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  Subjects -> TRANSPORTATION (Total: 165 journals)
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TRANSPORTATION (99 journals)

Accident Analysis & Prevention     Partially Free   (Followers: 58)
AI & Society     Hybrid Journal   (Followers: 4)
Analytic Methods in Accident Research     Hybrid Journal   (Followers: 1)
Archives of Transport     Open Access   (Followers: 17)
Bitácora Urbano-Territorial     Open Access   (Followers: 1)
Botswana Journal of Technology     Full-text available via subscription  
Case Studies on Transport Policy     Hybrid Journal   (Followers: 5)
Cities in the 21st Century     Open Access   (Followers: 14)
Economics of Transportation     Partially Free   (Followers: 12)
Emission Control Science and Technology     Hybrid Journal   (Followers: 1)
EURO Journal of Transportation and Logistics     Hybrid Journal   (Followers: 7)
European Transport Research Review     Open Access   (Followers: 23)
Geosystem Engineering     Hybrid Journal   (Followers: 2)
IATSS Research     Open Access  
IEEE Vehicular Technology Magazine     Full-text available via subscription   (Followers: 9)
IET Electrical Systems in Transportation     Hybrid Journal   (Followers: 8)
IET Intelligent Transport Systems     Hybrid Journal   (Followers: 7)
International Innovation - Transport     Open Access   (Followers: 9)
International Journal of Applied Logistics     Full-text available via subscription   (Followers: 6)
International Journal of Crashworthiness     Hybrid Journal   (Followers: 7)
International Journal of Critical Infrastructure Protection     Hybrid Journal   (Followers: 5)
International Journal of e-Navigation and Maritime Economy     Open Access  
International Journal of Electric and Hybrid Vehicles     Hybrid Journal   (Followers: 7)
International Journal of Heavy Vehicle Systems     Hybrid Journal   (Followers: 8)
International Journal of Intelligent Transportation Systems Research     Hybrid Journal   (Followers: 9)
International Journal of Micro-Nano Scale Transport     Full-text available via subscription   (Followers: 1)
International Journal of Mobile Communications     Hybrid Journal   (Followers: 9)
International Journal of Ocean Systems Management     Hybrid Journal   (Followers: 3)
International Journal of Physical Distribution & Logistics Management     Hybrid Journal   (Followers: 9)
International Journal of Services Technology and Management     Hybrid Journal  
International Journal of Sustainable Transportation     Hybrid Journal   (Followers: 10)
International Journal of Traffic and Transportation Engineering     Open Access   (Followers: 20)
International Journal of Transportation Science and Technology     Full-text available via subscription   (Followers: 11)
International Journal of Vehicle Systems Modelling and Testing     Hybrid Journal   (Followers: 5)
International Journal of Vehicular Technology     Open Access   (Followers: 5)
Journal of Advanced Transportation     Hybrid Journal   (Followers: 12)
Journal of Mechatronics, Electrical Power, and Vehicular Technology     Open Access   (Followers: 5)
Journal of Modern Transportation     Full-text available via subscription   (Followers: 6)
Journal of Navigation     Hybrid Journal   (Followers: 116)
Journal of Sport & Social Issues     Hybrid Journal   (Followers: 8)
Journal of Sustainable Mobility     Full-text available via subscription   (Followers: 1)
Journal of Traffic and Transportation Engineering (English Edition)     Open Access   (Followers: 3)
Journal of Transport & Health     Hybrid Journal   (Followers: 5)
Journal of Transport and Land Use     Open Access   (Followers: 21)
Journal of Transport and Supply Chain Management     Open Access   (Followers: 9)
Journal of Transport Geography     Hybrid Journal   (Followers: 19)
Journal of Transport History     Full-text available via subscription   (Followers: 13)
Journal of Transport Literature     Open Access   (Followers: 6)
Journal of Transportation Safety & Security     Hybrid Journal   (Followers: 8)
Journal of Transportation Security     Hybrid Journal   (Followers: 3)
Journal of Transportation Systems Engineering and Information Technology     Full-text available via subscription   (Followers: 12)
Journal of Transportation Technologies     Open Access   (Followers: 15)
Journal of Waterway Port Coastal and Ocean Engineering     Full-text available via subscription   (Followers: 8)
Les Dossiers du Grihl     Open Access   (Followers: 1)
Logistics & Sustainable Transport     Open Access  
Logistique & Management     Full-text available via subscription  
Mobility in History     Full-text available via subscription   (Followers: 2)
Modern Transportation     Open Access   (Followers: 8)
Nonlinear Dynamics     Hybrid Journal   (Followers: 5)
Open Journal of Safety Science and Technology     Open Access   (Followers: 7)
Pervasive and Mobile Computing     Hybrid Journal   (Followers: 9)
