Results
repositories = "HAL - Hyper Article on Line"
> : "[SPI:ACOU] Engineering Sciences/Acoustics"
(x)
Ambiances sonores en gare : de la mesure acoustique à la mesure immergée
Author(s) :
Rémy, Nicolas
Description :
Comment caractériser les ambiances sonores observables dans un même site ? Comment différencier différents états sensibles d'un même lieu ? Comment l'interaction entre l'espace construit, l'environnement sonore et les pratiques ordinaires s'incarne-t-elle à différents moments de la journée ? Comment...
Repository :
HAL - Hyper Article on Line
Language(s) :
French
Quel rôle les mesures physiques peuvent-elles jouer dans la compréhension des ambiances architecturales et urbaines ?
Author(s) :
Delétré, Jean-Jacques
Description :
La question posée ici se situe bien en aval des réflexions menées actuellement au sein de l'équipe CRESSON, car si on effectue des mesures, c'est qu'on a repéré (ou qu'on suppose qu'il existe) une ou des ambiances remarquables. La mesure vient alors en renfort d'une constatation (ou d'une intuition)...
Repository :
HAL - Hyper Article on Line
Language(s) :
French
Acoustic Wave Approach for Multi-Touch Tactile Sensing
Description :
In this communication, we present a high resolution tactile plate that can localize one or two contact fingers. The localization principle is based on Lamb wave absorption. Fingers' contact will generate absorption signals while Lamb waves are propagating in a thin finite copper plate. These signals...
Repository :
HAL - Hyper Article on Line
Language(s) :
English
Time-domain simulations of sound propagation in a stratified atmosphere over an impedance ground
Description :
Finite-difference time-domain simulations of broadband sound propagation in a stratified atmosphere are presented. A method recently proposed to obtain an impedance time-domain boundary condition is implemented in a linearized Euler equations solver, which enables to study long range sound propagati...
Repository :
HAL - Hyper Article on Line
Language(s) :
English
YAST Algorithm for Minor Subspace Tracking
Description :
This paper introduces a new algorithm for tracking the minor subspace of the correlation matrix associated with time series. This algorithm is shown to have a better convergence rate than existing methods. Moreover, it guarantees the orthonormality of the subspace weighting matrix at each iteration,...
Repository :
HAL - Hyper Article on Line
Language(s) :
English
HRHATRAC Algorithm for Spectral Line Tracking of Musical Signals
Description :
HRHATRAC combines the last improvements regarding the fast subspace tracking algorithms with a gradient update for adapting the signal poles estimates. It leads to a line spectral tracker which is able to robustly estimate the frequencies, even in a noisy context, when the lines are close to each ot...
Repository :
HAL - Hyper Article on Line
Language(s) :
English
Microstructure, transport, and acoustic properties of open-cell foam samples: Experiments and three-dimensional numerical simulations
Author(s) :
Perrot, C.
,
Chevillotte, F.
,
Hoang, M. T.
,
Bonnet, G.
,
Bécot, F.-X.
,
Gautron, L.
,
Duval, A.
Description :
This article explores the applicability of numerical homogenization techniques for analyzing transport properties in real foam samples, mostly open-cell, to understand long-wavelength acoustics of rigid-frame air-saturated porous media on the basis of microstructural parameters. Experimental charact...
Repository :
HAL - Hyper Article on Line
Language(s) :
English
On the dynamic viscous permeability tensor symmetry
Description :
Based on a direct generalization of a proof given by Torquato for symmetry property in static regime, this express letter clarifies the reasons why the dynamic permeability tensor is symmetric for spatially periodic structures having symmetrical axes which do not coincide with orthogonal pairs being...
Repository :
HAL - Hyper Article on Line
Language(s) :
English
Bottom-up approach for microstructure optimization of sound absorbing materials
Description :
Results from a numerical study examining micro-/macrorelations linking local geometry parameters to sound absorption properties are presented. For a hexagonal structure of solid fibers, the porosity ϕ, the thermal characteristic length Λ′, the static viscous permeability k0, the tortuosity α∞, the v...
Repository :
HAL - Hyper Article on Line
Language(s) :
English
Dynamic viscous permeability of an open-cell aluminum foam: Computations versus experiments
Description :
Is it possible to find a two-dimensional (2D) periodic unit cell representative of the dynamic viscous dissipation properties of a real porous media? This is a challenging question addressed in this paper through a review of tools and methods of experimental and computational micro(poro)mechanics. T...
Repository :
HAL - Hyper Article on Line
Language(s) :
English