Improving Sound Absorption Properties Using 3D-Printed ASA Concentric Tubular Structures with Intermediate Lattice...

Area of Science:

• Acoustics and Materials Science
• Additive Manufacturing
• Environmental Engineering

Background:

• Noise pollution poses significant health risks, necessitating effective mitigation strategies.
• Passive sound absorption materials are crucial for noise reduction.
• 3D printing enables the creation of complex structures for advanced acoustic applications.

Purpose of the Study:

• To investigate the sound absorption performance of novel 3D-printed concentric tubular structures.
• To evaluate the impact of design parameters on acoustic properties.
• To explore the potential of acrylonitrile styrene acrylate (ASA) for noise reduction.

Main Methods:

• Experimental evaluation of sound absorption using a two-microphone acoustic impedance tube (200-1600 Hz).
• Fabrication of concentric tubular structures with intermediate lattice inserts using 3D printing.
• Systematic variation of design parameters: number of tubes, sample height, strut diameter, and back air cavity thickness.

Main Results:

• Sound absorption performance is highly dependent on design parameters.
• Average sound absorption coefficient increased with the number of concentric tubes, reaching 0.264 for five tubes.
• A peak sound absorption of 0.623 was achieved with specific dimensions (2 tubes, 3mm strut, 30mm height, 10mm cavity) at ~1548 Hz.
• Increased strut diameter and sample height generally improved absorption.
• Back air cavity significantly shifted absorption peaks to lower frequencies.

Conclusions:

• 3D-printed concentric tubular structures show significant potential for effective sound absorption.
• Design optimization is key to maximizing noise reduction performance.
• The inclusion of a back air cavity is effective for enhancing low-frequency sound absorption.