Article
Acoustics
Biswajit Bharat, Venkata R. Sonti
Summary: Modal interactions are studied in a weakly nonlinear structural-acoustic waveguide with cylindrical geometry. The study explores the relationship between modes and derives the conditions and solutions for resonances and beats. It is found that nonlinear wave propagation differs significantly between a rigid and a flexible waveguide.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Physics, Applied
Michael J. Frazier
Summary: This article proposes a design strategy for acoustic metamaterial lattices which leverages the characteristic multi-stability and kinematic amplification of the internal architecture to realize a re-configurable effective mass distribution, enabling a corresponding frequency band structure of extreme tunability.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Toshihiro Ohtani, Yutaka Ishii, Masaaki Tabuchi, Hiromichi Hongo, Kota Sawada
Summary: We investigated the evolutions of two nonlinear acoustic characterizations, resonant frequency shift and mixed frequency response, with electromagnetic acoustic resonance (EMAR) in austenitic stainless steel during creep life. The relationship between their evolutions and micro-structural changes was clarified. EMAR combined resonant acoustic technique with non-contact electromagnetic acoustic transducer (EMAT). By using bulk-shear-wave EMAT, the measured nonlinear acoustic characterizations showed peaks at 40% and a minimum at 60% of creep life. These phenomena were interpreted in terms of dislocation recovery, recrystallization, re-structuring, and the initiation and growth of creep void, supported by SEM and TEM observations. This noncontact resonance-EMAT measurement can monitor the evolution of bulk-shear-wave nonlinearity during creep life and has potential for damage assessment and creep life prediction in metals.
MATERIALS CHARACTERIZATION
(2023)
Article
Engineering, Mechanical
Cheng Zhao, Kai Zhang, Pengcheng Zhao, Zichen Deng
Summary: This study evaluates the wave propagation characteristics of nonlinear two-dimensional acoustic metamaterials using perturbation method and quantitative analysis. The results show that wave amplitude affects the dispersion relations and group velocity, and dual-wave vector phenomenon is observed.
NONLINEAR DYNAMICS
(2022)
Article
Acoustics
M. Osika, A. Ziaja-Sujdak, R. Radecki, L. Cheng, W. J. Staszewski
Summary: This study focuses on the analytical investigation of nonlinear shear horizontal guided wavefields in plates, examining the impact of nonlinear material parameters, excitation frequency, wave number, and wave amplitude on nonlinear mode generation. The analytical solution is based on the multiple-scale perturbation method and modal decomposition approach, validated using the Local Interaction Simulation Approach.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Physics, Fluids & Plasmas
Lezheng Fang, Michael J. Leamy
Summary: This paper investigates the evanescent waves in one-dimensional nonlinear monatomic chains using a first-order Lindstedt-Poincare method. The study reveals the significant role of nonlinear evanescent waves in nonlinear interface problems and presents a classification for them. The perturbation approach used in the study provides important insights and is verified through numerical simulations.
Article
Energy & Fuels
H. M. D. P. Herath, M. A. Wijewardane, R. A. C. P. Ranasinghe
Summary: In recent years, there has been a growing interest in new power generation technologies and thermal energy recovery due to environmental and economic concerns. Thermo-acoustic generation, specifically traveling wave thermo-acoustic generators, has been identified as a promising technology for low-grade energy recovery and power generation. These generators have shown higher efficiency and simplicity compared to standing-wave thermoacoustic generators, making them a cost-effective and reliable option for energy conversion.
Article
Acoustics
Jiawei Liu, Haibin Yang, Honggang Zhao, Yang Wang, Dianlong Yu, Jihong Wen
Summary: An effective homogenization model is crucial for simplifying acoustic scattering computations of underwater structures. A hybrid method combining Bloch wave analysis and retrieval technique is proposed to characterize the acoustic behavior of filled coatings backed with steel plate under external sound waves. The method's effectiveness is validated through numerical simulations and comparisons with traditional methods. The study investigates the influence of shear-wave effect and coupling effect on the homogenization model, providing a comprehensive understanding of effective acoustic behavior.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2022)
Article
Multidisciplinary Sciences
Curtis Rasmussen, Andrea Alu
Summary: The efficiency and bandwidth of traditional passive acoustic radiators are severely limited, but these constraints can be overcome by loading a piezoelectric transducer with a non-Foster active circuit, resulting in significantly improved radiation bandwidth and efficiency. Experimental results demonstrate a threefold increase in bandwidth, paving the way for non-Foster acoustic radiation technologies.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Physics, Fluids & Plasmas
E. Poli, A. Bottino, O. Maj, F. Palermo, H. Weber
Summary: The dynamics of finite-amplitude, undamped geodesic-acoustic-mode (GAM) packets is well described by a nonlinear Schrodinger equation, and a theoretical approach based on the variational method successfully compares with nonlinear particle-in-cell simulations. The GAM is generated through an appropriate initial perturbation, and the nonlinear modifications of the dispersion properties of the plasma due to the GAM itself are retained.
