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SUMMARY:Sound absorption coatings for maritime applications - Nicole Kessi
 ssoglou (University of New South Wales)
DTSTART:20230525T143000Z
DTEND:20230525T151500Z
UID:TALK198919@talks.cam.ac.uk
DESCRIPTION:Sound absorption coatings for underwater noise control applica
 tions are generally manufactured using a soft viscoelastic material with a
 n impedance match to the surrounding water. The multi-functional capabilit
 ies of a coating include its ability to absorb water-borne sound waves as 
 well as reduce the transmission of sound from a vibrating hull to the surr
 ounding water. Inclusions embedded within the soft material results in wav
 e scattering at frequencies around the resonance frequency of the inclusio
 ns\, which facilitates the conversion of longitudinal waves into shear wav
 es. This phenomenon results in the strong attenuation of sound within the 
 coating due to high shear damping and low shear modulus compared to the bu
 lk modulus for soft rubber-like materials. Inclusions are typically caviti
 es which exhibit monopole resonance associated with pulsating motion or ha
 rd scatterers which exhibit dipole resonance associated with translational
  motion. Multiple wave scattering also occurs between inclusions in proxim
 ity\, further enhancing sound dissipation within the coating. This present
 ation provides an overview of our approaches to predict the acoustic perfo
 rmance of sound absorption coatings for maritime applications and the phys
 ical mechanisms governing their acoustic performance.
LOCATION:Seminar Room 1\, Newton Institute
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