Efficacy of modal curvature damage detection in various pre-damage data assumptions and modal identification techniques

作     者：Drozdowska, Milena Szafranski, Marek Szafranska, Anna Tomaszewska, Agnieszka 

作者机构：Gdansk Univ Technol Fac Civil & Environm Engn Dept Struct Mech Narutowicza 11-12 PL-80233 Gdansk Poland Gdansk Univ Technol Fac Civil & Environm Engn Dept Engn Struct Narutowicza 11-12 PL-80233 Gdansk Poland Gdansk Univ Technol Div Differential Equat & Applicat Math Inst Appl Math Narutowicza 11-12 PL-80233 Gdansk Poland 

出 版 物：《BULLETIN OF THE POLISH ACADEMY OF SCIENCES-TECHNICAL SCIENCES》 (Bull. Pol. Acad. Sci. Tech. Sci.)

年 卷 期：2025年第73卷第1期

核心收录：

学科分类：12[管理学] 1201[管理学-管理科学与工程(可授管理学、工学学位)] 08[工学] 

基　　金：Academic Computer Centre in Gdansk TASK 

主　　题：modal curvature based damage detection stochastic subspace identification eigensystem realization algorithm natural excitation technique masonry tower 

摘      要：The efficacy of modal curvature approach for damage localization is discussed in the paper in the context of input data. Three modal identification methods, i.e., Eigensystem Realization Algorithm (ERA), Natural Excitation Technique with ERA (NExT-ERA) and Covariance Driven Stochastic Subspace Identification (SSI-Cov), and four methods of determining baseline data, i.e., real measurement of the undamaged state, analytical function, Finite Element (FE) model and approximation of current experimental mode shape, are considered. Practical conclusions are formulated based on analysis of two cases. The first is a laboratory beam with a notch and the second is a stone-masonry historic lighthouse with modern restoration in its upper part. The analysis shows that NExT-ERA and SSI-Cov in combination with approximation of current mode shape provide high efficacy in damage localization alongside relatively straightforward determination of baseline data. It proves that the construction of advanced FE models of a structure can be replaced with a much simpler method of baseline data acquisition. Furthermore, the research shows the structural mode shapes identified with ERA may not always indicate the presence of damage.