Proceedings of the Institution of Mechanical Engineers Part F: Journal of Rail and Rapid Transit     Hybrid Journal   (Followers: 10)
PS: Political Science & Politics     Full-text available via subscription   (Followers: 23)
Public Transport     Hybrid Journal   (Followers: 17)
Recherche Transports Sécurité     Hybrid Journal   (Followers: 1)
Research in Transportation Business and Management     Partially Free   (Followers: 3)
Revista Transporte y Territorio     Open Access   (Followers: 1)
Romanian Journal of Transport Infrastructure     Open Access  
SourceOCDE Transports     Full-text available via subscription   (Followers: 2)
Sport, Education and Society     Hybrid Journal   (Followers: 12)
Sport, Ethics and Philosophy     Hybrid Journal   (Followers: 1)
Streetnotes     Open Access   (Followers: 1)
Synthesis Lectures on Mobile and Pervasive Computing     Full-text available via subscription   (Followers: 2)
Tire Science and Technology     Full-text available via subscription   (Followers: 3)
Transactions on Transport Sciences     Open Access   (Followers: 5)
Transport     Hybrid Journal   (Followers: 13)
Transport and Telecommunication Journal     Open Access   (Followers: 4)
Transport in Porous Media     Hybrid Journal   (Followers: 1)
Transport Reviews: A Transnational Transdisciplinary Journal     Hybrid Journal   (Followers: 9)
Transportation     Hybrid Journal   (Followers: 26)
Transportation Geotechnics     Full-text available via subscription   (Followers: 1)
Transportation Infrastructure Geotechnology     Hybrid Journal   (Followers: 7)
Transportation Journal     Full-text available via subscription   (Followers: 12)
Transportation Letters : The International Journal of Transportation Research     Hybrid Journal   (Followers: 2)
Transportation Research Part A: Policy and Practice     Hybrid Journal   (Followers: 29)
Transportation Research Part B: Methodological     Hybrid Journal   (Followers: 28)
Transportation Research Part C: Emerging Technologies     Hybrid Journal   (Followers: 19)
Transportation Research Procedia     Open Access   (Followers: 2)
Transportation Research Record : Journal of the Transportation Research Board     Full-text available via subscription   (Followers: 34)
Transportation Science     Full-text available via subscription   (Followers: 19)
TRANSPORTES     Open Access   (Followers: 4)
Transportmetrica A : Transport Science     Hybrid Journal   (Followers: 3)
Transportmetrica B : Transport Dynamics     Hybrid Journal   (Followers: 2)
Travel Behaviour and Society     Full-text available via subscription   (Followers: 4)
Travel Medicine and Infectious Disease     Hybrid Journal   (Followers: 1)
Urban, Planning and Transport Research     Open Access   (Followers: 25)
Vehicular Communications     Full-text available via subscription   (Followers: 2)
World Review of Intermodal Transportation Research     Hybrid Journal   (Followers: 5)
Транспортні системи та технології перевезень     Open Access  
Journal Cover Proceedings of the Institution of Mechanical Engineers Part F: Journal of Rail and Rapid Transit
  [SJR: 0.457]   [H-I: 24]   [10 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0954-4097 - ISSN (Online) 2041-3017
   Published by Sage Publications Homepage  [835 journals]
  • A study of railway wheel profile parameters used as indicators of an
           increased risk of wheel defects
    • Authors: Asplund, M; Palo, M, Famurewa, S, Rantatalo, M.
      Pages: 323 - 334
      Abstract: The capacity demands on railways will increase in the future, as will demands for a robust and available system. The availability of a railway system is dependent on the condition of its infrastructure and rolling stock. To inspect rolling stock so as to prevent damage to the track due to faulty wheels, infrastructure managers normally install wayside monitoring systems along the track. Such systems indicate, for example, wheels that fall outside the defined safety limits and have to be removed from service to prevent further damage to the track. Due to the nature of many wayside monitoring systems, which only monitor vehicles at defined points along the track, damage may be induced on the track prior to fault detection at the location of the system. Such damage can entail capacity-limiting speed reductions and manual track inspections before the track can be reopened for traffic. The number of wheel defects must therefore be kept to a minimum. In this paper, wheel profile parameters measured by a wayside wheel profile measurement system, installed along the Swedish Iron Ore Line, are examined and related to warning and alarm indications from a wheel defect detector installed on the same line. The study shows that an increased wheel wear, detectable by changes in the wheel profile parameters, could be used to reduce the risk of capacity-limiting wheel defect failure events and their reactive measures.
