School of Transportation Science and Engineering, Beihang University, Beijing 100191, PR China.
Ultrasonics. 2012 Jul;52(5):587-92. doi: 10.1016/j.ultras.2011.12.003. Epub 2011 Dec 17.
This paper attempts to introduce a near-field acoustic emission (AE) beamforming method to estimate the AE source locations by using a small array of sensors closely placed in a local region. The propagation characteristics of AE signals are investigated based on guided wave theory to discuss the feasibility of using beamforming techniques in AE signal processing. To validate the effectiveness of the AE beamforming method, a series of pencil lead break tests at various regions of a thin steel plate are conducted. The potential of this method for engineering applications are explored through rotor-stator rubbing tests. The experimental results demonstrate that the proposed method can effectively determine the region where rubbing occurs. It is expected that the work of this paper may provide a helpful analysis tool for near-field AE source localization.
本文试图引入一种近场声发射（AE）波束形成方法，通过在局部区域内紧密放置的小传感器阵列来估计 AE 源位置。基于导波理论研究 AE 信号的传播特性，探讨了在 AE 信号处理中使用波束形成技术的可行性。为了验证 AE 波束形成方法的有效性，在薄钢板的不同区域进行了一系列铅笔芯折断测试。通过转子-定子摩擦试验探索了该方法在工程应用中的潜力。实验结果表明，该方法可以有效地确定发生摩擦的区域。期望本文的工作可以为近场 AE 源定位提供一个有用的分析工具。
