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j.tust.2020.103460.pdf | 1.92 MB | Adobe PDF | 見る/開く |
タイトル: | Detection and characteristics estimation of defects in concrete structures using laser ablation-induced vibration |
著者: | Yasuda, Naotoshi Misaki, Norikazu Shimada, Yoshinori Yamaoka, Daiki |
著者名の別形: | 保田, 尚俊 |
キーワード: | Inspection method Laser ablation Concrete Vibration Modal identification |
発行日: | Sep-2020 |
出版者: | Elsevier BV |
誌名: | Tunnelling and Underground Space Technology |
巻: | 103 |
論文番号: | 103460 |
抄録: | This paper proposes a method for detection and estimation of the characteristics of defects in concrete structures using laser ablation-induced vibration for non-contact structural inspection to prevent partial spalling. Two types of lasers are used: the first is an impact laser that is used to induce vibrations in the measurement target and the second is a detection laser that is used to measure these induced vibrations. Laboratory tests are performed using concrete specimens with and without an internal defect. The results show that the presence of a defect can be estimated from the occurrence of damped oscillations in the measurement data. The presence or absence of these damped oscillations can be determined using the least-squares complex frequency-domain (LSCF) method, which is a fast-stabilizing parameter estimation method for modal identification problems. Additionally, when a defect is present, the defect vibration characteristics, such as natural frequencies and damping ratios, can be estimated. In particular, the natural frequencies can be estimated accurately. |
著作権等: | © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The full-text file will be made open to the public on 1 September 2022 in accordance with publisher's 'Terms and Conditions for Self-Archiving'. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 This is not the published version. Please cite only the published version. |
URI: | http://hdl.handle.net/2433/252795 |
DOI(出版社版): | 10.1016/j.tust.2020.103460 |
出現コレクション: | 学術雑誌掲載論文等 |
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