Fiber Bragg grating (FBG) is applied for the impact-related experiments of carbon fiber reinforced plastics (CFRP) and impact monitoring system is built.FBG sensors are stuck on the CFRP to setup network, impact response signal measured by same FBG is analyzed for different impact location.The resonant frequency of CFRP is 53Hz and 100Hz, which amphtude of different resonant frequency is changed with location of impact.When CFRP laminate is impact, impact response signals using FBG sensors network is analyzed by wavelet packet decomposition and wavelet packet energy spectrum is obtained.The results show the sixth order wavelet packet energy monitored by FBG sensors change obviously and the energy not only is related to distance from impact point to FBG sensor but also is related to the angle between impact point and axial of FBG sensor.The research provides a practical reference in dynamic monitoring of CFRP dynamic monitoring field.%提出了一种用光纤光栅传感器监测CFRP结构冲击载荷的方法,构建了冲击监测系统.将FBG传感器粘贴于CFRP试件表面构成传感网络,针对不同冲击点,同一传感器监测的冲击响应信号进行分析,CFRP试件的一阶、二阶谐振频率为53 Hz、100 Hz,不同谐振频率对应的幅值随冲击点的改变而不同.冲击CFRP试件,对FBG传感网络感知的冲击响应信号进行小波包分解,获得各传感器的小波包能量谱图.结果表明传感器信号的第6阶小波包能量变化明显,能量大小与冲击点和传感器之间的距离及其夹角有关.研究结果将为CFRP结构的动态监测领域提供了实验参考.
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