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3D PRINTED MEMBRANE-TYPE ACOUSTIC METAMATERIALS FOR SMALL-SCALE APPLICATIONS
Cecilia Casarini, Ben Tiller, James F.C. Windmill and Joseph C. Jackson
Centre for Ultrasonic Engineering Department of Electronic & Electrical Engineering
University of Strathclyde, Glasgow UK
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OUTLINE
q Background and Motivations
q Acoustic metamaterials based on Helmholtz resonators
q 3D printing membranes
q Membranes-type metamaterials
q Conclusions and Future Work
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3D PRINTED MEMBRANE-TYPE ACOUSTIC METAMATERIALS FOR SMALL-SCALE APPLICATIONS
BACKGROUND AND MOTIVATIONS
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3D PRINTED MEMBRANE-TYPE ACOUSTIC METAMATERIALS FOR SMALL-SCALE APPLICATIONS
BACKGROUND AND MOTIVATIONS
• Lightweight, small scale • There is a large range of materials to
choose from with different properties • It is possible to change the resonance
frequency by modifying the design (DMM, etc.)
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3D PRINTED MEMBRANE-TYPE ACOUSTIC METAMATERIALS FOR SMALL-SCALE APPLICATIONS
BACKGROUND AND MOTIVATIONS
• Lightweight, small scale • There is a large range of materials to
choose from with different properties • It is possible to change the resonance
frequency by modifying the design (DMM, active membranes, etc.)
• The need for developing 3D printing techniques for membrane-type acoustic metamaterials has been highlighted in papers
• 3D printing gives a high degree of similarity among the samples, which is difficult to obtain in manually glued membranes
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Lemoult, F., Kaina, N., Fink, M., and Lerosey, G. (2013). Wave propagation control at the deep subwavelength scale in metamaterials. Nat Phys, 9(1):55{60.
ACOUSTIC METAMATERIALS BASED ON HELMHOLTZ RESONATORS
Casarini, C., Windmill, J.F.C., Jackson, J.C. (2017) 3D printed small-scale acoustic metamaterials based on Helmholtz resonators with tuned overtones. In IEEE Sensors Conference, 2017
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3D PRINTING MEMBRANES
Upside-‐Down Stereolithography
hFps://www.asiga.com
CAD Model
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3D PRINTING MEMBRANES
Upside-‐Down Stereolithography
hFps://www.asiga.com
CAD Model
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3D PRINTING MEMBRANES
Upside-‐Down Stereolithography
hFps://www.asiga.com
CAD Model
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3D PRINTING MEMBRANES
Thickness – Exposure Time Materials Properties
PMMA PEGDA BEMA
Young’s Modulus (Pa)
1.8 X 109 50 X 106 3 X 106
Density (Kg/m3)
1180 1180 1099
Poisson’s Ratio
0.33 0.35 0.4
• Trial and error process
• Increasing exposure time increases the
thickness
• Increasing the quantity of absorber
decreases the thickness
• Different materials need different
exposure times and amount of absorber
to obtain the same thickness
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• Membranes increase and broaden the bandgap
• The resonance frequency is higher than expected due to stress added by the 3D printer
ACOUSTIC METAMATERIALS BASED ON 3D PRINTED MEMBRANES
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CONCLUSIONS • We successfully 3D printed thin membranes. • By printing the membranes on the bottom of Helmholtz resonators it
was possible to achieve broader and deeper band gaps. • However, the resonance frequency of the membranes was higher
than the one predicted analytically.
FUTURE WORK
• To test the sound transmission loss through impedance tube or other measurement techniques.
• To design and print acoustic metamaterials based on different kind of membranes and materials.
• To finally build and test audio devices and conduct psychoacoustic evaluations.
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CONCLUSIONS • We successfully 3D printed thin membranes. • By printing the membranes on the bottom of Helmholtz resonators it
was possible to achieve broader and deeper band gaps. • However, the resonance frequency of the membranes was higher
than the one predicted analytically.
FUTURE WORK
• To test the sound transmission loss through impedance tube or other measurement techniques.
• To design and print acoustic metamaterials based on different kind of membranes and materials.
• To finally build and test audio devices and conduct psychoacoustic evaluations.
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CONCLUSIONS • We successfully 3D printed thin membranes. • By printing the membranes on the bottom of Helmholtz resonators it
was possible to achieve broader and deeper band gaps. • However, the resonance frequency of the membranes was higher
than the one predicted analytically.
FUTURE WORK
• To test the sound transmission loss through impedance tube or other measurement techniques.
• To design and print acoustic metamaterials based on different kind of membranes and materials.
• To finally build and test audio devices and conduct psychoacoustic evaluations.