| 基于时间反转理论的聚焦Lamb波结构损伤成像 |
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| 引用本文： | 张海燕,孙修立,曹亚萍,陈先华,于建波.基于时间反转理论的聚焦Lamb波结构损伤成像[J].海洋学报,2010,32(10):7111-7119. |
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| 作者姓名： | 张海燕 孙修立 曹亚萍 陈先华 于建波 |
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| 作者单位： | 上海大学通信与信息工程学院, 特种光纤与光接入网省部共建重点实验室, 上海 200072;上海大学通信与信息工程学院, 特种光纤与光接入网省部共建重点实验室, 上海 200072;上海大学通信与信息工程学院, 特种光纤与光接入网省部共建重点实验室, 上海 200072;上海大学通信与信息工程学院, 特种光纤与光接入网省部共建重点实验室, 上海 200072;上海大学通信与信息工程学院, 特种光纤与光接入网省部共建重点实验室, 上海 200072 |
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| 基金项目： | 国家自然科学基金(批准号: 10874110, 10504020)、上海市重点学科(批准号: S30108)和上海市科委重点实验室项目(批准号: 08DZ2231100)资助的课题. |
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| 摘 要： | 从理论和实验上研究了时间反转法在频散和多模式的Lamb波结构健康检测方面的应用.当Lamb波在包含有损伤的板类结构中传播时,损伤的存在表现为一个被动波源.采用分布式传感器网络,基于传递函数的观点,通过推导由损伤这个被动波源产生的时间反转波场幅值的表达式,证实了当观察点位于损伤位置时,时间反转波场的幅值最大.为验证时间反转方法的聚焦效应,提出了一种适合于分布的激励/接收传感器网络的成像方法,该方法可以对损伤定位并近似确定损伤尺寸.结合有限元的实验结果显示了Lamb波检测信号的能量可在损伤处聚焦,表明时间反转
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| 关 键 词： | Lamb波 时间反转 结构损伤成像 聚焦效应 |
Structural damage imaging based on time-reversal theory for focusing of Lamb waves |
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| Zhang Hai-Yan,Sun Xiu-Li,Cao Ya-Ping,Chen Xian-Hua and Yu Jian-Bo.Structural damage imaging based on time-reversal theory for focusing of Lamb waves[J].Acta Oceanologica Sinica (in Chinese),2010,32(10):7111-7119. |
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| Authors: | Zhang Hai-Yan Sun Xiu-Li Cao Ya-Ping Chen Xian-Hua and Yu Jian-Bo |
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| Institution: | School of Communication and Information Engineering, Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200072, China;School of Communication and Information Engineering, Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200072, China;School of Communication and Information Engineering, Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200072, China;School of Communication and Information Engineering, Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200072, China;School of Communication and Information Engineering, Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200072, China |
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| Abstract: | This study presents a theoretical and experimental investigation of the application of the time-reversed concept to dispersive and multimode Lamb waves for health monitoring of plate-like structures. When a Lamb wave signal is excited in a plate-like structure with damage,the damage will serve as a passive wave source. With the transfer function,the focusing in the time-reversal field composed of distributed transducer network is analyzed by deducing the amplitude expression of the time reversal Lamb wave signals. The result demonstrates that time-reversal signal reaches the maximum amplitude when the observation point is located at the damage location. To validate the focusing effect of the time-reversal method,an efficient imaging method suitable for distributed actuator/sensor networks is adopted for locating and approximate sizing of structural damages. Experimental results combined with finite element simulation illustrate that the inspection energy can be focalized on the damage. It indicates that the time-reversal method is an effective way for identifying and locating damage for Lamb wave inspection. |
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| Keywords: | Lamb waves time-reversal structural damage imaging focusing effect |
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