• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Wideband dispersion reversal of lamb waves
【24h】

Wideband dispersion reversal of lamb waves

机译：兰姆波的宽带色散反转

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

Ultrasonic guided waves have been widely acknowledged as the most promising tools for nondestructive evaluation (NDE). However, because of the multimodal dispersion, the received guided modes usually overlap in both time and frequency, which highly complicates the mode separation and signal interpretation. The time-reversal technique can be used to realize the time recompression of the Lamb waves, but because of the multimode excitation and reception, it still may not be able to remove the mode ambiguity and achieve the pure pulse compression. With the goal of overcoming this limitation, a wideband dispersion reversal (WDR) technique is proposed. The technique makes use of a priori knowledge of the guided dispersion characteristics to synthesize the corresponding dispersion reversal excitations, which are able to selectively excite the self-compensation pure mode pulse. The theoretical basis of the technique is thoroughly described. A two-dimensional finite-difference time-domain (2D-FDTD) method is employed to simulate the propagation of two fundamental Lamb modes, the symmetrical S0 and antisymmetrical A0 modes in a steel plate. The proposed method was verified through experimental investigation. Finally, the advantages and potential applications of the method are briefly discussed.
机译：超声波已被公认为是无损评估（NDE）最有前途的工具。然而，由于多峰色散，所接收的引导模式通常在时间和频率上都重叠，这使得模式分离和信号解释高度复杂。可以使用时间反转技术来实现兰姆波的时间再压缩，但是由于多模激发和接收，它仍然可能无法消除模态歧义并无法实现纯脉冲压缩。为了克服该限制，提出了宽带色散反转（WDR）技术。该技术利用了引导色散特性的先验知识来合成相应的色散反转激励，该激励能够有选择地激发自补偿纯模式脉冲。彻底描述了该技术的理论基础。二维时域有限差分法（2D-FDTD）用于模拟两种基本Lamb模式的传播，即对称S0模式和反对称A0模式在钢板中的传播。通过实验研究验证了该方法的有效性。最后，简要讨论了该方法的优点和潜在应用。

著录项

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