...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Structural health monitoring >IWSHM 2017: Damage-scattered wave extraction in an integral stiffened isotropic plate: a baseline-subtraction-free approach
【24h】

IWSHM 2017: Damage-scattered wave extraction in an integral stiffened isotropic plate: a baseline-subtraction-free approach

机译：IWSHM 2017：整体加筋各向同性板中损伤分散波的提取：无基线减法

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 enable long-distance inspection of structures for health monitoring purposes. However, this capability is diminished when applied to complex structures where damage-scattered waves are often buried by scattering from various structural components or boundaries in the time–space domain. Here, a baseline-subtraction-free inspection concept based on the Radon transform is proposed to identify and separate these scattered waves from those scattered by damage. The received time–space domain signals can be converted into the Radon domain, in which the scattered signals from structural components are suppressed into relatively small regions such that damage-scattered signals can be identified and extracted. In this study, a piezoelectric wafer and a linear scan via laser Doppler vibrometer were used to excite and acquire the Lamb wave signals in an aluminum plate with multiple stiffeners. Linear and inverse linear Radon transform algorithms were applied to the direct measurements. Currently, this method needs baseline measurements for comparison in the Radon domain, but avoids baseline subtraction. The results demonstrate the effectiveness of the Radon transform as an extraction tool for damage-scattered waves in a stiffened aluminum plate for a damage site in the bay area between two stiffeners and also suggest the possibility of generalizing this technique for application to a wide variety of complex, large-area structures.
机译：超声波导波可以对结构进行长距离检查，以进行健康监测。但是，当将其应用于复杂结构时，这种能力会减弱，在这些复杂结构中，由于时空域中各种结构组件或边界的散射，常常将损坏散射波掩埋。在此，提出了一种基于Radon变换的无基线减法检查概念，以将这些散射波与由于损伤而散射的那些波分离并分离。接收到的时空域信号可以转换为Radon域，在Radon域中，来自结构组件的散射信号被抑制到相对较小的区域，从而可以识别和提取损伤分散的信号。在这项研究中，使用压电晶片和通过激光多普勒振动计进行的线性扫描来激发并获取具有多个加劲肋的铝板中的兰姆波信号。线性和逆线性Radon变换算法应用于直接测量。当前，此方法需要基线测量以在Radon域中进行比较，但避免了基线减法。结果证明了Radon变换作为一种提取工具的作用，该提取工具用于在两个加劲肋之间的隔间区域中的加劲铝板中，对加劲的铝板中的损弹散射波进行提取，并且还提出了将该技术推广应用到各种各样的方法中的可能性。复杂的大面积结构。

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