Results 1 to 10 of about 60,695 (122)
Microwave and Acoustic Absorption Metamaterials [PDF]
Physical Review APPLIED 17, 047001 (2022), 2022 Wave absorption metamaterials have been an enduring topic over the past two decades, propelled not only by novel scientific advances, but also by their extensive application potential. In this review, we aim to provide some general insights into the absorption mechanism common to both microwave and acoustic systems.
Sichao Qu, Ping Sheng
arxiv +4 more sources
Sound absorption in Hilbert Fractal and Coiled Acoustic Metamaterials [PDF]
Applied Physics Letters, 2021 We describe here a class of acoustic metamaterials with fractal Hilbert space-filling and coiled geometry with equal tortuosity for noise mitigation. Experiments are performed using a four-microphone impedance tube and benchmarked against non-viscous and viscothermal Finite Element models related to configurations spanning up to five fractal/geometry ...
G. Comandini +4 more
arxiv +6 more sources
Optimal Absorption of Acoustic Waves by a Boundary [PDF]
SIAM Journal on Control and Optimization, 2021 In the aim to find the simplest and most efficient shape of a noise absorbing wall to dissipate the acoustical energy of a sound wave, we consider a frequency model described by the Helmholtz equation with a damping on the boundary. The well-posedness of the model is shown in a class of domains with d-set boundaries (N -- 1 $\le$ d < N).
Magoulès, Frédéric +3 more
openaire +4 more sources
Applied Sciences, 2023 Recently, to simulate sound propagation inside architectural spaces at high frequencies, the application of computationally expensive wave-based numerical methods to room acoustics simulation is increasing gradually.
Takeshi Okuzono
doaj +1 more source
Absorption characteristics of large acoustic metasurfaces
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2022 Metasurfaces formed of arrays of subwavelength resonators are often tuned to ‘critically couple’ with incident radiation, so that at resonance dissipative and radiative damping are balanced and absorption is maximized. Such design criteria are typically derived assuming an infinite metasurface, whereas the absorption characteristics of ...
O. Schnitzer, R. Brandão
openaire +5 more sources
An Archaeoacoustics Analysis of Cistercian Architecture: The Case of the Beaulieu Abbey
Acoustics, 2021 The Cistercian order is of acoustic interest because previous research has hypothesized that Cistercian architectural structures were designed for longer reverberation times in order to reinforce Gregorian chants.
Sebastian Duran +2 more
doaj +1 more source
Experimental Validation of the Model of Reverberation Time Prediction in a Room
Buildings, 2022 It is well known that the uncertainty of input data has a great influence on the accuracy of room acoustics simulations. The aforementioned accuracy is significantly influenced by the selection of the acoustic properties of room-delimiting materials ...
Artur Nowoświat, Marcelina Olechowska
doaj +1 more source
An archaeoacoustic study on shape: the case study of the Iffland Theatre’s history (1802–1817)
Acta Acustica, 2023 Previous studies have discussed six pre-Sabine quantifiable guidelines employed in room acoustic design: voice directivity, audience rake, “echo theory”, stage acoustics, reverberation, and length, width, and height ratios.
Postma Barteld N.J., Katz Brian F.G.
doaj +1 more source
Photoacoustic Imaging in Biomedicine and Life Sciences
Life, 2022 Photo-acoustic imaging, also known as opto-acoustic imaging, has become a widely popular modality for biomedical applications. This hybrid technique possesses the advantages of high optical contrast and high ultrasonic resolution.
Alexey Neprokin +4 more
doaj +1 more source
Acoustic coherent perfect absorption based on a PT symmetric coupled Mie resonator system
APL Materials, 2023 Parity-time (PT) symmetric coupled resonator systems have exhibited intriguing and unexpected properties in optics and electronics. Here, we extend it to acoustics and report a coupled Mie resonators (MRs) system respecting PT symmetry.
Fangfang Ju +4 more
doaj +1 more source