Manufacturing Technology 2020, 20(3):335-341 | DOI: 10.21062/mft.2020.043

Acoustic Characteristics of Composite Structures Used in Train

Martin Juricka1,2, Ladislav Fojtl1,2, Soňa Rusnáková3, Eva Juřičková4
1 Faculty of Technology, Department of Physics and Material Engineering, Tomas Bata University in Zlin, Náměstí T.G.Masaryka 275, 762 72 Zlin, Czech Republic
2 Centre of Polymer Systems, University Institute, Tomas Bata University in Zlin, tr. Tomase Bati 5678, 760 01 Zlin, Czech Republic
3 Department of Production Engineering, Faculty of Technology, Tomas Bata University in Zlin, nam. T.G. Masaryka 5555, 760 01 Zlin, Czech Republic
4 Department of Industrial Engineering and Information Systems, Faculty of Management and Economics, Tomas Bata University in Zlin, Mostní 5139, 760 01 Zlin

This paper presents a study focused on sandwich structures as well-known train construction materials that are composed of two thin and rigid face sheets and a thick, low-density core material. For trains, the wheel-rail inter-face is the main source of noise, and the wheel-rail roughness, especially in the presence of rail corrugation, is the main excitation source transmitted to the interior and area for passengers. The purpose of the study is to optimize the acoustic properties of a composite sandwich panel used for train floors and walls. Sound absorption coefficient (?), noise reduction coefficient (NRC) and Transmission loss (TL) evaluations have been implemented and experimentally validated on a typical sandwich material used for trains. The opportunity to use a different material can be concretely calculated and modified for critical frequency ranges. Sound transmission loss levels of the structural components as the floor and wall of the train body, which are required of producers and cus-tomers, were tested in acoustic laboratory and acoustic devices according to ASTM and ISO standards. It is demonstrated that, for honeycomb and cork sandwich panels, acoustic response is not sensitive to cell size. For foam core sandwich panels, it is observed that different compositions with thin layers are effective in the fre-quency range of 50 - 1000 Hz.

Keywords: composite structures, sound absorption coefficient, noise, train, wheel rail
Grants and funding:

Operational Program Research and Development for Innovations, co-funded by the European Regional Development Fund (ERDF) and the national budget of the Czech Republic, within the framework of the project Centre of Polymer Systems (reg. number: CZ.1.05/2.1.00/03.0111). The Ministry of Education, Youth and Sports of the Czech Republic – Program NPU I (LO1504).
Specific research, IGA/FT/2016/013, IGA/FT/2017/002 and IGA/FT/2017/011. Ministry of Education, Youth and Sports of the Czech Republic within the NPU I program (Grant no. LO1504) and by the European Regional Development Fund (Grant No. CZ.1.05/2.1.00/19.0409).

Received: May 1, 2020; Revised: July 16, 2020; Accepted: July 20, 2020; Prepublished online: September 3, 2020; Published: September 7, 2020  Show citation

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Juricka M, Fojtl L, Rusnáková S, Juřičková E. Acoustic Characteristics of Composite Structures Used in Train. Manufacturing Technology. 2020;20(3):335-341. doi: 10.21062/mft.2020.043.
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