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Updated: Jun 5, 2025

Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

Published on: June 28, 2024

An acoustic metamaterial with space-time modulated densitya).

Xiaohui Zhu¹, Chen Shen²

¹Huzhou Key Laboratory of Green Energy Materials and Battery Cascade Utilization, School of Intelligent Manufacturing, Huzhou College, Huzhou, Zhejiang 313000, China.

The Journal of the Acoustical Society of America

|December 13, 2024

Summary

This study introduces a novel acoustic metamaterial using space-time modulation to control wave behavior. The proposed system demonstrates nonreciprocal functionalities like unidirectional amplification and frequency conversion.

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Area of Science:

Acoustics
Metamaterials
Wave physics

Background:

Space-time modulation offers advanced control over wave phenomena.
Nonreciprocal wave manipulation is a key area in wave physics.

Purpose of the Study:

To propose and analyze a one-dimensional space-time modulated membrane system.
To realize an acoustic metamaterial with space-time modulated effective density.
To investigate nonreciprocal acoustic functionalities.

Main Methods:

Effective medium method
Transfer matrix method
Time-domain simulation

Main Results:

The system supports unidirectional parametric amplification.
The system supports parametric frequency conversion.
Nonreciprocal acoustic functionalities are achieved through specific modulation profiles.

Conclusions:

The proposed space-time modulated membrane system is a viable acoustic metamaterial.
The system enables advanced nonreciprocal wave control.
Different modulation profiles lead to distinct functionalities.