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工程力学  2012 

结构损伤与荷载共同识别的研究

DOI: 10.6052/j.issn.1000-4750.2011.05.0275

Keywords: 结构健康监测,虚拟变形法(VDM),荷载识别,损伤识别,荷载形函数

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Abstract:

针对结构中同时存在未知损伤和荷载的情况,基于虚拟变形法(VDM)发展一种两者共同识别的时域方法。VDM方法利用虚拟变形模拟结构损伤,可快速计算模型改变后的响应。该文首先结合有限元理论把VDM方法拓展到具有多个单元变形的结构中;然后考虑结构存在未知荷载时,利用未损伤理论模型同时识别荷载和虚拟变形,继而由虚拟变形和单元实际变形的关系来识别判断损伤类型和识别损伤大小;最后通过一个悬臂梁的试验进行方法验证,试验中未知荷载和损伤(包括其类型和大小)均能够被有效识别,并利用提出的移动时间窗和荷载形函数方法实现损伤与荷载的在线识别。

References

[1]  Jankowski ?ukasz. Off-line identification of dynamic loads [J]. Structural and Multidisciplinary Optimization, 2009, 37(6): 609―623
[2]  智浩, 文祥荣, 缪龙秀, 等. 动态载荷的频域识别方法[J]. 北方交通大学学报, 2000, 24(4): 5―10.
[3]  Zhi Hao, Wen Xiangrong, Miao Longxiu, et al. Dynamic loading identification in frequency domain [J]. Journal of Northern Jiaotong University, 2000, 24(4): 5―10. (in Chinese)
[4]  Ha Q P, Trinh H. State and input simultaneous estimation for a class of nonlinear systems [J]. Automatica, 2004, 40: 1779―1785
[5]  Allen M S, Carne T G. Delayed, multi-step inverse structural filter for robust force identification [J]. Mechanical Systems and Signal Processing, 2008, 22: 1036―1054
[6]  Liu J J, Ma C K, Kung I C, et al. Input force estimation of a cantilever plate by using a system identification technique [J]. Computer Methods in Applied Mechanics and Engineering, 2000, 190(11/12): 1309―1322.
[7]  Ko?akowski P, Mujica L E, Vehi J. Two approaches to structural damage identification: Model updating vs. soft computing [J]. Journal of Intelligent Material Systems and Structures, 2006, 17(1): 63―79.
[8]  Chen J, Li J. Simultaneous identification of structural parameters and input time history from output-only measurements [J]. Computational Mechanics, 2004, 33(5): 365―374.
[9]  Zhu X Q, Law S S, Damage detection in simply supported concrete bridge structure under moving vehicular loads [J]. Journal of Vibration and Acoustics, 2007, 129(1): 58―65.
[10]  Zhang K, Li H, Duan Z, et al. A probabilistic damage identification approach for structures with uncertainties under unknown input [J]. Mechanical Systems and Signal Processing, 2011, 25(4): 1126―1145.
[11]  Holnicki-Szulc J. Smart technologies for safety engineering [M]. Wiley, Chichester, 2008: 15―30.
[12]  Zhang Q, Jankowski ?ukasz, Duan Z. Identification of coexistent load and damage [J]. Structural Multidisciplinary Optimization, 2010, 41(2): 243―253.
[13]  Zhang Q, Jankowski ?ukasz, Duan Z. Identification of coexistent load and damage based on virtual distortion method [C]// Uhl T, Ostachowica W, Holnicki-Szulc J. Proceedings of the 4th European Workshop on Structural Health Monitoring, Kraków, Poland, 2008: 1121―1128.
[14]  Hansen P. Deconvolution and regularization with Toeplitz matrices [J]. Numerical Algorithms, 2002, 29(4): 323―378.
[15]  Friswell M, Penny J. Crack modelling for structural health monitoring [J]. Structural Health Monitoring, 2002, 1(2): 139―148.

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