56 Tram and Trolleybus Net Traction Energy.pdf

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Tram and Trolleybus Net Traction Energy
Consumption Comparison
Abstract — The need for energy efficient and environmentally
friendly intracity transportation has now become very critical.
Electric driven mass transportation systems have shown to be one
of the solutions to traffic congestion and its related pollution level
in most of the cities. Additionally, when compared with the
traditional internal combustion engine (ICE), the electric driven
mode of transport is much more efficient especially when
regenerative braking is used. This paper took a step farther and
compared two most common electric public transportation
systems in cities. Traction energy consumption per passenger of a
trolleybus was compared to that of a tram, both using
regenerative braking, travelling from point A to point B,
assuming the same route. For the sake of energy consumption
comparison an 11.95 km route with eight (8) stations from
Ubungo maziwa to Central railway station in Dar es Salaam,
Tanzania was chosen. With their particular specifications such as
effective mass and coefficient of friction, the two vehicles were
modeled and simulated using MATLAB, in such a way their
acceleration, braking deceleration, maximum speed, and
travelling time were all the same. Their speed profiles which were
more or less the same are presented in this paper alongside their
corresponding energy consumption.
Keywords: Tram, Trolleybus, Traction energy consumption per
passenger
978-1-4799-8805-1/15/$31.00 ©2015 IEEE
V
m
M
F
R
F
T
= M a + F
R
; F
T
a
F
T-max
F
T
= F
R
F
R
F
T
= 0
a =
–F
R
/M
F
T
F
grad
a
F
drag
F
R
F
RR
m
a
dt
,
Attribute
,
Value
Tram
Trolleybus
,
Tram
Trolleybus
Total
11.95
11.21
18.37
24.35

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