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Digital sequences and a time reversal-based impact region imaging and localization method.

Lei Qiu1, Shenfang Yuan, Hanfei Mei

  • 1The State Key Lab of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, 29# Yu Dao Street, Nanjing 210016, China. ql19830925@nuaa.edu.cn.

Sensors (Basel, Switzerland)
|October 3, 2013
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Summary

This study introduces a new method for on-line impact monitoring in aircraft composite structures using digital sequences and time reversal. The technique significantly improves the accuracy and reduces the area of impact alarm regions, lowering inspection costs.

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Area of Science:

  • Aerospace Engineering
  • Materials Science
  • Structural Health Monitoring

Background:

  • On-line impact monitoring of aircraft composite structures is crucial for reducing inspection time and cost.
  • Current digital monitors using piezoelectric transducers (PZTs) face challenges with low localization accuracy, especially in complex structures.
  • Limited PZTs for large structures result in large impact alarm regions, increasing inspection overhead.

Purpose of the Study:

  • To develop an improved impact alarm region imaging and localization method for aircraft composite structures.
  • To address the limitations of low accuracy and large alarm regions in existing digital impact monitoring systems.
  • To enhance the efficiency and cost-effectiveness of damage inspections in aerospace applications.

Main Methods:

  • A novel method combining digital sequences and time reversal for impact alarm region imaging and localization.
  • Estimation of impact response signal frequency bands using digital sequences.
  • Construction of characteristic signals via sinusoidal modulation and application of phase synthesis time reversal for impact imaging.
  • Generation of an error ellipse for final impact alarm region determination.

Main Results:

  • The proposed method achieves approximately 100% accuracy in impact alarm region localization.
  • Demonstrated reduction in the area of the impact alarm region.
  • Significant decrease (by more than half) in the number of PZTs required for monitoring the same area.
  • Validation conducted on a complex composite wing box of a real aircraft.

Conclusions:

  • The digital sequences and time reversal-based method effectively enhances impact alarm region localization accuracy and reduces its size.
  • This approach offers a more efficient and cost-effective solution for on-line impact monitoring of aircraft composite structures.
  • The method shows significant potential for improving structural health monitoring in aerospace applications.