结构损伤识别的联合灵敏度方法研究

提出一种联合灵敏度方法用于结构的损伤识别中,该方法将频率、振型和柔度三种灵敏度结合起来,可以获得更多的方程来求解损伤参数。利用数值算例对所提方法进行验证,并将所得计算结果与特征对灵敏度方法计算结果进行比较。结果表明所提方法是合理可行的。

STRUCTURAL DAMAGE DETECTION BY A COMBINED SENSITIVITY METHOD

A numerical technique is presented that combines eigenparameter sensitivity with flexibility sensitivity to detect structural damage.The contribution of this s tudy is the coupling of the identification equations from the eigenparameter sen sitivity and the flexibility sensitivity for the solution of the identification problem.The main advantage of the combination of these two sensitivities is tha t it can provide a considerable number of equations to directly identify structu ral damage.The proposed approach is demonstrated and compared with the eigenpar ameter sensitivity method on two numerical examples.The results show the good e fficiency and stability of the combined perturbation method on the identificatio n of damage on more than one element.It has been shown that the results obtaine d by the combined perturbation method are more accurate than those obtained by t he eigenparameter sensitivity technique since the number of identification equat ions increases.The presented methodology may be a promising tool to be used by research groups working on experimental damage identification.