基于声子晶体的声发射波源检测概率研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (7) : 75-83.

论文

基于声子晶体的声发射波源检测概率研究

李红豫，曾祥兴，张璐

作者信息 +

Determination of POD of AE wave source based on phononic crystals

LI Hongyu, ZENG Xiangxing, ZHANG Lu

Author information +

文章历史 +

摘要

声发射（Acoustic Emission，AE）检测就是利用采集和分析声发射现象所产生的信号从而实现对材料进行无损评价的技术，该技术具有实时监测并定位破坏源的能力但是由于检测过程中声发射源信号未知，因此评价检测可靠性的检测概率（Probability of Detection，POD)研究仍然是空白。进一步来说，在利用声发射监测损伤过程时，声发射波源直接决定其检测结果的可靠性，因此波源的检测概率可以成为量化声发射检测有效性的一个重要指标。本文为了确定声发射波源的检测概率，利用声子晶体（Phononic Crystals，PCs）的特性，通过部署声子晶体形成物理带隙，滤除噪声信号，从而获得铝合金试件在紧凑拉伸试验下由于疲劳裂缝活动而引起的声发射信号，最终确定声发射源的检测概率及其影响因素。结果表明，检测概率会随着疲劳裂缝扩展而提高，但裂缝长度达到一定值后开始下降，最终趋于一个平稳值，另外通过设置阈值和选择适当的滤波器，能有效提高检测概率，保证声发射评价结构损伤的有效性。本研究对声发射源识别和检测可靠性评价具有重要意义。

Abstract

Acoustic emission testing (AE) is a nondestructive method for evaluating material status that involves the acquisition and analysis of signals produced by damage. However, the unknown AE source during testing poses a challenge to the study of probability of detection (POD). Moreover, the reliability of the detection results when utilizing acoustic emission to identify interior material degradation can be directly influenced by the acoustic emission source, making the AE source's detection probability a crucial consideration in acoustic emission detection. In this study, we use the features of phononic crystal to form a physical stopband to filter out the noise signals. Then the acoustic emission signal due to the crack growth of aluminum metal compact tensile specimens under cyclic loading can be obtained. To further explore the influence of threshold level and systematic filter frequency on the POD, the parametric study was conducted. The AE source related POD was estimated experimentally, and the POD increases with the growth of fatigue cracks, herein, the peak POD happens in the process of cracking other than the end stage. In addition, with the proper selection of the threshold and filters, the AE results can be improved more reliable. Therefore, it is essential to assess the POD for the AE method.

导出引用

李红豫，曾祥兴，张璐. 基于声子晶体的声发射波源检测概率研究[J]. 振动与冲击, 2024, 43(7): 75-83

LI Hongyu, ZENG Xiangxing, ZHANG Lu. Determination of POD of AE wave source based on phononic crystals[J]. Journal of Vibration and Shock, 2024, 43(7): 75-83

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