基于有限元的衍射校正用于压电变传器,考虑在传输,传播和接收时的衍射
Eivind Nag Mosland1, Per Lunde1, Jan Kocbach2
1Department of Physics and Technology, University of Bergen, P.O. Box 7803, N-5020 Bergen, Norway.
The Journal of the Acoustical Society of America
|October 9, 2023
概括
本研究提出了超声波系统的新衍射校正模型,避免了简化假设. 先进的有限元模型通过考虑完整的边界条件,提供了更高的测量精度.
科学领域:
- 声学 声学 在声学方面
- 超声波测量系统 超声波测量系统
- 有限元分析 有限元分析
背景情况:
- 现有的超声波衍射校正模型使用边界条件的简化假设.
- 这些简化,就像混乱的活塞模型一样,可能会在某些应用中限制准确性.
- 评估和量化这些假设的有效性对于精确的测量至关重要.
研究的目的:
- 为超声波发射接收系统开发更准确的衍射校正模型.
- 消除关于发射器和接收器边界条件的简化假设.
- 为各种超声波测量场景提供适用于各种超声波测量场景的强大模型.
主要方法:
- 开发了一个有限元模型 (FEM),用于在流体中同轴对齐的压电传感器.
- 在发射器和接收器内嵌有完整的电气和机械边界条件.
- 使用案例研究,将新模型与现有的简化模型进行比较.
主要成果:
- 新模型避免了常见的简化,提高了准确性.
- 在现有模型中,由于简化,特别是近场,观察到严重的错误 (高达3dB和47°).
- 错误取决于距离,频率,传感器设计和介质特性等因素.
结论:
- 拟议的有限元模型为超声波系统提供了更准确的衍射校正.
- 简化模型可能引入大量错误,需要使用更全面的方法.
- 模型的准确性通过与现有方法进行比较和对错误依赖性的分析来验证.
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