Broadband acoustic subwavelength imaging by rapidly modulated stratified media
Sign Up to like & getrecommendations! Published in 2018 at "Scientific Reports"
DOI: 10.1038/s41598-018-23411-5
Abstract: An acoustic anisotropic lens (AAL) based on large mass-density modulation depth (LMMD) medium is proposed for subwavelength imaging. The underlying mechanism for converting evanescent components into propagating waves is attributed to the strong suppression of… read more here.
Keywords: proposed lens; imaging rapidly; broadband acoustic; acoustic subwavelength ... See more keywords
Ultra-transparent media with anisotropic mass density for broadband acoustic invisibility
Sign Up to like & getrecommendations! Published in 2017 at "Applied Physics Letters"
DOI: 10.1063/1.5002741
Abstract: This paper demonstrates the design of ultra-transparent anisotropic media for broadband acoustic invisibility. The required parameter distributions of the proposed invisibility cloak are derived by coordinate transformation, and its practical implementation simply consists of two-dimensional… read more here.
Keywords: ultra transparent; broadband acoustic; acoustic invisibility; media anisotropic ... See more keywords
Broadband acoustic energy harvesting metasurface with coupled Helmholtz resonators
Sign Up to like & getrecommendations! Published in 2018 at "Applied Physics Letters"
DOI: 10.1063/1.5041731
Abstract: We report a broadband acoustic energy harvesting metasurface consisting of periodic arrangements of coupled Helmholtz resonators. Theoretical analysis and numerical and experimental results show that a high output voltage can be obtained at a wide… read more here.
Keywords: energy harvesting; acoustic energy; broadband acoustic; harvesting metasurface ... See more keywords
Broadband acoustic converging and asymmetric converging based on thermoacoustic phased arrays
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Applied Physics"
DOI: 10.1063/1.5055288
Abstract: We report broadband acoustic converging and asymmetric converging based on mono- and dual-layer thermoacoustic phased arrays of Bessel-like beams, respectively. Based on the thermoacoustic units, we design a converging lens constructed by a monolayer phased… read more here.
Keywords: converging region; broadband acoustic; phased arrays; asymmetric converging ... See more keywords
Broadband acoustic focusing by symmetric Airy beams with phased arrays comprised of different numbers of cavity structures
Sign Up to like & getrecommendations! Published in 2017 at "Chinese Physics B"
DOI: 10.1088/1674-1056/26/11/114304
Abstract: We realize broadband acoustic focusing effect by employing two symmetric Airy beams generated from phased arrays, in which the units of the phased arrays consist of different numbers of cavity structures, each of which is… read more here.
Keywords: broadband acoustic; phased arrays; symmetric airy; cavity ... See more keywords
Topology-Optimized Omnidirectional Broadband Acoustic Ventilation Barrier
Sign Up to like & getrecommendations! Published in 2020 at "Physical review applied"
DOI: 10.1103/physrevapplied.14.054016
Abstract: As a problem in acoustics, sound insulation finds wide applications in diverse situations. We design and experimentally implement an omnidirectional broadband acoustic ventilation barrier using a topology-optimization method. We propose a broadband acoustic barrier constructed… read more here.
Keywords: barrier; broadband acoustic; ventilation; topology ... See more keywords
Broadband Acoustic Impedance Building via the Fusion of Sparsely Promoted Reflectivity and Background Acoustic Impedance
Sign Up to like & getrecommendations! Published in 2023 at "IEEE Transactions on Geoscience and Remote Sensing"
DOI: 10.1109/tgrs.2023.3245083
Abstract: Geophysical exploration is developing from qualitative seismic imaging to quantitative imaging, and broadband acoustic impedance is the core. Directly estimating broadband impedance using full-waveform inversion is a strong nonlinear problem. It is difficult to obtain… read more here.
Keywords: background; acoustic impedance; broadband acoustic; reflectivity ... See more keywords
Broadband acoustic wave propagation in three-dimensional shallow waveguide with variable sound speed profile and boundary roughness
Sign Up to like & getrecommendations! Published in 2017 at "Journal of the Acoustical Society of America"
DOI: 10.1121/1.4987664
Abstract: Propagation of broadband acoustic signals in shallow water environment is a complex four-dimensional problem that needs to be addressed with input from the spatial and temporal physical parameters of waveguides with rough boundaries. To construct… read more here.
Keywords: three dimensional; propagation; acoustic wave; broadband acoustic ... See more keywords
Effects of azimuthal dependent sediment layer structure on broadband acoustic propagation during Seabed Characterization Experiment in 2017
Sign Up to like & getrecommendations! Published in 2018 at "Journal of the Acoustical Society of America"
DOI: 10.1121/1.5035881
Abstract: Seabed physical properties profoundly affect acoustic energy upon interaction. The inherent structural composition of the sediment column interacting with acoustic waves has been a topic of research for decades. Besides the intrinsic physical properties that… read more here.
Keywords: characterization experiment; broadband acoustic; seabed characterization; physical properties ... See more keywords
Miniaturized Spiral Metamaterial Array for a Ventilated Broadband Acoustic Absorber
Sign Up to like & getrecommendations! Published in 2020 at "Shock and Vibration"
DOI: 10.1155/2020/8887571
Abstract: The high-efficiency and broadband acoustic reduction performance in a miniaturized free-flow structure remains challenging in acoustic engineering applications due to the contradiction of ventilation and acoustic reduction performance. Traditional acoustic absorbers can sufficiently attenuate acoustic… read more here.
Keywords: broadband acoustic; ventilated broadband; reduction performance; performance ... See more keywords
An introduction to NASA’s broadband acoustic absorbers that resemble natural reeds
Sign Up to like & getrecommendations! Published in 2021 at "International Journal of Aeroacoustics"
DOI: 10.1177/1475472x211033492
Abstract: Thin, lightweight, and durable broadband acoustic absorbers capable of absorbing sounds over a wide frequency range, especially below 1000 Hz, while also surviving harsh operational conditions such as exposure to sprays of liquid and solid debris… read more here.
Keywords: introduction nasa; broadband acoustic; acoustic absorption; geometry ... See more keywords