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Modal response coupling mechanism in multi-element coupled transducers.

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This study broadens the bandwidth of multi-element coupled transducers (MCTs) by optimizing element excitation. This advancement enhances low-frequency underwater acoustic transducer performance for practical applications.

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Area of Science:

  • Acoustics
  • Materials Science
  • Mechanical Engineering

Background:

  • Multi-element coupled transducers (MCTs) reduce operating frequency via acoustic interactions.
  • Narrow bandwidth of MCTs limits their practical underwater acoustic applications.

Purpose of the Study:

  • Investigate a novel MCT design with three axially aligned bender transducers.
  • Broaden the operational bandwidth of MCTs through optimized excitation.
  • Provide theoretical and practical guidance for designing low-frequency broadband underwater acoustic transducers.

Main Methods:

  • Developed a theoretical underwater acoustic radiation model for far-field pressure analysis.
  • Employed modal superposition theory to examine multi-mode coupling mechanisms.
  • Optimized element excitation amplitudes and phases to achieve positive modal coupling.

Main Results:

  • Fabricated and evaluated a prototype MCT.
  • Achieved a maximum transmitting voltage response (TVR) of 131.2 dB between 460-1002 Hz.
  • Reduced in-band fluctuation by approximately 12.3 dB compared to conventional methods.

Conclusions:

  • Optimized modal coupling significantly broadens MCT operational bandwidth.
  • The developed MCT design offers improved performance for low-frequency broadband applications.
  • This research provides valuable insights for future underwater acoustic transducer development.