The Influence of Non-Uniform Train Speed Distribution in Curves and Straight Line on Rail Corrugation of Tram Railway Vehicle
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Date
2017-07
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Addis Ababa University
Abstract
The rail corrugation is a frequently occurring railhead wear pattern which is arise mostly in curve
and in tangent(straight) track. Rail corrugation is caused by railway track dynamics and it is a
significant problem in railway engineering, that manifests as periodic wear pattern on the contact
surface of rails and lead to undesirable noise and vibration. This project investigates the effect of
speed in the straight and curved line of tram railway vehicle. The project has been organized and
analyzed by numerical approach and software analyzation. Simulation procedure developed in a
project is used and further analyzed for both curved and straight track and it includes the following
three steps: step one studying literature and finding research gaps, step two Simulation of dynamic
vehicle-track interaction in curves and straight tracks with commercial software MATLAB and
MATLAB /SIMULINK and the rail wheel structural flexibility is accounted for using the finite
element method by ABAQUS , then the result observed in straight line that the traction and
breaking are severe, the straight line will assuming that the wheel is acting like a linearized contact
spring and is exciting the first pinned–pinned rail mode. For speed 20km/h,40km/h and 60km/h
the corrugation growth is 2.5×10−7��, 6×10−9�� and1×10−9�� respectively and this results
concluded at this speed the corrugation growth will decrease because of the friction between wheel
and rail is lower while speed increase ,In the curve In low(inner) rail corrugation growth 30km/h
per pass is about 1.21×10−9���� and in high(outer) rail 1.1×10−9���� this would cause, because
of the traction ratio is greater at the high rail than on the low rail for almost all circumstances.
Because of it, mostly expect that plastic flow would occur more readily on the high rail. but, when
a bogie curves with cant excess, the traction ratio on the low rail wheel increases significantly
because the trailing wheelset moves in towards the low rail, also in the severe traction wheel run
from 0-5rpm suddenly cause material removal and leave deformity on the rail of strain
about2.24×10−2 for time of sever breaking the wheel stopped from 5rpm to 0rpm and start to
skid and result in 3.35×10−2 strain moved. Finally conclude that in both curved and straight line
the speed will one of the parameter will be means of corrugation by affecting wheel rail
interaction.
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Keywords
tram railway car, non-uniform speed, train speed distribution, Tram railway vehicle