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  • 1.
    Alonso, Asier
    et al.
    CAF I+D.
    Casanueva, Carlos
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
    Perez, Javier
    CAF S.A..
    Stichel, Sebastian
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
    Physical damage mechanisms for uniform wear calculation2018In: Proceedings of the 11th International Conference on Contact Mechanics and Wear of Rail/wheel Systems, CM 2018, Delft, The Netherlands, 2018Conference paper (Other academic)
    Abstract [en]

    This work presents the initial steps given in order to obtain a comprehensive physical model for the specific case of wheel rail contact, which would be able to relate contact conditions, material properties and wear rates. The main advantage of a physical damage wear model is that wheelset an rail manufacturers can perform simulations in order to improve and optimize material properties for different operational cases. The initial work has focused on delaminative wear, starting with the importance and modelling of rough contact, and a comparison against classic smooth contact models. 

  • 2.
    Altimira, Mireia
    et al.
    KTH, School of Engineering Sciences (SCI), Mechanics.
    Casanueva, Carlos
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
    RAISING AWARENESS ON DIVERSITY AND EQUALITY IN STEM DEGREES IN HIGHER EDUCATION2017In: INTED2017: 11TH INTERNATIONAL TECHNOLOGY, EDUCATION AND DEVELOPMENT CONFERENCE / [ed] Chova, LG Martinez, AL Torres, IC, IATED-INT ASSOC TECHNOLOGY EDUCATION A& DEVELOPMENT , 2017, p. 1037-1041Conference paper (Refereed)
    Abstract [en]

    Higher education environments are becoming more and more diverse, regarding both gender and cultural background, which could pose significant challenges for both students and teachers. In order to raise the topic amongst STEM students, a lecture on Diversity has been implemented in the course Research Methodologies for Engineering Mechanics, where different concepts regarding equality have been introduced and unconscious bias have been explained to the students. The lecture was placed in the middle of the course so that students could reflect back on their previous evaluations and enable them to correct their biases in the second half of the course. Feedback of the whole course has also been compared between the 2016 and 2015 editions, where this lecture was not present. The results show that a lecture in Diversity and Equality is especially useful for female students, strongly supporting its inclusion in the course.

  • 3.
    Andersson, Evert
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles. KTH, School of Engineering Sciences (SCI), Centres, The KTH Railway Group.
    Berg, Mats
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles. KTH, School of Engineering Sciences (SCI), Centres, The KTH Railway Group.
    Stichel, Sebastian
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles. KTH, School of Engineering Sciences (SCI), Centres, The KTH Railway Group.
    Casanueva, Carlos
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles. KTH, School of Engineering Sciences (SCI), Centres, The KTH Railway Group.
    Rail Systems and Rail Vehicles: Part 2: Rail Vehicles2016 (ed. 1)Book (Other (popular science, discussion, etc.))
    Abstract [en]

    This compendium is mainly intended for MSc education in rail vehicle engineering at KTH Royal Institute of Technology, Stockholm, Sweden. The objective is to give an overview and fundamental knowledge of different rail systems, followed by a more thorough introduction to rail vehicles. In this way most rail aspects are covered. The compendium consists of 20 chapters.

  • 4. Apezetxea, I. S.
    et al.
    Perez, X.
    Casanueva, Carlos
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
    Alonso, A.
    New methodology for fast prediction of wheel wear evolution2017In: Vehicle System Dynamics, ISSN 0042-3114, E-ISSN 1744-5159, Vol. 55, no 7, p. 1071-1097Article in journal (Refereed)
    Abstract [en]

    In railway applications wear prediction in the wheel–rail interface is a fundamental matter in order to study problems such as wheel lifespan and the evolution of vehicle dynamic characteristic with time. However, one of the principal drawbacks of the existing methodologies for calculating the wear evolution is the computational cost. This paper proposes a new wear prediction methodology with a reduced computational cost. This methodology is based on two main steps: the first one is the substitution of the calculations over the whole network by the calculation of the contact conditions in certain characteristic point from whose result the wheel wear evolution can be inferred. The second one is the substitution of the dynamic calculation (time integration calculations) by the quasi-static calculation (the solution of the quasi-static situation of a vehicle at a certain point which is the same that neglecting the acceleration terms in the dynamic equations). These simplifications allow a significant reduction of computational cost to be obtained while maintaining an acceptable level of accuracy (error order of 5–10%). Several case studies are analysed along the paper with the objective of assessing the proposed methodology. The results obtained in the case studies allow concluding that the proposed methodology is valid for an arbitrary vehicle running through an arbitrary track layout.

