Abstract
The paper presents results of a grant research project dealing with acoustic properties of the walls and floor of a railway passenger coach investigated by means of the experimental analysis of noise produced during train runs and corresponding simulations. In the research, conditions and theoretical approaches for possible reconstructions of walls and floor of the railway passenger coach using new fibrous-microstructure acoustic materials were defined, with the aim of increasing the sound reduction index. The properties of the proposed materials were compared in terms of the acoustic energy transfer through the porous microstructure calculated by means of simulations. The final acoustic effects of different solutions for the incorporation of the materials in the floor structure and in the complete body of the rail passenger coach were evaluated. In this paper the effects on interior noise of the introduction of a new material for floor and wall are presented.
Highlights
In recent years, the environmental aspects of design, operation and maintenance of means of transport have been gaining a high importance on a global scale
The results show that the best combinations of material characteristics are on intersection between absorption coefficient and sound reduction index
In the search for suitable technical solutions and methods for noise reduction, it is important to recognise that the suitability of sound absorption materials, or sound reduction materials, depends on the acoustics situation
Summary
The environmental aspects of design, operation and maintenance of means of transport have been gaining a high importance on a global scale. [3]) is focused on technical solutions in the design of railway vehicles (e.g. quieter bogies with new materials, bogie fairings/covers etc.), railway track measures/structures (e.g. rail absorbers, noise barriers, natural walls) and technological aspects of railway operations (e.g. wheel and rail maintenance to reduce roughness). They all can effectively reduce the noise emitted by operation of rolling stock. Main influence of parameters on the noise emitted by railbound vehicles (EN ISO 3381: 2011) [11]
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