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A platform for research: civil engineering, architecture and urbanism
Electrical Analysis of Smart Film-Based Crack-Width Monitoring in Bridge Infrastructure System
A crack monitoring method based on a smart film crack sensor was proposed by the authors to monitor different characteristics of cracks such as initiation time, length, propagation, shape, and location. However, in engineering practice, data changes frequently after running for about half a year; it does not appear in the earlier period. Aiming at the problem, this paper focuses on electrical analysis in smart film crack monitoring. It is found that coupling capacitance increases with dielectric constant of enameled wire of the sensor, thus leading to the increase of coupling voltage and affecting the judgment. Therefore, a model is formulated to infer the relationship among the frequency of detecting signal, parasitic capacitance, and coupling interference voltage. On this basis, a smart film crack sensor is redesigned and the anti-interference circuit is added to hardware; the low-frequency detecting signal and the custom judgment mechanism are adopted to lower coupling voltage in the software. In consideration of improving the reliability of data transmission, a check mechanism is employed. Meanwhile, the improved sensor is testified to by experiments and applied to Chongqing Lijiatuo Yangtze River Bridge.
Electrical Analysis of Smart Film-Based Crack-Width Monitoring in Bridge Infrastructure System
A crack monitoring method based on a smart film crack sensor was proposed by the authors to monitor different characteristics of cracks such as initiation time, length, propagation, shape, and location. However, in engineering practice, data changes frequently after running for about half a year; it does not appear in the earlier period. Aiming at the problem, this paper focuses on electrical analysis in smart film crack monitoring. It is found that coupling capacitance increases with dielectric constant of enameled wire of the sensor, thus leading to the increase of coupling voltage and affecting the judgment. Therefore, a model is formulated to infer the relationship among the frequency of detecting signal, parasitic capacitance, and coupling interference voltage. On this basis, a smart film crack sensor is redesigned and the anti-interference circuit is added to hardware; the low-frequency detecting signal and the custom judgment mechanism are adopted to lower coupling voltage in the software. In consideration of improving the reliability of data transmission, a check mechanism is employed. Meanwhile, the improved sensor is testified to by experiments and applied to Chongqing Lijiatuo Yangtze River Bridge.
Electrical Analysis of Smart Film-Based Crack-Width Monitoring in Bridge Infrastructure System
Wang, Shuliang (author) / Zhang, Benniu (author) / Yang, Guang (author) / Ji, Changquan (author) / Zhou, Zhixiang (author)
2015-07-28
Article (Journal)
Electronic Resource
Unknown
Electrical Analysis of Smart Film-Based Crack-Width Monitoring in Bridge Infrastructure System
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