      PubDate: 2016-01-11T21:11:35-08:00
      DOI: 10.1177/0954409714541953
      Issue No: Vol. 230, No. 2 (2016)
  • Determination of the optimal span length to minimize resonance effects in
           bridges on high-speed lines
    • Authors: Cho, J.-R; Jung, K, Cho, K, Kwark, J.-W, Kim, Y. J, Kim, B.-S.
      Pages: 335 - 344
      Abstract: This paper revisits the creation and cancellation of the dynamic resonance phenomenon that occurs in bridge structures on high-speed lines when crossed by wheel loads. The resonance and its cancellation are mathematically formulated for a Bernoulli-type beam with general boundary conditions and subjected to loads moving at a regular spacing. The resonance of the bridge caused by the travelling loads occurs, regardless of the mode shape, when the natural frequency of the structure coincides with the loading frequency produced by the loads moving at a constant speed. In this study, the dependency of the cancellation phenomenon on the mode shape is determined based on the boundary conditions of the structure. In addition, the optimal span length that suppresses the response at resonance is proposed using the cancellation phenomenon for a simple beam with pinned-pinned, clamped-clamped and clamped-pinned boundary conditions; and a simply supported continuous beam.
      PubDate: 2016-01-11T21:11:35-08:00
      DOI: 10.1177/0954409714542140
      Issue No: Vol. 230, No. 2 (2016)
  • Energy savings in metro-transit systems: A comparison between operational
           Italian and Spanish lines
    • Authors: Falvo, M. C; Sbordone, D, Fernandez-Cardador, A, Cucala, A. P, Pecharroman, R. R, Lopez-Lopez, A.
      Pages: 345 - 359
      Abstract: For transportation in large cities, new technologies that impact the operation of metro-transit systems are being developed. The energy efficiency in metro-transit systems is a key topic that is being studied in order to reduce both consumption and costs. A review on approaches to managing the energy recovered from train braking is reported. Then, energy performance indexes are presented. Their assessment is possible due to highly specialized simulation tools that have been developed at the University of Rome Sapienza and Comillas Pontifical University, Madrid. The indexes are used to perform a comparison between an operational metro-line in Spain and one in Italy. The results confirm their accuracy and significant improvements in energy efficiency and environmental effects are presented.
      PubDate: 2016-01-11T21:11:35-08:00
      DOI: 10.1177/0954409714542276
      Issue No: Vol. 230, No. 2 (2016)
  • Optimisation of the elastic track properties of turnout crossings
    • Authors: Wan, C; Markine, V, Shevtsov, I.
      Pages: 360 - 373
      Abstract: Rail pads and under sleeper pads (USPs) are resilient elements inserted between the rail and the sleeper, and between the sleeper and the ballast, respectively. They improve the elastic properties of the track’s superstructure. In this paper, the approach of estimating the performance of a turnout by using the dynamic forces acting on the crossing as indicators of the extent of crossing nose damage is improved by tuning the stiffness and damping of the rail pads and USPs using a numerical optimisation method. In the optimisation problem, the dynamic forces acting on rails, sleepers and the ballast bed, which should be minimised, are considered in the objective function. Constraints are imposed on the displacements of the structural elements of the turnout crossing. The combined multi-objective optimisation problem is solved using the multipoint approximation method. The results of the optimisation show that application of softer rail pads combined with USPs can significantly reduce the dynamic forces acting on the rails, sleepers and ballast. Moreover, the track elasticity should be varied along the crossing.
      PubDate: 2016-01-11T21:11:35-08:00
      DOI: 10.1177/0954409714542478
      Issue No: Vol. 230, No. 2 (2016)
  • Modelling and model validation of an electropneumatic brake on subway
    • Authors: Luo, Z; Wu, M, Zuo, J, Tian, C.
      Pages: 374 - 391
      Abstract: In this paper, a model of the electropneumatic brake used on subway trains is developed; it facilitates brake system analysis, fault diagnosis and controller design. This objective is met by decomposing an electropneumatic brake into smaller modules and developing detailed models at three levels. The basic subcomponent models of the electropneumatic brake are built using a lumped parameter method. Then individual models are developed based on the subcomponent models. Finally, a complete model of the electropneumatic brake is developed by assembling all the valve models. Simulation models of these three levels are built using Matlab-Simulink. Important subcomponent models are verified by comparison with experimental results. Furthermore, a test rig is set-up to validate the complete brake model. Experimental and simulated results suggest that the model is able to closely predict the behaviour of the electropneumatic brake: brake filling and releasing time differences between experimental and simulated results are less than 10%; the cause of steady state pressure error of a real electropneumatic brake can be explained using the model; other behaviour of a real electropneumatic brake (sharp pressure jump and drop, pressure oscillation, thermal exchange) can be predicted and better understood using the proposed model.
