| 基于Shannon 复数小波的复合材料结构时间反转聚焦多损伤成像方法 |
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| 引用本文： | 邱雷,袁慎芳,张逍越,王强,张炳良,杨伟伟.基于Shannon 复数小波的复合材料结构时间反转聚焦多损伤成像方法[J].复合材料学报,2010,27(2):101-107. |
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| 作者姓名： | 邱雷 袁慎芳 张逍越 王强 张炳良 杨伟伟 |
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| 作者单位： | 南京航空航天大学,航空宇航学院,南京,210016 |
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| 基金项目： | 国家自然科学基金重点项目，国家自然科学基金，国家高技术研究发展计划(863计划)，南京航空航天大学博士生创新基金 |
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| 摘 要： | 研究了一种基于压电传感器阵列和主动Lamb 波的结构损伤成像方法，有助于克服Lamb 波在板结构中、特别是在复合材料板结构中存在的频散、多种模式及模式转换的现象给结构健康监测带来的困难。分析了结构多损伤散射信号的时间反转聚焦原理，在此基础上提出了一种基于Shannon 复数小波和时间反转聚焦的信号合成成像方法。该方法中，确定Lamb 波响应信号的到达时刻是信号能够准确聚焦的关键因素之一。提出了利用Shannon 复数小波变换计算Lamb 波响应信号到达时刻的方法。在碳纤维复合材料板结构上对整套信号合成成像方法进行了验证。研究结果表明，该方法能够有效地对同一个监测区域中的多个损伤进行成像定位。相对于30 cm ×30 cm 的监测区域，定位误差不超过2 cm。该方法有助于结构健康监测技术的工程应用。
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| 关 键 词： | 结构健康监测 复合材料 时间反转 Shannon 复数小波 信号合成 损伤成像 |
| 收稿时间： | 2009-05-13 |
| 修稿时间： | 2009-08-12 |
Shannon complex wavelet and time reversal focusing based multi-damage imaging method on composite structures |
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| QIU Lei,YUAN Shenfang,ZHANG Xiaoyue,WANG Qiang,ZHANG Bingliang,YANG Weiwei.Shannon complex wavelet and time reversal focusing based multi-damage imaging method on composite structures[J].Acta Materiae Compositae Sinica,2010,27(2):101-107. |
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| Authors: | QIU Lei YUAN Shenfang ZHANG Xiaoyue WANG Qiang ZHANG Bingliang YANG Weiwei |
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| Affiliation: | (College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China) |
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| Abstract: | A piezoelectric sensors array and active Lamb wave based structural damage imaging method was researched which was helpful to overcome the problems of damage monitoring with multi-mode and mode convention of Lamb wave propagation on plate-like structures, especially on those of composite materials. The principle of time reversal focusing of multi-damage scattering signals was analyzed. Based on this principle, a signal synthesis imaging method based on Shannon complex wavelet and time reversal focusing was proposed. In this method, calculation of time-of-arrival of Lamb wave response signals was an important issue to signal synthesis. A Shannon complex wavelet based time-of-arrival of Lamb wave response signals calculating method was proposed. The signal synthesis imaging method was validated on a carbon fiber composite plate. The result shows that this method could estimate the positions of multi-damages in the same monitoring area efficiently. Compared with the monitoring area of 30 cm ×30 cm, the damage localization errors are no more than 2 cm. It can promote the practical applications of SHM technology. |
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| Keywords: | structural health monitoring composites time reversal Shannon complex wavelet signal synthesis damage imaging |
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