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

为了使用振动测量来检测结构的局部损坏，需要测量和识别具有较高固有频率的振动模式，而且，随着城市中需要评估环境振动/噪声对周围住宅的影响，这些模式的测量变得越来越重要。然而，在土木结构中，测量空间振动和扰动的困难降低了传统方法（例如加速度计）的识别精度，因为它的规模和高水平的环境噪声。自从设定以来成本往往很高加速度计需要在高处工作，并为工人建造临时支撑。在该项目中，研究了激光多普勒测振仪的适用性，以通过该技术可靠地测量空间大型土木结构在微观振动（例如环境振动）下的振动特性。可以通过激光束扫描表面来实现远程测量，这可能消除高处的危险劳动工作。在这项研究中，通过扫描感兴趣的区域和消除了测量的环境振动中的非平稳和随机分量。通过这种方式，即使不知道输入激励，也可以通过将环境振动假设为稳态过程来高精度地识别较高模态的固有频率和模态振型。最后通过模拟局部刚度退化的附加质量板振动实验来验证该方法。 ，实地测量是在实际高程下进行的高速公路，并证明了测量的适用性。

项目成果

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）。

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)。

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。

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)

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）。