Localization of Increased Noise at Operating Speed of a Passenger Wagon

Ján Ďungel, Peter Zvolenský, Juraj Grenčík, Lukáš Leštinský and Ján Krivda
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Ján Ďungel: Department of Engineering Services, CEIT, a.s., Univerzitná 8661/6A, 010 08 Žilina, Slovakia
Peter Zvolenský: Department of Transport and Handling Machines, University of Žilina, 010 26 Žilina, Slovakia
Juraj Grenčík: Department of Transport and Handling Machines, University of Žilina, 010 26 Žilina, Slovakia
Lukáš Leštinský: Department of Transport and Handling Machines, University of Žilina, 010 26 Žilina, Slovakia
Ján Krivda: Department of Srategic Development, RETEX, a.s., Unádraží 894, 672 01 Moravský Krumlov, Czech Republic

Sustainability, 2021, vol. 13, issue 2, 1-16

Abstract: Noise generated by railway wagons in operation is produced by large numbers of noise sources. Although the railway transport is considered to be environmental friendly, especially in production of CO 2 emissions, noise is one of problems that should be solved to keep the railway transport competitive and sustainable in future. In the EU, there is a strong permanent legislation pressure on interior and exterior noise reduction in railway transport. In the last years in Slovakia, besides modernization of existing passenger wagons fleet as a cheaper option of transport quality improvement, quite a number of coaches have been newly manufactured, too. The new design is usually aimed at increased speed, higher travel comfort, in which reduction of noise levels is expected. However, not always the new designs meet all expectations. Noise generation and propagation is a complex system and should be treated such from the beginning. There are possibilities to simulate the structural natural frequencies to predict vibrations and sound generated by these vibrations. However, the real picture about sound fields can be obtained only by practical measurements. Simulations of the wagon’s natural frequencies and mode shapes and measurements in real operation using a digital acoustic camera Soundcam have been done, which showed that for the calculated speeds the largest share of noise from the chassis was not radiated through the floor of the wagon, as was expected, but through the ceiling of the wagon. To improve the acoustic properties of the wagon at higher speed, it was proposed to use high-volume textile insulation in the ceiling of the wagon. The paper briefly presents modern research approaches in the search for ways to reduce internal noise in selected wagons used in normal operation on the Slovak railways.

Keywords: noise; passenger wagon; noise simulation; noise measurements; noise localization (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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