Smart Structures and Systems

  • 제24권2호
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  • Pages.173-182
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  • 2019
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  • 1738-1584(pISSN)
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  • 1738-1991(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Impact location on a stiffened composite panel using improved linear array

  • Zhong, Yongteng (College of Mechanical and Electrical Engineering, Wenzhou University) ;
  • Xiang, Jiawei (College of Mechanical and Electrical Engineering, Wenzhou University)
  • 투고 : 2018.10.23
  • 심사 : 2019.04.26
  • 발행 : 2019.08.25
⟨ 이전 논문 다음 논문 ⟩

초록

Due to the degradation of beamforming properties at angles close to $0^{\circ}$ to $180^{\circ}$, linear array does not have a complete $180^{\circ}$ inspection range but a smaller one. This paper develops a improved sensor array with two additional sensors above and below the linear sensor array, and presents time difference and two dimensional multiple signal classification (2D-MUSIC) based impact localization for omni-directional localization on composite structures. Firstly, the arrival times of impact signal observed by two additional sensors are determined using the wavelet transform and compared, and the direction range of impact source can be decided in general, $0^{\circ}$ to $180^{\circ}$ or $180^{\circ}$ to $360^{\circ}$. And then, 2D-MUSIC based spatial spectrum formula using uniform linear array is applied for locate accurate position of impact source. When the arrival time of impact signal observed by two additional sensors is equal, the direction of impact source can be located at $0^{\circ}$ or $180^{\circ}$ by comparing the first and last sensor of linear array. And then the distance is estimated by time difference algorithm. To verify the proposed approach, it is applied to a quasi-isotropic epoxy laminate plate and a stiffened composite panel. The results are in good agreement with the actual impact occurring position.

키워드

과제정보

연구 과제 주관 기관 : National Science Foundation of China

참고문헌

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