Investigation of Noise Generated by Railway Freight Wagon Bogie Type Y25Ls(s)e-K and Proposals of Noise Reduction
There have been numerous attempts and investigations carried out with the objective to reduce the noise generated by railway freight wagons because noise is one of ever-present negative environmental pollution phenomena. This resulted in strong legislation requirements on noise reduction in railway...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-02-01
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| Series: | Vehicles |
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| Online Access: | https://www.mdpi.com/2624-8921/4/1/8 |
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| author | Ján Ďungel Peter Zvolenský Juraj Grenčík Ján Krivda |
| author_facet | Ján Ďungel Peter Zvolenský Juraj Grenčík Ján Krivda |
| author_sort | Ján Ďungel |
| collection | DOAJ |
| description | There have been numerous attempts and investigations carried out with the objective to reduce the noise generated by railway freight wagons because noise is one of ever-present negative environmental pollution phenomena. This resulted in strong legislation requirements on noise reduction in railway transport, in the case of freight wagons, only exterior noise is a problem. However, the extremely hard metal structures of the wagons running on hard rails naturally generate high magnitudes of acoustic energy. One big initiative, especially in Germany, seeks a solution in replacement of the cast iron brake pads with the composite one which should result in so-called “silent trains”. But braking is used only during a minor part of the train run, leaving most of the acoustic phenomena of the train run unaffected. In our research, we focused on freight bogies type Y25Ls(s)e-K that are used, including in Slovakia. We simulated the structural natural frequencies to predict vibrations and consequent sound generated by these vibrations. The idea was to localize the vibrations and propose possibilities of noise attenuation. The more realistic view about sound fields was obtained by practical measurements on a moving bogie. Measurements on the test track at a maintenance workshop were done by using a digital acoustic camera Soundcam. For attenuation of noise radiated by the bogie frame, acoustic silencers made from recycled porous fiber material have been applied to the bogie frame. To determine the acoustic difference, the material was applied only on half of the bogie, and then the measurements were carried out. The results showed a promising improvement in reduced noise radiation, which gives support for further research in this area with more precise simulations and more precise coating of the bogie frame as well as the proposal and measurement of noise-attenuating coatings of other structural parts of the freight wagons. |
| first_indexed | 2024-03-09T12:18:27Z |
| format | Article |
| id | doaj.art-fee5df34150247fe91de0e874df5a398 |
| institution | Directory Open Access Journal |
| issn | 2624-8921 |
| language | English |
| last_indexed | 2024-03-09T12:18:27Z |
| publishDate | 2022-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Vehicles |
| spelling | doaj.art-fee5df34150247fe91de0e874df5a3982023-11-30T22:43:57ZengMDPI AGVehicles2624-89212022-02-014112413610.3390/vehicles4010008Investigation of Noise Generated by Railway Freight Wagon Bogie Type Y25Ls(s)e-K and Proposals of Noise ReductionJán Ďungel0Peter Zvolenský1Juraj Grenčík2Ján Krivda3Department of Engineering Services, CEIT, a.s., Univerzitná 8661/6A, 010 08 Žilina, SlovakiaDepartment of Transport and Handling Machines, University of Žilina, 010 26 Žilina, SlovakiaDepartment of Transport and Handling Machines, University of Žilina, 010 26 Žilina, SlovakiaDepartment of Srategic Development, RETEX, a.s., U nádraží 894, 672 01 Moravský Krumlov, Czech RepublicThere have been numerous attempts and investigations carried out with the objective to reduce the noise generated by railway freight wagons because noise is one of ever-present negative environmental pollution phenomena. This resulted in strong legislation requirements on noise reduction in railway transport, in the case of freight wagons, only exterior noise is a problem. However, the extremely hard metal structures of the wagons running on hard rails naturally generate high magnitudes of acoustic energy. One big initiative, especially in Germany, seeks a solution in replacement of the cast iron brake pads with the composite one which should result in so-called “silent trains”. But braking is used only during a minor part of the train run, leaving most of the acoustic phenomena of the train run unaffected. In our research, we focused on freight bogies type Y25Ls(s)e-K that are used, including in Slovakia. We simulated the structural natural frequencies to predict vibrations and consequent sound generated by these vibrations. The idea was to localize the vibrations and propose possibilities of noise attenuation. The more realistic view about sound fields was obtained by practical measurements on a moving bogie. Measurements on the test track at a maintenance workshop were done by using a digital acoustic camera Soundcam. For attenuation of noise radiated by the bogie frame, acoustic silencers made from recycled porous fiber material have been applied to the bogie frame. To determine the acoustic difference, the material was applied only on half of the bogie, and then the measurements were carried out. The results showed a promising improvement in reduced noise radiation, which gives support for further research in this area with more precise simulations and more precise coating of the bogie frame as well as the proposal and measurement of noise-attenuating coatings of other structural parts of the freight wagons.https://www.mdpi.com/2624-8921/4/1/8freight wagonnoise simulationnoise measurementsnoise localization |
| spellingShingle | Ján Ďungel Peter Zvolenský Juraj Grenčík Ján Krivda Investigation of Noise Generated by Railway Freight Wagon Bogie Type Y25Ls(s)e-K and Proposals of Noise Reduction Vehicles freight wagon noise simulation noise measurements noise localization |
| title | Investigation of Noise Generated by Railway Freight Wagon Bogie Type Y25Ls(s)e-K and Proposals of Noise Reduction |
| title_full | Investigation of Noise Generated by Railway Freight Wagon Bogie Type Y25Ls(s)e-K and Proposals of Noise Reduction |
| title_fullStr | Investigation of Noise Generated by Railway Freight Wagon Bogie Type Y25Ls(s)e-K and Proposals of Noise Reduction |
| title_full_unstemmed | Investigation of Noise Generated by Railway Freight Wagon Bogie Type Y25Ls(s)e-K and Proposals of Noise Reduction |
| title_short | Investigation of Noise Generated by Railway Freight Wagon Bogie Type Y25Ls(s)e-K and Proposals of Noise Reduction |
| title_sort | investigation of noise generated by railway freight wagon bogie type y25ls s e k and proposals of noise reduction |
| topic | freight wagon noise simulation noise measurements noise localization |
| url | https://www.mdpi.com/2624-8921/4/1/8 |
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