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首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >A PERTURBATION METHOD TO MODEL INTERDIGITAL TRANSDUCERS FOR USE IN SMART STRUCTURES
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A PERTURBATION METHOD TO MODEL INTERDIGITAL TRANSDUCERS FOR USE IN SMART STRUCTURES

机译：用于智能结构的数字传感器建模的摄动方法。

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摘要

This work was motivated by the need for a reasonably accurate and reliable model of interdigital transducers. Results have been found for the mechanical part of the study and have been compared to experimental results or to exact dispersion curves which in turn have been validated many times by previous workers. Concerning the scattering calculations we still have to compare the amplitude formulae obtained for the Lamb waves with finite element models. There is a big threshold to cross between the description of the piezoelectric problem and the solution. An analytical solution has been found for the case where the charges are applied uniformly over the surface. More exact solutions of the amplitude differential equations will require us to find the electrostatic solution for the charge density on the electrodes of the actual transducer. The method that was developed to study the interdigital transducer can be used to evaluate a wide variety of geometries. It is seen how the geometry of the actual IDT is taken into account in the calculation and how the model can be extended to many other geometries and even to many other purposes, and particularly to defect detection and characterization which remains the final aim of a Structural Health Monitoring System based on a smart structure approach.
机译：这项工作的动机是需要一个合理准确和可靠的叉指式换能器模型。已发现研究机械部分的结果，并将其与实验结果或精确的色散曲线进行了比较，而色散曲线又得到先前工作人员的多次验证。关于散射计算，我们仍然必须将兰姆波的振幅公式与有限元模型进行比较。在压电问题的描述和解决方案之间有一个很大的界限。对于将电荷均匀地施加在表面上的情况，已经找到了一种解析解决方案。振幅微分方程的更精确解需要我们为实际换能器的电极上的电荷密度找到静电解。为研究叉指式换能器而开发的方法可用于评估各种几何形状。可以看出，在计算中如何考虑实际IDT的几何形状，以及如何将模型扩展到许多其他几何形状，甚至扩展到许多其他用途，尤其是缺陷检测和表征，这仍然是结构件的最终目标。基于智能结构方法的健康监控系统。

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