Extracting mode shapes for beams through a passing auxiliary mass
This paper shows an approach to evaluate mode shapes for beams through using a passing auxiliary mass. The coupled system of an auxiliary mass passing over a beam is time-dependent, and the corresponding instantaneous frequencies (IFs) are equivalent to the mode shapes. Hence, reconstruction of the...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2019
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/104655 http://hdl.handle.net/10220/49505 |
| _version_ | 1826113880768643072 |
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| author | Zhang, Yao Zhao, Hai-Sheng Lie, Seng-Tjhen |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Zhang, Yao Zhao, Hai-Sheng Lie, Seng-Tjhen |
| author_sort | Zhang, Yao |
| collection | NTU |
| description | This paper shows an approach to evaluate mode shapes for beams through using a passing auxiliary mass. The coupled system of an auxiliary mass passing over a beam is time-dependent, and the corresponding instantaneous frequencies (IFs) are equivalent to the mode shapes. Hence, reconstruction of the mode shapes is easy to be achieved through estimating the IFs. A simple algorithm based on ridge detection is proposed to reconstruct the mode shapes. This method is effective if the beam is light or the lumped mass is heavy. It is convenient since it requires an accelerometer mounted on the passing auxiliary mass rather than a serious of sensors mounted on the structure itself. It is also more practical because it is usually difficult to install external exciter. A lab-scale experimental validation shows that the new technique is capable of identifying the first three mode shapes accurately. |
| first_indexed | 2024-10-01T03:30:28Z |
| format | Journal Article |
| id | ntu-10356/104655 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:30:28Z |
| publishDate | 2019 |
| record_format | dspace |
| spelling | ntu-10356/1046552020-03-07T11:43:40Z Extracting mode shapes for beams through a passing auxiliary mass Zhang, Yao Zhao, Hai-Sheng Lie, Seng-Tjhen School of Civil and Environmental Engineering Mode Shapes Auxiliary Mass Engineering::Civil engineering This paper shows an approach to evaluate mode shapes for beams through using a passing auxiliary mass. The coupled system of an auxiliary mass passing over a beam is time-dependent, and the corresponding instantaneous frequencies (IFs) are equivalent to the mode shapes. Hence, reconstruction of the mode shapes is easy to be achieved through estimating the IFs. A simple algorithm based on ridge detection is proposed to reconstruct the mode shapes. This method is effective if the beam is light or the lumped mass is heavy. It is convenient since it requires an accelerometer mounted on the passing auxiliary mass rather than a serious of sensors mounted on the structure itself. It is also more practical because it is usually difficult to install external exciter. A lab-scale experimental validation shows that the new technique is capable of identifying the first three mode shapes accurately. 2019-08-01T04:16:04Z 2019-12-06T21:37:02Z 2019-08-01T04:16:04Z 2019-12-06T21:37:02Z 2019 Journal Article Zhang, Y., Zhao, H.-S., & Lie, S.-T. (2019). Extracting mode shapes for beams through a passing auxiliary mass. Journal of Vibration and Acoustics, 141(5), 054501-. doi:10.1115/1.4043542 1048-9002 https://hdl.handle.net/10356/104655 http://hdl.handle.net/10220/49505 10.1115/1.4043542 en Journal of Vibration and Acoustics © 2019 American Society of Mechanical Engineers. All rights reserved. |
| spellingShingle | Mode Shapes Auxiliary Mass Engineering::Civil engineering Zhang, Yao Zhao, Hai-Sheng Lie, Seng-Tjhen Extracting mode shapes for beams through a passing auxiliary mass |
| title | Extracting mode shapes for beams through a passing auxiliary mass |
| title_full | Extracting mode shapes for beams through a passing auxiliary mass |
| title_fullStr | Extracting mode shapes for beams through a passing auxiliary mass |
| title_full_unstemmed | Extracting mode shapes for beams through a passing auxiliary mass |
| title_short | Extracting mode shapes for beams through a passing auxiliary mass |
| title_sort | extracting mode shapes for beams through a passing auxiliary mass |
| topic | Mode Shapes Auxiliary Mass Engineering::Civil engineering |
| url | https://hdl.handle.net/10356/104655 http://hdl.handle.net/10220/49505 |
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