Simulation study on ultrasonic tomography for grouted reinforced concrete by finite element

作     者：朱自强 喻波 李亚楠 肖嘉莹 周勇 ZHU Zi-qiang;YU Bo;LI Ya-nan;XIAO Jia-ying;ZHOU Yong

作者机构：School of Geosciences and Info-Physics EngineeringCentral South University Hunan Chaji Expressway Construction and Development Co.Ltd. College of Resource and Environment and TourismHunan University of Arts and Science 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2015年第22卷第7期

页      面：2791-2799页

核心收录：

学科分类：0810[工学-信息与通信工程] 07[理学] 08[工学] 0806[工学-冶金工程] 081304[工学-建筑技术科学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0813[工学-建筑学] 0703[理学-化学] 0702[理学-物理学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：Project(31200748)supported by the National Natural Science Foundation of China 

主　　题：钢筋混凝土结构 超声波 成像仿真 有限元 重建算法 层析 锚固 亥姆霍兹方程 

摘      要：A finite element reconstruction algorithm for ultrasound tomography based on the Helmholtz equation in frequency domain is presented to monitor the grouting defects in reinforced concrete structures.In this algorithm,a hybrid regularizations-based iterative Newton method is implemented to provide stable inverse solutions.Furthermore,a dual mesh scheme and an adjoint method are adopted to reduce the computation cost and improve the efficiency of reconstruction.Simultaneous reconstruction of both acoustic velocity and attenuation coefficient for a reinforced concrete model is achieved with multiple frequency data.The algorithm is evaluated with numerical simulation under various practical scenarios including varied transmission/receiving modes,different noise levels,different source/detector numbers,and different contrast levels between the heterogeneity and background region.Results obtained suggest that the algorithm is insensitive to noise,and the reconstructions are quantitatively accurate in terms of the location,size and acoustic properties of the target over a range of contrast levels.