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Magnetic Damping

Magnetic Damping

Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...

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Sharkskin-Inspired Magnetoactive Reconfigurable Acoustic Metamaterials.

Kyung Hoon Lee¹, Kunhao Yu¹, Hasan Al Ba'ba'a¹

¹Sonny Astani Department of Civil and Environmental Engineering, University of Southern California, Los Angeles, CA 90089, USA.

Research (Washington, D.C.)

|February 29, 2020

Summary

This summary is machine-generated.

Researchers developed novel active acoustic metamaterials using magnetic fields to control sound transmission. These untethered devices, inspired by sharkskin, enable on-demand switching of acoustic properties for applications like noise control.

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Area of Science:

Acoustic Metamaterials
Magnetoactive Materials
Wave Physics

Background:

Existing acoustic metamaterials have fixed configurations, limiting property modulation after fabrication.
Active acoustic metamaterials offer tunable properties but often require tethered actuation (e.g., mechanical, pneumatic).
Untethered physical stimuli for active switching in acoustic metamaterials remain largely unexplored.

Purpose of the Study:

To present a new class of active acoustic metamaterials switchable via untethered magnetic fields.
To demonstrate on-demand control of acoustic transmission, wave guiding, logic operations, and reciprocity.
To introduce stimuli-controlled reconfigurable acoustic metadevices.

Main Methods:

Development of magnetoactive Mie resonator pillar (MRP) arrays inspired by sharkskin denticles.
Utilizing magnetoactive elastomers with wavy air channels to create artificial Mie resonance.
Tuning MRPs between vertical (acoustic forbidding) and bent (acoustic conducting) states using magnetic fields.

Main Results:

Demonstrated active switching of acoustic transmission and wave guiding by magnetically deforming MRPs.
Achieved on-demand closure of the acoustic bandgap by bending MRPs with magnetic fields.
Successfully designed and implemented stimuli-controlled reconfigurable acoustic switches, logic gates, and diodes.

Conclusions:

Introduced the first generation of active acoustic metadevices controlled by untethered stimuli (magnetic fields).
The proposed paradigm enables on-demand, reconfigurable acoustic functionalities.
Potential for broad engineering applications including noise control, audio modulation, and sonic camouflage.