基于时间反演的混凝土结构多维损伤成像监测方法研究

项目名称： 基于时间反演的混凝土结构多维损伤成像监测方法研究

项目编号： No.51278084

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 建筑科学

项目作者： 宋钢兵

作者单位： 大连理工大学

项目金额： 85万元

中文摘要： 混凝土结构内部复杂的环境对超声波易产生非均匀、多杂波、多散射的干扰，致使采用超声波损伤探测技术探测的目标位置发生偏失，严重影响了测量精度。时间反演（Time Reversal，TR）技术能够使信号自适应地在检测区域中聚焦成像，进而可以实现待探测目标的精确定位，在混凝土内部结构这种非均匀环境的损伤监测中具有广阔的应用前景。本项目拟将时间反演技术与智能骨料传感器系统相结合，开发一种基于混凝土结构损伤成像的智能实时监测系统，内容包括时间反演探测系统的探测单元在混凝土中的排布方式，基于时间反演技术的混凝土裂缝目标探测技术和成像技术，基于时间反演技术的混凝土成像监测软件，多压电陶瓷片叠加技术的第三代智能骨料，以及成像系统硬件系统的研究和开发。本项目的完成，可为大型混凝土结构提供一个高效、智能、精确、实时的新型监测系统及解决方案。

中文关键词： 时间反演；健康监测；压电材料；主动式传感；成像方法

英文摘要： Due to the inhomogeneous, over-cluttering, high-scattering characteristics of concrete structures, the direction and the velocity of the Ultrasonic wave propagation always change, which results in target deviation when using the concrete image-based damage detection technique. TR (Time Reversal) technology has the advantage of adaptively focusing detection signal on the crack in the detection area. The auto-focusing characteristic of TR technology has the capacity of exactly locating the target. Therefore, the TR technology is very much suited for damage detection in inhomogeneous environment, such as concrete structures. This project will integrate the time reversal technology and embedded piezoceramic smart aggregate transducers to develop an innovative imaging based real-time health monitoring system for concrete structures. This innovative project includes the following major research components: 1) studies on arrangement of the piezoceramic transducer arrays, 2) the time reversal based the crack detection and imaging algorithms, 3) software development, 4）development of a new generation of smart aggergates with piezoceramic stack, and 5) comprehensive testng. This project provides a novel damage imaging based structural health monitoring approach that is highly efficient, intelligent, accutate, and real t

英文关键词： Time reversal；Structure Health monitoring；Piezoelectric material；Active sensor；Imaging method