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1977•The Journal of the Acoustical Society of AmericaOpen access

Low-frequency spherical-shell projectors

J. B. Lee

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Abstract

The spherical-shell projector comprises a piezoelectric ceramic ring driving two concave spherical shell segments in flexure. One model resonant at 600 Hz in water weighs 15 kg and delivers a souce level of 201.5 dB re 1 μPa at 1 m. Its mechanical Q is 5 and efficiency 80% at resonance. An axially-symmetric finite element model is being used to study the performance of spherical-shell projectors and generally good agreement is achieved between the calculated and experimental results.

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The spherical-shell projector comprises a piezoelectric ceramic ring driving two concave spherical shell segments in flexure. One model resonant at 600 Hz in water weighs 15 kg and delivers a souce level of 201.5 dB re 1 μPa at 1 m. Its mechanical Q is 5 and efficiency 80% at resonance. An axially-symmetric finite element model is being used to study the performance of spherical-shell projectors and generally good agreement is achieved between the calculated and experimental results.

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Available abstract

The spherical-shell projector comprises a piezoelectric ceramic ring driving two concave spherical shell segments in flexure. One model resonant at 600 Hz in water weighs 15 kg and delivers a souce level of 201.5 dB re 1 μPa at 1 m. Its mechanical Q is 5 and efficiency 80% at resonance. An axially-symmetric finite element model is being used to study the performance of spherical-shell projectors and generally good agreement is achieved between the calculated and experimental results.

Key concepts: Spherical shell, Shell (structure), Projector, Axial symmetry, Piezoelectricity, SPHERES, Finite element method, Resonance (particle physics)

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