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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Experimental Investigation on the Detection of Multiple Surface Cracks Using Vibrothermography with a Low-Power Piezoceramic Actuator
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Experimental Investigation on the Detection of Multiple Surface Cracks Using Vibrothermography with a Low-Power Piezoceramic Actuator

机译：低功率压电陶瓷作动器的振动热成像检测多表面裂纹的实验研究

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摘要

Vibrothermography often employs a high-power actuator to generate heat on a specimen to reveal damage, however, the high-power actuator brings inconvenience to the application and possibly introduces additional damage to the inspected objects. This study uses a low-power piezoceramic transducer as the actuator of vibrothermography and explores its ability to detect multiple surface cracks in a metal part. Experiments were conducted on a thin aluminum beam with three cracks in different orientations. Detailed analyses of both thermograms and temperature data are presented to validate the proposed vibrothermography method. To further investigate the performance of the proposed vibrothermography method, we experimentally studied the effects of several critical factors, including the amplitude of excitation signal, specimen constraints, relative position between the transducer and cracks (the transducer is mounted on the same or the opposite side with the cracks). The results demonstrate that all cracks can be detected conveniently and simultaneously by using the proposed low-power vibrothermography. We also found that the magnitude of excitation signal and the specimen constraints have a great influence on detection results. Combined with effective data processing methods, such as Fourier transformation employed in this study, the proposed method provides a promising potential to detect multiple cracks on a metal surface in a safe and effective manner.
机译：振动热像仪通常使用大功率致动器在样品上产生热量以显示损伤，但是，大功率致动器给应用带来不便，并可能对被检查物体造成额外的损害。这项研究使用低功率压电陶瓷换能器作为振动热成像的执行器，并探索了其检测金属零件中多个表面裂纹的能力。实验是在带有三个不同方向裂缝的薄铝梁上进行的。提出了对温度记录图和温度数据的详细分析，以验证所提出的振动热成像方法。为了进一步研究建议的振动热成像方法的性能，我们通过实验研究了几个关键因素的影响，包括激励信号的幅度，样本约束，换能器与裂纹之间的相对位置（换能器安装在同一侧或相反侧）与裂缝）。结果表明，使用建议的低功率振动热成像技术可以方便且同时检测所有裂缝。我们还发现，激励信号的大小和样本约束对检测结果有很大的影响。结合本研究中使用的有效数据处理方法（例如傅立叶变换），该方法为以安全有效的方式检测金属表面上的多个裂纹提供了广阔的前景。

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