Finite Element Solution for Dynamic Mechanical Parameter Influence on Underwater Sound Absorption of...

Area of Science:

• Materials Science
• Acoustics
• Environmental Science

Background:

• Underwater noise pollution from human activities severely impacts marine ecosystems.
• Polyurethane-based (PU-based) composites are increasingly used for underwater sound absorption due to their damping properties.
• A clear understanding of the relationship between dynamic mechanical parameters and sound absorption in PU-based composites is lacking.

Purpose of the Study:

• To investigate the influence of dynamic mechanical parameters on the underwater sound absorption performance of PU-based composites.
• To elucidate the mechanism linking material properties to sound absorption.
• To provide guidance for developing advanced underwater sound-absorbing materials.

Main Methods:

• Fabrication of a finite element model.
• Verification of the model using acoustic pulse tube tests.
• Systematic study of dynamic mechanical parameters' influence on sound absorption in the frequency domain.

Main Results:

• Internal friction of molecular segments and structural stiffness are key contributors to sound energy dissipation in PU-based composites.
• Sound absorption peaks and coefficients can be significantly altered by adjusting dynamic mechanical parameters.
• A clear correlation between damping properties and sound absorption performance was established.

Conclusions:

• Dynamic mechanical parameters critically influence the underwater sound absorption capabilities of PU-based composites.
• Understanding these relationships allows for targeted material design for enhanced sound absorption.
• This research offers valuable insights for the fabrication and application of PU-based composites in mitigating underwater noise pollution.