      PubDate: 2016-01-11T21:11:35-08:00
      DOI: 10.1177/0954409714542860
      Issue No: Vol. 230, No. 2 (2016)
  • Estimation of the damping effects of suspension systems on railway
           vehicles using wedge tests
    • Authors: Shi, H.-l; Wu, P.-b, Luo, R, Zeng, J.
      Pages: 392 - 406
      Abstract: The damping ratios of suspension systems on a railway vehicle were estimated in terms of the free-decay responses obtained by applying the logarithmic-decrement method to data obtained in wedge tests. The characteristics of the free-decay responses were measured both for motor and trailer cars experiencing either the tare loading (AW0) or crush loading (AW3) condition and either inflated or deflated air springs. The considered cases included bouncing, pitching, rolling and lateral motions. A dynamic model was established and the simulation results were compared with the experimental results. For the vertical cases, the time cycles and displacement amplitudes of the free-decay response are related to the state of the air springs and the vehicle load. The damping ratio of the secondary suspension for inflated air springs is about three to five times higher than for when the air springs are deflated. For the primary suspension, it is two to four times higher. Also the heavier the carbody loads, the much more severe is the divergence. Furthermore, the damping ratios have their largest values for the pitching modes, followed by the bouncing modes and finally the rolling modes. For the lateral cases, the free-decay responses have similar characteristics to those of the vertical responses but with smaller amplitudes. All the tests show good agreement with one another, and the primary and secondary suspensions show similar regularities. The simulations show a good agreement with the test results and highlight that the initial velocity has only a limited effect on the test results.
      PubDate: 2016-01-11T21:11:35-08:00
      DOI: 10.1177/0954409714542861
      Issue No: Vol. 230, No. 2 (2016)
  • An optimal age-usage maintenance strategy containing a failure penalty for
           application to railway tracks
    • Authors: Shafiee, M; Patriksson, M, Chukova, S.
      Pages: 407 - 417
      Abstract: Railway track maintenance plays a key role in enhancing the reliability and safety of railway transportation, as it reduces the potential risks of defects and derailments. A railway track degrades over time, due to its cumulative usage (in terms of million gross tons) that results from traffic movements. When the cumulative usage reaches a failure threshold, the railway track breaks and has to be replaced with a new section. Moreover, the infrastructure owner charges the maintenance agent a specific penalty due to traffic disrruption and passenger dissatisfaction. To avoid such costly defects, the railway tracks must be preventively replaced at regular time intervals. In this paper, we propose an optimal bivariate (age–usage) maintenance strategy for railway tracks such that the average long-run maintenance cost per unit time is minimized. The proposed model is applied to 60E1 track on a small part of the Swedish heavy haul line ‘Malmbanan’, and the results are compared with two conventional age-based and usage-based maintenance policies. The results show that the proposed maintenance policy has a substantial potential to reduce the servicing costs of railway track maintenance.
      PubDate: 2016-01-11T21:11:35-08:00
      DOI: 10.1177/0954409714543337
      Issue No: Vol. 230, No. 2 (2016)
  • Post-derailment dynamic behavior of railway vehicles travelling on a
           railway bridge during an earthquake
    • Authors: Wu, X; Chi, M, Gao, H, Ke, X, Zeng, J, Wu, P, Zhu, M.
      Pages: 418 - 439
      Abstract: This study developed a post-derailment dynamic model of railway vehicles to investigate their post-derailment dynamic behavior when travelling on a railway bridge during an earthquake. The model is composed of three parts: multi-body dynamic model of the railway vehicle, a collision detection model, and a contact force model. The dynamic model considered all the various kinds of contacts that may occur during the derailment, such as wheel/track slab contacts, wheel/fastener contacts, and brake-disc/rail contacts. A collision detection model that was based on the tight-fitting oriented bounding box trees approach was adopted to detect the collision situations during the derailment. The contact force model was used to calculate the contact force based on a Hertz spring-damper and the Coulomb friction law. Using this model, the post-derailment dynamic behavior of railway vehicles travelling on a railway bridge experiencing earthquake excitations was investigated. First, a seismic response analysis of the railway bridge was conducted in order to obtain the seismic response of the railway bridge; it was subsequently used as the input to the post-derailment dynamic model. Then the derailment postures of the vehicle and contact situations were fully analyzed to understand the post-derailment dynamic behavior of railway vehicles during the earthquake. The obtained results show that the brake disc adopted in the model has the ability to limit the deviation of the wheelsets after the derailment.
