Wang Hua-Ping, Wu Yi-Bin, Chen Cong, Zhang Hu-Yuan, Jiang Hao, Zhang Xue-Mei, Xu Xiang-Yang
School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China.
Key Lab of Mechanics on Disaster and Environment in Western China, Lanzhou University, Ministry of Education, Lanzhou 730000, China.
Sensors (Basel). 2022 Aug 24;22(17):6377. doi: 10.3390/s22176377.
The in-situ health condition of carbon fiber reinforced polymer (CFRP) reinforced structures has become an important topic, which can reflect the structural performance of the retrofitted structures and judge the design theory. An optical fiber-based structural health monitoring technique is thus suggested. To check the effectiveness of the proposed method, experimental testing on smart CFRP reinforced steel beams under impact action has been performed, and the dynamic response of the structure has been measured by the packaged FBG sensors attached to the surface of the beam and the FBG sensors inserted in the CFRP plates. Time and frequency domain analysis has been conducted to check the structural feature of the structures and the performance of the installed sensors. Results indicate that the packaged Fiber Bragg Grating (FBG) sensors show better sensing performance than the bare FBG sensors in perceiving the impact response of the beam. The sensors embedded in the CFRP plate show good measurement accuracy in sensing the external excitation and can replace the surface-attached FBG sensors. The dynamic performance of the reinforced structures subjected to the impact action can be straightforwardly read from the signals of FBG sensors. The larger impact energies bring about stronger impact signals.
碳纤维增强聚合物（CFRP）增强结构的原位健康状况已成为一个重要课题，它可以反映加固结构的结构性能并评判设计理论。因此，提出了一种基于光纤的结构健康监测技术。为检验该方法的有效性，对智能CFRP增强钢梁在冲击作用下进行了试验测试，并通过粘贴在梁表面的封装光纤布拉格光栅（FBG）传感器和插入CFRP板中的FBG传感器测量了结构的动态响应。进行了时域和频域分析，以检验结构的结构特征和所安装传感器的性能。结果表明，在感知梁的冲击响应方面，封装的光纤布拉格光栅（FBG）传感器比裸FBG传感器具有更好的传感性能。嵌入CFRP板中的传感器在感知外部激励方面显示出良好的测量精度，并且可以替代粘贴在表面的FBG传感器。从FBG传感器的信号中可以直接读取受冲击作用的增强结构的动态性能。较大的冲击能量会带来更强的冲击信号。
