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总览 评价 骆英 ， 王自平 * ， 李忠芳 （ 江苏大学理学院； ） 摘要： 为了提高对混凝土结构裂缝的检测能力，利用全波形声发射技术记录了预应力混凝土梁在三点弯曲荷载下的整个破坏过程的声发射信号，采用谱分析及Hilbert-Huang变换对AE全波形数据进行了分
骆英， 王自平*， 李忠芳
（
江苏大学理学院； ）
摘要：
为了提高对混凝土结构裂缝的检测能力，利用全波形声发射技术记录了预应力混凝土梁在三点弯曲荷载下的整个破坏过程的声发射信号，采用谱分析及Hilbert-Huang变换对AE全波形数据进行了分析处理及定位研究。并引入在工程物探中应用广泛的叠加偏移成像（Stack migration imaging, SMI）技术，运用多驱动/传感方式对混凝土结构的不同类型的预埋内部裂缝进行检测，得到了裂缝尺寸和位置的成像。将SMI技术与新型声发射传感技术相结合，采用自行研制的正交异性压电复合材料（Orthotropic piezoelectric composite material, OPCM）换能器代替传统的单一压电陶瓷换能器，应用到土木工程结构健康监测系统（Structure health monitoring system, SHMS）中，有效地克服了监测过程中结构构件侧面反射信号的干扰难题。试验结果表明采用OPCM换能器使得SMI技术与AE传感技术应用于SHMS成为可能，从而为结构SHMS的研究奠定必要的理论及应用基础。
关键词：
声发射；叠加偏移成像；OPCM；Hilbert-Huang变换；结构健康监测
Luo Ying， Wang Ziping*， Li Zhongfang
（
Faculty of Science, Jiangsu University； ）
Abstract：
In order to improve the detection ability of concrete, a series of prestressed concrete beams were loaded in three points bending until failure. The waveform acoustic emission (AE) signals were recorded. Spectral analysis and Hilbert-Huang transform are carried out to analysis and locate using the AE waveform data. Stack migration imaging (SMI) technology of widely used in geophysics has recommended in the paper. The imaging of the damage dimension and location has gotten. The SMI technology combined with the rising acoustic emission technique, using the orthotropic character of the orthotropic piezoelectric composite material (OPCM) transducers made by ourselves instead of the single piezoelectric ceramic transducers, applies to the structure health monitoring of the concrete. With the OPCM units, the interference of the signal of the echo which coming from the side of the concrete structures are avoid effectively. The research shows that waveform AE signals can be used to disclose the characteristics of the different damage levels of the structure under loading in real time and the SMI technology can be imaged better to the cracks. Accordingly, it makes a necessary theory and application basic for the SHMS.
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