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首页> 外文会议>2002 ASME International Mechanical Engineering Congress and Exposition , Nov 17-22, 2002, New Orleans, Louisiana >EMBEDDED ULTRASONIC STRUCTURAL RADAR WITH PIEZOELECTRIC WAFER ACTIVE SENSORS FOR THE NDE OF THIN-WALL STRUCTURES
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EMBEDDED ULTRASONIC STRUCTURAL RADAR WITH PIEZOELECTRIC WAFER ACTIVE SENSORS FOR THE NDE OF THIN-WALL STRUCTURES

机译：薄壁结构NDE的带压电晶片有源传感器的嵌入式超声结构雷达

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摘要

Embedded-ultrasonics structural radar (EUSR) is a new concept and methodology for in-situ nondestructive evaluation (NDE) and structural health monitoring (SHM) of thin-wall structures. EUSR consists (a) an array of piezoelectric wafer active sensors (PWAS) embedded into the structure; and (b) electronic modules for signal transmission/reception, processing, and interpretation. EUSR utilizes guided elastic waves (Lamb waves) generated omnidirectionally into the thin-wall structure by surface-mounted permanently-attached PWAS. The paper starts with the general concepts of the EUSR algorithm; transmission beamforming, reception beamforming, and time of fight determination. Next, details of the Lamb wave generation with PWAS, verification of group-velocity dispersion curves, identification of optimal excitation frequency, and confirmation of wave front omnidirectionality are discussed. In the third part of the paper, the actual implementation of the EUSR method in a proof-of-concept demonstration is presented. The construction of the PWAS phased array is described, and detection of cracks located broadside and offside of the PWAS array is illustrated. The method is shown to be easy to use through a visually interactive LabView~(TM) interface. Very good detection accuracy is observed. Though the proof-of-concept experiments presented in this paper were illustrated on metallic structures, the EUSR concept works just as well on composite and hybrid structures.
机译：嵌入式超声结构雷达（EUSR）是用于薄壁结构的原位无损评估（NDE）和结构健康监测（SHM）的新概念和新方法。 EUSR包括（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利用通过表面安装的永久附着式PWAS在薄壁结构中全方位产生的引导弹性波（兰姆波）。本文从EUSR算法的一般概念入手。发送波束成形，接收波束成形和战斗时间确定。接下来，将讨论利用PWAS生成兰姆波的详细信息，群速度色散曲线的验证，最佳激励频率的确定以及波前全向性的确认。在本文的第三部分中，介绍了EUSR方法在概念验证演示中的实际实现。描述了PWAS相控阵的构造，并说明了检测PWAS阵宽边和反边的裂纹的方法。通过视觉上互动的LabView〜（TM）界面显示该方法易于使用。观察到非常好的检测精度。尽管本文介绍的概念验证实验在金属结构上进行了说明，但EUSR概念在复合结构和混合结构上也同样有效。

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