Study on the Underwater Acoustic Properties of Polyurethane Elastomer

  • Received : 2017.12.04
  • Accepted : 2017.12.18
  • Published : 2017.12.31


Two kinds of polyurethane elastomers were prepared and their acoustical properties underwater investigated. Their dynamic mechanical properties were measured using a dynamic mechanical analyzer. The sound speed and echo reduction in the 1-50 kHz frequency range were calculated from the data obtained using the analyzer. The sound speed, transmission and attenuation cofficient in 300-800 kHz were measured in a water-filled tank. Impedance tube experiments were performed to determine the reflective coefficient and echo reduction in the 3-8 kHz range. The polyurethane elastomer containing a hollow glass sphere showed a lower reflective coefficient and a higher echo reduction than the polyurethane elastomer without a filler.


polyurethane elastomer;dynamic mechanical properties;sound speed;echo reduction;attenuation constant


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Supported by : 부경대학교