Open AccessTHICKNESS INFLUENCE ON ABSORBING PROPERTIES OF STRATIFIED COMPOSITE MATERIALS
Author(s) -
Iuliana Iaşnicu,
Ovidiu Vasile,
Radu Iatan
Publication year - 2015
Publication title -
journal of engineering studies and research
Language(s) - English
Resource type - Journals
eISSN - 2344-4932
pISSN - 2068-7559
DOI - 10.29081/jesr.v21i4.130
Subject(s) - anechoic chamber , materials science , cube (algebra) , composite number , composite material , noise reduction coefficient , acoustics , metre , absorption (acoustics) , noise (video) , polyethylene , attenuation coefficient , optics , computer science , porosity , physics , mathematics , image (mathematics) , combinatorics , astronomy , artificial intelligence
Plates known as sound absorbing materials: textiles recovered fabrics plus polyethylene are made layered composite material intended to be used to encapsulate industrial engines, as sources of noise in the production departments. Influence of thickness sound-absorbing material can be supported by the values obtained for the absorption coefficient, but it can be studied as a study case in the anechoic chamber, where the sound pressure level is measured with a sound level meter. Cases captured: a free engine; the engine placed in a metallic cube and motor inserted; metal cube that was doubled separately with one material and then with the composite material proposed. For each situation are eight determinations on the perimeter of a circle with a radius of one meter from the source of the noise. Plot a graph of experimental results that support the idea: greater thickness of the layer of material will cause a better absorption of noise.