In the last decades, coiled-up resonators have become popular within the metamaterial research community for narrow band, low frequency resonances combined to sub-wavelength thickness. Such structures are particularly suited to one of the most widespread manufacturing processes, i.e. PET-based 3D printing. Acoustic performance of coiled-up resonators depends on the geometrical parameters’ variation, which is influenced by thermo-hygrometric conditions; however,the deformation itself needs to be further investigated. For this reason, the present paper evaluates the correlation between temperature, relative humidity, and the geometrical parameters’ (spiral length and hole diameter) deformations and, consequently, the acoustic performance of a 3D printed coiled-up resonator. A combined approach through analytical, numerical, and experimental measurements quantified the coefficient increasing the temperature (T = 10 – 50 °C) , and the relative humidity (RH = 20 – 50 – 80 %) of the samples. Relative humidity variations turned neglectable discrepancies on sound absorption’s peaks. On the other hand, the increase in temperature caused a frequency peaks’ shift following an exponential trend. This study can be a starting point for practical applications when the thermos-hygrometric variations are of concern.

The influence of thermo-hygrometric conditions on metamaterials' acoustic performance: an investigation on a 3-D printed coiled-up resonator / Matteo Cingolani, Gioia Fusaro, Massimo Garai. - ELETTRONICO. - (2022), pp. 1-6. (Intervento presentato al convegno INTERNOISE 2022 tenutosi a Glasgow nel 21-24 August 2022).

The influence of thermo-hygrometric conditions on metamaterials' acoustic performance: an investigation on a 3-D printed coiled-up resonator

Matteo Cingolani
Primo
;
Gioia Fusaro;Massimo Garai
2022

Abstract

In the last decades, coiled-up resonators have become popular within the metamaterial research community for narrow band, low frequency resonances combined to sub-wavelength thickness. Such structures are particularly suited to one of the most widespread manufacturing processes, i.e. PET-based 3D printing. Acoustic performance of coiled-up resonators depends on the geometrical parameters’ variation, which is influenced by thermo-hygrometric conditions; however,the deformation itself needs to be further investigated. For this reason, the present paper evaluates the correlation between temperature, relative humidity, and the geometrical parameters’ (spiral length and hole diameter) deformations and, consequently, the acoustic performance of a 3D printed coiled-up resonator. A combined approach through analytical, numerical, and experimental measurements quantified the coefficient increasing the temperature (T = 10 – 50 °C) , and the relative humidity (RH = 20 – 50 – 80 %) of the samples. Relative humidity variations turned neglectable discrepancies on sound absorption’s peaks. On the other hand, the increase in temperature caused a frequency peaks’ shift following an exponential trend. This study can be a starting point for practical applications when the thermos-hygrometric variations are of concern.
2022
Internoise 2022 - 51st International Congress and Exposition on Noise Control Engineering
1
6
The influence of thermo-hygrometric conditions on metamaterials' acoustic performance: an investigation on a 3-D printed coiled-up resonator / Matteo Cingolani, Gioia Fusaro, Massimo Garai. - ELETTRONICO. - (2022), pp. 1-6. (Intervento presentato al convegno INTERNOISE 2022 tenutosi a Glasgow nel 21-24 August 2022).
Matteo Cingolani, Gioia Fusaro, Massimo Garai
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/916448
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