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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Analytical modeling for fast simulations of ultrasonic measurementson fluid-loaded layered elastic structures
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Analytical modeling for fast simulations of ultrasonic measurementson fluid-loaded layered elastic structures

机译：流体加载层状弹性结构中超声测量快速仿真的分析模型

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摘要

Quantitative modeling of ultrasonic pulse-echo and pitch-catchnmeasurements for non-destructive evaluation (NDE) of bulk or layerednfluid-immersed elastic materials is important for optimal measurementndesign, data interpretation, and parameter inversion. Just as importantnis the computational efficiency of the resulting numerical algorithms tonensure that they are exploited effectively. For defect-freenconfigurations consisting of planar and cylindrical homogeneous andnisotropic layers, analytical modeling, employing spectral integralndecomposition and synthesis, offers a powerful tool to meet thisnrequirement. The analytical approach allows the expression of thenreceiving transducer voltage and the beam-structure interaction in termsnof a spectral wavenumber integral. Within this representation,ntransducer beams are specified in terms of their pressure or normalnvelocity spectra or, alternatively and more conveniently, in terms ofnGaussian beams generated through the complex transducer point (CTP)ntechnique. The voltage integrals may be implemented numerically ornreduced to closed-form solutions via high frequency asymptoticntechniques. This article summarizes the theory, discusses its numericalnimplementation, and illustrates its applications through two time-domainnmeasurements. The first pertains to a pulse-echo measurement conductednfrom inside a cylindrically layered structure and for which thentheoretical predictions are successfully validated by experimental data.nThe second pertains to a pitch-catch measurement to generate and detectnleaky Lamb waves in a plate. For this latter case, uniform asymptotics,nvalidated by comparisons with numerical integration, is used to isolatenthe contributions of the various Lamb modes to the total voltage
机译：超声脉冲回波和弯矩捕获量测量的定量建模对于大体积或分层浸没在流体中的弹性材料的无损评估（NDE）对于优化测量设计，数据解释和参数反演至关重要。同样重要的是，所得数值算法的计算效率表明它们已得到有效利用。对于由平面和圆柱状均质和各向异性层组成的无缺陷配置，采用光谱积分分解和合成的分析建模可提供满足此要求的强大工具。分析方法允许以频谱波数积分的形式表示接收到的换能器电压和束结构相互作用。在该表示中，n换能器束是根据其压力或法向速度谱来指定的，或者替代地并且更方便地是根据通过复杂换能器点（CTP）技术生成的n高斯束来指定的。可以通过高频渐近技术将电压积分数字化或简化为闭式解。本文总结了该理论，讨论了其数值实现，并通过两个时域测量说明了其应用。第一个涉及从圆柱形层状结构内部进行的脉冲回波测量，然后通过实验数据成功地验证了理论预测。第二个涉及用于在板中产生和检测出泄漏的兰姆波的音高捕获测量。对于后一种情况，采用统一渐近线，并通过与数值积分的比较进行验证，以隔离各种Lamb模式对总电压的贡献

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