Results 31 to 40 of about 2,694 (304)

Panel of resonators with variable resonance frequency for noise control [PDF]

, 2012
The article focuses on acoustic resonators made of perforated sheets bonded onto honeycomb cavities. This kind of resonators can be used in adverse conditions such as high temperature, dirt and mechanical constraints. For all these reasons, they are, for
Pommier-Budinger, V., Pommier-Budinger, Valérie, Valerie Pommier-Budinger, Olivier Cherrier, Cherrier, Olivier, Simon, Frank, Simon, F., Frank Simon   +7 more
core   +1 more source

Constrained least-squares and maximum-likelihood calibration of absorption coefficients in reverberation time equations

Acta Acustica
Calibration of material properties in room acoustics simulations is essential to producing realistic results. However, the number of available algorithms for calibrating room acoustics models remain limited. This work presents two methods for calibrating
Bellows Samuel D., Katz Brian F. G.
doaj   +1 more source

Project ancient acoustics part 3 of 4 : Influence of geometrical and material assumptions on ray-based acoustic simulations of two ancient theatres [PDF]

, 2016
Acoustic models of ancient theatres found in literature are often based on assumptions, both for geometrical and material properties. The influences of these assumptions on modelling results have been assessed in this paper, which is part of the Ancient ...
Wenmaekers, R.H.C., Wilt, MC van der, Diakoumis, A., Loenen, RC van, van der Wilt, M.C., Wenmaekers, RHC Remy, van Loenen, R.C., Hak, C.C.J.M., Hak, CCJM Constant, Diakoumis, A Adonia   +9 more
core  

Geometric acoustics and coherence propagation [PDF]

The Journal of the Acoustical Society of America, 1982
The mutual coherence function of a deterministic acoustic field obeying a parabolic equation will be expressed in terms of Fourier representations of the Green functions for the field. In the short wave limit, these representations allow for a uniform treatment of the field near various real space caustics by circumventing apparent singularities.
David H. Berman, John J. McCoy
openaire   +1 more source

Prediction of jet mixing noise with Lighthill's Acoustic Analogy and geometrical acoustics [PDF]

The Journal of the Acoustical Society of America, 2017
A computational aeroacoustics prediction tool based on the application of Lighthill's theory is presented to compute noise from subsonic turbulent jets. The sources of sound are modeled by expressing Lighthill's source term as two-point correlations of the velocity fluctuations and the sound refraction effects are taken into account by a ray tracing ...
Ilário, Carlos R.S., Azarpeyvand, Mahdi, Rosa, Victor, Self, Rod, Meneghini, Júlio R.   +4 more
openaire   +4 more sources

Prediction of Surface Topography Parameters in Direct Laser Interference Patterning of Stainless Steel Using Infrared Monitoring and Convolutional Neural Networks

Advanced Engineering Materials, EarlyView.
This study presents an infrared monitoring approach for direct laser interference patterning (DLIP) combined with a convolutional neural network (CNN). Thermal emission data captured during structuring are used to predict surface topography parameters.
Lukas Olawsky, Marcelo Sallese, Leander Kläber, Clemens Kuhn, Keming Du, Andrés Fabián Lasagni   +5 more
wiley   +1 more source

Wave-Based Room Acoustics Modelling: Recent Progress and Future Outlooks [PDF]

, 2018
Room acoustics simulations have conventionally relied on the high-frequency simplifications of geometrical and statistical acoustics. In such models, sound is assumed to propagate along rays and wave diffraction effects largely neglected.
Bilbao, Stefan, Hamilton, Brian
core   +1 more source

Branched flow and caustics in nonlinear waves

New Journal of Physics, 2019
Rogue waves, i.e. high amplitude fluctuations in random wave fields, have been studied in several contexts, ranging from optics via acoustics to the propagation of ocean waves.
Gerrit Green, Ragnar Fleischmann
doaj   +1 more source

A simple, validated approach for design of two-dimensional periodic particle patterns via acoustophoresis

Materials & Design, 2023
Two-dimensional patterning of microparticles enables a wide range of functional materials, including patterned energy storage electrodes, flexible electronics, and sensor arrays.
Keith E. Johnson, Drew S. Melchert, Emilee N. Armstrong, Daniel S. Gianola, Corie L. Cobb, Matthew R. Begley   +5 more
doaj   +1 more source

Air‐Pressure–Actuated Vibroacoustic Metamaterial With Tunable Bandgap: Design, Modeling, and Characterization

Advanced Engineering Materials, EarlyView.
This article presents the design, modeling, and characterization of air‐pressure–actuated programmable vibroacoustic metamaterials (PVAMM). The study focuses on leveraging air pressure to dynamically tune resonance frequencies for effective noise attenuation.
William Kaal, Michael M. Becker, Sarah C. L. Fischer   +2 more
wiley   +1 more source