Design of vibration isolators by using the Bragg scattering and local resonance band gaps in a layered honeycomb meta-structure

Yang, Jin; Jia, Xinyu; Wu, Qianqian; He, Xiaoqiao; Yu, Guo-Cai; Wu, Linzhi; Luo, Bailu

doi:10.1016/j.jsv.2021.116721

Cited by 28 publications

(8 citation statements)

References 37 publications

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“…Subjectto : x i = 0 or 1 (9) where f represents the maximum relative bandwidth, which is dimensionless and simplified from the center frequency between a given pair of adjacent frequency bands. X represents the chromosome of the topology optimization problem under study and k is the wave vector.…”

Section: Improved Genetic Algorithmmentioning

confidence: 99%

“…For example, the wavelength of low-frequency noise in the air at 20 Hz is about 17 m. In traditional vibration and noise-reduction devices, such as sound barriers, the required thickness of the sound barrier is far greater than the size of general building wall structures and does not have practicality. Therefore, it is difficult to effectively suppress low-frequency vibration and noise using traditional vibration and noise-reduction devices [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

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Topological Design of Two-Dimensional Phononic Crystals Based on Genetic Algorithm

et al. 2023

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Phononic crystals are a kind of artificial acoustic metamaterial whose mass density and elastic modulus are periodically arranged. The precise and efficient design of phononic crystals with specific bandgap characteristics has attracted increasing attention in past decades. In this paper, an improved adaptive genetic algorithm is proposed for the reverse customization of two-dimensional phononic crystals designed to maximize the relative bandwidth at low frequencies. The energy band dispersion relation and transmission loss of the optimal structure are calculated by the finite-element method, and the effective wave-attenuation effect in the bandgap range is verified. This provides a solution for the custom-made design of acoustic metamaterials with excellent low-frequency bandgap sound insulation or other engineering applications.

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Section: Improved Genetic Algorithmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Topological Design of Two-Dimensional Phononic Crystals Based on Genetic Algorithm

et al. 2023

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“…It has potential application value in sound insulation, noise reduction engineering and buffer protection engineering. In summary, these design theories of local resonance coupling with Bragg scattering [29,30], double local resonance [31], and trampoline effect [32] have been applied to enlarge the bandgap of structures.…”

Section: Introductionmentioning

confidence: 99%

Auxetic hybrid metamaterial with tunable elastic wave bandgap

Chen,

Tao,

Luo

et al. 2024

Smart Mater. Struct.

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Auxetic metamaterials have shown good stability and uniform deformation capabilities against influences (vibration, temperature change, load change), making them significant in maintaining and adjusting the bandgap of phonon crystals. The low-frequency and broadband are the important goals of phonon crystals. For most traditional re-entrant honeycomb structures (T-RHS), the bandgap range is narrow and tunability is poor. Here, an auxetic hybrid structure with tunable acoustic bandgap (AHS-T) consisting of periodic mass inclusions integrated with traditional re-entrant honeycomb and chiral hybrid is proposed. Aiming at investigating the tunability of the bandgap in the low-frequency range. Compared with T-RHS, the bandgap real-time adjustment and wider bandwidth of the AHS-T be realized during compression and tension. The numerical results show that the bandgap of the AHS-T can be flexibly tailored by reasonably adjusting the strain and geometrical configurations of AHS-T. The bandwidth of AHS-T can be increased to 87.1% when the bottom diameter and column height H of the scatterer are changed reasonably. Moreover, the deformation behavior of auxetic material has an auxiliary effect on expanding the bandwidth. Compared with the structure which is not subjected to load, the adjustable amplitude of the bandgap is 41%. The findings of this work provide a design idea for manipulating elastic waves in dynamic environment.

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“…Wave propagation and the determination of the band gaps are possible with the use of a large number of numerical methods. These include the plane wave expansion method (PWE) [38], one-dimensional transmission line model (TLM) [39], transfer matrix method (TMM) [40], [41], the multiple scattering theory (MST) [42], the finite element method (FEM) [43]- [45], a boundary element method (BEM) [46], [47] and the finite difference time domain (FDTD) [48], [49]. The aim of the work was to determine how the propagation of a mechanical wave in quasi-two-dimensional phononic…”

Section: Introductionmentioning

confidence: 99%

Influence of spatial distribution and the type of material on the occurrence of bandgaps in phononic crystals

Garus,

Sochacki,

Kwiatoń

et al. 2023

Bulletin of the Polish Academy of Sciences Technical Sciences

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The study investigated the effect of the fill factor, lattice constant, and the shape and type of meta-atom material on the reduction of mechanical wave transmission in quasi-two-dimensional phononic structures. A finite difference algorithm in the time domain was used for the analysis, and the obtained time series were converted into the frequency domain using the discrete Fourier transform. The use of materials with large differences in acoustic impedance allowed to determine the influence of the meta-atom material on the propagation of the mechanical wave.

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Design of vibration isolators by using the Bragg scattering and local resonance band gaps in a layered honeycomb meta-structure

Cited by 28 publications

References 37 publications

Topological Design of Two-Dimensional Phononic Crystals Based on Genetic Algorithm

Topological Design of Two-Dimensional Phononic Crystals Based on Genetic Algorithm

Auxetic hybrid metamaterial with tunable elastic wave bandgap

Influence of spatial distribution and the type of material on the occurrence of bandgaps in phononic crystals

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