New approach to analysis of railway track dynamics – rail head vibrations
Authors:
- Włodzimierz Czyczuła,
- Dorota Błaszkiewicz-Juszczęć,
- Małgorzata Urbanek
Abstract
The article presents an original approach to the analysis of railway track dynamics. The "beam-insidebeam" concept is introduced as a dynamic generalisation of the static head-on-web effect, based on the two-layer model of rail. Rail head is a distinguished element of the rail. The system of distributed moving loads excites rail head as a beam supported by the rail web being considered as a viscoelastic layer. Rail head vibration is a kinematic excitation of the whole rail profile, including the rail head. The whole rail is also considered as a beam on viscoelastic foundation with parameters used in typical analyses of railway track dynamics. Vibrations of the whole rail obtained from the analysis of the two-layer "beam-inside-beam" model are compared with vibrations of typical one-layer track model. It is known that the static head-on-web effect is very limited. The range of significant rail head displacements covers nearly 0.6 m of area centred around the wheel position. This observation is also valid in the case of moving constant load. In other words, the dynamic effect of rail head vibrations in the case without imperfections type of track-vehicle is practically the same as in the static head-on-web case. Nevertheless, the analysis of track imperfections impact with various factors influencing the system behaviour, like the axles load and configuration, the track elastic parameters, the length of imperfection, or the train speed, show that the head-on-web effect is significant and should be analysed in more detail. For this purpose, a new model “beam-inside-beam” is proposed. The Fourier series are used to solve the two considered models. The load and unknown functions in the models’ solutions are expanded in the arbitrarily assumed interval which practically covers non-zero track response for the analysed system of parameters (group of wheels). This solving method for equation of motion was experimentally validated in the paper by Czyczula et al. (2017). Validation of the "beam-inside-beam" model is considered as future work and the current article should be recognised as a preliminary study of the analysed effects under assumption of being purely theoretical investigation so far, although forming hierarchically organised building of more complex rail models is possible to partially verify in further steps of modelling process.
- Record ID
- CUT112094a906dd4bb581ee4e0398a27e4b
- Publication categories
- ;
- Author
- Journal series
- Open Engineering, ISSN 2391-5439
- Issue year
- 2021
- Vol
- 11
- No
- 1
- Pages
- 1233-1243
- Other elements of collation
- rys.; tab.; wykr.; Bibliografia (na s.) - 1242-1243; Bibliografia (liczba pozycji) - 24; Oznaczenie streszczenia - Abstr.; Numeracja w czasopiśmie - Vol. 11, Iss. 1
- Keywords in English
- railway track, moving load, train axles configuration, track imperfections
- DOI
- DOI:10.1515/eng-2021-0119 Opening in a new tab
- URL
- https://www.degruyter.com/document/doi/10.1515/eng-2021-0119/html Opening in a new tab
- Language
- eng (en) English
- License
- Score (nominal)
- 70
- Publication indicators
- = 0
- Uniform Resource Identifier
- https://cris.pk.edu.pl/info/article/CUT112094a906dd4bb581ee4e0398a27e4b/
- URN
urn:pkr-prod:CUT112094a906dd4bb581ee4e0398a27e4b
* presented citation count is obtained through Internet information analysis, and it is close to the number calculated by the Publish or PerishOpening in a new tab system.