PHYSICS OF PLASMAS
(2021)
Article
Engineering, Marine
Giovanni Petris, Marta Cianferra, Vincenzo Armenio
Summary: This study proposes a numerical model for simulating the propagation of noise generated by directional sources in ocean waveguides. The numerical method is validated and evaluated using analytical solutions and benchmark cases, and incorporating free surface effects in the implementation improves the results. The study also reveals that the directivity and orientation of the source strongly influence the acoustic response in the near field.
Article
Mathematics, Interdisciplinary Applications
Yao Haiyang, Wang Haiyan, Zhang Zhichen, Xu Yong, Juergen Kurths
Summary: This study formulates a mathematical model to describe the complex variation of underwater propagating acoustic signals, presenting a perturb-coefficient nonlinear propagation equation and analyzing initial and boundary conditions to obtain solutions. The model is proven effective through simulations and suitable for various underwater circumstances.
CHAOS SOLITONS & FRACTALS
(2021)
Article
Mathematics, Applied
Kersten Schmidt, Anastasia Thoens-Zueva
Summary: This paper presents impedance boundary conditions for the viscoacoustic equations, with approximative models that can be discretized by finite element methods without resolving boundary layers. The conditions are stable and asymptotically exact, and the results of numerical experiments illustrate the theoretical foundations.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2022)
Article
Engineering, Mechanical
O. Scussel, M. J. Brennan, F. C. L. Almeida, J. M. Muggleton, E. Rustighi, P. F. Joseph
Summary: An appropriate model of leak noise at source is necessary for analytical and numerical approaches. This paper presents an inverse method to predict leak noise at source based on measurements made either side of the leak. The method estimates frequency response functions of pipe sections around the leak position using measured data.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Shuai Tang, Jin-Lei Wu, Cheng Lu, Xiaosai Wang, Jie Song, Yongyuan Jiang
Summary: We have achieved an analog of the reversed f-STIRAP phenomenon in an acoustic system by designing acoustic metamaterials. The agreement between analytical and simulated results confirms the similarity between the propagation of acoustic waves and the evolution of reversed f-STIRAP in quantum optics. The constructed acoustic metamaterials have optional functions such as beam focusing, beam splitting, or asymmetric transmission with switchable features, depending on the wavelength of the incident acoustic wave.
Article
Physics, Multidisciplinary
Yajuan Qi, Chunyin Qiu, Meng Xiao, Hailong He, Manzhu Ke, Zhengyou Liu
PHYSICAL REVIEW LETTERS
(2020)
Article
Multidisciplinary Sciences
Hailong He, Chunyin Qiu, Xiangxi Cai, Meng Xiao, Manzhu Ke, Fan Zhang, Zhengyou Liu
NATURE COMMUNICATIONS
(2020)
Article
Optics
Xiangxi Cai, Liping Ye, Chunyin Qiu, Meng Xiao, Rui Yu, Manzhu Ke, Zhengyou Liu
LIGHT-SCIENCE & APPLICATIONS
(2020)
Article
Multidisciplinary Sciences
Mudi Wang, Wenyi Zhou, Liya Bi, Chunyin Qiu, Manzhu Ke, Zhengyou Liu
NATURE COMMUNICATIONS
(2020)
Article
Optics
Fengming Liu, Pai Peng, QiuJiao Du, Manzhu Ke
Summary: An effective medium theory is proposed to characterize two-dimensional dielectric photonic crystals exhibiting quadrupole resonances. The introduction of a new local effective parameter allows for predicting the characteristics of double-Dirac-cone PCs and shows good agreement with numerical results. Additionally, the double-Dirac-cone PCs are considered as a generalization of traditional double-zero-index metamaterials after introducing the new effective parameter.
