Smart Structures and Systems

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Acoustic emission localization in concrete using a wireless air-coupled monitoring system

  • Yunshan Bai (Chongqing Key Laboratory of Geomechanics & Geoenvironmental Protection, Department of Military Installations, Army Logistics Academy of PLA) ;
  • Yuanxue Liu (Chongqing Key Laboratory of Geomechanics & Geoenvironmental Protection, Department of Military Installations, Army Logistics Academy of PLA) ;
  • Guangjian Gao (Department Basic Department, Army Logistics Academy of PLA) ;
  • Shuang Su (Department Basic Department, Army Logistics Academy of PLA)
  • Received : 2022.03.10
  • Accepted : 2023.03.16
  • Published : 2023.10.25
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Abstract

The contact acoustic emission (AE) monitoring system is time-consuming and costly for monitoring concrete structures in large scope, in addition, the great difference in acoustic impedance between air and concrete makes the detection process inconvenient. In this work, we broaden the conventional AE source localization method for concrete to the non-contact (air-coupled) micro-electromechanical system (MEMS) microphones array, which collects the energy-rich leaky Rayleigh waves, instead of the relatively weak P-wave. Finite element method was used for the numerical simulations, it is shown that the propagation velocity of leaky Rayleigh waves traveling along the air-concrete interface agrees with the corresponding theoretical properties of Lamb wave modes in an infinite concrete slab. This structures the basis for implementing a non-contact AE source location approach. Based on the experience gained from numerical studies, experimental studies on the proposed air-coupled AE source location in concrete slabs are carried out. Finally, it is shown that the locating map of AE source can be determined using the proposed system, and the accuracy is sufficient for most field monitoring applications on large plate-like concrete structures, such as tunnel lining and bridge deck.

Keywords

Acknowledgement

This work was supported by the National Natural Science Foundation of China (No. 41877219 and 12274463); Chongqing Research Program of Basic Research and Frontier Technology (No. cstc2015jcyjBX0073); Natural Science Foundation of Chongqing (No. cstc2019jcyj msxmX0585); Chongqing Graduate Student Research Innovation Project (No. CYB21248); and the Scientific and Technological Research Program of Chongqing Municipal Education Commission (KJQN202012901).

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