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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

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Pneumatically-Actuated Acoustic Metamaterials Based on Helmholtz Resonators.

Reza Hedayati¹, Sandhya Lakshmanan¹

¹Novel Aerospace Materials group, Faculty of Aerospace Engineering, Delft University of Technology (TU Delft), Kluyverweg 1, 2629 HS Delft, The Netherlands.

Materials (Basel, Switzerland)

|March 27, 2020

Summary

This summary is machine-generated.

This study demonstrates active acoustic metamaterials with tunable acoustic bandgaps. Pneumatic actuation shifted bandgaps and achieved significant noise reduction, paving the way for broader frequency targeting.

Keywords:

Helmholtz resonators acoustic metamaterial active noise control broadband noise attenuation pneumatic actuation

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Area of Science:

Acoustics
Materials Science
Mechanical Engineering

Background:

Metamaterials exhibit unique physical properties not found in nature.
Acoustic metamaterials can manipulate sound waves, offering advanced insulation capabilities through acoustic bandgaps.

Purpose of the Study:

To investigate the noise reduction performance of active acoustic metamaterials.
To demonstrate the tunability of acoustic bandgaps using pneumatic actuation.

Main Methods:

Additive manufacturing of metamaterial slabs connected to a pneumatic control unit.
Varying cavity depth within unit cells by adjusting pneumatic pressure (0.05 bar and 0.15 bar).
Measuring noise reduction in closed and open space configurations under different control conditions.

Main Results:

Acoustic bandgap shifted from 150-350 Hz to 300-600 Hz by altering cavity depth via pressure changes.
Peak noise attenuation of 20 dB in a closed system and 15 dB in an open system achieved at 500 Hz.
Demonstrated effective control over acoustic properties through pneumatic actuation.

Conclusions:

Pneumatically actuated acoustic metamaterials offer tunable noise reduction.
The ability to shift acoustic bandgaps is crucial for adaptive sound insulation.
Future work could involve tuning individual unit cells for broader frequency targeting.