摘要
基于超声导波的损伤检测与定位方法被广泛应用于各种工程常见结构,然而复合材料的各向异性加剧了在其中传播的导波信号的复杂度,使得实际检测时容易出现成像区域过大、有伪像等定位精度不足的问题。本文基于延时叠加(Delay-and-Sum,DAS)原理和麻雀搜索优化算法(Sparrow Search Algorithm,SSA),设计了基于散射信号飞行时间的适应度函数,将损伤成像问题转换成散射源搜索问题,提出了一种基于超声导波和DAS-SSA散射源搜索的复合材料板分层损伤定位方法。通过适应度函数对麻雀种群分布进行评估,进一步迭代搜索,逐步逼近最有可能的散射源位置,最终以麻雀聚集处表征定位的损伤区域。实验结果表明,相较于传统成像方法,该方法的定位区域显著缩减,定位精度也有明显提升。
Ultrasonic guided wave-based damage detection and localization methods are widely applied in vari-ous engineering structures.However,the anisotropy of composite materials increases the complexity of guided wave propagation,often resulting in oversized imaging areas and false artifacts,which compromise localization accuracy.In this study,a novel damage localization method for delaminations in composite plates is proposed,integrating de-lay-and-sum(DAS)principles with the sparrow search algorithm(SSA).By designing a fitness function based on the time of flight(ToF)of scattered signals,the damage imaging problem is transformed into a scattering source search problem.The fitness function evaluates the sparrow population distribution,iteratively refining the search process to approximate the most probable scattering source locations.The damage region is ultimately represented by the areas of sparrow aggregation.Experimental results demonstrate that,compared to traditional imaging methods,the proposed approach significantly reduces the localization area and enhances accuracy.
作者
叶晨璐
周邵萍
罗志
李沁霏
YE Chenlu;ZHOU Shaoping;LUO Zhi;LI Qinfei(Key Laboratory of Pressure System and Safety,Ministry of Education,East China University of Science and Technology,Shanghai 200237,China)
出处
《复合材料科学与工程》
北大核心
2026年第2期20-27,共8页
Composites Science and Engineering
基金
国家自然科学基金(52175137)
国家重点研发计划(2021YFB4000800)。
关键词
超声导波
复合材料
分层损伤
散射源搜索
ultrasonic guided wave
composite materials
delamination damage
scattering source search
