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Appl. Sci. 2017, 7(4), 362; doi:10.3390/app7040362

Experimental Damage Identification of a Model Reticulated Shell

1
School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China
2
Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China
3
School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, China
4
Electronics and Information School, Yangtze University, Jingzhou 434023, China
*
Author to whom correspondence should be addressed.
Academic Editor: Stefano Invernizzi
Received: 17 February 2017 / Revised: 29 March 2017 / Accepted: 29 March 2017 / Published: 6 April 2017
(This article belongs to the Special Issue Structural Health Monitoring (SHM) of Civil Structures)
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Abstract

The damage identification of a reticulated shell is a challenging task, facing various difficulties, such as the large number of degrees of freedom (DOFs), the phenomenon of modal localization and transition, and low modeling accuracy. Based on structural vibration responses, the damage identification of a reticulated shell was studied. At first, the auto-regressive (AR) time series model was established based on the acceleration responses of the reticulated shell. According to the changes in the coefficients of the AR model between the damaged conditions and the undamaged condition, the damage of the reticulated shell can be detected. In addition, the damage sensitive factors were determined based on the coefficients of the AR model. With the damage sensitive factors as the inputs and the damage positions as the outputs, back-propagation neural networks (BPNNs) were then established and were trained using the Levenberg–Marquardt algorithm (L–M algorithm). The locations of the damages can be predicted by the back-propagation neural networks. At last, according to the experimental scheme of single-point excitation and multi-point responses, the impact experiments on a K6 shell model with a scale of 1/10 were conducted. The experimental results verified the efficiency of the proposed damage identification method based on the AR time series model and back-propagation neural networks. The proposed damage identification method can ensure the safety of the practical engineering to some extent. View Full-Text
Keywords: reticulated shell; damage detection; time series modeling; Levenberg–Marquardt algorithm; impact experiment; neural networks reticulated shell; damage detection; time series modeling; Levenberg–Marquardt algorithm; impact experiment; neural networks
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Xu, J.; Hao, J.; Li, H.; Luo, M.; Guo, W.; Li, W. Experimental Damage Identification of a Model Reticulated Shell. Appl. Sci. 2017, 7, 362.

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