Results 31 to 40 of about 295,337 (289)

Exploratory Acoustic Investigation of Customizable 3D-Printed Hybrid Acoustic Materials (HAMs) through Interlaboratory Impedance Tube Measurements

Acoustics, 2023
Acoustic materials are widely used for improving interior acoustics based on their sound absorptive or sound diffusive properties. However, common acoustic materials only offer limited options for customizable geometrical features, performance, and ...
Vaia Tsiokou, Louena Shtrepi, Elena Badino, Arianna Astolfi, Anna Karatza   +4 more
doaj   +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

Comparison of Triply Periodic Minimal Surface Energy Absorbers Under Uniaxial Compressive Loading

Advanced Engineering Materials, EarlyView.
This study investigates LCD 3D printed Triply Periodic Minimal Surface (TPMS) structures as mechanical energy absorbers. By comparing various base designs and layered combinations under uniaxial compression, it identifies that a Diamond‐Gyroid sandwich structure offers superior performance.
Sergej Grednev, Noah‐Lean Roschlaub, Anne Jung   +2 more
wiley   +1 more source

Computationally-efficient rendering of diffuse reflections for geometrical acoustics based room simulation

Acta Acustica
Geometrical acoustics is well suited for real-time room acoustics simulation and is often implemented using the image source model (ISM). One drawback of the ISM is its limitation to specular reflections, while sound scattering plays an important role in
Ewert Stephan D., Gößling Nico, Buttler Oliver, van de Par Steven, Hu Hongmei   +4 more
doaj   +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

An Explicit Constitutive Reconstruction Framework for Mechanical Characterization of Miniaturized 3D‐Printed Specimens

Advanced Engineering Materials, EarlyView.
An explicit constitutive reconstruction framework enables accurate tensile characterization of miniaturized additively manufactured specimens using only the grip‐to‐grip displacement measurements. Progressive validation through self‐consistency, analytical comparison, and inverse finite element method (iFEM) benchmarking demonstrates constitutive ...
Junqing Leng, Caralyn Collins, Pengpeng Zhang, Joanna Zhang, Cheng Sun   +4 more
wiley   +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

On the Acoustics of St Cecilia's Hall: Measurements and Comparison of Wave-based and Geometrical Acoustics Modelling

, 2019
St Cecilia’s Hall, Scotland’s oldest purpose-built concert hall, has a distinctive elliptical-domed shape that exhibits non-diffuse acoustical characteristics.
D'Orazio, D., M. Newton, B. Hamilton, Newton, M., G. Fratoni, Fratoni, G., D. D'Orazio, Hamilton, B.   +7 more
core   +1 more source

Adaptive Foam 3D Printing of Ultralight and Multifunctional Materials

Advanced Engineering Materials, EarlyView.
Adaptive foam 3D printing, enabled by expandable microspheres, imparts cellular structures to thermoplastic and thermosetting polymers, manufactured through a variety of processes including fused filament fabrication, direct ink writing, digital light processing, and inkjet printing.
Nariman Rajabifar, Amir Ameli
wiley   +1 more source

Reverberation time and audibility in phased geometrical acoustics using plane or spherical wave reflection coefficients [PDF]

, 2019
Room acoustics parameters are typically predicted using some form of geometrical acoustics for large rooms. For smaller rooms, phased geometrical acoustics improves results for lower frequencies.
Boucher, Matthew, Wim Desmet, Lukáš Zelem, Matthew A. Boucher, Monika Rychtarikova, Desmet, Wim, Bert Pluymers, Zelem, Lukas, Rychtarikova, Monika, Pluymers, Bert   +9 more
core   +1 more source