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National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
New Findings in Calculating of the Subgrade Response on High-Speed Lines to Train Passage
 Petýrek, Michal ; Horníček, Leoš
The article presents the possibilities of approaches to the calculation of the subsoil response of a railway line to high-speed train running with a focus on Rayleigh waves. The article describes in more detail the approach to the calculation using the method of thin layers, which seems promising for the calculation of the response of the track with the construction of the track with transverse sleepers. The article is focused on this method with regard to the expected use of the track with sleepers on high-speed lines in the Czech Republic. Furthermore, the article mentions the implementation of nonlinear behaviour of soil under dynamic load during the passage of the train and the issue of calculating the subsoil of the line formed by multiple layers of soil with different parameters.
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A short wave limit of the frequency equation for plane-stress nonaxisymmetric disc motions
 Červ, Jan ; Valeš, František ; Adámek, V.
It is proved that the general frequency equation for plane-stress nonaxisymmetric disc motions tends for the first mode of propagation and for wavelengths very short when compared with the disc radius to the secular equation for Rayleigh waves.
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Numerical solution of a secular equation for rayleigh waves in a thin semi-infinite medium made of a composite material
 Červ, Jan ; Adámek, V. ; Valeš, František ; Parma, Slavomír
The traditional way of deriving the secular equation for Rayleigh waves propagating along the stress-free edge of a thin semi-infinite composite is presented. It means that it is necessary to find a general steady-state solution that vanishes at infinity. The secular equation is then obtained by vanishing of the surface traction at the stress-free edge. For the solution of such secular equation it is necessary to precompute some roots of characteristic quartic equation. The method shown in this paper, based on displacement formulation, leads to the so-called implicit secular equation. The numerical approach to the solution is shown.
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