Open AccessConsiderations on longitudinal dynamics of passenger trains with blocked wheelsets during braking
Author(s) -
Cătălin Cruceanu,
Camil Ion Crăciun
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/564/1/012123
Subject(s) - train , passenger train , dynamic braking , threshold braking , automotive engineering , blocking (statistics) , matlab , computer science , electronic brakeforce distribution , vehicle dynamics , braking distance , set (abstract data type) , simulation , engineering , braking system , brake , computer network , cartography , programming language , geography , operating system
The aim of the study is to highlight the fact that, besides the other well-known aspects, wheelsets blocking during braking actions performed in poor wheel/rail adhesion conditions has important influence on the longitudinal dynamics of the train. The study is based on MATLAB numerical simulations, performed for passenger trains consisting of four vehicles. There were considered the possible operational situations specific in low adhesion condition braking, determined by the pitch effect, i.e. the possible blocking of one up to all wheelsets of the vehicle. The results presented in the paper cover two situations: train set composed of identical vehicles, considering only the braking forces and, respective, classical configuration train hauled by a locomotive with a larger weight compared to each coach, resistances being also taken into account in simulations in that case. The outcomes indicate important dynamic effects in the train body, highlighting the importance of using performant wheel slide protection devices, essential not only for traffic safety reasons, but also useful in terms of in-train level of forces. It is to mention that these results represent the initial step of a more comprehensive ongoing study.