结构损伤诊断的改进灵敏度方法

STRUCTURAL DAMAGE DETECTION BY AN IMPROVED SENSITIVITY TECHNIQUE

提出一种改进的灵敏度方法用于工程结构损伤检测中.通过在迭代算法中引入一个"加速"公式来迅速获得足够精确的识别结果,避免了多次迭代,可以大大减少计算花费.用文献[8]和文献[10]中的两个数值算例对所提方法进行了验证,并把结果和原文中的计算结果进行比较.结果表明:采用改进的方法一般只需经过一次计算即可获得精度更高的识别结果,避免了多次迭代,显著减少了计算花费,显示了改进方法突出的优越性.

In this paper,an improved sensitivity technique is presented for structural damage detection.The drawback of the existing sensitivity methods is discussed firstly and then an improved method is proposed.In this contribution,a simple accelerated formula used in the iteration process is developed.With the introduction of the accelerated formula,the proposed method is able to quantify large damages without any high-order analysis on the eigen-parameters or multi-iterations.The effectiveness of the proposed method is illustrated using simulated data with measurement noise on two published numerical examples in references[8] and.The results show that the proposed procedure is economical in computation and is simple to implement.Regardless of whether the damage is small or large,the proposed method can identify the extent of structural damages and its location accurately only using the first iteration.It has been shown that the presented scheme may be useful for structural damage identification.