Digitální knihovnaUPCE
 

The ballast pick-up problem in high speed trains

Konferenční objektOtevřený přístup
Náhled

Datum publikování

2010

Vedoucí práce

Oponent

Název časopisu

Název svazku

Vydavatel

Univerzita Pardubice

Abstrakt

When a high speed train overpasses a critical speed produces a wind speed close to the track large enough to start the motion of the ballast elements, eventually leading to the rolling of the stones and, if they get enough energy, they can jump and then initiate a saltation-like chain reaction. In this contribution a mathematical model of the initiation of the motion is presented. The dynamics of the stone is formulated taking into account both gravity and aerodynamic forces. These aerodynamic forces are the result of the train-generated-gust impinging on the stones. Although they are intrinsically non steady, under some conditions a cuasi-steady aerodynamic model can be employed. Conditions for the start of the motion are obtained in terms of the Tachikawa number (a kind of Froude number). The aerodynamic characteristics are included in terms of the zero aerodynamic moment line of the stone, and the aerodynamic moment coefficient.

Rozsah stran

p. 130-135

ISSN

Trvalý odkaz na tento záznam

Projekt

Zdrojový dokument

Vydavatelská verze

Přístup k e-verzi

open access

Název akce

5th International Scientific Conference "Theoretical and Practical Issues in Transport" (11-12 February 2010, Pardubice, Czech Republic)

ISBN

978-80-7395-245-7

Studijní obor

Studijní program

Signatura tištěné verze

Umístění tištěné verze

Přístup k tištěné verzi

Klíčová slova

high speed trains, ballast, saltation, modelization

Endorsement

Review

item.page.supplemented

item.page.referenced