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Title: Damage detection using frequency shift path
Authors: Lie, Seng Tjhen
Zhang, Yao
Wang, Longqi
Keywords: Auxiliary mass
Damage detection
Discrete time Fourier transform
Frequency shift path
Issue Date: 2015
Source: Wang, L., Lie, S. T., & Zhang, Y. (2015). Damage detection using frequency shift path. Mechanical Systems and Signal Processing, 66, 298-313.
Series/Report no.: Mechanical Systems and Signal Processing
Abstract: This paper introduces a novel concept called FREquency Shift (FRESH) path to describe the dynamic behavior of structures with auxiliary mass. FRESH path combines the effects of frequency shifting and amplitude changing into one space curve, providing a tool for analyzing structure health status and properties. A damage index called FRESH curvature is then proposed to detect local stiffness reduction. FRESH curvature can be easily adapted for a particular problem since the sensitivity of the index can be adjusted by changing auxiliary mass or excitation power. An algorithm is proposed to adjust automatically the contribution from frequency and amplitude in the method. Because the extraction of FRESH path requires highly accurate frequency and amplitude estimators; therefore, a procedure based on discrete time Fourier transform is introduced to extract accurate frequency and amplitude with the time complexity of View the MathML source, which is verified by simulation signals. Moreover, numerical examples with different damage sizes, severities and damping are presented to demonstrate the validity of the proposed damage index. In addition, applications of FRESH path on two steel beams with different damages are presented and the results show that the proposed method is valid and computational efficient.
ISSN: 0888-3270
DOI: 10.1016/j.ymssp.2015.06.028
Rights: © 2015 Elsevier. This is the author created version of a work that has been peer reviewed and accepted for publication by Mechanical Systems and Signal Processing, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles

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