      PubDate: 2016-01-11T21:11:35-08:00
      DOI: 10.1177/0954409714543338
      Issue No: Vol. 230, No. 2 (2016)
  • A numerical investigation on the lateral resistance of frictional sleepers
           in ballasted railway tracks
    • Authors: Ali Zakeri, J; Esmaeili, M, Kasraei, A, Bakhtiary, A.
      Pages: 440 - 449
      Abstract: The lateral stability of ballasted railway tracks is a function of the lateral resistance of the sleepers created by interaction with ballast materials. Thus, one of the approaches for increasing the lateral resistance of sleepers has been to increase bottom friction and use frictional sleepers. A review of the technical literature showed that numerous experimental studies have been performed on this type of sleeper; however, no numerical analysis has been conducted on its lateral resistance. Therefore, this paper developed a finite element numerical model for investigating frictional concrete sleepers. In this regard, a hardening elasto-plastic behavior model was developed for the ballast layer and ABAQUS software was used to numerically analyze the lateral resistance of this type of concrete sleeper. Using the developed model, some sensitivity analyses were performed on the parameters that affect the lateral resistance including the thickness and extent of the ballast shoulder, and the friction coefficient between the ballast layer and sleeper. The obtained results indicated that increasing the ballast shoulder from 25 to 40 cm resulted in about a 16–22% increase in lateral resistance, whereas increasing the friction coefficient from 0.1 to 0.8 led to about a 22–28% increase in the lateral resistance. On the other hand, on decreasing the ballast layer thickness from 30 to 20 cm, the lateral resistance increased by about 12–17%. In summary, it can be concluded that, compared with conventional concrete sleepers, frictional sleepers increased the lateral resistance by about 63–70%.
      PubDate: 2016-01-11T21:11:35-08:00
      DOI: 10.1177/0954409714543507
      Issue No: Vol. 230, No. 2 (2016)
  • Impact analysis due to multiple wheel flats in three-dimensional railway
           vehicle-track system model and development of a smart wheelset
    • Authors: Uzzal, R. U. A; Ahmed, W, Bhat, R. B.
      Pages: 450 - 471
      Abstract: Wheel flats can create high-magnitude impact forces at the wheel/rail interface, these can induce high levels of local stress leading to fatigue damage, and failure of various vehicle and track components. With demands for increased load and speed levels, the issue of a strategy for effective maintenance and in-time replacement of defective wheel-flat-containing wheels has become an important concern for heavy haul operators. A comprehensive coupled vehicle/track model is generally used to predict the impact forces and the resulting component stresses in the presence of multiple flats. This paper considers the dynamic impact responses due to the presence of multiple flats. The characteristics of the bounce, pitch, and roll motions of the bogie due to a flat on a single wheel are investigated. The effect of multiple flats on the peak acceleration of a wheel is investigated for different sizes and relative positions of the flats, i.e. in-phase and out-of-phase conditions. This paper further presents the development of a smart wheelset for the detection of wheel flats for two different load conditions; it is based on a derived relationship between the peak wheel acceleration, vehicle speed and flat size.
      PubDate: 2016-01-11T21:11:35-08:00
      DOI: 10.1177/0954409714545558
      Issue No: Vol. 230, No. 2 (2016)
  • Processing of collector acceleration data for condition-based monitoring
           of overhead lines
    • Authors: Carnevale, M; Collina, A.
      Pages: 472 - 485
      Abstract: This paper describes a diagnostic system for overhead line monitoring; it is based on the measurement of collector accelerations, and aimed at improving current scheduled methods for catenary and pantograph maintenance, making condition-based maintenance possible. The proposed setup is inexpensive and easy to install on in-service commercial trains. Meaningful indicators of pantograph/catenary interactions are obtained by the processing and analysis of data on collector accelerations; summarized values are computed in real-time during the train run and compared with alarm limits.
