The Analysis of Factors That Influence the Sound Absorption Coefficient of Porous Materials
Journal Title: Romanian Journal of Acoustics and Vibration - Year 2014, Vol 11, Issue 2
Abstract
In this paper are presented researches on the identification of factors that influence the sound absorption coefficient of porous materials used for absorption of the sound wave. To achieve these researches were used three materials (glass wool, flexible polyurethane foam and rigid polyurethane foam) for which it was determined the sound absorption coefficient using the impedance tube and was analyzed the influence of thickness, density and structure of these materials on the sound absorption coefficient.
Authors and Affiliations
Ancuta TIUC, Ovidiu VASILE, Anamaria USCA, Timea GABOR, Horatiu VERMESAN
Random vibrations of Duffing oscillator with nonlinear elastic characteristic of exponential type
We present a method for estimating the power spectral density of the stationary response of Duffing oscillator with nonlinear elastic force of exponential type. The method is based on the idea that a nonlinear system may...
Application for Automated Recognition of Damage Locations
This paper present an application developed in Visual Basic, able to precisely indicate a damage location for known beam characteristics (in terms of geometry and mechanical properties) and the natural frequencies of s...
Finite Elements Simulations of Noise Damping in a Muffler
This study represents an investigation of the COMSOL Finite Elements (FE) capabilities of simulating noise reduction techniques. This general purpose FE code has an acoustics module, from which the present study investig...
Finite Element Method based Algorithm for Localization of Damages in Cantilever Beams
This paper presents the researches made by the authors in order to develop an algorithm and method to localize damages in beams using vibration measurement. The chosen type of beam was the cantilever one, for which a dat...
An Assessment Model of Urban Noise Performed Through SIMITR Subsystem
Modelling the sound pressure levels of traffic noise at any location in an urban area requires a series of steps in order to collect, collat and report data, in accordance with the European Community legislation (Directi...