Sonic and Photonic Crystals

Chen, Lien-Wen; Yeh, Jui‐Feng

doi:10.3390/cryst10110994

Cited by 2 publications

(2 citation statements)

References 20 publications

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“…[9] In this context, scholars have developed phononic crystals [10][11][12][13] with good acoustic properties based on photonic crystals. [14][15][16][17] A rational periodic arrangement and structural design can lead to mechanical modes and a frequency window that is strongly scattered by multiple scattered waves and disruptive interference prohibits the propagation of any phonon. [18] This frequency window is called the forbidden band and also called the bandgap.…”

Section: Introductionmentioning

confidence: 99%

Low‐Frequency Vibration and Noise Reduction and Wave Propagation Properties of Hexagonal Hybrid Metamaterials with Local Resonance Strips

Cao

Yang

et al. 2023

Physica Status Solidi (b)

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Based on the idea of local resonance, a class of hybrid acoustic metamaterials with interposed resonant strips is proposed in this article, and the bandgap characteristics and transmission properties are calculated by combining Bloch's theorem and lattice theory. The new structure is verified to have low‐frequency damping and noise reduction capability through the analysis of the stress cloud diagram at specific frequencies in the bandgap range. A comprehensive analysis of vibration modes, phase constant surfaces, group velocity, phase velocity, and wave propagation direction diagram is used to explore the wave propagation and bandgap opening mechanism, providing technical support and theoretical basis for subsequent bandgap optimization and structural improvement. The results show that this structure can open multiple bandgaps in the low‐frequency range below 500 Hz, and the stepped design of the single‐cell structure and the introduction of resonant strips provide a new design idea for low‐frequency vibration and noise reduction.

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Section: Introductionmentioning

confidence: 99%

Low‐Frequency Vibration and Noise Reduction and Wave Propagation Properties of Hexagonal Hybrid Metamaterials with Local Resonance Strips

Cao

Yang

et al. 2023

Physica Status Solidi (b)

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“…However, the band gap of the local resonance PnCs can be two or more orders smaller than the spatial modulations of the PnCs [11]. The geometrical sizes [12,13], the physical properties [14], the material distributions [15][16][17] and the symmetries [18,19] can decide the band gap characteristics in the design of PnCs.…”

Section: Introductionmentioning

confidence: 99%

Band gap characteristics of friction stir additive manufactured phononic crystals

Tan¹,

Zhang²

2022

Phys. Scr.

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Additive Manufacturing (AM) is widely used to fabricate phononic crystals (PnCs) in recent years. Friction Stir Additive Manufacturing (FSAM) is a new-type solid state fabrication technology which is fusion free with low distortions. FSAM was selected to fabricate the designed PnCs. The manufactured specimen was distorted due to the temperature rise in the manufacturing process and the band gaps (BGs) were changed with the distortions. Results indicate that the band gap of the PnCs moves to be in higher frequency domain due to the residual distortions of the manufactured PnCs. The residual distortion of FSAM PnCs is 2.77 times smaller in comparison with the Tungsten Inert Gas (TIG) welding. So, the differences of the band gap between the designed PnCs and the FSAM specimen are only in the range of 0.15%- 0.55% due to the lower temperature rise in FSAM. The further analysis shows that the change of the BGs is caused by the growth of the inertia moment for the FSAM PnCs. With the increase of the rotating speed in FSAM, the residual distortion of the FSAM PnCs is increased due to the increase of the welding temperature. This can lead to the increase of the inertia moment, which is the key reason for the increase of the BG characteristics of the FSAM PnCs.

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Sonic and Photonic Crystals

Abstract: Sonic/phononic crystals named acoustic/sonic band gap media are the elastic analogues of photonic crystals and have received renewed attention recently in many acoustic applications [...]

Cited by 2 publications

References 20 publications

Low‐Frequency Vibration and Noise Reduction and Wave Propagation Properties of Hexagonal Hybrid Metamaterials with Local Resonance Strips

Low‐Frequency Vibration and Noise Reduction and Wave Propagation Properties of Hexagonal Hybrid Metamaterials with Local Resonance Strips

Band gap characteristics of friction stir additive manufactured phononic crystals

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