Parcourir par tags

Tous les tags » Matériaux acoustiques » Exposition des travailleurs au bruit (RSS)
Performance d’outils de modélisation pour la résolution de deux problématiques de bruit et de vibrations de type impulsionnel
Dans divers secteurs d'activité professionnelle comme les mines, la construction, la transformation de métaux, la forêt, l'agriculture, l'aéronautique, la police, etc., le bruit et les vibrations sont souvent de nature impulsionnelle, c'est-à-dire que les nuisances se traduisent généralement par des niveaux très élevés pendant une courte durée, et elles sont alors potentiellement très dangereuses pour les travailleurs exposés. Une stratégie efficace de lutte contre ces agents nocifs...
Panels Manufactured from Vegetable Fibers: An Alternative Approach for Controlling Noises in Indoor Environments
Noise control devices such as panels and barriers, when of high efficiency, generally are of difficult acquisition due to high costs turning in many cases their use impracticable, mainly for limited budget small-sized companies. There is a huge requirement for new acoustic materials that have satisfactory performance, not only under acoustic aspect but also other relevant ones and are of low cost. Vegetable fibers are an alternative solution when used as panels since they promise satisfactory acoustic absorption, according to previous researches, exist in abundance, and derive from renewable sources...
Reducing of the sound pressure level in industrial areas by screening noise sources
This paper presents several ways in which the propagation of acoustic waves produced by an industrial noise source can be attenuated by identifying the optimal location of an acoustic screen near the noise source. Six types of acoustic screens were used, made of six types of materials (of the category used in the field of construction), with or without sound absorbing qualities. The noise source was placed in four different positions in front of the acoustic screen. The microphone was placed in 16 recording positions, at four distances and four heights. The experimentally obtained values indicate...
Classrooms with shorter reverberation times lead to a much better signal-to-noise ratio while requiring less vocal effort from teachers
The study presented here is the most extensive, systematic study to examine the impact of reducing reverberation in a working school environment. By installing varying acoustic treatments in three similar classrooms it has been possible to investigate the true effects of different acoustics in occupied schoolrooms. The three classrooms, plus an untreated room, were compared both objectively through acoustic measurements and subjectively through surveying the opinions of pupils, teachers and other adults. The results demonstrate conclusively the benefits to all of improving the acoustic environment...
Le local a un rôle déterminant dans l'exposition au bruit des travailleurs
Par la réverbération, le local augmente le bruit provenant des machines et affecte tout l'espace de travail. Le code du travail français fixe les caractéristiques minimales que doivent présenter les locaux. Ce document de l'INRS rappelle quelques aspects techniques, décrit comment qualifier un local, précise les exigences réglementaires et explique le principe et la mise en œuvre du traitement acoustique d'un local. Ce document annule et remplace la fiche pratique de sécurité ED 136 "Améliorer l'acoustique...

Abonnement courriel

Messages récents

Catégories

Mots-Clés (Tags)

Blogoliste

Archives