Article
Optics
Ahmed Mehaney, Ashour M. Ahmed, Francis Segovia-Chaves, Hussein A. Elsayed
Summary: The research investigates the effect of applied hydrostatic pressure on one-dimensional quasi-periodic phononic crystals based on the Fibonacci sequence. It is found that the band gap width increases in quasi-crystals compared to periodic designs, with resonant peaks appearing in their transmission spectra. As pressure increases, the band gap and resonant modes shift towards higher frequencies while the band gap widths decrease in quasi-crystals.
Article
Acoustics
Xiao-Shuang Li, Xiao-Lei Tang, Xiao-Xing Su, Chuanzeng Zhang, Yue-Sheng Wang
Summary: In this study, three-dimensional phononic crystal-based coupled resonator waveguides (PnCCRWs) are proposed for guiding acoustic waves along complex routes. The interaction between the PnC point defects is described by the tight-binding model, enabling the propagation of acoustic wave energy along designated paths.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Physics, Applied
Xiao-Lei Tang, Tian-Xue Ma, Yue-Sheng Wang
Summary: In this work, the topological rainbow trapping and energy amplification of acoustic waves in a gradient phononic crystal structure is investigated numerically and experimentally. Topological interface states (TISs) are generated along the interface between two phononic crystals with different topological phases due to the acoustic valley Hall effect. Rainbow trapping is achieved by introducing gradient into a 3D-printed phononic crystal structure by varying the geometrical parameter of scatterers along the interface. Incident acoustic waves at different frequencies split, stop, and are significantly amplified at different positions. Importantly, the rainbow trapping of TISs is immune to random structural disorders. The topological rainbow trapping shows promise for the design of broadband energy harvesters with excellent robustness.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Mechanical
Yue Bao, Zhengcheng Yao, Yue Zhang, Xueman Hu, Xiandong Liu, Yingchun Shan, Tian He
Summary: This paper proposes a novel triple-gradient phononic acoustic black hole (ABH) beam that strategically manipulates multiple gradients to enhance its performance. The study reveals that the ABH effect is not solely brought about by the thickness gradient, but also extends to the power-law gradients in density and modulus. The synergistic development of three different gradient effects leads to more pronounced and broader bandgaps in PCs.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Physics, Applied
S. M. Kuznetsova, J-P Groby, L. M. Garcia-Raffi, V Romero-Garcia
Summary: We report the localization of an acoustic wave at the interface between two one-dimensional hyperuniform materials of different geometrical representations, which suppress acoustic scattering in the long wavelength regime and possess a wide band gap. These materials are made of an air-filled acoustic waveguide with rigid diaphragms acting as scatterers, offering promising applications in wave control devices with wide band gap and emergence of edge modes.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Crystallography
Xinsa Zhao, Guodong Hao, Yu Shang, Jianning Han
Summary: Conventional acoustic systems have difficulty in sensing weak acoustic fault signals in complex mechanical vibration environments. To address this issue, a three-dimensional device, coupling gradient acoustic metamaterials (GAM) with phononic crystals (GAM-PC), is proposed in this paper. The strong wave compression effect coupled with the phononic crystal equivalent medium mechanism is utilized to enhance the perception of weak acoustic signals at the target frequency. Numerical simulations and experiments verify the superior amplification capability of the GAM-PC structure for loud signal amplitudes. Additionally, the GAM-PC structure has a narrower bandwidth per slit, making it more frequency selective, and it can separate different frequency components. This work is expected to be applied in signal monitoring in environments with strong noise.
Article
Nanoscience & Nanotechnology
Samuli Heiskanen, Tuomas A. Puurtinen, Ilari J. Maasilta
Summary: Controlling thermal transport at the nanoscale is crucial for various applications. This study demonstrates that thermal conductance can be controlled using three-dimensional phononic crystals, without the need for suspension. Experimental results show that at sub-Kelvin temperatures, these structures can enhance thermal conductivity.