      PubDate: 2016-01-11T21:11:35-08:00
      DOI: 10.1177/0954409714545637
      Issue No: Vol. 230, No. 2 (2016)
  • Measurement of vertical geometry variations in railway turnouts exposed to
           different operating conditions
    • Pages: 486 - 501
      Abstract: Turnouts are critical units in a railway system; they perform the switching procedure that allows trains to change between routes. Monitoring the track geometry of a turnout is necessary for maintenance planning and design optimisation. Monitoring is usually done by track recording cars, however, to isolate the ageing and dynamic behaviour of the track it is also necessary to study the unstressed track geometry of the turnouts. Such measurements can be used to develop degradation models to optimise maintenance and design, thereby increasing availability and reducing life cycle cost. This paper introduces a new method to measure the vertical position of the track geometry over time during non-operational conditions (unstressed) to show track degradation. The new method includes a smart system that uses relative measurement reference points to create a better accuracy and lower costs compared with fixed reference points. It evaluates various types of measurement equipment and uses levelling equipment to measure the unstressed vertical geometry of 13 turnouts located on Swedish railway lines, with three follow-up measurements over a year and a half. The turnouts were categorised into four groups: based on their accumulated capacity in million gross tonnes (MGT) and whether they were on a straight or curved main track. Surprisingly, the first three measurements showed the geometry of turnouts on the straight main track to have a vertical elevation tendency towards the mid-section, whereas the turnouts on the curved main track had a general vertical downwards bend tendency towards the mid-section. The results also showed that a higher capacity in MGT has a greater influence on track geometry changes over time.
      PubDate: 2016-01-11T21:11:35-08:00
      DOI: 10.1177/0954409714546205
      Issue No: Vol. 230, No. 2 (2016)
  • Analysis of the temperature of the rail/wheel contact surface using a
           half-space model and a moving heat source
    • Authors: Kolonits; F.
      Pages: 502 - 509
      Abstract: The model can be used to analyse the thermal processes due to a frictional block or disc braking or to analyse the temperature conditions close to the ril/wheel contact patch, when macroscopic sliding occurs. It is especially useful in the evaluation of rail chill, head check and other contact tribology-based local heat and stress effects. The contact seizure theory of gear drives developed by Blok is based on a simplified approach to the determination of the temperature due a moving heat source generated by sliding friction. In a simplifying step, the heat flux parallel to the surface of the contacting bodies is disregarded. One-dimensional temperature patterns that vary with time are arranged along the line of motion, based on the displacement of the source. This one-dimensional model is applicable if the velocity (i.e. Péclet number) is ‘high enough’. The influence of the width of the source has not been examined. The literature contains analytical results for various heat flux models, and one can make use of them to overcome the restrictions inherent in the one-dimensional theory. However, their rather complex structure makes them unsuited for further analysis, and only the numerical analysis method appears to be fruitful. One approach is to describe the temperature conditions created in a plate, which extends on a half-plane, by heating a part of its edge. The obtained time-dependent temperature results can be arranged into a sequence in a similar manner as in the approach of Blok. This shows the spatial temperature distribution that can be obtained by enhancing the results obtained using the one-dimensional theory by considering the effect of the crosswise dispersed heat. For heat sources of limited width, the cross-corrected approach better fits the reference values given by a full three-dimensional model. In railway traction, the analysis can be most directly applied to gear drives with a localized load pattern.
      PubDate: 2016-01-11T21:11:35-08:00
      DOI: 10.1177/0954409714548101
      Issue No: Vol. 230, No. 2 (2016)
  • Prediction of structural vibrations using a coupled vehicle-track-building
    • Authors: Hou, B; Gao, L, Xin, T, Cai, X.
      Pages: 510 - 530
      Abstract: As a result of local factors, limited amounts of land and construction demands, subway lines are sometimes designed to run in close proximity to buildings. Hence, using a real Beijing subway engineering project, we have studied the vibration induced in a building by a moving rail vehicle. A numerical model of the spatially coupled vehicle–track–building system was developed to predict the vibration levels in the structure. The modeling theory was verified by comparison with multi-body system simulations and field test results. Two common types of track, namely, ballasted track and floating slab track were studied and their vibration-mitigation effects were compared in the time and frequency domains. A comparison of the particle peak velocities with the structural vibration limits of the floating floor slab and the first floor of a building revealed a very low possibility of severe damage resulting from vehicle-induced vibration for both types of tracks. We also conducted a one-third octave analysis of the vibration of each building floor and obtained the weighted root-mean-squared acceleration and vibration levels. A comparison of the weighted accelerations with the vibration limits for vibration perception by a human for both types of tracks also revealed that train-induced vibration had no obvious effect on daily human activities on most of the floors. The main exception to this observation was the first floor, which is located close to the vibration source. It is recommended that the first floor should be used for purposes other than residential. Furthermore, a comparison of the vibration levels of each floor for both types of tracks showed that the ballasted track had a better vibration-mitigation effect than the floating slab track for this special engineering case.
