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Journal of Vcibration Testing and System Dynamics 2(3) (2018) 221--237 | DOI:10.5890/JVTSD.2018.09.003

Gang Jiang$^{1}$, Yiming Deng$^{2}$, Lili Liu$^{3}$, Canghai Liu$^{1}$, Zihong Liu$^{1}$, Yong Jiang$^{1}$

$^{1}$ Manufacturing Process Testing Key Lab of the Ministry of Education, Southwest University of Science and Technology, Mianyang, Sichuan, 621010, China

$^{2}$ Nondestructive Evaluation Laboratory, Department of Electrical and Computer Engineering, Michigan State University, East Lansing, MI, 48824, USA

$^{3}$ School of Material Science and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan, 621010, China

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Abstract

In systematic identification for real bridge engineering structural damage evaluation, lack of “negative samples” is the main reason for misjudgment and false classification. Aimed at this problem, the paper proposed a new kinetic-parameters-analysis-based method of damage identification for bridge structures, using both numerical simulation and real experiments under controlled lab conditions. PROE and ADAMS were adopted to build structural models and integrate with simulation experiments under virtual force, requency response data were gathered and used as “simulation datasets”. In real structural experiments, accelerators and advanced signal acquisition equipments were used to collect signals from real structures hit by real force. Signals gathered by equipments ere used as “real datasets”, corresponded with “simulation datasets”. After that, features were extracted from these two kinds of datasets. Authors found that numerical simulation models were not always accurate, while real model had its own advantages and isadvantages. To fill this gap, relationships between simulation and actual measurements were investigated in this paper. Finally, Support Vector Machine (SVM) method was used to perform pattern recognition experiments and showed its good performance on tructure damage identification. The proposed method is scalable and can be extended to a bigger structure, such as the entire bridge faults diagnosis.

Acknowledgments

Authors would like to thank the supports from Innovation Team Key Fund of Sichuan Provincial Department of Education (16TD0016) and Key Project of Science and Technology Plan of Mianyang City (KJ20170507).

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