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Development of Multilayer Transducer and Omnidirectional Reflection Model for Active Reflection Control.

Beom Hoon Park1, Han Bin Choi1, Hee-Seon Seo2

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Summary

This study introduces a smart skin for unmanned underwater vehicles (UUVs) to evade sonar detection. The innovative skin actively controls reflected sound waves, significantly enhancing underwater stealth capabilities.

Keywords:
SONARactive reflection controlcymbal transducerpiezo materialstacked piezoelectric transducerunmanned underwater vehicle (UUV)

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Area of Science:

  • Marine Engineering
  • Acoustics
  • Materials Science

Background:

  • Underwater detection relies heavily on sonar technology.
  • Stealth is critical for modern underwater warfare and unmanned underwater vehicles (UUVs).

Purpose of the Study:

  • To develop a smart skin for UUVs that actively controls reflected signals to avoid sonar detection.
  • To enhance the stealth capabilities of UUVs in underwater environments.

Main Methods:

  • A multilayer transducer smart skin comprising an acoustic window, receiver, and transmitter was designed.
  • Finite element analysis was used to characterize sensor performance, selecting Polyvinylidene fluoride (PVDF) for reception and a stacked piezoelectric transducer for transmission.
  • An active reflection control system was modeled and validated through 2D 360° reflection experiments.

Main Results:

  • The smart skin effectively separates incident and reflected signals using time-delay separation.
  • Phase-shifted transmitted sound was utilized to cancel reflected waves, demonstrating a stealth effect.
  • The performance of different sensor designs was compared, with PVDF and stacked piezoelectric transducers chosen for their optimal characteristics.

Conclusions:

  • The proposed smart skin offers a viable method for UUVs to achieve stealth by actively managing sonar reflections.
  • This technology has significant implications for enhancing the survivability and operational effectiveness of UUVs in military applications.