导波在具有任意变化的厚度的板状结构中的分散特征和模式转换
Xudong Yu1, Hao Zhou2, Zijian Zhang2
1School of Astronautics, Beihang University, Beijing, 102206, China; State Key Laboratory of High-Efficiency Reusable Aerospace Transportation Technology, Beijing, 102206, China; Beijing Key Laboratory of System Design for Reusable Launch Vehicle, Beijing, 102206, China.
这项研究揭示了在不同厚度板上的引导波散射和模式转换如何取决于局部频率-厚度产物. 渐进的厚度变化使能量转移平稳,这对于精确的导波断层扫描至关重要.
科学领域:
- 固体力学 固体力学是什么
- 波浪物理 波浪物理
- 非破坏性测试是指非破坏性测试.
背景情况:
- 导波断层扫描的准确性受到分散和模式转换在不同厚度的板上所限制.
- 缺乏一个统一的框架,将分散,模态转换和对任意厚度变化的亚亚波波理论联系起来.
研究的目的:
- 系统地分析厚度依赖的分散和模式转换在具有不同厚度配置的板块中.
- 为了解复杂几何体中的波传播建立理论基础.
- 为了提高引导波断层扫描的准确性.
主要方法:
- 有限元素 (FE) 模拟
- 半分析有限元 (SAFE) 计算方法
- 实验验证实验验验证的验证
- 权重时间距离映射技术.
主要成果:
- 局部频率-厚度乘积 (fd) 支配分散;高阶模式出现在切线上方.
- 对称的厚度变化导致家族内模式转换;非对称的变化导致家族内模式转换.
- 厚度梯度影响能量分布:渐进的变化促进了平稳的转移,突然的变化将能量集中到更高阶的模式中.
结论:
- 该研究提供了对不同厚度的板块中引导波行为的全面分析.
- 这些发现验证了分散补偿的加权时间距离映射技术.
- 这项研究为涉及复杂结构的工程应用推进了引导波断层扫描.
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