Abstract
The paper deals with the modification of the rail passenger coach floor design aimed at improvement of sound reduction index. Refurbishing was performed by using a new acoustic material with a filamentary microstructure. The materials proposed in research were compared by simulation calculation of acoustic energy transfer trough porous microstructure of filamentary material, and the effect of material porosity on sound reduction index and sound absorption coefficient were observed. This proposed filamentary material can be used in the railway bed structure, too. High degree of noise absorbing, resistance to climate conditions, low specific mass, enable to choose a system of low anti-noise barriers having similar properties as standard high anti-noise walls..
Highlights
The paper deals with simulation calculations of acoustics energy transfer through the structure of porous media
The benefit material composition of sandwich character of structure construction offers a wide range of possibilities application of modern acoustic materials
As a simple and effective solution to improve the acoustic properties of rail passenger coach body it seems to be utilization of the insulation layer from modern acoustics materials
Summary
The paper deals with simulation calculations of acoustics energy transfer through the structure of porous media. The aim of research is improving the sound reduction index of rail passenger coach body or improving acoustics parameters of railway track structure. Mineral wool provides good acoustic and thermal insulation properties. As a simple and effective solution to improve the acoustic properties of rail passenger coach body it seems to be utilization of the insulation layer from modern acoustics materials. One of the proposed solutions can be utilization of STERED® material in the railway track structure and in the structure of a rail passenger coach. From this point of view the paper deals with comparison of acoustic properties of porous materials - mineral wool and STERED® material
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