      PubDate: 2016-01-11T21:11:35-08:00
      DOI: 10.1177/0954409714548244
      Issue No: Vol. 230, No. 2 (2016)
  • Determination of the optimal span length for a railway bridge crossed by
           various types of high-speed trains
    • Authors: Cho, J.-R; Jung, K, Cho, K, Kwark, J.-W, Kim, Y. J, Kim, B.-S.
      Pages: 531 - 543
      Abstract: This paper proposes a method that can be used during the preliminary design stage to determine the optimal span length of a railway bridge that minimizes its dynamic responses to the passage of high-speed trains. Since the designed speed for passage over a railway bridge is generally higher than the speed at which the resonance phenomenon occurs, the peak dynamic responses of the bridge are likely to occur when a train travels across a bridge. Therefore, this study suggests inertia and elastic spectra that represent the inertial force and elastic force per unit length of the bridge at the resonance condition, respectively. These spectra are defined as functions of the span length of the bridge, for which the type of train and damping ratio are fixed, and based on the relationship between the dynamic responses of two different railway bridges that was used as theoretical basis for the design diagram proposed by the European Rail Research Institute. The optimal span length of the bridge that produces the smallest responses is determined using the suggested spectra by quantitatively comparing the responses at resonance under various train loads as a function of the span length of the bridge. The proposed method is validated using numerical examples that consider the computation of the optimal span length of a simply supported single-span bridge crossed by individual KTX, HEMU and ICE 2 trains and combinations of these trains.
      PubDate: 2016-01-11T21:11:35-08:00
      DOI: 10.1177/0954409714549083
      Issue No: Vol. 230, No. 2 (2016)
  • Effect of micro-inclusions on subsurface-initiated rolling contact fatigue
           of a railway wheel
    • Authors: Zeng, D; Lu, L, Zhang, J, Jin, X, Zhu, M.
      Pages: 544 - 553
      Abstract: The objectives of this paper are to investigate the size of the maximum micro-inclusion in a railway wheel using ultrasonic fatigue testing and to evaluate the effect of the micro-inclusion on subsurface-initiated rolling contact fatigue of the railway wheel. Fatigue specimens with a large risk volume were quenched, tempered and oxynitrocarburized to increase both the strength of the matrix and the resistance to surface corrosion, which ensured that all of the specimens fractured from the internal inclusion under water cooling. The test results show that the size of the micro-inclusion obtained using the fatigue method are much larger than those obtained by a traditional surface analysis method, which means that the accuracy of the fatigue method is higher than that of the traditional method. The maximum square root of the micro-inclusion area and the maximum length of the major axis of the elliptical micro-inclusion for a full-sized railway wheel are estimated using the statistics of extreme values method to be 296 µm and 736 µm, respectively. Based on the estimated maximum micro-inclusion sizes and principles of fracture mechanics, the critical loading of the railway wheel for both subsurface-initiated fatigue and fatigue initiated at a deep-lying material defect are obtained.
      PubDate: 2016-01-11T21:11:35-08:00
      DOI: 10.1177/0954409714551808
      Issue No: Vol. 230, No. 2 (2016)
  • A full-scale physical model test apparatus for investigating the dynamic
           performance of the slab track system of a high-speed railway
    • Authors: Bian, X; Jiang, H, Chen, Y, Jiang, J, Han, J.
      Pages: 554 - 571
      Abstract: This study involves the development of a full-scale physical model test apparatus to investigate the dynamic performance of the slab track system of a high-speed railway. A portion of a railway ballastless track with embankment and underlying soil strata was built inside a steel box (15 m long, 5 m wide and 6 m high). A sequential-load-generating system consisting of eight high-performance actuators was developed to apply a load that was equivalent to that generated by a train moving at speeds up to 360 km/h. Two loading conditions can be implemented in the tests, a stationary cyclic loading (using one actuator) or a simulated moving train loading (using all eight actuators). Three test cases were performed to demonstrate the capacity of the proposed test facility. The first case was to test the load-sharing ratio of fasteners beneath the rails to determine the load distribution on the track slab. A formula, based on the test results, was proposed to determine the transfer process of the loads between the train wheel and the rail fasteners. The second case was a stationary cyclic loading test, which applied loads with varying frequencies to the rails using a single actuator. The resonance frequency of the track/embankment/soil system was determined in these tests to be about 16 Hz, which coincided with theoretically computed results and field measurements. The final case was to simulate the dynamic excitation resulting from the passage of a train on the track at various speeds (up to 360 km/h). The test results on track vibrations in the physical model test showed reasonably good agreement with field measurements. These three test cases fully demonstrate the ability of the newly developed full-scale test facility to simulate dynamic excitation from trains and its ability to explore the dynamic performance of railway structures under train loadings.
