United States Department of Transportation
i
Functional Composite-Based Wireless Sensing Platform for Bridge Structures
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2024-09-01
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[PDF-3.58 MB]
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Edition:Final Report January 2020 – June 2024
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Abstract:The main objective of this research is to develop and deploy a wireless crack sensing system that can measure and monitor cracks for both concrete and steel bridge structures. This system will contain the sensing unit, wireless data transmitting system, as well as a data processing unit. The sensing unit will consist of single or arrays of advanced thin film-based sensing nodes that are capable to measuring crack induced strains in bridge structures. This thin film sensing node contains soft polymer film (polyvinylidene difluoride, PVDF) embedded with conductive nanoparticles (graphene) or atomically thin films. Both the Poisson’s effect and contact mechanism will be considered to covert the strain to electrical resistance of the sensing unit. This sensing unit is also connected to a wireless transmitting system to broadcast the signal wirelessly. The wireless transmitting system utilizes a blue-tooth technology that can enable the sensing unit to broadcast electronic signals in terms of electrical resistance. These signals were received by a mobile device (laptop or cellphone) that can convert the electrical resistance information into the measured stains. These measurements are processed using the data processing unit. The data processing unit will receive the electrical resistance data and convert it into measured strains. The machine learning approach was also taken to train the software to be able to automatically detect the abnormalities in the measured strain for critical crack growth detection.
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