Vorträge und Posterpräsentationen (mit Tagungsband-Eintrag):
M. Ostermann, T. Maly, F. Michelberger:
"Ballast flying initiated by ice droppings - problems, measures and a new monitoring approach";
Vortrag: International Conference on Traffic and Transport Engineering (ICTTE) 2018,
- 28.09.2018; in: "ICTTE Belgrade 2018 - Proceedings of the Fourth International Conference on Traffic and Transport Engineering",
S. Zezelj (Hrg.);
Under certain conditions in winter snow or ice can adhere on the surface of vehicles. If ice chunks fall from the bottom side of a vehicle while the train is moving fast and if there is a ballasted track, the im-pact can be high enough to strike single stones out of their cohesion structure and the so-called bal-last flying might occur. When disengaged stones gain enough height, collisions with the underside are possible. Thus, such stones may be smashed into the ballast bed and pull out further stones or lead to further detachments. Due to these mechanisms an avalanche effect can appear. Such events are able to cause heavy damage on the vehicle surface and on the infrastructure. Furthermore, people near of the track could also be endangered.
The target of possible measures can be on the one hand to prevent the impact or reduce the impact force of the ice droppings and thus avoid the avalanche effect or on the other hand, to prevent ice or snow adherences on the bottom side of the vehicles in general. In this paper, the state-of-the-art measures for both purposes are described and divided into three categories: measures on the vehicle side, the infrastructure side and the operation side.
In a funded research project, a new approach of a measure to prevent the occurrence of ballast flying was elaborated. The idea is to monitor the bottom side of the train with a wayside monitoring system and to identify critical ice or snow accumulations. One of the key findings is that in principle the detec-tion of dangerous ice accumulations seems to be possible with existing technologies. A comparison between measurement methods and their applicability in a future measurement system shows that a light-section based detection approach seems to be most promising.
ballast flying, track infrastructure, infrastructure application, monitoring system, operation safety
Erstellt aus der Publikationsdatenbank der Technischen Universitšt Wien.