The acoustic insulation performance of infinite and finite locally resonant metamaterial and phononic crystal plates

Belle, Lucas Van; Claeys, Claus; Deckers, Elke; Desmet, Wim

doi:10.1051/matecconf/201928309003

Cited by 5 publications

(7 citation statements)

References 7 publications

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“…Besides disappearing STL improvements, further increasing f res also leads to broadening zones of reduced STL after the STL peak, which is undesirable for noise reduction. Similar deviations between predicted infinite and finite plate STL performance enhancements were also found for the phononic crystal plate with periodic point mass additions in [23].…”

Section: Sound Transmission Losssupporting

confidence: 76%

“…This STL peak for the infinite periodic plate is now predicted in absence of a stop band, in a frequency range in which bending modes are again allowed and in which local vibration suppression no longer amounts to global vibration reduction. Similar observations were made for a phononic crystal plate with periodic point-mass additions in [23] in which the STL peak emerged Fig. 5: STL of the infinite plates for varying f res , showing a clear STL peak for all considered f res , followed by an STL dip, regardless of the sub-wavelength criterion or presence of a bending wave stop band (dashed lines).…”

Section: Sound Transmission Losssupporting

confidence: 75%

“…Also in [22] non-sub-wavelength resonator spacing is explicitly investigated, but only infinite periodic structure STL predictions are performed. Hence, to account for the influence of finite structure effects on the STL performance of metamaterial partitions of realizable dimensions, finite structure dimensions should be accounted for [4,17,23]. Aside from experimental validations of metamaterial partitions with subwavelength resonator spacing, however, the STL analysis of finite-sized metamaterial partitions of representative dimensions, in particular for non-sub-wavelength resonator spacing, is limited in current literature.…”

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confidence: 99%

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Implications of Nonsub-Wavelength Resonator Spacing on the Sound Transmission Loss Predictions of Locally Resonant Metamaterial Partitions

Belle

Claeys

Deckers

et al. 2020

Journal of Vibration and Acoustics

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Locally resonant metamaterials have recently emerged and gained attention in the field of noise control engineering. The addition of resonant structures to a flexible partition on a sub-wavelength scale enables a targeted frequency range of strongly reduced vibration and sound transmission. These structures have been widely studied and are typically analyzed using infinite periodic structure theory. The implications of non-sub-wavelength resonator spacing on the sound transmission loss of metamaterial partitions as well as on the representativeness of the infinite periodic structure modeling are, however, less well known. In this technical brief it is shown that, although a shifted sound transmission loss peak can be predicted for partitions with non-sub-wavelength resonator spacing when using infinite periodic structure modeling, the sound transmission loss enhancement is not guaranteed for their finite structure counterparts.

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Section: Sound Transmission Losssupporting

confidence: 76%

Section: Sound Transmission Losssupporting

confidence: 75%

mentioning

confidence: 99%

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Implications of Nonsub-Wavelength Resonator Spacing on the Sound Transmission Loss Predictions of Locally Resonant Metamaterial Partitions

Belle

Claeys

Deckers

et al. 2020

Journal of Vibration and Acoustics

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“…The use of distributed resonators has also been investigated as an option to create MMs for both thin [23] and thick [24] plate structures using the plane wave expansion (PWE) method to achieve an improved sound transmission loss (STL). Furthermore, Van Belle et al have demonstrated [25] that both PCs and MMs are able to improve the STL of infinite plates. For MMs, this reduction occurs inside the band gap regions, due to sub-wavelength vibration suppression, while, for PCs, these occur outside the band gap regions due to specific vibration patterns.…”

Section: Introductionmentioning

confidence: 99%

Bioinspired periodic panels optimized for acoustic insulation

Poggetto

Pugno

Arruda

2022

Phil. Trans. R. Soc. A.

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The design of structures that can yield efficient sound insulation performance is a recurring topic in the acoustic engineering field. Special attention is given to panels, which can be designed using several approaches to achieve considerable sound attenuation. Previously, we have presented the concept of thickness-varying periodic plates with optimized profiles to inhibit flexural wave energy propagation. In this work, motivated by biological structures that present multiple locally resonant elements able to cause acoustic cloaking, we extend our shape optimization approach to design panels that achieve improved acoustic insulation performance using either thickness-varying profiles or locally resonant attachments. The optimization is performed using numerical models that combine the Kirchhoff plate theory and the plane wave expansion method. Our results indicate that panels based on locally resonant mechanisms have the advantage of being robust against variation in the incidence angle of acoustic excitation and, therefore, are preferred for single-leaf applications. This article is part of the theme issue ‘Wave generation and transmission in multi-scale complex media and structured metamaterials (part 2)’.

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“…By embedding resonant elements into a host structure, a material structure can be obtained, which shows stop band behavior in tunable frequency ranges, related to the natural frequency of the added resonant elements [4]. In these stop bands, no structural waves can freely propagate into the system, hence vibrations are attenuated, resulting in reduction of acoustic radiation and sound transmission [5,6,7]. Therefore, retaining low mass and low volume, locally resonant metamaterials can outperform the common NVH solutions, especially at the low frequency range.…”

Section: Introductionmentioning

confidence: 99%

Reducing Vehicle Interior NVH by Means of Locally Resonant Metamaterial Patches on Rear Shock Towers

Sangiuliano

Claeys

Deckers

et al. 2019

SAE Technical Paper Series

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Stringent regulations for CO2 emissions and noise pollution reduction demand lighter and improved Noise, Vibration Harshness (NVH) solutions in automotive industries. Designing light, compact and, at the same time, improved NVH solutions is often a challenge, as low noise and vibration levels often require heavy and bulky additions, especially to be effective in the low frequency regime. Recently, locally resonant metamaterials have emerged among the novel NVH solutions because of their performant NVH properties combined with lightweight and compact design. Due to the characteristic of stop band behavior, frequency ranges where free wave propagation is inhibited, metamaterials can beat the mass law, be it at least in some tunable frequency ranges. Previously the authors demonstrated how metamaterials can reduce the vibrations in a simplified shock tower upon shaker excitation. In this work, the authors apply the metamaterial concept on the real rear shock towers of a vehicle. In order to be able to benchmark the solution, a test vehicle is chosen, which is equipped in its commercial version with a 1.46 kg tuned vibration absorber (TVA) on each of the rear shock towers as NVH solution. It is shown that the metamaterial solution allows to achieve similar interior NVH performance, while reducing the added mass by 48%. The metamaterial additions are realized through additive manufacturing and they are designed to be effective around 190 Hz, as was the case for the original solution. Both experimental results and numerical validation of a road test are presented.

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The acoustic insulation performance of infinite and finite locally resonant metamaterial and phononic crystal plates

Cited by 5 publications

References 7 publications

Implications of Nonsub-Wavelength Resonator Spacing on the Sound Transmission Loss Predictions of Locally Resonant Metamaterial Partitions

Implications of Nonsub-Wavelength Resonator Spacing on the Sound Transmission Loss Predictions of Locally Resonant Metamaterial Partitions

Bioinspired periodic panels optimized for acoustic insulation

Reducing Vehicle Interior NVH by Means of Locally Resonant Metamaterial Patches on Rear Shock Towers

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