An adjustable acoustic metamaterial cell using a magnetic membrane for tunable resonance
Abstract Acoustic metamaterials are growing in popularity for sound applications including noise control. Despite this, there remain significant challenges associated with the fabrication of these materials for the sub-100 Hz regime, because acoustic metamaterials for such frequencies typically requ...
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Nature Portfolio
2024-07-01
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| Series: | Scientific Reports |
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| Online Access: | https://doi.org/10.1038/s41598-024-65819-2 |
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| author | Alicia Gardiner Roger Domingo-Roca James F. C. Windmill Andrew Feeney |
| author_facet | Alicia Gardiner Roger Domingo-Roca James F. C. Windmill Andrew Feeney |
| author_sort | Alicia Gardiner |
| collection | DOAJ |
| description | Abstract Acoustic metamaterials are growing in popularity for sound applications including noise control. Despite this, there remain significant challenges associated with the fabrication of these materials for the sub-100 Hz regime, because acoustic metamaterials for such frequencies typically require sub-mm scale features to control sound waves. Advances in additive manufacturing technologies have provided practical methods for rapid fabrication of acoustic metamaterials. However, there is a relatively high sensitivity of their resonant characteristics to sub-mm deviations in geometry, pushing the limits of additive manufacturing. One way of overcoming this is via active control of device resonance. Here, an acoustic metamaterial cell with adjustable resonance is demonstrated for the sub-100 Hz regime. A functionally superparamagnetic membrane—devised to facilitate the fabrication process by eliminating magnetic poling requirements—is engineered using stereolithography, and its mechanical and acoustic properties are experimentally measured using laser Doppler vibrometry and electret microphone testing, with a mathematical model developed to predict the cell response. It is demonstrated that an adjustable magnetic acoustic metamaterial can be fabricated at ultra-subwavelength dimensions ( $$\le \lambda$$ ≤ λ /77.5), exhibiting adjustable resonance from 88.73 to 86.63 Hz. It is anticipated that this research will drive new innovations in adjustable metamaterials, including wider frequency ranges. |
| format | Article |
| id | doaj-art-e222795366b74ea38b7d871fce453843 |
| institution | Kabale University |
| issn | 2045-2322 |
| language | English |
| publishDate | 2024-07-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj-art-e222795366b74ea38b7d871fce4538432025-01-26T12:34:55ZengNature PortfolioScientific Reports2045-23222024-07-0114111010.1038/s41598-024-65819-2An adjustable acoustic metamaterial cell using a magnetic membrane for tunable resonanceAlicia Gardiner0Roger Domingo-Roca1James F. C. Windmill2Andrew Feeney3Centre for Medical and Industrial Ultrasonics, James Watt School of Engineering, University of GlasgowCentre for Ultrasonic Engineering, Department of Electronic & Electrical Engineering, University of StrathclydeCentre for Ultrasonic Engineering, Department of Electronic & Electrical Engineering, University of StrathclydeCentre for Medical and Industrial Ultrasonics, James Watt School of Engineering, University of GlasgowAbstract Acoustic metamaterials are growing in popularity for sound applications including noise control. Despite this, there remain significant challenges associated with the fabrication of these materials for the sub-100 Hz regime, because acoustic metamaterials for such frequencies typically require sub-mm scale features to control sound waves. Advances in additive manufacturing technologies have provided practical methods for rapid fabrication of acoustic metamaterials. However, there is a relatively high sensitivity of their resonant characteristics to sub-mm deviations in geometry, pushing the limits of additive manufacturing. One way of overcoming this is via active control of device resonance. Here, an acoustic metamaterial cell with adjustable resonance is demonstrated for the sub-100 Hz regime. A functionally superparamagnetic membrane—devised to facilitate the fabrication process by eliminating magnetic poling requirements—is engineered using stereolithography, and its mechanical and acoustic properties are experimentally measured using laser Doppler vibrometry and electret microphone testing, with a mathematical model developed to predict the cell response. It is demonstrated that an adjustable magnetic acoustic metamaterial can be fabricated at ultra-subwavelength dimensions ( $$\le \lambda$$ ≤ λ /77.5), exhibiting adjustable resonance from 88.73 to 86.63 Hz. It is anticipated that this research will drive new innovations in adjustable metamaterials, including wider frequency ranges.https://doi.org/10.1038/s41598-024-65819-2Acoustic metamaterialsMagnetic membranesResonance tunabilityStereolithography printingSuperparamagnetism |
| spellingShingle | Alicia Gardiner Roger Domingo-Roca James F. C. Windmill Andrew Feeney An adjustable acoustic metamaterial cell using a magnetic membrane for tunable resonance Scientific Reports Acoustic metamaterials Magnetic membranes Resonance tunability Stereolithography printing Superparamagnetism |
| title | An adjustable acoustic metamaterial cell using a magnetic membrane for tunable resonance |
| title_full | An adjustable acoustic metamaterial cell using a magnetic membrane for tunable resonance |
| title_fullStr | An adjustable acoustic metamaterial cell using a magnetic membrane for tunable resonance |
| title_full_unstemmed | An adjustable acoustic metamaterial cell using a magnetic membrane for tunable resonance |
| title_short | An adjustable acoustic metamaterial cell using a magnetic membrane for tunable resonance |
| title_sort | adjustable acoustic metamaterial cell using a magnetic membrane for tunable resonance |
| topic | Acoustic metamaterials Magnetic membranes Resonance tunability Stereolithography printing Superparamagnetism |
| url | https://doi.org/10.1038/s41598-024-65819-2 |
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