• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>2002 ASME International Mechanical Engineering Congress and Exposition , Nov 17-22, 2002, New Orleans, Louisiana >EMBEDDED-ULTRASONICS STRUCTURAL RADAR FOR NONDESTRUCTIVE EVALUATION OF THIN-WALL STRUCTURES
【24h】

EMBEDDED-ULTRASONICS STRUCTURAL RADAR FOR NONDESTRUCTIVE EVALUATION OF THIN-WALL STRUCTURES

机译：嵌入式超声结构雷达对薄壁结构的非破坏性评估

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

Embedded-Ultrasonics Structural Radar (EUSR) is a new concept and methodology for in-situ nondestructive evaluation (NDE) of thin-wall structures. EUSR utilizes (a) a Piezo Wafer Active Sensors (PWAS) array embedded onto the structure; and (b) electronic modules for signal transmission/reception, processing, and interpretation. The EUSR methodology is developed as an extension of our previous work on the Lamb wave propagation NDE. Based on the study of the Lamb wave characteristic, the excitation signal is optimized to obtain good signal to noise ratio. Lamb wave speed-frequency curve is plotted to obtain the wave speed of the excitation signal. This wave speed is then used to map the EUSR data from time domain to distance domain, thus the locations of the reflectors can be visually displayed. The EUSR algorithm is adopted from the beamforming process currently used in phased-array radar applications. Each element in the PWAS array plays the role of both transmitter and receiver. A circuit is designed to change the role of the PWAS in a round robin fashion. The responses of the structure to all the excitation signals are collected. By applying the EUSR algorithm, an appropriate delay is applied to each signal in the data set to make them all focus on a direction denoted by angle φ. When this angle φ is changed from 0 to 180 degrees, a virtual scanning beam is formed and a large area of the structure can be interrogated. The EUSR algorithm is explained in this paper. Experimental results from a proof-of-concept EUSR system are also presented.
机译：嵌入式超声结构雷达（EUSR）是用于薄壁结构的现场无损评估（NDE）的新概念和新方法。 EUSR使用（a）嵌入到结构中的压电晶片有源传感器（PWAS）阵列； （b）用于信号发送/接收，处理和解释的电子模块。 EUSR方法的开发是对我们之前关于Lamb波传播NDE的工作的扩展。基于对兰姆波特性的研究，优化了激励信号以获得良好的信噪比。绘制兰姆波速度-频率曲线以获得激励信号的波速。然后使用该波速将EUSR数据从时域映射到距离域，从而可以直观地显示反射器的位置。从当前在相控阵雷达应用中使用的波束成形过程中采用EUSR算法。 PWAS阵列中的每个元素都充当发送器和接收器的角色。设计电路以循环方式改变PWAS的作用。收集结构对所有激励信号的响应。通过应用EUSR算法，将适当的延迟应用于数据集中的每个信号，以使它们全部集中在角度φ表示的方向上。当该角度φ从0度改变为180度时，形成虚拟扫描束，并且可以询问结构的大面积。本文介绍了EUSR算法。还提供了概念验证EUSR系统的实验结果。

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