| 基于虚拟时间反转的高分辨率复合材料板结构损伤成像 |
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| 引用本文： | 蔡建,石立华,袁慎芳.基于虚拟时间反转的高分辨率复合材料板结构损伤成像[J].复合材料学报,2012,29(1):183-189. |
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| 作者姓名： | 蔡建 石立华 袁慎芳 |
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| 作者单位： | 1. 解放军理工大学 工程兵工程学院, 南京 210007;
2. 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(10872217); 国家高技术研究发展计划(863)(2007AA03Z117); 国家自然科学基金重点项目(50830201); 航空科学基金(20090952015) |
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| 摘 要： | 针对传统时间反转(TR)方法消除Lamb波传播时间和操作复杂的问题, 提出了虚拟时间反转(VTR)方法。该方法采用换元激励和接收机制以保留时间信息, 并运用信号运算代替物理TR操作。讨论了基于阶跃激励获取损伤监测路径传递函数的VTR实现过程。提出了基于VTR的高分辨率损伤成像方法。为了降低复合材料各向异性的影响, 在成像中进行了速度修正。实验结果表明, VTR方法能对碳纤维复合材料板中的Lamb波损伤散射波包进行部分再压缩和TR聚焦, 通过本文中成像方法也能清晰显示出板中单个和两个近邻损伤。
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| 关 键 词： | 复合材料 Lamb波 时间反转 损伤成像 分辨率 |
| 收稿时间： | 2010-12-14 |
| 修稿时间： | 2011-04-14 |
High-resolution damage imaging for composite plate structures based on virtual time reversal |
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| CAI Jian,SHI Lihua,YUAN Shenfang.High-resolution damage imaging for composite plate structures based on virtual time reversal[J].Acta Materiae Compositae Sinica,2012,29(1):183-189. |
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| Authors: | CAI Jian SHI Lihua YUAN Shenfang |
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| Affiliation: | 1. Engineering Institute of Engineering Corps, PLA University of Science and Technology, Nanjing 210007, China;
2. College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China |
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| Abstract: | According to the problems that traditional time reversal (TR) method eliminates propagation time of Lamb waves and its procedure is complicated, a virtual time reversal (VTR) method is presented. In the method, changing-element exciting and receiving mechanism is adopted to reserve time information and the TR procedure is replaced by the signal operations. The realization involving acquiring transfer functions of damage detecting path under step pulse excitation is discussed. A high-resolution damage imaging method based on VTR is developed. To reduce the anisotropic effect in composite plates, velocity correction is carried out during the imaging. The experimental results show that damage scattered wavepackets of Lamb waves in the carbon fiber composite plate can be partly recompressed and time reversal focused by VTR. Both the signal damage and dual adjacent ones in the plate are clearly displayed by the proposed imaging method. |
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| Keywords: | composite structure Lamb waves time reversal damage imaging resolution |
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