Detection of damage and loading on the bridge and its service structure by raser doppler vibrometers

利用激光多普勒测振仪检测桥梁及其使用结构的损伤和载荷

• 批准号: 14350238
• 负责人: FUJINO Yozo
• 金额: $ 7.81万
• 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: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350238/
• 关键词: scanning laser; dynamic load detection; inverse analysis; modal analysis; laser doppler vibrometer; higher modes identification; ERA method

Identification of external forces applied on a structure during its operational life is of practical importance for structural design and maintenance. Especially, identification using dynamic measurement has attracted much research interest because of its relative advantage in measurement. In this study, forces in 3 different types are identified experimentally, i.e, impact-force, inertia force and sound pressure using Laser Doppler Vibrometers. Identification methods employed are : pseudo-inverse method and regularization method. Error obtained from each identification method and each experimental case is evaluated and the proposed method is shown to have wide applicability to various loading cases.Damage identification of bolted joints by Laser Doppler Vibrometers is also studied experimentally. It was confirmed that detection of loosened bolts can be made from the change of the modal property measured carefully by LDV.

结构在使用寿命期间所受外力的识别对于结构设计和维护具有重要的实际意义。尤其是动态测量辨识，由于其在测量方面的相对优势，引起了人们的研究兴趣。在本研究中，我们利用雷射多卜勒振动仪，以实验方式辨识出三种不同类型的力，即撞击力、惯性力及声压。辨识方法有：伪逆法和正则化法。对每种识别方法和每种试验情况的误差进行了评价，表明所提出的方法对各种载荷情况都有广泛的适用性。实验结果表明，通过LDV测量的模态特性变化，可以对螺栓松动进行检测。

项目成果

Sakda, 藤野陽三, 阿部雅人: "動的外力による応答からの外力推定に関する実験"土木学会年次講演会概要集. CD-ROM. (2002)

Sakda、Yozo Fujino、Masato Abe：“动态外力响应的外力估计实验”日本土木工程师学会年会摘要 CD-ROM（2002 年）。

Yozo FUJINO, Masato ABE: "Structural health monitoring in civil infrastructures - research activities at the Bridge and Structure laboratory of the University of Tokyo"First International Conference on Structural Health Monitoring and Intelligent Infrastr

Yozo FUJINO、Masato ABE：“民用基础设施中的结构健康监测 - 东京大学桥梁与结构实验室的研究活动”第一届结构健康监测和智能基础设施国际会议

Ritdumrongkul, S., Abe, M., Fujino, Y.: "Experimental study on health monitoring of bolted joints using piezoceramic and Laser Doppler Vibrometers"First International Conference on Structural Health Monitoring and Intelligent Infrastructure. Vol.2. 825-83

Ritdumrongkul, S.、Abe, M.、Fujino, Y.：“使用压电陶瓷和激光多普勒测振仪对螺栓接头进行健康监测的实验研究”第一届结构健康监测和智能基础设施国际会议。

Fujino, Y, Abe, M.: "Monitoring of bridges"Int.Conf.of Bridge Safety and Management. (CD-ROM). (2002)

Fujino, Y, Abe, M.：“桥梁监测”桥梁安全与管理国际会议。

Ritdumrongkul, S., Abe, M, Fujino, Y, Miyashita, T: "Quantitative health monitoring of bolted joints using a piezoceramic actuator-sensor"Smart Materials and Structures. Vol.13. 19-20 (2003)

Ritdumrongkul, S.、Abe, M、Fujino, Y、Miyashita, T：“使用压电陶瓷执行器传感器对螺栓接头进行定量健康监测”智能材料和结构。