环境自然激励下一种结构损伤在线识别方法

基金项目: 国家自然科学基金资助项目(59775022)

A Method of Online Damage Identification for Structures Based on Ambient Vibration

Research Center of Ultrasonic Motors, Nanjing University of Astronautics and Aeronautics, Nanjing 210016, P. R. China;

摘要: 提出了一种环境自然激励下工程结构损伤识别方法，该法仅仅通过结构的输出数据识别结构的损伤．首先在结构完好的情况下，通过结构的输出数据识别外部统计参数；然后在结构损伤情况下，通过结构的输出数据识别结构的损伤分布函数．给出了识别结构损伤的理论模型和计算方法．数值仿真结果表明，该方法具有较高的辨别率和计算精度，能够使用在桥梁和建筑的健康监测中．
- 损伤识别 /
- 参数识别 /
- 在线识别技术 /
- 健康监测技术
Abstract: A method of damage identification for engineering structures based on ambient vibration is put forward,in which output data are used only.Firstly,it was identification of the statistic parameters to associate with the exterior excitation for undamaged structures.Then it was detection and location of the structural damages for damaged structures.The ambient identification method includes a theoretical model and numerical method.The numerical experiment results show the method is precise and effective.This method may be used in health monitoring for bridges and architectures.
- damage identification /
- parameter identification /
- online identification technique /
- health monitoring technique

[1]	Thyagarajan S K,Schulz M J,Pai P F.Detecting structural damage using frequency response function[J].Journal of Sound and Vibration,1998,210(1):162—170. doi: 10.1006/jsvi.1997.1308
[2]	Abdo M A- B,Hori M.A numerical study of structural damage detection using changes in the rotation of mode shapes[J].Journal of Sound and Vibration,2002,251(2):227—239. doi: 10.1006/jsvi.2001.3989
[3]	Zou Y,Tong L,Steven G P.Vibration-based model-dependent damage (delimitation) identification and health monitoring for composite structures—A review[J].Journal of Sound and Vibration,2000,230(2):357—378. doi: 10.1006/jsvi.1999.2624
[4]	James G H,Garne T G.The natural excitation technique(NExT) for modal parameter extraction from operating structures[J].Internat J Analytical & Experimental Modal Analysis,1995,10(4):260—277.
[5]	Lee Usik,Shin Jinho.A frequency response function-based structural damage identification method[J].Computers and Structures,2002,80:117—132. doi: 10.1016/S0045-7949(01)00170-5
[6]	Luo H,Hanagud S.An integral equation for changes in the structural dynamics characteristics of damaged structures[J].Internat J Solids and Structures,1997,34(35/36):4557—4579. doi: 10.1016/S0020-7683(97)00038-3
[7]	Banks H T,Inman D J,Leo D J,et al. An experimentally validated damage detection theory in smart structures[J].Journal of Sound and Vibration,1996,191(5):859—880. doi: 10.1006/jsvi.1996.0160

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