A5038527221- Acoustic Wave Phenomena Research
- Aerodynamics and Acoustics in Jet Flows
- Noise Effects and Management
- Metamaterials and Metasurfaces Applications
- Vehicle Noise and Vibration Control
- Underwater Acoustics Research
- Fluid Dynamics and Turbulent Flows
- Wind and Air Flow Studies
- Fluid Dynamics and Vibration Analysis
- Vibration Control and Rheological Fluids
- Aerodynamics and Fluid Dynamics Research
- Speech and Audio Processing
- Aerosol Filtration and Electrostatic Precipitation
- Rhetoric and Communication Studies
- Underwater Vehicles and Communication Systems
- Structural Engineering and Vibration Analysis
- Hearing Loss and Rehabilitation
- Cellular and Composite Structures
- Flow Measurement and Analysis
- Aeroelasticity and Vibration Control
- Seismic Waves and Analysis
- Antenna Design and Analysis
- Cavitation Phenomena in Pumps
- Topology Optimization in Engineering
- Animal Vocal Communication and Behavior
Institute of Acoustics
2024
Chinese Academy of Sciences
2024
Inner Mongolia University
2024
University of Hong Kong
2018-2023
Hong Kong University of Science and Technology
2018-2023
Graduate School USA
1996
This Letter reports an acoustic metasurface for low-frequency sound absorption with a compact size in both vertical and lateral directions, which is constructed by series of Helmholtz resonators spiral extended necks. Analytical, numerical, experimental results show that the thickness 13.5 mm possesses total at 320 Hz under normal incidence. The prototype only about 1/80th operating wavelength (λ). What more, side length basic unit (25 mm) also on deep-subwavelength scale (λ/43). To widen...
The noise attenuation properties of an acoustic liner consisting Helmholtz resonators with extended necks (HRENs) are investigated. An optimal constructed by 16 inhomogeneous HRENs is designed to be effective in sound absorption a prescribed frequency range from 700 1000 Hz. Its quasi-perfect capability (average coefficient above 0.9) validated measurements and simulations. resonance frequencies the individual just located within bandwidth, indicating overlapping phenomenon peaks. In...
In this work, we develop a deep subwavelength metasurface which is capable of reflected wave manipulation arbitrarily. Each unit cell the constructed Helmholtz resonator with an extended neck. The possibility creating phase shift offered by different cells analytically explored based on characteristic mode analysis and demonstrated finite element method. It found that ranging from 0 to 2π in supercell (consists eight inhomogeneous cells) can be engineered tuning length A periodical array...
This study presents a thin absorber for low-frequency noise mitigation based on Helmholtz resonator with an extended neck (HREN). An analytical model is established the transfer matrix method and equivalent medium to predict acoustic characteristics of HREN-based absorber, validated by experiments simulations. The properties HREN are characterized comprehensively, including effects radius length neck. It demonstrated that feature its thickness (around 1/30th wavelength operating frequency),...
Based on multi-layer Helmholtz resonators with extended necks (HREN), a compact sound-absorbing structure is developed for extra-broadband sound absorption. The of HREN single perforation beneficial low-frequency absorption under thin thickness. However, it faces the problem effectively attenuating noise only within narrow frequency bandwidth near resonance frequency. To widen its effective bandwidth, two potential solutions are proposed and evaluated: (1) increasing number, (2) adding extra...
Passive metasurfaces are known for their fixed and usually single-wave manipulation functionality, which limits potential applications diverse scenarios. To expand the functionality of passive metasurfaces, frequency-multiplexed technology has been proposed to encode multiple operation frequencies in a single metasurface function selection switching. Although this extensively utilized electromagnetic waves, there have few studies on designing acoustic-wave manipulation. This work applies...
Considering the extraordinary wavefront modulation properties, acoustic metasurfaces have been extensively utilized to achieve powerful wave-manipulation functionalities. The next-generation are urgently required encode more information capacity and process an increasing number of signal channels in a compact device, which needs degrees freedom for multifunctional modulation. In this study, subwavelength monolayer transmission–reflection-integrated (TRIMs) systemically designed through...
Acoustic liners, consisting of a perforated panel affixed to honeycomb core with rigid back plate, are widely used for noise attenuation purpose. In this study, by exploiting inhomogeneous impedance properties, we report an experimental and numerical study on liner-type acoustic metasurface, which possesses the functionality both reflected wave manipulation sound energy simultaneously. To realize impedance, metasurface constructed varying-depth liners is designed fabricated. The pressure...
Abstract By employing a set of resonators with extended necks, an ultrathin acoustic carpet cloak thickness about 1/30th the operation wavelength is proposed to achieve effective cloaking around bump at 1000 Hz. The composed periodic array supercells. supercell constructed by solid unit and seven inhomogeneous different necks. elements in are capable achieving distinct phase shifts ranging from 0 2 π increment /4. To demonstrate effectiveness cloak, both normal incidence oblique (incident...
Herein, electrospinning and paper folding (i.e., origami) techniques are integrated to fabricate a novel ultralight metamaterial for sound absorption based on Miura‐ori tessellation structure, which exists at an extremely low mass density of only 10.64 mg cm −3 . Sound tests using impedance tube demonstrate significant improvement coefficient the shift first resonance frequency lower band compared with plane membrane. Further, effect performance from three important parameters γ , θ that...