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首页> 外文期刊>Smart Materials & Structures >A variable-frequency structural health monitoring system based on omnidirectional shear horizontal wave piezoelectric transducers
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A variable-frequency structural health monitoring system based on omnidirectional shear horizontal wave piezoelectric transducers

机译：基于全向剪切水平波压电传感器的可变频率结构健康监测系统

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摘要

Structural health monitoring (SHM) is of great importance for engineering structures as it may detect the early degradation and thus avoid life and financial loss. Guided wave based inspection is very useful in SHM due to its capability for long distance and wide range monitoring. The fundamental shear horizontal (SH0) wave based method should be most promising since SH0 is the unique non-dispersive wave mode in plate-like structures. In this work, a sparse array SHM system based on omnidirectional SH wave piezoelectric transducers (OSH-PT) was proposed and the multi data fusion method was used for defect inspection in a 2 mm thick aluminum plate. Firstly, the performances of three types OSH-PTs was comprehensively compared and the thickness-poled d(15) mode OSH-PT used in this work was demonstrated obviously superior to the other two. Then, the signal processing method and imaging algorithm for this SHM system was presented. Finally, experiments were carried out to examine the performance of the proposed SHM system in defect localization and imaging. Results indicated that this SHM system can locate a through hole as small as 0.12 lambda (4 mm) in diameter (where. is the wavelength corresponding to the central operation frequency) under frequencies from 90 to 150 kHz. It can also locate multiple defects accurately based on the baseline subtraction method. Obviously, this SHM system can detect larger areas with sparse sensors because of the adopted single mode, non-dispersive and low frequency SH0 wave which can propagate long distance with small attenuation. Considering its good performances, simple data processing and sparse array, this SH0 wave-based SHM system is expected to greatly promote the applications of guided wave inspection.
机译：结构健康监测（SHM）对工程结构具有重要意义，因为它可能会检测到早期退化，从而避免生命和财务损失。由于其长距离和宽范围监测的能力，引导波基的检查在SHM中非常有用。由于SH0是板状结构中的独特的非分散波模式，因此应该最有希望的基础剪切水平（SH0）基于基于剪切的方法。在这项工作中，提出了一种基于全向SH波压电换能器（OSH-PT）的稀疏阵列SHM系统，并且使用多数据融合方法在2mm厚的铝板中进行缺陷检查。首先，综合地比较了三种类型OSH-PTS的性能，并且在该工作中使用的厚度 - 极化的D（15）模式OSH-PT显然优于其他两个。然后，提出了该SHM系统的信号处理方法和成像算法。最后，进行了实验以检查所提出的SHM系统在缺陷定位和成像中的性能。结果表明，该SHM系统可以将通孔定位为直径为0.12λ（4mm）的频率（在其中的波长。与中央操作频率相对应的波长），在频率为90至150 kHz。它还可以基于基线减法方法准确地定位多种缺陷。显然，由于采用的单模，非分散和低频SH0波，这种SHM系统可以检测具有稀疏传感器的较大区域，这可以与小衰减长距离传播。考虑到其良好的性能，简单的数据处理和稀疏阵列，这是基于SH0基的SHM系统预计大大推动了引导波检测的应用。

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