A decoupling-design strategy for high sound absorption in subwavelength structures with air ventilation

Area of Science:

• Acoustics
• Materials Science
• Mechanical Engineering

Background:

• Ventilated structures often face challenges in achieving effective sound absorption due to air passage.
• Traditional soundproofing methods may compromise airflow or acoustic performance.

Purpose of the Study:

• To propose and demonstrate a novel strategy for broadband high sound absorption in ventilated structures.
• To design and fabricate a sound-absorbing sample utilizing a decoupling approach with coiled channels.

Main Methods:

• A decoupling design strategy was employed, separating sound blocking and sound absorption functions into distinct coiled-channel structures.
• A sound-absorbing sample incorporating air ventilation was fabricated based on this strategy.
• Experimental validation was performed to assess the acoustic performance and absorption bandwidth.

Main Results:

• The fabricated sample demonstrated high sound absorption capabilities.
• The strategy successfully expanded the sound absorption bandwidth by integrating different absorptive channels.
• The proposed method proved effective for ventilated structures.

Conclusions:

• The decoupling design of coiled-channel structures offers a viable route for achieving broadband high sound absorption in ventilated applications.
• This approach provides a new pathway for developing advanced acoustic materials with integrated ventilation.
• The findings contribute to the field of acoustic metamaterials and noise control solutions.