      PubDate: 2016-01-11T21:11:35-08:00
      DOI: 10.1177/0954409714552113
      Issue No: Vol. 230, No. 2 (2016)
  • Fatigue assessment of old design axles: Service simulation and life
    • Authors: Mazzola, L; Regazzi, D, Beretta, S, Bruni, S.
      Pages: 572 - 584
      Abstract: This paper proposes a damage-tolerant approach for ensuring the safe operation of railway axles with an old, non-EN-compliant design, until completion of their life cycle. The approach consists in defining a suitable non-destructive testing (NDT) inspection programme, which is based on the precise evaluation of service loads using multi-body simulation and on validated crack propagation models. The application of the proposed approach is presented for two different test cases, both representing old design axles for urban railway vehicles. It is demonstrated that NDT inspection intervals are highly dependent on the specific axle design and service scenarios, particularly with regard to the effects of braking.
      PubDate: 2016-01-11T21:11:35-08:00
      DOI: 10.1177/0954409714552699
      Issue No: Vol. 230, No. 2 (2016)
  • The proposal of validation metrics for the assessment of the quality of
           simulations of the dynamic behaviour of railway vehicles
    • Authors: Bogojevic, N; Lucanin, V.
      Pages: 585 - 597
      Abstract: This paper introduces new validation metrics that may be used for the validation of models of railway vehicles. The proposed validation metrics are based on a comparison between the cumulative distribution functions of selected parameters obtained by simulation and measurements. A model of a freight railway vehicle has been developed and the proposed validation metrics were used in model validation. The results of the validation were compared with the results of validation metrics used in the ‘DynoTRAIN’ project. It was shown that the proposed metric is more severe than the metrics used in the project; a result of it comparing the complete domains of the cumulative distribution functions and not only the selected characteristic values.
      PubDate: 2016-01-11T21:11:35-08:00
      DOI: 10.1177/0954409714552700
      Issue No: Vol. 230, No. 2 (2016)
  • Classification-learning-based framework for predicting railway track
    • Authors: Bai, L; Liu, R, Sun, Q, Wang, F, Wang, F.
      Pages: 598 - 610
      Abstract: Railway track irregularities are key factors that affect the safety of trains and the comfort of passengers. In this study, a railway track is separated into consecutive track maintenance units, which are used as research objects. We propose a novel framework, which is referred to as the tree-augmented naïve Bayes-track quality index (TAN-TQI), to identify possible underlying patterns or rules for predicting track irregularities based on the characteristic deterioration of track maintenance units. The prediction framework is validated using track irregularity data measured using track geometry cars. Our evaluation shows that the prediction performance of the TAN-TQI framework is better than that of the state-of-the-art method, the short-range prediction method for track quality index.
      PubDate: 2016-01-11T21:11:35-08:00
      DOI: 10.1177/0954409714552818
      Issue No: Vol. 230, No. 2 (2016)
  • Cost-effective track geometry maintenance limits
    • Authors: Arasteh khouy, I; Larsson-Kraik, P.-O, Nissen, A, Kumar, U.
      Pages: 611 - 622
      Abstract: In the past, railway maintenance actions were usually planned based on the knowledge and experience of the infrastructure owner. The main goal was to provide a high level of safety, and there was little concern about economic and operational optimisation issues. Today, however, a deregulated competitive environment and budget limitations are forcing railway infrastructures to move from safety limits to cost-effective maintenance limits to optimise operation and maintenance procedures. By so doing, one widens the discussion to include both operational safety and cost-effectiveness for the whole railway transport system. In this study, a cost model is proposed to specify the cost-effective maintenance limits for track geometry maintenance. The proposed model considers the degradation rates of different track sections and takes into account the costs associated with inspection, tamping, delay time penalties, and risk of accidents due to poor track quality. It draws on track geometry data from the Iron Ore Line (Malmbanan) in northern Sweden, used by both passenger and freight trains, to estimate the geometrical degradation rate of each section. The methodology is based on reliability and cost analysis and facilitates the maintenance decision-making process to identify cost-effective maintenance thresholds.
      PubDate: 2016-01-11T21:11:35-08:00
      DOI: 10.1177/0954409714542859
      Issue No: Vol. 230, No. 2 (2016)
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