Temperature-dependent sound absorption characteristics of geometrically regular microlattice materials

Area of Science:

• Materials Science
• Acoustics
• Nanotechnology

Background:

• Multilayer microlattice plates are engineered using micro and nanotechnology for regular geometric structures.
• These materials show promise as novel acoustic metamaterials for sound absorption applications.

Purpose of the Study:

• To investigate the temperature-dependent sound absorption characteristics of microlattice materials.
• To explore the underlying mechanisms and optimize performance for high-temperature environments.

Main Methods:

• Development and validation of a semi-theoretical model using an improved transfer matrix method.
• Numerical simulations and experimental implementations to analyze sound absorption.
• Investigation of sound pressure, particle velocity, temperature changes, and thermal-viscous power dissipation.

Main Results:

• Microlattice materials exhibit enhanced sound absorption in low and broadband frequencies compared to irregular porous absorbers.
• Optimized geometric configurations lead to improved sound absorption at elevated temperatures.
• Sound absorption performance is enhanced, not degraded, at high temperatures with proper design.

Conclusions:

• Microlattice materials represent a significant advancement in acoustic metamaterials, particularly for high-temperature applications.
• The temperature-dependent behavior and optimization strategies provide valuable insights for designing advanced sound absorbers.
• This research facilitates the development of acoustic metamaterials meeting stringent high-temperature requirements.