Realisation of a locally resonant metamaterial on the automobile panel structure to reduce noise radiation

Jung, Jaesoon; Kim, Hyun-Guk; Goo, Seongyeol; Chang, Kyoung-Jin; Wang, Semyung

doi:10.1016/j.ymssp.2018.11.050

Cited by 96 publications

(49 citation statements)

References 34 publications

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“…Experimental tests using a diffuse acoustic field showed that by using DVA resonators a reduction of up to 10 dB could be achieved at and around the ring mode frequency at the cost of about 5% mass increase of the fuselage panel. In another application, a DVA array with a subwavelength spacing was used to reduce the noise radiation of a car dash panel structure [10]. Different types of DVAs were used, tuned at three different frequencies, in an effort to obtain an improvement over a broader frequency range.…”

Section: Introductionmentioning

confidence: 99%

On the use of dynamic vibration absorbers to counteract the loss of sound insulation due to mass-spring-mass resonance effects in external thermal insulation composite systems

et al. 2021

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One of the common ways to increase the energy performance of existing buildings is to add a thermal insulation layer to their façade elements, which in turn is covered by a thin protecting cement plaster. Such an arrangement is commonly known as External Thermal Insulation Composite System (ETICS). This article studies the effect of an ETICS implementation induced mechanical resonance mechanism, which results in a loss of performance in the sound insulation spectrum. A mitigating approach is proposed, which is based on an array of dynamic vibration absorbers that were designed to counteract the decrease of the sound reduction index. Using a wavenumber domain approach combined with unit cell FEM-modelling employing Bloch-Floquet boundary conditions, numerical predictions are presented for the sound reduction index. A number of different dynamic vibration absorber designs were tested on a silicate cement brick wall in a transmission loss facility. The predictions are in good agreement with experimental data obtained by classical, microphone based acoustic isolation measurements and laser Doppler vibrometry.

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Section: Introductionmentioning

confidence: 99%

On the use of dynamic vibration absorbers to counteract the loss of sound insulation due to mass-spring-mass resonance effects in external thermal insulation composite systems

et al. 2021

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“…However, an anti-resonance-based design method generally requires relatively expensive computational resources to analyze the entire periodic structure. Using the stopband analysis, the response of the entire structure can be determined by the numerical analysis for the unit-cell structure [9][10][11][12][13]. According to Bloch's theorem, the response of a multi-celled structure consisting of a periodically repeated unit cell is expressed as the product of a periodic function and a plane wave [10].…”

Section: Introductionmentioning

confidence: 99%

“…Stopband analysis is an iterative eigenvalue analysis of periodic boundary conditions determined by each wave vector. Using stopband analysis of the unit-cell structure, a stopband in which no vibration mode exists for all wave vectors can be calculated, and the vibration is not propagated within the frequency range of the stopband [9][10][11]14].…”

Section: Introductionmentioning

confidence: 99%

A Numerical and Experimental Study on an Interconnected Metamaterial for Flexural Vibration Control Based on Modal Strain Energy

2021

Self Cite

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In this study, an interconnected metamaterial was proposed to suppress flexural vibration. The interconnected metamaterial can improve the manufacturing and installation processes in terms of convenience because it can be fabricated in the form of a modular multi-celled structure with a single-phase material. To evaluate the vibration reduction performance of the metamaterial, stopband analysis was performed, as it solves an iterative eigenvalue problem for the wave vector domain. In order to identify the Bloch mode that contributes to flexural vibration, a concept to extract the Bloch mode based on the modal strain energy was proposed. The vibration-reduction performance of the interconnected metamaterial was numerically verified by using a frequency-response analysis of the multi-celled structure. The interconnected metamaterial proposed in this study was fabricated by using a 3D printer. Finally, the vibration-reduction performance of the multi-celled structure was experimentally verified by using impact testing.

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“…Currently, there is few experimental work available in the literature investigating metamaterial performance for vibration attenuation applications (e.g. [5][6][7][8][9][10]) and most of them do not consider the effects of spatially correlated disorder on the band gap.…”

Section: Introductionmentioning

confidence: 99%

“…Also, a similar effect can be achieved by using a two or multiple degree-of-freedom array of resonators [20][21][22][23][24][25] instead of a single resonator design. Multi-resonators design have also been explored in more complex structures with encouraging results for industrial applications [9,10]. It has been shown that the break of periodicity introduced by the spatial variability of material and geometrical properties of metastructures creates a resonator mistuning which can induce wave trapping and thus greatly affecting the vibration attenuation performance by either band gap annihilation or attenuation bandwidth widening, depending on the imposed spatial profile [6].…”

Section: Introductionmentioning

confidence: 99%

Uncertainties in the attenuation performance of a multi-frequency metastructure from additive manufacturing

Fabro

Meng

Chronopoulos

2020

Mechanical Systems and Signal Processing

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Additive manufacturing has been used to propose several designs of phononic crystals and metamaterials due to the low cost to produce complex geometrical features. However, like any other manufacturing process, it can introduce material and geometrical variability in the nominal design and therefore affect the structural dynamic performance. Locally resonant metamaterials are typically designed such that the distributed resonators have the same natural frequency or, in the case of rainbow metastructures, a well-defined spatial profile. In this work, the effects of the break of periodicity caused by additive manufacturing variability on the attenuation performance of a multi-frequency metastructure is investigated. First, an experimental investigation on the manufacturing tolerances of test samples produced from a Selective Laser Sintering process are assessed and variability levels are used to propose a random field model for the metastructure. Subsequently, the stochastic model is used to investigate the vibration suppression performance of broadband multi-frequency metastructures. An analytical model based on a transfer matrix approach is used to calculate transfer receptance due to a point time harmonic force in a finite length metastructure, which is composed of evenly spaced nonsymmetric resonators attached to a beam with Π-shaped cross-section. This design creates a multifrequency metastructure, i.e. band gaps in more than one frequency band. Individual samples of the random fields are used to show that the mistuned resonators can change the vibration attenuation performance of the metastructure and that even small levels of variability, given by less than 1% for the masse and less than 3% for the Young's modulus can have a significant effect on the overall vibration attenuation performance of the metastructure when considered together. It is also shown that different spatial profiles can have a significant effect on the vibration attenuation performance in both band gaps. Therefore, the modelling of the uncertainty metastructures has to take into account the spatial correlation of the properties of the metastructure resonators. The obtained results are expected to be useful for further robust design in mass produced industrial applications.

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Realisation of a locally resonant metamaterial on the automobile panel structure to reduce noise radiation

Cited by 96 publications

References 34 publications

On the use of dynamic vibration absorbers to counteract the loss of sound insulation due to mass-spring-mass resonance effects in external thermal insulation composite systems

On the use of dynamic vibration absorbers to counteract the loss of sound insulation due to mass-spring-mass resonance effects in external thermal insulation composite systems

A Numerical and Experimental Study on an Interconnected Metamaterial for Flexural Vibration Control Based on Modal Strain Energy

Uncertainties in the attenuation performance of a multi-frequency metastructure from additive manufacturing

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