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Sensors 2013, 13(10), 13356-13381; doi:10.3390/s131013356

Digital Sequences and a Time Reversal-Based Impact Region Imaging and Localization Method

The State Key Lab of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, 29# Yu Dao Street, Nanjing 210016, China
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Received: 21 August 2013 / Revised: 24 September 2013 / Accepted: 24 September 2013 / Published: 1 October 2013
(This article belongs to the Section Physical Sensors)
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Abstract

To reduce time and cost of damage inspection, on-line impact monitoring of aircraft composite structures is needed. A digital monitor based on an array of piezoelectric transducers (PZTs) is developed to record the impact region of impacts on-line. It is small in size, lightweight and has low power consumption, but there are two problems with the impact alarm region localization method of the digital monitor at the current stage. The first one is that the accuracy rate of the impact alarm region localization is low, especially on complex composite structures. The second problem is that the area of impact alarm region is large when a large scale structure is monitored and the number of PZTs is limited which increases the time and cost of damage inspections. To solve the two problems, an impact alarm region imaging and localization method based on digital sequences and time reversal is proposed. In this method, the frequency band of impact response signals is estimated based on the digital sequences first. Then, characteristic signals of impact response signals are constructed by sinusoidal modulation signals. Finally, the phase synthesis time reversal impact imaging method is adopted to obtain the impact region image. Depending on the image, an error ellipse is generated to give out the final impact alarm region. A validation experiment is implemented on a complex composite wing box of a real aircraft. The validation results show that the accuracy rate of impact alarm region localization is approximately 100%. The area of impact alarm region can be reduced and the number of PZTs needed to cover the same impact monitoring region is reduced by more than a half. View Full-Text
Keywords: composite structures; impact monitoring; time reversal; digital sequence composite structures; impact monitoring; time reversal; digital sequence
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Qiu, L.; Yuan, S.; Mei, H.; Qian, W. Digital Sequences and a Time Reversal-Based Impact Region Imaging and Localization Method. Sensors 2013, 13, 13356-13381.

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