Remote vibration measurement system for spatial measurement of civil structures

用于土木结构空间测量的远程振动测量系统

• 批准号: 10555152
• 负责人: ABE Masato
• 金额: $ 7.49万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10555152/
• 关键词: Laser Doppler Vibrometer; natural frequency; vibration mode; experimental modal analysis; Bootstrap method; on-site measurement; ambient vibration measurement; reliability analysis; Bootstrap法

In order to detect local damage in structures using vibration measurement, measurement and identification of vibration modes with higher natural frequencies is needed. Also, measurement of these modes is increasingly becoming important as evaluation of environmental vibration/noise effect to surrounding residence is required in urban areas to ensure living comfort. However, in civil structures, the difficulties of measuring spatial vibration and disturbance decrease the identification accuracy of higher modes by conventional methods, such as accelerometers, because of its scale and high level environmental noise. Besides, densely distributed measurement tends to be costly since setting of accelerometers requires works at high positions with construction of temporary support for workers. In this project, applicability of Laser Doppler Vibrometer is studied to reliably measure vibration characteristics of spatially large civil structures under microscopic vibration such as ambient vibrat … More ion. By this technology, remote measurement can be achieved by scanning of surface by Laser beam, which potentially eliminates dangerous labor works at high position. In this study, non-stationary, and random components in measured ambient vibration are eliminated by sweeping the area of interested and stacking the time histories recorded repeatedly. In this way natural frequencies and mode shapes of higher modes can be identified with high accuracy by assuming the ambient vibration as a stationary process even without the knowledge of input excitation. Then, the measured modal frequencies and mode shapes after damage and measured data before, damage are compared to inversely solve the location and extent of stiffness change which will indicate the degree of damage in the structure. The method is demonstrated by experiments of plate vibration with additional mass which simulates local stiffness degradation. Finally, field measurement was conducted at actual elevated highways, and the applicability of the measurement is demonstrated. Less

为了利用振动测量方法检测结构的局部损伤，需要测量和识别具有较高固有频率的振动模态。此外，这些模式的测量变得越来越重要，因为在城市地区需要评估环境振动/噪声对周围居民的影响，以确保生活舒适性。然而，在土木结构中，由于空间振动和扰动测量的困难，传统方法（如加速度计）由于其规模和高水平的环境噪声而降低了识别高阶模态的精度。此外，由于加速度计的设置需要在较高的位置进行工作，并且需要为工人建造临时支架，因此密集分布的测量往往成本很高。本课题研究了激光多普勒测振仪在环境振动等微观振动条件下可靠测量空间大型土木结构振动特性的适用性。通过该技术，可以通过激光束扫描表面实现远程测量，从而潜在地消除了高空危险劳动。在本研究中，通过扫描感兴趣的区域并叠加重复记录的时间历史来消除被测环境振动中的非平稳和随机分量。通过这种方法，即使在不知道输入激励的情况下，假设环境振动为平稳过程，也可以高精度地识别高阶模态的固有频率和振型。然后，将损伤后测得的模态频率和模态振型与损伤前的实测数据进行对比，反求出反映结构损伤程度的刚度变化位置和程度。通过附加质量板的振动实验验证了该方法的有效性，模拟了板的局部刚度退化。最后，对实际高架公路进行了现场测量，验证了测量方法的适用性。少

项目成果

貝戸清之・阿部雅人・藤野陽三・依田秀則: "レーザードップラー速度計を用いた振動モード形の計測と損傷検出への応用"第2回構造物の診断に関するシンポジウム. 157-162 (1999)

Kiyoyuki Kaido、Masato Abe、Yozo Fujino、Hidenori Yoda：“使用激光多普勒测速仪测量振动模式形状及其在损伤检测中的应用”第二届结构诊断研讨会 157-162 (1999)。

貝戸清之・阿部雅人・藤野陽三: "振動観測データから得られる推定値の信頼性区間評価"土木学会第53回年次学術講演会. (1998)

Kiyoyuki Kaido、Masato Abe、Yozo Fujino：“从振动观测数据获得的估计值的置信区间的评估”日本土木工程学会第 53 届学术年会（1998 年）。

吉田純司・阿部雅人・藤野陽三: "1995年兵庫県南部地震における阪神高速湾岸線松の浜免震橋の地震時挙動と免震効果の検証"土木学会論文集. No.626. 37-50 (1999)

Junji Yoshida、Masato Abe、Yozo Fujino：“1995 年兵库县南部地震期间阪神高速公路湾线松野滨隔震桥的抗震性能和隔震效果验证”日本土木工程学会学报第 626 期。37- 50 (1999)

M. Abe, Y. Fujino and K. Kaito: "Detection of structural damage by ambient vibration measurement using Laser Doppler Vibrometer"The Fifth International Symposium on Non-Destructive Testing in Civil Engineering, Tokyo. (2000)

M. Abe、Y. Fujino 和 K. Kaito：“使用激光多普勒测振仪通过环境振动测量检测结构损坏”第五届土木工程无损检测国际研讨会，东京。

Kiyoyuki Kaito, Masato, Abe, Yozo Fujino: "Judgment of source of variation of vibration characteristics using statistical reasoning"The 54ィイD1thィエD1 annual meeting Japan society of Civil Engineers. (1999)

Kiyoyuki Kaito、Masato、Abe、Yozo Fujino：“利用统计推理判断振动特性变化源”第 54 届日本土木工程师学会年会（1999 年）。