Article
Nanoscience & Nanotechnology
Fei Wu, Zegang Ju, Ziteng Geng, Jiang Zhao, Man Hu, Guilin She, Huayan Pu, Jun Luo, Ping Xiang
Summary: This paper presents a new type of acoustic meta-liner structure that achieves perfect impedance matching and efficient sound energy dissipation in a broadband range. Experimental and numerical results demonstrate over 90% sound absorption in various conditions.
Article
Physics, Applied
Jiang Zhao, Fei Wu, Ze-Gang Ju, Man Hu, Xiao Zhang, Dan Li, Shan-Lin Yan, Ke-Ling Liu
Summary: A novel neck-embedded meta-liner is proposed for broadband sound absorption under grazing flow, with a wide speed range. The meta-liner exhibits excellent sound attenuation capacity and has potential applications in noise reduction engineering.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Acoustics
Ning Xiang, Cameron J. Fackler, Yiqiao Hou, Andrew A. J. Schmitt
Summary: This paper explores the design of multilayer MPP absorbers using a Bayesian inferential framework, incorporating model selection and parameter estimation. The design process involves determining the required number of MPP layers and their corresponding parameters in order to meet design targets. The Bayesian design formulation and experimental validation offer insights into achieving effective multilayered MPP absorbers.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2022)
Article
Acoustics
Teresa Bravo, Cedric Maury
Summary: This work focuses on the acoustical performance limitations of cylindrical silencers made up of annular ring resonators with axial gradient of their cavity depths. It is shown that a sub-wavelength silencer with optimized acoustic black hole (ABH) properties can be designed through which incident sound waves are retarded and fully dissipated within the activated resonant cavities. Key parameters that influence this balance are the axial growth of cavity depths and the wall porosity. A causal-based criterion has been proposed to maximize the total integrated dissipated power and determine the optimal porosity and bandwidth-to-length ratio.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Multidisciplinary Sciences
Shuping Wang, Jiancheng Tao, Xiaojun Qiu, Ian S. Burnett
Summary: This study found that staggered windows outperform traditional single-glazed windows in noise reduction at mid to high frequencies while allowing for natural ventilation. To achieve noise attenuation in the low frequency range, a novel coiled-up silencer design with coupled tubes is proposed, showing improved noise reduction capability across a wider spectrum.
SCIENTIFIC REPORTS
(2021)
Article
Acoustics
Charlie Bricault, Yang Meng, Sebastien Goude
Summary: In this work, a general design strategy for passive acoustic treatments dealing with low frequency, broadband noise is proposed. The design involves the use of arrays of Helmholtz resonators along the walls of a rectangular waveguide. An analytical model based on the transfer matrix method is used to relate the resonator parameters and acoustic response of the system. Optimization is carried out to find the optimal structural design that minimizes the transmission coefficient in the desired frequency range. Two specific designs are provided and their acoustic performances are validated through simulations and measurements. The proposed design method can be easily applied to waveguides with different cross-sectional shapes and has broad applications in engineering projects involving noise reduction in HVAC systems.
Article
Engineering, Mechanical
Xinyue Wu, Zhihui Wen, Yabin Jin, Timon Rabczuk, Xiaoying Zhuang, Bahram Djafari-Rouhani
Summary: A new seismic metamaterial is proposed, which broadens the wave attenuation frequency range and shifts it towards lower frequencies through a combination of pillars and core-shell structures. Analysis of the symmetry of the excited Rayleigh wave and the eigenmodes in the dispersion curves shows that the frequency range of efficient wave attenuation in transmission is much wider than that of the corresponding bandgap.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Acoustics
Lei Xiang, Gongxian Wang, Chao Zhu, Mengfei Shi, Jingzheng Hu, Gang Luo
Summary: A ventilated acoustic barrier with a binary structure is proposed in this study to efficiently silence low-frequency sound while maintaining fluid free-flow. The experimental results confirm the feasibility of this design, which is consistent with theoretical predictions.
