| 基于频率-波数域偏移的损伤被动成像识别研究 |
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| 引用本文： | 严刚,周丽.基于频率-波数域偏移的损伤被动成像识别研究[J].固体力学学报,2011(Z1). |
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| 作者姓名： | 严刚 周丽 |
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| 作者单位： | 南京航空航天大学飞行器结构力学与控制教育部重点实验室结构强度研究所; |
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| 基金项目： | 国家自然科学基金(10572058); 航空科学基金(2008ZA52012); 南京航空航天大学基本科研业务费专项(NS2010027)资助 |
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| 摘 要： | 提出了一种应用Lamb波对板结构中多部位损伤源进行被动成像识别的方法.基于Mindlin板理论,推导了板结构中弥散性Lamb波频率-波数域的快速偏移方法,结合爆炸成像原理,对损伤源发出的Lamb波信号进行回传成像.由于损伤源的发生时刻未知,将使用不同假设发生时刻(即不同长度)的Lamb波信号生成一系列图像,通过最小熵原理从中确定最优图像,识别出损伤源的位置和发生时刻.进行了数值仿真研究来表明所提出方法的有效性.
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| 关 键 词： | 频率-波数域偏移 多部位损伤源 成像识别 Mindlin板理论 最小熵原理 |
PASSIVE IMAGING AND IDENTIFICATION OF DAMAGES USING MIGRATION TECHNIQUE IN FREQUENCY-WAVENUMBER DOMAIN |
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| Gang Yan Li Zhou.PASSIVE IMAGING AND IDENTIFICATION OF DAMAGES USING MIGRATION TECHNIQUE IN FREQUENCY-WAVENUMBER DOMAIN[J].Acta Mechnica Solida Sinica,2011(Z1). |
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| Authors: | Gang Yan Li Zhou |
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| Institution: | Gang Yan Li Zhou(MOE Key Lab of Structure Mechanics and Control for Aircraft,Institute of Structures and Strength,Nanjing University of Aeronautics and Astronautics,Nanjing,210016) |
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| Abstract: | This paper proposes an approach for passively imaging and identifying of multiple damage sources in plate-like structure using Lamb waves.Based on Mindlin plate theory,the fast frequency-wavenumber domain migration technique for dispersive Lamb wave is developed.Combined with the exploding imaging condition,damage sources can be imaged by back-propagating their emitted Lamb wave signals.Since the occurrence time of the damage sources is unknown,a series of images are produced by the Lamb wave signals with d... |
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| Keywords: | frequency-wavenumber domain migration multiple damage sources imaging and identification Mindlin plate theory minimum entropy principle |
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