Abstract
The strain of bridges under traffic loads is time-varying and of small amplitude (∼10−6), which is a type of cumulative response and needs long-term continuous monitoring. To precisely capture the time-varying responses, a dynamic strain triboelectric nanogenerator (TENG) sensor with superior response capability, sensitivity, self-powered, and long-term stability is proposed in this paper. An analytical correlation between the structural strain response signal and the detected electrical signal is established for long-term continuous quantitative strain measurements based on the principles of contact electrification and electrostatic induction. A series of experiments are conducted to investigate the output performance of the proposed lateral-sliding mode TENG sensors. The results reveal that, with the loading condition with frequencies lower than 10 Hz, the time-varying strain responses of the steel bridge within the range of 3 to 150 microstrains can also be detected with high precision of 0.1 microstrains. And it achieves long-term stability after 10000 loading cycles compared with commercial sensors. The proposed novel sensing theory and method based on TENG technology can be applied as a new alternative approach for monitoring realtime structural strain information quantitatively with general applicability and feasibility for bridges.
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This work was supported by the National Key R&D Program of China (Grant No. 2018YFB1600200), the National Natural Science Foundation of China (Grant Nos. 52122801, 11925206, and 51978609), and Zhejiang Provincial Natural Science Foundation for Distinguished Young Scientists (Grant No. LR20E080003).
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Zhang, H., Huang, K., Zhou, Y. et al. A real-time sensing system based on triboelectric nanogenerator for dynamic response of bridges. Sci. China Technol. Sci. 65, 2723–2733 (2022). https://doi.org/10.1007/s11431-022-2092-x
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DOI: https://doi.org/10.1007/s11431-022-2092-x