Article
Engineering, Mechanical
Jingwen Guo, Renhao Qu, Yi Fang, Wei Yi, Xin Zhang
Summary: A phase-gradient acoustic metasurface is designed for broadband noise reduction in a flow duct. By manipulating the wavefront, the metasurface achieves a linear phase shift of reflected wave, leading to enhanced sound absorption performance. The metasurface's attenuation characteristics in the presence of flow are investigated experimentally and numerically, showing potential for broadband noise attenuation.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Aerospace
Xianghai Qiu, Xiaodong Jing, Lin Du, Jing Yang, Xiaofeng Sun, Xiaowei Zhang
Summary: This paper studies the nonlinear effect of wire mesh liners under high sound pressure level (SPL) and establishes a more accurate impedance model based on jet simulation and experimental results, addressing the limitations of existing models.
Article
Acoustics
Mingyang Zheng, Chao Chen, Xiaodong Li
Summary: Restricted by resonance principle, Helmholtz resonators can only effectively absorb noise near the resonance frequency. Coupling multiple resonators is an effective way to broaden the absorption band. In this study, numerical simulations and experiments are conducted to investigate the influence of grazing flow and sound incident direction on the acoustic performance. The results show that grazing flow weakens noise suppression ability and alters the acoustic characteristics of the system, while changing the sound incidence direction can mitigate the negative impact.
Article
Physics, Applied
Zhenfang Zhang, Dianlong Yu, Yong Xiao, Bing Hu, Yu Bai, Jihong Wen
Summary: In this paper, a compact acoustic meta-silencer (AMS) that combines reactive and resistive units is proposed to control low-frequency and broadband noise in ducts. The AMS consists of two independent annular chambers representing reactive and resistive units, and achieves superior sound attenuation through a synergistic mechanism. Numerical and experimental analysis demonstrates that the optimized AMS with a compact size can achieve a transmission loss higher than 15 dB over a super-wide low-frequency range (290-1344 Hz).
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
John Marc C. Puguan, Arni Gesselle M. Pornea, James Laurence A. Ruello, Hern Kim
Summary: A flexible nanofibrous aerogel with laser-cut perforations was developed for effective sound absorption and insulation. By turning PET waste bottles into nanofibers, a 3D porous network was created, allowing for noise reduction and increased transmission loss. The addition of perforations further enhanced the material's sound absorption.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Han Yu, Chao Tan, Feng Dong
Summary: The study introduces a new broadband ultrasound method that utilizes fractal approach to address the influence of particle aggregation on acoustic attenuation, enhancing the accuracy of the attenuation model. By modifying the ultrasound attenuation model and formulating the inversion of particle size characterization as an optimization problem, the iterative optimization method successfully solves the inverse problem.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Engineering, Civil
Qihang Liu, Chuanzeng Zhang
Summary: This paper proposes a novel slit-perforated multi-layered porous metamaterial (SMPM) with broadband and low-frequency sound absorption characteristic. The SMPM consists of periodic porous matrix layers and slits-containing second-type porous layers. The theoretical model based on double porosity (DP) theory and homogenization method is validated by numerical results obtained from finite element software. The introduction of periodic slits enhances sound absorption in SMPM, especially at low frequencies, and the porous matrix layers and second-type porous layers play different roles in sound energy dissipation.
ENGINEERING STRUCTURES
(2023)
Article
Acoustics
Tianyu Gu, Zhihui Wen, Liangshu He, Minle Yu, Yong Li, Yan Li, Yabin Jin
Summary: We study a lightweight metastructure that can simultaneously reduce vibration and noise in a broad low-frequency range through theoretical, numerical, and experimental methods. By introducing spiral slits and micro-perforations in the panel and core plate, respectively, we achieve broadband low-frequency sound absorption and vibration isolation. This multifunctional metastructure provides a new route to design lightweight load-bearing structures with noise and vibration reduction performance for potential applications in aerospace engineering and transportation vehicles.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Acoustics
Botao Liu, Sibo Huang, Bo Zheng, Xuefeng Chen, Jia Zhao, Xinrui Qi, Yong Li, Shengchun Liu
Summary: This study proposes an underwater sound-absorbing composite lattice with low-frequency and ultra-broadband characteristics. The lattice cells convert incident longitudinal waves into transverse waves through multiple local resonance coupling and multiple scattering. The proposed composite lattice provides a practical approach to designing ultrathin low-frequency and ultra-broadband acoustic absorption coating for underwater noise suppression.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Acoustics
Xiao Pan, Longsheng Zeng, Yong Li, Xuefeng Zhu, Yabin Jin
Summary: This study numerically and experimentally analyzes FZP lenses around 5 MHz and achieves stable subwavelength underwater sound focusing. The relationship between focal spot size and the ratio of focal length to lens diameter, as well as the relationship between focal length and working frequency, is explored.
