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Finite Element Modeling of Piezoelectric Ultrasonic Transducers

机译:压电超声换能器的有限元建模

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摘要

The optimization of piezoelectric ultrasonic transducers has tradisionally been done through trial and error, somewhat guided by one-dimentional simulations. This can often be a very time-consuming and expensive process, hence a more extensive simulation method is desired.A series of finite element models of piezoelectric ultrasonic transducer has been made in COMSOL Multiphysics. The initial models were designed to emulate the conditions assumed in a one-dimentional transducer model, and their validity could thus be confirmed by said model. Later models did not emulate these conditions, and a lossless model of a spherical disc with backing and a single matching layer was successfully implemented. Attemps had been made to include mechanical loss in the initial models, but was only partially achieved. All loss was thus excluded from later models. A final model with a piezoelectric layer poled in the radial direction was not successfully designed, as the varying poling direction proved to be difficult to implement.
机译:压电超声换能器的优化通常是通过反复试验来完成的,在某种程度上受一维模拟的指导。这通常是一个非常耗时且昂贵的过程,因此需要一种更广泛的仿真方法。在COMSOL Multiphysics中,已建立了一系列压电超声换能器的有限元模型。初始模型被设计为模拟一维换能器模型中假设的条件,因此可以通过所述模型确认其有效性。后来的模型没有模拟这些条件,并且成功实现了具有背衬和单个匹配层的球形圆盘的无损模型。尝试将机械损失包括在初始模型中,但仅部分实现。因此,所有损失都从以后的模型中排除。由于事实证明难以实现变化的极化方向,因此未成功设计出具有沿径向极化的压电层的最终模型。

著录项

  • 作者

    Nygren Morten Wollert;

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  • 年度 2011
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  • 原文格式 PDF
  • 正文语种 eng
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