A liquid column resonance transducer driven by Class IV flextensional transducer

Area of Science:

• Underwater acoustics
• Transducer technology
• Mechanical engineering

Background:

• Liquid column resonance (LCR) transducers, or organ pipe transducers, generate underwater acoustic energy.
• Traditional LCR transducers use piezoelectric rings or Janus transducers as the driving source.
• Flextensional transducers (FTs) offer higher volume velocity at low frequencies.

Purpose of the Study:

• To introduce a Class IV flextensional transducer (FT) as a driving source for LCR transducers.
• To improve the stiffness of the elliptical metal pipes used in LCR transducers.
• To broaden the bandwidth and enhance the efficiency of LCR transducers.

Main Methods:

• A Class IV FT was employed as the driving source for an LCR transducer.
• An improved aluminum pipe with a cross-beam was designed to increase stiffness.
• The performance of the new LCR transducer was measured and compared to traditional designs.

Main Results:

• The fabricated LCR transducer prototype driven by a Class IV FT exhibited two resonance peaks between 700-2000 Hz.
• Transmitting voltage response values reached 132.1 dB and 137.8 dB (re 1 μPa/V @1 m).
• The FT-driven LCR transducer demonstrated superior efficiency and broadband characteristics compared to a ring-driven LCR transducer.

Conclusions:

• The Class IV FT is an effective driving source for LCR transducers, improving performance.
• The modified aluminum pipe design successfully addressed stiffness limitations.
• This enhanced LCR transducer design shows significant potential for underwater acoustic applications.