摘要
提出一种基于形态分形理论的压电超声无损检测方法,对冲击荷载作用下混凝土结构损伤裂纹发展全过程进行检测和评估。创新之处主要表现在以下几个方面:首先,将压电超声检测方法应用到冲击荷载作用下混凝土损伤裂纹发展全过程,并对采集到的压电时域信号随试件裂纹发展的变化规律进行了深入分析;其次,关键创新之处在于构建了基于形态分形理论的结构损伤检测模型,以识别混凝土损伤裂纹发展程度。研究结果表明:形态学腐蚀计算能有效地放大不同试验信号波峰特征陡度的差异,基于盒维数的特征提取方法,可提取波形更加全面自相似性的特征,与神经网络模型结合,识别效果较好,准确率可达90%以上。
A novel nondestructive piezoelectric ultrasonic testing method grounded in morphological fractal theory is presented,aimed at the detection and assessment of the entire progression of damage cracks in concrete structures under the influence of impact loads.The innovations are manifested in several key areas:Initially,the piezoelectric ultrasonic testing method is applied throughout the comprehensive process of damage crack development in concrete subjected to impact loads,with a thorough analysis of the variations in piezoelectric time-domain signals as related to the progression of specimen cracks;a pivotal innovation lies in the establishment of a structural damage monitoring model based on morphological fractal theory,designed to identify the extent of damage crack development in concrete.Results demonstrate that morphological erosion computation effectively amplifies the differences in the steepness of wave peak characteristics across various experimental signals.Furthermore,the feature extraction method based on box-counting dimension allows for a more comprehensive extraction of waveform self-similarity features.When combined with a neural network model,this approach yields a commendable identification performance.The accuracy rate exceeds 90%.
作者
雷凡
夏萃
钟汉清
张川
LEI Fan;XIA Cui;ZHONG Hanqing;ZHANG Chuan(Jiangxi Highway Research and Design Institute Co.,Ltd.,Nanchang 330000,China;East China Jiaotong University,Nanchang 330013,China;Southwest Jiaotong University,Chengdu 611756,China)
出处
《混凝土》
北大核心
2025年第10期66-71,共6页
Concrete
基金
西省交通运输厅科技项目(2023H0018)
国家自然科学基金青年科学基金(5220840)。
关键词
波传播法
压电传感技术
模型试验
形态分形理论
wave propagation method
piezoelectric sensing technology
model experiment
morphological fractal theory
