Results 11 to 20 of about 3,581 (229)
Double-negative acoustic metamaterial [PDF]
Physical Review E, 2004 We show here the existence of acoustic metamaterial, in which both the effective density and bulk modulus are simultaneously negative, in the true and strict sense of an effective medium. Our double-negative acoustic system is an acoustic analogue of Veselago's medium in electromagnetism, and shares many unique consequences, such as negative refractive
Li, Jensen Tsan Hang, Chan, Che Ting
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Time-domain imaging of gigahertz surface waves on an acoustic metamaterial [PDF]
New Journal of Physics, 2018 We extend time-domain imaging in acoustic metamaterials to gigahertz frequencies. Using a sample consisting of a regular array of ∼1 μ m diameter silica microspheres forming a two-dimensional triangular lattice on a substrate, we implement an ultrafast ...
Paul H Otsuka +9 more
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Miniaturized Spiral Metamaterial Array for a Ventilated Broadband Acoustic Absorber [PDF]
Shock and Vibration, 2020 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.
Xingxing Liu, Xiang Li, Zhiying Ren
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Sound reduction by metamaterial-based acoustic enclosure [PDF]
AIP Advances, 2014 In many practical systems, acoustic radiation control on noise sources contained within a finite volume by an acoustic enclosure is of great importance, but difficult to be accomplished at low frequencies due to the enhanced acoustic-structure ...
Shanshan Yao +3 more
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Study on acoustic performance of new spiral sound absorbing and insulating metamaterial [PDF]
Journal of Low Frequency Noise, Vibration and Active ControlMiddle and low frequency band sound waves have strong penetration and diffraction abilities during the propagation process, making it difficult to attenuate.
Song Liu +6 more
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Effective Negative Mass Nonlinear Acoustic Metamaterial with Pure Cubic Oscillator [PDF]
Advances in Civil Engineering, 2018 Acoustic metamaterial, which can prohibit effectively the elastic wave propagation in the bandgap frequency range, has broad application prospects in the vibration and noise reduction areas.
Ming Gao, Zhiqiang Wu, Zhijie Wen
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Acoustic Metamaterials in Aeronautics [PDF]
Applied Sciences, 2018 Metamaterials, man-made composites scaled smaller than the wavelength, have demonstrated a huge potential in their applications in acoustics, opening up for sub--wavelength acoustic absorbers, acoustic invisibility, perfect acoustic mirrors and acoustic lenses for hyper focusing, acoustic illusions and enabling new degrees of freedom in the control of ...
Palma, Giorgio +4 more
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Research on the Sound Insulation Properties of Membrane-type Acoustic Metamaterials [PDF]
E3S Web of Conferences, 2021 Low- and medium-frequency noise from ship cabins is difficult to control effectively. Excessive noise can seriously affect the acoustic stealth performance of ships.
Hao Jinyu +4 more
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Acoustic metamaterial absorbers: The path to commercialization [PDF]
, 2023 Acoustic metamaterial represents the synergism between wave physics and designed geometric structures, aimed at novel acoustic properties. For the important functionality of acoustic absorption, metamaterials face the challenges posed by a mature ...
Sheng, Ping +3 more
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A transformable anisotropic 3D penta-mode metamaterial
Materials & Design, 2023 Penta-mode metamaterials, composed by solids but behaving as liquid, have great potential in manipulating acoustic wave in fluids. Most work concentrates on 2D penta-mode metamaterial consisting of classic honeycomb lattice and their acoustic ...
Zhibo Wei +4 more
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