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Browsing by Subject "noise reflection"

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    Item type:Article, Access status: Open Access ,
    Analyses of sound isolating attributes for recycling materials
    (Wydawnictwa AGH, 2006) Badida, Miroslav; Zvirinský, Vladimír; Lumnitzer, Ervin
    All acoustical materials and structures perform better at some freguencies than others. For this reason, a frequency analysis of the noise to be controlled is almost always required for reduction occupational or environmental noise. Recycled rubber structures made from road tyre and car seat can absorb noise thanks porous structure. For mapping needed acoustical descriptors we designed apparatus for measuring the acoustical absorption (?n), acoustical reflection (Ro), acoustical transmitted (Rp) and acoustical isolation (Dnf) coefficients for normally incident sound which define acoustical materials at once. Realized prototype of apparatus based on the impedance tube and standard featuring of a sound level meter was registered as Industry Design No 3679 from 9.10.2003 by Bureau of Slovakia Industrial Property. This paper deal of frequencies analysis basic occupational acoustic characteristics of recycled porous rubber structures.