基于三角波定位监督的分布式CFRP-OFBGs早期损伤检测方法

Early damage detection method based on triangular localization monitoring in distributed CFRP-OFBG plates

在分布式碳纤维复合材料-光纤光栅(CFRP-OFBGs)复合板的早期损伤监测中,传统方法如最大检测算法MDA(Maximum detection algorithm,MDA)检测效果较好,但计算空间与时间复杂度都很高,不适用于工程计算.因此,提出了一种新的快速三角波监督定位策略.该策略基于相同的反射光谱波长偏移,通过检测三角边界来获得近似结果.通过CFRP-OFBGs复合板压力实验,比较了本算法与最大检测算法在检测精度和准确度上的不同.结果表明:在相同实验环境和参数下,虽然精度下降约15%,但不影响识别准确度.此外,相较MDA算法,三角波监督检测策略能在CPU执行时间上大约快1倍,因而是一种相对经济有效的检测模型,能满足大型工程损伤检测需求.

Optical Fiber Bragg Grating(OFBG)temperature and pressure measurement can be used as a strain sensor in the Carbon Fiber Reinforced Plastics(CFRP)for engineering applications.The traditional method such as Maximum Detection Algorithm(MDA)has good detection effect,but the complexity of computing space and time is high.Therefore,it is not suitable for engineering computing.To overcome this problem,we developed a new fast triangular wave monitor positioning strategy using distributed carbon fiber reinforced polymer CFRP-OFBG plates.The algorithm was developed on the same reflection spectral wavelengths,but only to detect triangle border in CFRP-OFBG plate pressure processing.We compared the original MDA algorithm under this strategy with precision and accuracy under the same experimental environment and parameters.The experiment results show that while the relative accuracy is reduced about 15%,it does not affect the recognition accuracy.Furthermore,triangular wave localization monitoring strategy is twice as fast as the traditional MDA algorithm in CPU running time.It shows that this method can meet the needs of engineering application with economic effect.