Output-Only Damage Identification Using Enhanced Structural Characteristic Deflection Shapes and Adaptive Gapped Smoothing Method

[+] Author and Article Information
Shancheng Cao

Centre for Engineering Dynamics, School of Engineering, The University of Liverpool, Liverpool, L69 3GH, U.K.

Huajiang Ouyang

Centre for Engineering Dynamics, School of Engineering, The University of Liverpool, Liverpool, L69 3GH, U.K.

1Corresponding author.

ASME doi:10.1115/1.4037469 History: Received September 14, 2016; Revised June 23, 2017


Structural characteristic deflection shapes (CDS's) such as mode shapes which contain spatial knowledge of structures are highly sensitive for damage detection and localisation. Nevertheless, CDS's are vulnerable to measurement noise, which degrades the accuracy of damage identification. In order to enhance CDS-based damage identification, contributions are made in three aspects. First, a robust CDS estimation approach is proposed based on common principal component analysis, which estimates the CDS's as the common diagonaliser of a set of covariance matrices by joint approximation diagonalisation. Secondly, an adaptive gapped smoothing method is proposed and validated to be more accurate than the traditional gapped smoothing method. Thirdly, a new damage identification index capable of localising damage and indicating relative damage severity is defined without requiring information of healthy structures. Finally, numerical and experimental examples of beams and a frame with cracks are studied to demonstrate the advantages of the proposed damage identification method in terms of noise robustness and accuracy.

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