DEFLECTION PROFILE OF A NEW LIGHT RAIL TRACK SYSTEM.

1996 ◽  
Vol 117 (4) ◽  
pp. 272-277 ◽  
Author(s):  
H AL NAGEIM ◽  
F MOHAMMAD ◽  
L LESLEY ◽  
Keyword(s):  
Light Rail ◽  
Rail Track ◽  
Track System

Non Destructive Testing of Low Profile Light Weight Track System

2010 ◽  
Author(s):  
Hassan Al Nageim
Keyword(s):  
Prestressed Concrete ◽  
Traffic Congestion ◽  
Full Scale ◽  
Scale Model ◽  
Light Rail ◽  
Destructive Testing ◽  
Low Profile ◽  
Track System ◽  
Multilayer Beams ◽  
Non Destructive

The paper presents the results of the responses of a concrete trough of a new lightweight rail track system (LR55) to full scale non destructive tasting. The system which is made from three main components; low profile steel rail, elastomeric pad and prestressed concrete trough is developed for light rail transits in cities streets, which can significantly help in improving the traffic flow, reducing the traffic congestion and thus providing opportunities for minimising serious environmental problems such as level of noise, vibration and air pollutions and in this regards it can be considered as environmentally friendly means of transport. A mathematical model was developed where the LR55 track system was treated as multilayer beams on elastic foundations, and the model was then validate experimentally through a series of non-destructive tests on full scale model subjected to a full scale service load specified by the current BS codes of practises.

scholarly journals 122 Study on wave propagation in rail track system

2005 ◽  
Vol 2005.15 (0) ◽  
pp. 82-85
Author(s):  
Toshiki Kitagawa ◽  
Kaoru Murata ◽  
Kiyoshi Nagakura
Keyword(s):  
Wave Propagation ◽  
Rail Track ◽  
Track System

scholarly journals Seismic response of CRTS II ballastless track-bridge system considering the damage of track structure

2021 ◽  
Vol 104 (3) ◽  
pp. 003685042110352
Author(s):  
Bin Yan ◽  
Zhe Li ◽  
Shi Liu ◽  
Hao-Ran Xie
Keyword(s):  
Seismic Response ◽  
High Speed ◽  
Great Influence ◽  
Sharp Decrease ◽  
Base Plate ◽  
Vertical Displacement ◽  
Longitudinal Force ◽  
Rail Track ◽  
Track System ◽  
Track Bridge

Based on the 16–32 m simply-supported beam bridge on Shanghai-Kunming high-speed railway, a collision model of CRTS II track system was established. The model considered the longitudinal, horizontal as well as vertical nonlinear constraints among structural layers, and the Kelvin element was used to simulate the pounding effect of the gaps. The seismic response of the CRTS II track system was firstly analyzed and then the influences of different cases of damaged track plate, base plate, and mortar layer were discussed. The study revealed that: (1) The rail, track plate, and base plate all bear large longitudinal force and their stress envelope curves are all anti-symmetric. (2) The broken track plates result in a sharp decrease in track plate stress and an extreme increase in rail stress and base plate stress near the gap. The broken base plates result in a sharp decrease in base plate stress and an extreme increase in rail stress and track plate stress near the gap. (3) Both the pounding frequency and pounding force between broken slabs are relatively large and will decrease after some time. (4) The broken slabs near ends of the first bridge span greatly increase the pounding force of stoppers close to the abutment. (5) The gap width has a huge influence on the pounding force and times of stoppers and gaps. (6) The debonding of mortar layer has a great influence on the vertical displacement of rail, track plate, and the base plate.

The Response of a New Lightweight Rail Track System (LR55) to Various Loading Environment

1997 ◽  
Author(s):  
H. Al Nageim ◽  
F. Mohammad ◽  
Lewis Lesley
Keyword(s):  
Finite Element ◽  
Elastic Behaviour ◽  
Two Dimensional ◽  
Element Analysis ◽  
Finite Element Program ◽  
Vertical Pressure ◽  
Rail Track ◽  
Track System ◽  
Dimensional Finite Element ◽  
Element Program

The finite element method is used to determine the response of a new lightweight rail track system (LR55) to various loading environments. To calculate the vertical displacement of the rail track system and the vertical pressure in the sub-base and sub-grade layers due to wheel loads and loads exerted by transversely passing vehicles across the track, the global stiffness matrix of the structure is determined. This is done by using one and two dimensional finite element programs. In the two dimensional finite element analysis, linear isoparametric elements with 4-node quadrilateral and 3-node triangular shapes in the discretised mesh of the whole structure are used, also non-homogeneous materials with isotropic of linear elastic behaviour are assumed for all the components forming the track system and surrounding media. The results of the one dimensional finite element program are compared with those predicted from analytical approach in order to validate the finite element program developed. From the various examples presented the LR55 proves to withstand the main-line railway loading and the vertical pressure distribution in the sub-base and sub-grade of the pavement are within the allowable limit.

scholarly journals Electrical Modelling of a DC Railway System with Multiple Trains

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3211 ◽  
Author(s):  
Hammad Alnuman ◽  
Daniel Gladwin ◽  
Martin Foster
Keyword(s):  
Power Flow ◽  
Flow Analysis ◽  
Regenerative Braking ◽  
Simulation Tool ◽  
Electrical Characteristics ◽  
Power Demand ◽  
Rail Track ◽  
Track System ◽  
Railway System ◽  
Electrical Modelling

Electrical modelling of rail tracks with multiple running trains is complex due to the difficulties in solving the power flow. The train positions, speed and acceleration are constantly varying resulting in a nonlinear system. In this work, a method is proposed for modelling DC electric railways to support power flow analysis of a simulated metro train service. The method exploits the MathWorks simulation tool Simscape, using it to model the mechanical and electrical characteristics of the rail track system. The model can be simulated to provide voltages at any position in the track and additionally, the voltages seen by any train. The model includes regenerative braking on trains, this is demonstrated to cause overvoltage in the feeding line if it is higher than the power demand of the other trains at that time. Braking resistors are used to protect the network from overvoltage by burning the excess energy. Through the implementation of Energy Storage Systems (ESSs), it will be possible to improve the energy efficiency and remove timetabling restrictions of electric railways by effectively controlling the rail track voltage. The paper proposes several methods to validate the model.

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