Article
Multidisciplinary Sciences
Liping Ye, Chunyin Qiu, Meng Xiao, Tianzi Li, Juan Du, Manzhu Ke, Zhengyou Liu
Summary: Dislocations in solid-state materials have a significant impact on wave propagation due to their topological properties. However, the experimental evidence supporting this observation has been lacking. In this study, the researchers used a 3D acoustic weak topological insulator with controllable dislocations to provide direct experimental evidence for the existence of one-dimensional topological dislocation modes.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Applied
Yang Wang, Licheng Luo, Manzhu Ke, Zhengyou Liu
Summary: This article reports a simple strategy to create multiple acoustic diffraction-limit-broken spots at different spatial positions in the far-field region for a wide frequency range. This work could pave a way for high-resolution manipulation of tiny particles in biomedical and cell research fields.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Multidisciplinary
Mudi Wang, Shan Liu, Qiyun Ma, Ruo-Yang Zhang, Dongyang Wang, Qinghua Guo, Biao Yang, Manzhu Ke, Zhengyou Liu, C. T. Chan
Summary: In this study, we designed phononic crystals with earring nodal links and experimentally observed two different types of earring nodal links. The experimental evidence supports the unique phenomena of non-Abelian band topology.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Tian Wang, Gui-Bo Wang, Ruo-Jun Zhang, Man-Zhu Ke
Summary: In this paper, an acoustic metamaterial consisting of an air bubble in a water-filled metal shell is designed for low frequency underwater sound absorption. Numerical simulation shows that the metamaterial achieves quasi-perfect sound absorption at a specific frequency, and the working frequency can be extended by using a composite structure.
Article
Multidisciplinary Sciences
Mudi Wang, Qiyun Ma, Shan Liu, Ruo-Yang Zhang, Lei Zhang, Manzhu Ke, Zhengyou Liu, C. T. Chan
Summary: Bulk and edge modes in topological materials are closely related, and chiral anomaly bulk states can be achieved by applying boundary conditions to a topologically trivial crystal. The most important property of topological materials is the robust transport of topological edge modes, which depends on bulk topological invariants.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Applied
Shan Liu, Weiyin Deng, Xueqin Huang, Jiuyang Lu, Manzhu Ke, Zhengyou Liu
Summary: Topological insulators, with their robust transports of topological boundary states, have been widely studied in recent years. In this research, we focus on acoustic topological insulators with pseudospin and realize topological heterostructures hosting adjustable capacity helical waveguide modes. These modes are found to be robust against disorders and structural defects, and can be used for partitioning and beam collimation. These results open up new possibilities for exploring topological transports in acoustic wave heterostructures.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Applied
Shunda Yin, Liping Ye, Hailong He, Manzhu Ke, Zhengyou Liu
Summary: The study focuses on the transport behaviors of topological guiding modes for classical waves in heterostructures with width degree of freedom. The researchers have successfully implemented topological waveguides in heterostructures of a square lattice, which can enhance energy transport capacity and flexibility in interfacing with existing devices. This development is significant as previous topological waveguides were only realized in hexagonal lattices.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Multidisciplinary
Zhenhang Pu, Hailong He, Licheng Luo, Qiyun Ma, Liping Ye, Manzhu Ke, Zhengyou Liu
Summary: Higher-order topological phases, characterized by topological boundary states with dimensions two or more less than the system bulk, have attracted widespread interest in various gapped and gapless phases. In this Letter, we report the first prediction and observation of a new type of hinge states, called bound hinge states in the continuum (BHICs), in a higher-order Weyl semimetal implemented in a phononic crystal. Unlike the hinge states in gaps, BHICs are identified by nontrivial surface polarization. This finding broadens our understanding of topological states and may inspire further research in other systems.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Sheng Zhang, Yang Wang, Manzhu Ke, Fengming Liu, Hailong He, Liping Ye, Zhengyou Liu
Summary: Metafluids, a version of metamaterials with fluid background, have been found to accommodate a third parameter, the effective shearlike modulus. The experimental implementation of this novel metafluid, capable of supporting surface waves, updates the existing knowledge of surface waves.
Article
Optics
Luo Licheng, Li Hengyi, Ke Manzhu, Liu Zhengyou
Summary: Acoustic communication is widely used underwater due to low loss, but it lacks the physical properties of spin and polarization like electromagnetic waves. However, utilizing orbital angular momentum as a new degree of freedom independent from time and frequency provides a new option for acoustic communication. This study investigates the manipulation of phase and topological order of acoustic Bessel beams using an artificial structure plate with hollow Archimedes spiral grids, potentially enabling the transfer of more information at the same frequency.
ACTA PHOTONICA SINICA
(2022)
