Volume 45 Issue 7
Jul.  2019
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KONG Yue, LI Min, CHEN Weiminet al. Sensor arrangement in moment-tensor inversion for cracks[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(7): 1380-1387. doi: 10.13700/j.bh.1001-5965.2018.0705(in Chinese)
Citation: KONG Yue, LI Min, CHEN Weiminet al. Sensor arrangement in moment-tensor inversion for cracks[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(7): 1380-1387. doi: 10.13700/j.bh.1001-5965.2018.0705(in Chinese)

Sensor arrangement in moment-tensor inversion for cracks

doi: 10.13700/j.bh.1001-5965.2018.0705
Funds:

National Natural Science Foundation of China 11232012

National Natural Science Foundation of China 11372320

More Information
  • Corresponding author: LI Min, E-mail: limin@buaa.edu.cn
  • Received Date: 30 Nov 2018
  • Accepted Date: 04 Jan 2019
  • Publish Date: 20 Jul 2019
  • The moment-tensor inversion method utilizes acoustic-emission signal to obtain cracking information and is regarded as an effective tool to monitor the dynamic growth of cracks. However, in engineering practices, the signal, got by sensors, is always contaminated by noise. The noise will reduce moment-tensor accuracy, and even cause completely wrong results. Sensor arrangements are studied to suppress the effect of noise on moment-tensor accuracy. Based on the first-arrival polarity method, the theory of choosing sensor locations is analyzed. The sensitivity of moment-tensor inversion accuracy to noise is investigated with different sensor arrangements by the use of synthetical acoustic-emission signal. The results show that the pentagonal arrangement of sensors is a superior form, where five sensors locate on a circle, the azimuthal angle between adjacent sensors is 72°, and the sixth sensor locates at the center of the circle. Then the condition number of the equation set achieves a relative small value. When the wave amplitude is changed by noise, the moment-tensor result is quite stable and achieves high accuracy. For the determination of sensor arrangement in moment-tensor inversion, the guidelines and theoretical basis of engineering practices are provided in the study.

     

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