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Evaluation method for acoustic underwater propulsion systems.

Deqing Kong1, Yuan Qian2, Minoru Kuribayashi Kurosawa2

  • 1Muroran Institute of Technology, Muroran, Japan.

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This study evaluates an acoustic underwater propulsion system using an ultrasonic transducer. The prototype swimmer achieved a no-load speed of 6.1 mm/s and zero-speed propulsion force of 0.2 mN, showing potential for underwater applications.

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Area of Science:

  • Acoustics
  • Robotics
  • Materials Science

Background:

  • Acoustic underwater propulsion systems utilize bulk and surface acoustic waves.
  • Ultrasonic transducers offer a promising avenue for developing compact and efficient propulsion systems.

Purpose of the Study:

  • To evaluate an acoustic propulsion system based on a 2.065-MHz lead-zirconate-titanate ultrasonic transducer.
  • To design and fabricate a prototype swimmer utilizing this system.
  • To propose an evaluation method for optimizing acoustic underwater propulsion swimmers.

Main Methods:

  • Investigated the admittance difference of the transducer in water and air.
  • Measured the vibration amplitude of the transducer to assess performance.
  • Calculated acoustic radiation force and measured zero-speed propulsion (ZSP) force and no-load speed (NLS).

Main Results:

  • The prototype swimmer achieved a NLS of 6.1 mm/s and ZSP force of 0.2 mN at 12.4 Vpp and 0.4 W.
  • The acoustic propulsion system demonstrated an average efficiency of 69% in water.
  • Overall swimmer movement efficiency was less than 1% due to fluid resistance and wire traction.

Conclusions:

  • The proposed evaluation method, based on admittance, force, speed, and efficiency, aids in optimizing acoustic propulsion swimmers.
  • The small size, high power density, and simple structure make ultrasonic transducer-based acoustic propulsion suitable for pipeline inspection and repair.