Structural Damage Identification Using Frequency Domain Responses and a Differential Evolution Algorithm
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RESEARCH PAPER
Structural Damage Identification Using Frequency Domain Responses and a Differential Evolution Algorithm S. M. Seyedpoor1 · N. Pahnabi1 Received: 17 June 2017 / Accepted: 25 October 2020 © Shiraz University 2020
Abstract In this study, a damage identification method based on observing the changes in frequency response functions (FRFs) of a structure, due to damage, with taking advantage of differential evolution algorithm (DEA) as an optimization solver is presented. Firstly, by using the FRFs of a healthy structure, damaged structure and analytical model of the structure, an efficient objective function is defined for the optimization. Then, the DEA is employed to solve the optimization-based damage detection problem for finding the location and severity of the damage. The performance of the proposed method is evaluated for a beam and two planar frames by making a parametric study. The numerical results indicate that the method can provide a reliable tool to accurately identify the structural damage. Keywords Damage detection · Frequency response function · Optimization · Differential evolution
1 Introduction The early detection of structural damage is one of the major challenges in aerospace, civil and mechanical engineering. Many structures are subjected to loading forces bigger than their design capacity or have been utilized in a different manner compared to their standard expectation. Therefore, most of the structural systems may experience some local damages during their lifetime which‚ by neglecting them‚ may lead to decreasing in the functional age or even an overall failure of structures. The structural damage is assigned to any susceptible factor in elements of a structure which would have adverse effects on the condition of the structure. Structural damage may be caused by the irreversible changes in structural materials, the change of physical properties or structural integrity. In addition, the damage would alter the static and dynamic responses of the structure in different ways. These changes can be considered as a damage identification indicator. In the past two decades, to avoid the unexpected huge costs and increase in the lifetime of the structure, the issues related to damage detection have been paid considerable attention to by the research community. * S. M. Seyedpoor [email protected] 1
Department of Civil Engineering, Shomal University, Amol, Iran
The classic methods were capable of identifying the surface damage, therefore, the needs to more accurate methods for damage identification were led to developing the methods which operate using the changes in the vibrating characteristics of a structure. Within the presented methods, the dynamic damage detection methods based on changes in frequency response functions (FRFs) have attracted more attention. During the last few years, the application of damage detection techniques using FRFs has been examined in many researches. Mannan and Richardson (1990) utilized the FRFs measurement and their changes for not on
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