• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Modeling Lamb wave propagation induced by adhesively bonded PZTs on thin plates.
【24h】

Modeling Lamb wave propagation induced by adhesively bonded PZTs on thin plates.

机译：模拟由薄板上的粘合PZT引起的Lamb波传播。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Use of surface-mounted piezoelectric actuators to generate acoustic ultrasounds has been demonstrated to be a key component of built-in nondestructive detection evaluation (NDE) techniques, which can automatically inspect and interrogate damage in hard-to-access areas in real time without disassembly of the structural parts. However, piezoelectric actuators create complex waves which propagate through the structure. Having the capability to model piezoelectric actuator-induced wave propagation and understanding its physics are essential to developing advanced algorithms for the built-in NDE techniques.;Therefore, the objective of this investigation was to develop an efficient hybrid spectral element with two main goals: (1) to model piezoelectric actuator-induced high frequency wave propagation in thin plates, and (2) to fundamentally understand the role of the adhesive interface between the piezoelectric transducers and the host plates under acousto-ultrasonic ranges. The hybrid element adopts the advantages of both a high-order spectral element in-plane direction and a linear finite element in a thickness direction to efficiently analyze Lamb wave propagation in thin plates. The hybrid spectral element out-performs other elements in terms of having significantly faster computation and smaller memory requirements.;Using the hybrid spectral element, the effects of the adhesive bondline layer on the Lamb wave generation and reception were modeled and compared with available test data. The trends in simulation results agreed well with the experiments. Depending upon the stiffness and thickness of the adhesive layer, the stress waves induced by the piezoelectric actuators may vary significantly. Parametric studies are presented to understand the adhesive layer effects. In these studies, adhesive thickness and stiffness, and piezo diameter and thickness are selected as parameters. The physics of the adhesive layer are then discussed.;The hybrid spectral element is proven to be an efficient technique to model PZT-induced wave propagation in thin plates and the complicated thin adhesive layer effects. The element enables fundamental understanding of PZT-induced wave propagation and the adhesive layer effects.
机译：已经证明，使用表面安装压电致动器来产生声超声波是内置无损检测评估（NDE）技术的关键组成部分，该技术可以实时自动检查和询问难以接近的区域中的损坏，而无需拆卸的结构零件。但是，压电致动器会产生复杂的波，这些波会通过结构传播。具有建模压电致动器引起的波传播并了解其物理性质的能力对于开发内置NDE技术的高级算法至关重要。因此，本研究的目的是开发一种有效的混合频谱元素，其主要目的有两个： （1）对压电致动器引起的高频波在薄板中的传播进行建模，以及（2）从根本上理解声-超声范围内压电换能器与主体板之间的粘合界面的作用。混合元素同时具有面内方向的高阶谱元素和厚度方向上的线性有限元素的优势，可以有效地分析兰姆波在薄板中的传播。混合光谱元素在计算速度更快和内存需求方面要优于其他元素。；使用混合光谱元素，对粘合线层对兰姆波产生和接收的影响进行了建模，并与可用的测试数据进行了比较。 。仿真结果的趋势与实验吻合得很好。取决于粘合剂层的硬度和厚度，由压电致动器引起的应力波可以显着变化。提出参数研究以了解粘合剂层的影响。在这些研究中，选择粘合剂厚度和刚度以及压电直径和厚度作为参数。然后讨论了粘合剂层的物理性质。混合光谱元素被证明是一种有效的技术，可以模拟PZT引起的薄板中波的传播以及复杂的薄粘合剂层效应。该元素使您能够基本了解PZT引起的波传播和粘合层效应。

著录项

  • 作者

    Ha, Sungwon.;

  • 作者单位

    Stanford University.;

  • 授予单位 Stanford University.;
  • 学科 Engineering Aerospace.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 89 p.
  • 总页数 89
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 航空、航天技术的研究与探索;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号