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首页> 外文期刊>Sensors Journal, IEEE >Inspection of Cylindrical Structures Using the First Longitudinal Guided Wave Mode in Isolation for Higher Flaw Sensitivity
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Inspection of Cylindrical Structures Using the First Longitudinal Guided Wave Mode in Isolation for Higher Flaw Sensitivity

机译:使用第一纵向导波模式隔离圆柱结构的检查,以提高缺陷敏感性

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摘要

Less attention has been given to the inspection using the first longitudinal guided wave mode due to its attenuative and dispersive properties at commonly used ultrasonic guided waves (UGWs) operating frequency region (20–100 kHz). However, the first longitudinal guided wave mode has higher flaw sensitivity due to having a shorter wave length and having higher number of non-axisymmetric wave modes at a given frequency. This enhances the capabilities of advanced UGW techniques which require higher number of non-axisymmetric modes. This study has been performed to investigate the potential of mode purity and flaw sensitivity of the first longitudinal guided wave mode compared with other axisymmetric modes in the UGW operating frequency region. Numerical and experimental investigation have been conducted to investigate pure excitation and flaw sensitivity of the first longitudinal guided wave mode. It has been validated that the first longitudinal guided wave mode can be used in the UGW inspection effectively in isolation by adopting transducers with out-of-plane vibration. This reduces the cost and the weight of the UGW inspection tooling. The flaw sensitivity of the first longitudinal guided wave mode has been investigated by aid of an empirically validated UGW focusing technique. Under the studied conditions in this paper, the first longitudinal guided wave mode has times higher flaw sensitivity compared with the second longitudinal guided wave mode and times higher than the first torsional guided wave mode. This enhances the capability of UGW flaw detection and sizing.
机译:由于使用了第一纵向导波模式,因此在常规超声导波(UGW)工作频率范围(20–100 kHz)处具有衰减和色散特性,因此对这种检查的关注较少。然而,由于在给定频率下具有较短的波长和较高数量的非轴对称波模式,因此第一纵向导波模式具有较高的裂纹敏感性。这增强了需要更多数量的非轴对称模式的高级UGW技术的功能。进行了这项研究,以研究在UGW工作频率范围内与其他轴对称模式相比,第一纵向导波模式的模式纯度和缺陷敏感性的潜力。已经进行了数值和实验研究以研究第一纵向导波模式的纯激励和缺陷敏感性。已经证实,通过采用平面外振动的换能器,第一纵向导波模式可以有效地用于UGW检查中,孤立地进行。这减少了UGW检查工具的成本和重量。借助于经验验证的UGW聚焦技术,已经研究了第一纵向导波模式的缺陷敏感性。在本文研究的条件下,第一纵向导波模式与第二纵向导波模式相比具有更高的缺陷敏感性,并且比第一扭转导波模式具有更高的缺陷敏感性。这增强了UGW缺陷检测和大小确定的能力。

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