Assessment of vibration-based damage identification techniques
Assessment of vibration-based damage identification techniques
复制标题
DOI：
10.1016/j.jsv.2005.07.036
复制
发表时间：
2006-04-25
影响因子：
4.7
通讯作者：
Cremona, C
中科院分区：
文献类型：
--
作者：
Alvandi, A;Cremona, C
本文综述了几种常用的基于振动的损伤识别技术，并将其应用于结构损伤评估。通过一个不同损伤程度的简支梁算例，对这些方法的可靠性进行了研究。本文所述的技术是基于测量的模态参数，其仅使用可以通过动态测试容易地获得的结构的少数模态形状和/或模态频率。换句话说，通过实现两组动态测量，对应于结构寿命的两个时刻，可以获得动态模态参数。为了正确地评估这些技术的性能，不同的噪声水平被随机地引入到由随机力激励的模拟梁的响应信号中。对于不同的损伤和噪声水平，损伤检测的概率和虚警概率的总模拟次数进行评估。可以得出结论，在评估的技术中，应变能方法对于噪声信号呈现出最好的稳定性;然而，检测判断取决于本文讨论的阈值水平。模态曲率的变化、柔度的变化和柔度曲率的变化方法也能够检测和定位受损元件，但在复杂和同时损坏的情况下，这些技术显示出较低的效率。(c)2005爱思唯尔有限公司保留所有权利。
In this paper some usual vibration-based damage identification techniques (VBDIT) will be reviewed and used for structural damage evaluation. With the help of a simple supported beam with different damage levels the reliability of these techniques will be investigated. The techniques reviewed herein are based on measured modal parameters which use only few mode shapes and/or modal frequencies of the structure that can be easily obtained by dynamic tests. In other words, by realizing two sets of dynamic measurements, corresponding to two moments of the structure lifetime, the dynamic modal parameters can be obtained. In order to assess properly the performance of these techniques different noise levels are randomly :introduced to the response signals of a simulated beam which is exited by a random force. For different levels of damage and noise, the probabilities of damage detection and the probabilities of false alarm for the total number of simulations is evaluated. It can be concluded that among the evaluated techniques the strain energy method presents the best stability regarding noisy signals; however, the detection judgement depends on a threshold level which is discussed in this paper. The change in mode shape curvature, change in flexibility and change in flexibility curvature methods are also capable to detect and localise damaged elements but in the case of complex and simultaneous damages these techniques show less efficiency. (c) 2005 Elsevier Ltd. All rights reserved.