Article
Physics, Applied
Yihuan Zhu, Ruizhi Dong, Dongxing Mao, Xu Wang, Yong Li
Summary: Nonlocal metasurfaces, harnessing nonlocality, have demonstrated unmatched abilities in wave-front manipulation efficiency. In this study, we show that nonlocality can serve as a powerful tool to achieve significant enhancement in working bandwidth, demonstrated by an acoustic open metasurface that allows airflow while blocking sound transmission.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Applied
Xinsheng Fang, Nengyin Wang, Wenwei Wu, Weibo Wang, Xuewen Yin, Xu Wang, Yong Li
Summary: Metagratings, which are characterized by scattering matrices, show promise for efficient and anomalous wave-diffraction control. In this study, we focus on the degenerated states of scattering matrices induced by non-Hermiticity, which encode unique scattering behaviors. We investigate the exotic degeneracies, exceptional points (EPs), and diabolic points (DPs) in these scattering systems both theoretically and experimentally. We demonstrate the distinct response strength induced by EP and DP, with extremely asymmetrical reflection occurring on the EP state in a metagrating, offering opportunities for microvariable detection and external perturbation monitoring. In contrast, a stable dual-angle absorber is proposed on the DP state, which is almost unaffected by external perturbations. Our work may pave the way for extreme wave manipulation via non-Hermitian metagratings on degenerated states.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Applied
Bin Jia, Lujun Huang, Artem S. Pilipchuk, Sibo Huang, Chen Shen, Almas F. Sadreev, Yong Li, Andrey E. Miroshnichenko
Summary: In this study, we demonstrate the existence of symmetry-protected BICs in an open acoustic resonator with reduced symmetry by attaching two cylindrical waveguides. We experimentally verify the presence of these BICs and show that they can be converted into accidental BICs by tuning the angle between the waveguides.
PHYSICAL REVIEW APPLIED
(2023)
Article
Engineering, Manufacturing
Nengyin Wang, Chengcheng Zhou, Sheng Qiu, Sibo Huang, Bin Jia, Shanshan Liu, Junmei Cao, Zhiling Zhou, Hua Ding, Jie Zhu, Yong Li
Summary: In this study, a meta-silencer with intensive mode density is proposed to effectively suppress resonance dispersion and achieve designable timbre. The design enables high-efficiency sound attenuation in a broadband frequency range, with controllable sound attenuation and designable timbre characteristics. This research opens a new pathway for timbre manipulation using passive resonances-controlled acoustic metamaterials, inspiring the development of innovative multifunctional devices in noise-control engineering, impedance engineering, and architectural acoustics.
INTERNATIONAL JOURNAL OF EXTREME MANUFACTURING
(2023)
Article
Computer Science, Interdisciplinary Applications
Tengjiao He, Shiqi Mo, Erzheng Fang, Xinyu Liu, Yong Li
Summary: This paper presents ESM-FLOW, a meshless, wave-based method for modeling sound propagation in 3D axisymmetric lined ducts. ESM-FLOW combines the numerical efficiency and accuracy of typical BIF methods while overcoming the limitations imposed by uniform media. It is highly applicable to the acoustic design of engines and ventilation systems.
ENGINEERING WITH COMPUTERS
(2023)
Review
Physics, Multidisciplinary
Xu Wang, Ruizhi Dong, Yong Li, Yun Jing
Summary: Acoustic metasurfaces, with their advanced capabilities of wave manipulation at a small size, are at the forefront of acoustic material research. However, conventional metasurfaces are limited by their underlying physics and design principles. Recent research has shown that harnessing non-locality and losses can enhance the functionality of acoustic metasurfaces, leading to a new design paradigm. This review summarizes the progress of non-local and non-Hermitian acoustic metasurfaces, discusses their critical role, and explores their potential and challenges.
