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结构健康监测中AE与SMI技术及理论研究
发表时间：2010-08-15 浏览量：1632 下载量：455
| 全部作者： | 骆英，王自平，李忠芳 |
| 作者单位： | 江苏大学理学院，机械工业机械结构损伤检测评估技术重点实验室 |
| 摘 要： | 为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整个破坏过程的声发射信号，采用谱分析及希尔伯特黄变换（Hilbert�Huang transform, HHT）对声发射（acoustic emission，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： | 固体力学；结构健康监测; 声发射；叠加偏移成像；正交异性压电复合材料；希尔伯特-黄变换 |
| Title： | Study on the structure health monitoring based on AE and SMI technology and theory |
| Author： | LUO Ying, WANG Ziping, LI Zhongfang |
| Organization： | Chinese Machinery Industry Key Laboratory for Mechanical Structure Damage Detection Technology, 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. |
| Key words： | solid mechanics; structure health monitoring; acoustic emission; stack migration imaging; orthotropic piezoelectric composite material (OPCM); Hilbert�Huang transform |
| 发表期数： | 2010年8月第15期 |
| 引用格式： | 骆英，王自平，李忠芳. 结构健康监测中AE与SMI技术及理论研究[J]. 中国科技论文在线精品论文，2010，3（15）：1594-1600. |
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