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A comb transducer model for guided wave NDE

机译：导波无损检测的梳状换能器模型

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A countless number of guided wave modes at particular frequencies could be selected for a particular NDE problem, each point producing special sensitivities by way of wave structure across the thickness of the component being studied and alsospecific penetration powers as a result of interface and surface displacement values and subsequent energy leakage into neighboring media. The mode and frequency choice has a strong influence on NDE and flaw detection, classification and sizing potentialas well as an ability to propagate guided waves over long distances, despite the presence of coatings and other surrounding media.The approach to mode and frequency selection is therefore crucial, which can ultimately be based on theoretical and/or experimental means. One aspect of a theoretical approach beyond dispersion curve analysis includes theory of elasticity computations ofdisplacement distributions across a structure. Focus can be on achieving in-plane or out-of-plane optimal values on a surface or at a specific location inside a structure in an attempt at flaw analysis or improved penetration power. From an experimentalpoint of view, an angle beam transducer at a specific angle can be used to achieve a particular phase velocity value. Unfortunately, the presence of a phase velocity spectrum due to a transducer source influence, size and velocity pattern, as well as thefrequency spectrum itself, often limits the ability to specifically achieve the particular mode and frequency of choice. Multiple modes can be obtained.An alternate transducer choice to the angle beam transducer can be a multiple element array or comb based on various design choices of element size, spacing and pulsing schedules to produce specific modes and frequencies. The purpose of this paper is topresent a model and subsequent solution to a boundary value problem that can evaluate the source influence as a function of the comb transducer design parameters. Advantages of the comb transducer, the mathematical model and analysis, and sampleexperimental results are all presented in the paper along with an insight into future directions.
机译：对于特定的NDE问题，可以选择在特定频率下的无数导波模式，每个点都会通过所研究部件厚度上的波结构以及界面和表面位移值的结果而产生特定的穿透力，从而产生特殊的灵敏度。以及随后的能量泄漏到邻近介质中。尽管存在涂层和其他周围介质，但模式和频率的选择对NDE和探伤，分类和定型潜力以及远距离传播导波的能力都有很大影响，因此选择模式和频率的方法是至关重要，最终可以基于理论和/或实验手段。除色散曲线分析之外，一种理论方法的一个方面包括跨结构位移分布的弹性计算理论。重点可以是在表面或结构内部特定位置实现平面内或平面外最佳值，以尝试进行缺陷分析或提高穿透力。从实验的角度来看，可以使用特定角度的角波束传感器来获得特定的相速度值。不幸的是，由于换能器源的影响，尺寸和速度模式以及频谱本身而导致的相速度谱的存在，常常限制了专门实现选择的特定模式和频率的能力。可以获得多种模式。对于角射束换能器，替代的换能器选择可以是多元件阵列或梳齿，其基于元件尺寸，间距和脉冲时间表的各种设计选择以产生特定的模式和频率。本文的目的是提出一个边界值问题的模型和后续解决方案，该问题可以根据梳状换能器设计参数来评估源的影响。本文介绍了梳状换能器的优势，数学模型和分析以及样品实验结果，以及对未来方向的洞察力。

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