Center for Applied Physics and Technology, Peking University, Beijing, China; LTCS and College of Engineering, Peking University, Beijing 100871, China.
LTCS and College of Engineering, Peking University, Beijing 100871, China.
Ultrasonics. 2020 Aug;106:106162. doi: 10.1016/j.ultras.2020.106162. Epub 2020 Apr 18.
In modern industries, long-distance guided wave inspection has been routinely used for various types of pipelines. The usage of T(0,1) wave is always of great interests since it is the only non-dispersive wave mode in pipes. In this work, a pair of pitch-catch piezoelectric ring arrays were proposed for long-distance structural health monitoring (SHM) of buried pipes. Firstly, the working principle of the proposed transducer was introduced. Next, the performances of thickness-shear (d) and face-shear (d) modes based piezoelectric ring transducers in T(0,1) wave generation and reception were comparatively tested. It was found that at most frequencies, it is best to employ the d ring as the exciter and the d ring as the receiver. Then, the signal-to-noise ratio (SNR) of the generated T(0,1) wave and its attenuation in pipes with different coating conditions were investigated to estimate the detectable distance using the proposed transducer. Results showed that after applying acoustical isolation layer on pipes, the proposed ring transducers can inspect buried pipes over 20 m. Finally, the performance of the ring transducers in defect detection was validated. This work is expected to provide a promising solution to long-distance SHM of buried pipes.
在现代工业中，长距离导波检测已被常规应用于各种类型的管道。由于 T(0,1)波是管道中唯一的非频散波模式，因此其应用一直备受关注。在这项工作中，我们提出了一种用于埋地管道远距离结构健康监测 (SHM) 的对顶式压电环阵列。首先，介绍了所提出的换能器的工作原理。然后，比较了基于厚度剪切 (d) 和面剪切 (d) 模式的压电环换能器在 T(0,1)波产生和接收方面的性能。结果发现，在大多数频率下，最好使用 d 环作为激励器，使用 d 环作为接收器。然后，研究了不同涂层条件下管道中产生的 T(0,1)波的信噪比 (SNR) 及其衰减，以估计使用所提出的换能器的可检测距离。结果表明，在管道上施加隔音层后，所提出的环换能器可以检测超过 20 m 的埋地管道。最后，验证了环换能器在缺陷检测中的性能。这项工作有望为埋地管道的远距离 SHM 提供一种有前途的解决方案。
