Damage detection using frequency shift path
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...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2016
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/80399 http://hdl.handle.net/10220/40506 |
| _version_ | 1826120506901790720 |
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| author | Lie, Seng Tjhen Zhang, Yao Wang, Longqi |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Lie, Seng Tjhen Zhang, Yao Wang, Longqi |
| author_sort | Lie, Seng Tjhen |
| collection | NTU |
| description | 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. |
| first_indexed | 2024-10-01T05:17:34Z |
| format | Journal Article |
| id | ntu-10356/80399 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:17:34Z |
| publishDate | 2016 |
| record_format | dspace |
| spelling | ntu-10356/803992020-03-07T11:43:30Z Damage detection using frequency shift path Lie, Seng Tjhen Zhang, Yao Wang, Longqi School of Civil and Environmental Engineering Auxiliary mass Damage detection Discrete time Fourier transform Frequency shift path 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. Accepted version 2016-05-09T09:18:43Z 2019-12-06T13:48:34Z 2016-05-09T09:18:43Z 2019-12-06T13:48:34Z 2016 2015 Journal Article Wang, L., Lie, S. T., & Zhang, Y. (2015). Damage detection using frequency shift path. Mechanical Systems and Signal Processing, 66, 298-313. 0888-3270 https://hdl.handle.net/10356/80399 http://hdl.handle.net/10220/40506 10.1016/j.ymssp.2015.06.028 192429 en Mechanical Systems and Signal Processing © 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: [http://dx.doi.org/10.1016/j.ymssp.2015.06.028]. 31 p. application/msword |
| spellingShingle | Auxiliary mass Damage detection Discrete time Fourier transform Frequency shift path Lie, Seng Tjhen Zhang, Yao Wang, Longqi Damage detection using frequency shift path |
| title | Damage detection using frequency shift path |
| title_full | Damage detection using frequency shift path |
| title_fullStr | Damage detection using frequency shift path |
| title_full_unstemmed | Damage detection using frequency shift path |
| title_short | Damage detection using frequency shift path |
| title_sort | damage detection using frequency shift path |
| topic | Auxiliary mass Damage detection Discrete time Fourier transform Frequency shift path |
| url | https://hdl.handle.net/10356/80399 http://hdl.handle.net/10220/40506 |
| work_keys_str_mv | AT liesengtjhen damagedetectionusingfrequencyshiftpath AT zhangyao damagedetectionusingfrequencyshiftpath AT wanglongqi damagedetectionusingfrequencyshiftpath |