REPORTS ON PROGRESS IN PHYSICS
(2023)
Article
Physics, Multidisciplinary
Haiyan Zhang, Shanshan Liu, Zhiwei Guo, Shengyu Hu, Yuguang Chen, Yunhui Li, Yong Li, Hong Chen
Summary: In this work, we propose theoretically and demonstrate experimentally unidirectional perfect absorption in a non-Hermitian acoustic system with the help of the topological bound state in the continuum (BIC). The system exhibits extreme asymmetry, with acoustic perfect absorption at the left incidence and near-total reflection at the right incidence. This study bridges the gap between scattering characteristics of non-Hermitian acoustic systems and topological scattering singularities, contributing to the research of novel non-Hermitian physics and practical applications of advanced absorbers and sensors.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2023)
Article
Optics
Tao He, Zhanyi Zhang, Jingyuan Zhu, Yuzhi Shi, Zhipeng Li, Heng Wei, Zeyong Wei, Yong Li, Zhanshan Wang, Cheng-Wei Qiu, Xinbin Cheng
Summary: This paper reports a universal paradigm for achieving high-efficiency exceptional points (EPs) in the visible range by leveraging interlayer loss to control the interplay between a lossy structure and scattering lightwaves. A bilayer framework is demonstrated to efficiently reflect and absorb incident light, opening up possibilities for nanoscale devices and EP physics.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Physics, Applied
Sibo Huang, Yong Li, Jie Zhu, Din Ping Tsai
Summary: This article provides an overview of recent progress in and future prospects for sound-absorbing materials (SAMs), including single resonant SAMs and coupled resonant systems, as well as the emergence of sound-absorbing metamaterials. The conservation equations and design strategies for achieving tunable and broadband SAMs are discussed, along with recent developments in multifunctional SAMs and metaliners. The article concludes with an outlook on potential directions and applications for future work in this field.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Applied
Shanshan Liu, Sibo Huang, Zhiling Zhou, Pei Qian, Bin Jia, Hua Ding, Nengyin Wang, Yong Li, Jie Chen
Summary: We report the theoretical and experimental observation of a Friedrich-Wintgen BIC with bridging near-field coupling in an asymmetric two-state acoustic system. By tuning the diameter and position of the bridging tube, we can effectively modulate the near-field coupling effect of the presented system and achieve a Friedrich-Wintgen BIC, as well as a quasi-BIC-based high Q-factor perfect absorption.
PHYSICAL REVIEW APPLIED
(2023)
Article
Engineering, Mechanical
Xinsheng Fang, Xuewen Yin, Jian Wu, Yongsheng Li, Hongyun Li, Weibo Wang, Yong Li, Wenwei Wu
Summary: In this study, a metagrating is constructed with a single layer viscoelastic medium, periodic cylindrical cavities, and a steel plate, and demonstrated as a tunable quasi-perfect absorber in low frequency. By utilizing effective medium approximation and genetic algorithm optimization, tunable absorbers with deep subwavelength thicknesses can be achieved. Broadband absorption underwater is further improved by using multi-layer metagratings and converting longitudinal waves efficiently into shear waves through local resonance coupling and multiple scattering effects. The adoption of a metagrating comprising multi-layer voids with random periods enables precise modulation of surface impedance in the target spectrum, leading to quasi-perfect absorption performance in broadband. These findings will contribute to the design of lightweight underwater absorbers to enhance the stealth performance of vehicles.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Review
Physics, Applied
Lujun Huang, Sibo Huang, Chen Shen, Simon Yves, Artem S. Pilipchuk, Xiang Ni, Seunghwi Kim, Yan Kei Chiang, David A. Powell, Jie Zhu, Ya Cheng, Yong Li, Almas F. Sadreev, Andrea Alu, Andrey E. Miroshnichenko
Summary: Acoustic resonances in open systems, characterized by complex eigenfrequencies, play a fundamental role in manipulating acoustic wave radiation and propagation. Recent advances in non-Hermitian open systems have led to exciting applications in sound manipulation and acoustic wave-based devices.
NATURE REVIEWS PHYSICS
(2023)