Structural Damage Identification in Homogeneous and Heterogeneous Structures Using Beamforming
Structural Damage Identification in Homogeneous and Heterogeneous Structures Using Beamforming
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DOI：
10.1177/1475921705052276
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发表时间：
2005-06
期刊：
影响因子：
--
通讯作者：
S. Sundararaman;D. Adams;Elias J. Rigas
中科院分区：
文献类型：
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作者：
S. Sundararaman;D. Adams;Elias J. Rigas
在本研究中，由相控传感器或执行器阵列组成的波束形成器被用于均匀和非均匀结构部件的无损评估。波束成形可用于检测、定位和量化损坏，方法是对来自传感器阵列和/或执行器阵列的抽头信号在窄频带内适当地施加权重和时间或相位延迟，以获得所需的方向灵敏度和最佳阵列增益。讨论了波束形成和波传播的一些方面，作为实验研究的前奏。相控阵的设计考虑也进行了检查。采用基于弗罗斯特约束和导频信号的自适应技术证明了自适应波束形成优于传统波束形成的优点。从钢和复合材料板的数据分析使用传播弹性波和相控阵的传感器和/或执行器。损伤可以表现为阻抗的局部变化，可以通过使用传播弹性波来诊断，因为它们对阻抗的微小变化很敏感，并且不需要大量的输入/输出换能器。通过比较与损伤和基线数据相关的指向性模式，对传感器和/或执行器阵列进行波束成形，以表征钢和复合材料板的损伤。
In this study, beamformers consisting of phased sensor or actuator arrays are used in the nondestructive evaluation of homogeneous and heterogeneous structural components. Beamforming can be used to detect, locate, and quantify damage by suitably applying weights and time or phase delays to the tapped signals from a sensor array and/or actuator array in a narrow frequency band to obtain the desired directional sensitivities and optimal array gains. Some aspects about beamforming and wave propagation are discussed as a prelude to the experimental investigation. Design considerations for the phased arrays are also examined. The advantages of using adaptive over conventional beamforming are demonstrated with Frost constraint- and pilot signal-based adaptive techniques. Data from steel and composite plates are analyzed using propagating elastic waves and phased arrays of sensors and/or actuators. Damage, which can be characterized as a local change in impedance, is diagnosed by using propagating elastic waves as they are sensitive to small changes in impedance and do not require a large number of input/output transducers. Beamforming of sensor and/or actuator arrays is carried out to characterize damage in steel and composite plates by comparing the directivity patterns associated with the damage and baseline data.