A kernel canonical correlation analysis approach for removing environmental and operational variations for structural damage identification. (31st March 2023)

• Record Type: Journal Article
• Authors: Huang, Jie-zhong; Yuan, Si-Jie; Li, Dong-sheng; Li, Hong-nan
• Is Part Of: Journal of sound and vibration. Volume 548(2023)
• Publication Date: 2023-03-31
• Subjects: Structural health monitoring -- Damage detection -- Environmental and operational variation -- Kernel canonical correlation analysis -- Data normalization; Sound -- Periodicals; Vibration -- Periodicals; Son -- Périodiques; Vibration -- Périodiques; Sound; Vibration; Periodicals; Electronic journals; 620.205
• DOI: 10.1016/j.jsv.2022.117516
• Languages: English
• ISSNs: 0022-460X

Abstract

Highlights: A new damage detection method under EOV is proposed. The proposed KCCA method is a nonlinear output-only method. Damage detection results are insensitive to nonlinear correlated data and different grouping The information entropy of the kernel matrix is used to determine the hyperparameter of KCCA. The method is tested on both numerical and experimental examples. Abstract: Vibration-based damage detection relies on the observation of changes in damage-sensitive dynamic features. However, a major problem is that dynamic features are sensitive not only to structural damage but also to environmental and operational variations (EOVs), such as temperature, humidity, and operational loading. In addition, the influence of EOVs on damage-sensitive features is often nonlinear, which limits the application of many linear methods in the removal of environmental effects. To remove the nonlinear effects of EOVs on dynamic features, an improved method based on kernel canonical correlation analysis (KCCA) is proposed in this study. Using this method, the monitored data were divided into two groups. The two sets of data were then mapped into a higher-dimensional space through the kernel trick to determine their implicit linear relationship. Subsequently, two variables that share the co-occurrence information of EOV effects were computed using canonical correlation analysis (CCA), and a stationary residual insensitive to EOVs was obtained. Furthermore, the proposed approach was examined using a simulated 7-DOF example and then applied to real monitored data from the Z24 bridge, demonstrating that nonlinear EOV effects can be successfully removed and damage can be accurately identified.