Article
Chemistry, Physical
Mikhail Marunin, Nataliya Polikarpova
Summary: This paper presents a study of the propagation of elastic waves in two-dimensional phononic crystals based on fused silica. The band structures and acoustic characteristics of the phononic crystals are analyzed, and it is shown that the choice of the crystal's geometry can control the distribution of inverse phase velocities and energy walk-off angles. Three mutually orthogonal acoustic modes are observed in the phononic crystal, regardless of the direction of the acoustic wave's propagation.
Article
Physics, Applied
Haofeng Liang, Xiao Liang, Jiaming Chu, Zhuo Zhou
Summary: This paper designs a phononic crystal with acoustic black hole (ABH) characteristics and discusses the mechanism of bandgap expansion and the factors influencing ABH. The results show that the phononic crystal with ABH has improved bandgap width and limits compared to the one without ABH.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Review
Materials Science, Multidisciplinary
Christabel Choi, Shubhi Bansal, Niko Munzenrieder, Sriram Subramanian
Summary: Acoustic metamaterials and phononic crystals have the potential to revolutionize human interactions and sensory communications. Understanding the fundamental theory and design principles alone is not enough; physical realization of these structures through fabrication and assembly is equally important. The paper critically examines fabrication and assembly approaches, addressing crucial parameters for efficient structural implementation. Various assembly techniques are proposed, uncovering innovative designs and supporting a fresh paradigm for innovation.
ADVANCED ENGINEERING MATERIALS
(2021)
Article
Crystallography
Jianning Han, Guodong Hao, Wenying Yang, Xinsa Zhao
Summary: In the field of industrial structure detection, acoustic signals play a pivotal role. This study proposes a structure (PC-Mie) that couples phononic crystal (PC) point defects and Mie resonance structures (Mies) to enhance weak effective signals from complex environments. Numerical and experimental studies demonstrate that the PC-Mie can effectively enhance the energy of specific sound frequencies in complex air environments, making it suitable for collecting high-sensitivity acoustic signals. This research has significant implications for the development of weak acoustic signal detection technology and the application of self-powered sensors.
Article
Engineering, Mechanical
Xi Zhang, Xiaodong Huang, Guoxing Lu
Summary: In this study, a novel perforated Miura-ori phononic structure (PMPS) is introduced, and the tunability of complete or partial bandgaps in specific directions is investigated. The validity of the bandgaps is verified through simulation and experimental measurement of sound transmission loss in a three-dimensional printed Miura-ori panel. The results demonstrate extensive bandgap tunability of PMPS with different design parameters during deployments and folds. Additionally, potential applications of PMPS, such as programmable acoustic waveguides, are demonstrated. Lightweight PMPSs offer an attractive alternative for designing tunable, programmable, and reconfigurable acoustic structures, including sound waveguides, sound barriers, and broadband wave tailors.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Physics, Applied
Oluwaseyi Muhammad, Oluwaseyi Ogun, John Kennedy
Summary: This study developed a deep learning based autoencoder to inversely design topological phononic beams. By studying the topologically protected interface state, the characteristics of the interface modes were determined. The network prediction was validated by finite element numerical simulations and experimental tests.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Acoustics
Hao Gao, Yegao Qu, Guang Meng
Summary: Phononic crystals are engineered structures with unique acoustic properties that cannot be found in natural materials. These crystals exhibit band gaps where wave propagation is prohibited due to their periodic structure. This article presents a method using a generalized plane wave expansion and voxel-based discretization to calculate the band structures of three-dimensional phononic crystals. The proposed method, integrated with an adaptive genetic algorithm, is used for topological optimization of constituent distribution to maximize the width of the band gap. Numerical results validate the effectiveness of the method for optimizing a cubic phononic crystal, and the eigenmodes of the optimized crystal are investigated to better understand the mechanism of band gap broadening.
JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME
(2023)
Review
Instruments & Instrumentation
Guobiao Hu, Lihua Tang, Junrui Liang, Chunbo Lan, Raj Das
Summary: Metamaterials and phononic crystals with artificially designed periodic microstructures have unique properties and applications in energy harvesting. The integration design strategy and manipulation of refractive index profile can enhance energy harvesting efficiency.
SMART MATERIALS AND STRUCTURES
(2021)
