A new method to detect the damage of plate and shell subjected to multi-location damages is proposed. With the variation rate of the first mode as a signature for damage detection, it is shown that the variation rate of the first mode not only is sensitive to the damage location and the extent, but also obeys the law of superposition. Then, on the basis of the variation of the first mode, the new detecting method is put forward. Numerical example reveals that the new method can realize the multi-locatlon damage detection of the plate and shell structure effectively, and at the same time simplify the process of the damage detection.