...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of aerospace engineering >Damage Detection in Composite Plates by Using an Enhanced Time Reversal Method
【24h】

Damage Detection in Composite Plates by Using an Enhanced Time Reversal Method

机译：增强时间反转法检测复合材料板的损伤

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

A damage detection technique, which does not rely on any past baseline signals, is proposed to assess damage in composite plates by using an enhanced time reversal method. A time reversal concept of modern acoustics has been adapted to guided-wave propagation to improve the detectability of local defects in composite structures. In particular, wavelet-based signal processing techniques have been developed to enhance the time reversibility of Lamb waves in thin composite laminates. In the enhanced time reversal method, an input signal at an excitation point can be reconstructed if a response signal measured at another point is reemitted to the original excitation point after being reversed in a time domain. This time reversibility is based on linear reciprocity of elastic waves, and it is violated when nonlinearity is caused by a defect along a direct wave path. Examining the deviation of the reconstructed signal from the known initial input signal allows instantaneous identification of damage without requiring the baseline signal for comparison. The validity of the proposed method has been exemplified through experimental studies on a quasi-isotropic laminate with delamination.
机译：提出了一种不依赖于过去的基线信号的损伤检测技术，通过使用增强的时间反转方法来评估复合板的损伤。现代声学的时间反转概念已经适应于导波传播，以提高复合结构中局部缺陷的可检测性。特别地，已经开发了基于小波的信号处理技术来增强薄复合层压板中兰姆波的时间可逆性。在增强型时间反转方法中，如果在另一个点处测量的响应信号在时域中反转后重新释放到原始激励点，则可以重建激励点处的输入信号。这种时间可逆性基于弹性波的线性互易性，当非线性是由沿直接波路径的缺陷引起的时，就会被破坏。检查重构信号与已知初始输入信号的偏差，可以立即识别损坏，而无需基线信号进行比较。通过对具有分层的准各向同性层压板的实验研究，证明了该方法的有效性。

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