  • 5.
    Casanueva, Carlos
    CEIT and Tecnun, University of Navarra.
    Análisis dinámico de un eje de ferrocarril con capacidad de cambio de ancho automático2010Doctoral thesis, monograph (Other academic)
    Abstract [es]

    El objetivo de la presente tesis es la mejora de los actuales ejes de ancho variable para su circulación por vías de alta velocidad (AV) a velocidades de hasta 300km/h. En la actualidad los vehículos con ejes de ancho variable no sobrepasan los 250km/h de velocidad de servicio en vías de AV, lo que supone un claro desaprovechamiento de recursos y dificultades de gestión del tráfico para el gestor de la infraestructura a causa de las distintas velocidades punta de los diferentes trenes.

    Los modelos ferroviarios convencionales no tienen en cuenta la flexibilidad asociada a los ejes y suponen que éstos son lo suficientemente rígidos como para no necesitar una modelización que tenga en cuenta su deformación estructural.

    Sin embargo, en los ejes de ancho variable, que poseen tanto mecanismos que permiten el desplazamiento lateral de rueda respecto al cuerpo de eje como mecanismos de bloqueo de dicho desplazamiento, tienen influencia diversas holguras, rozamiento entre superficies, y componentes intermedios entre ruedas y cuerpo de eje. Estos efectos provocan una flexibilización de la conexión entre ruedas y cuerpo de eje que es necesario estudiar.

    Por otra parte, en el caso de los ejes de ancho variable de cuerpo de eje no rotativo sus menores solicitaciones a fatiga permiten una importante reducción del diámetro del cuerpo de eje. Esto provoca una flexibilidad adicional muy superior a la de los ejes convencionales.

    Para el estudio de la influencia de este aumento de flexibilidad en el comportamiento dinámico del eje, en primer lugar se determina qué tipo de modelo permite la correcta representación de los efectos presentes en los análisis dinámicos. Además, se analiza en profundidad el comportamiento del eje de ancho variable, para facilitar el posterior estudio y simplificaciones, así como identificar los componentes críticos del mecanismo.

    En segundo lugar se calculan las relaciones esfuerzo-deformación para los distintos componentes del sistema: conjunto de rodamientos, cuerpo de eje, mecanismos de anclaje, etc. Dichas características se introducen en un modelo multicuerpo simplificado que es capaz de representar tanto ejes de ancho variable flexibles como ejes convencionales flexibles.

    Por último se realiza un análisis de la influencia de dichas características en el comportamiento dinámico del vehículo, así como el grado de influencia de cada una de ellas. Además se proponen posibles mejoras del sistema para mejorar sus prestaciones a altas velocidades.

  • 6.
    Casanueva, Carlos
    CEIT and Tecnun, University of Navarra.
    Análisis dinámico de un eje de ferrocarril con capacidad de cambio de ancho automático2007Licentiate thesis, monograph (Other academic)
  • 7.
    Casanueva, Carlos
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Alonso, Asier
    CEIT and Tecnun, University of Navarra.
    Eziolaza, Ibon
    CAF I+D.
    Giménez, José Germán
    CAF I+D and Tecnun, University of Navarra.
    Dynamic instability of railway vehicles with flexible wheelsets and varaible gauge: Estabilidad Dinámica en Vehículos con Ejes Flexibles y Ancho Variable2011In: First European Forum on Railway Running Gears. Madrid. 7-9 June 2011, 2011Conference paper (Other academic)
  • 8.
    Casanueva, Carlos
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Railway Technology.
    Alonso, Asier
    CEIT and TECNUN, University of Navarra, Spain.
    Eziolaza, Ibon
    R&D Department, Construcciones y Auxiliar de Ferrocarriles, S.A., Spain.
    Giménez, José Germán
    TECNUN, University of Navarra and R&D Department, Construcciones y Auxiliar de Ferrocarriles, S.A., Spain.
    Simple flexible wheelset model for low-frequency instability simulations2014In: Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, ISSN 0954-4097, E-ISSN 2041-3017, Vol. 228, no 2, p. 169-181Article in journal (Refereed)
    Abstract [en]

    As a general rule, the multi-body simulation models used by railway vehicle designers consider the wheelsets to be fully rigid, thus leading to possible errors when calculating the critical speed of the vehicle under study. This article suggests a wheelset model that takes into account wheelset flexibility for the study of dynamic stability. The model is simple to implement, easily parameterised, and can be applied to both conventional and variable gauge wheelsets. The parameters corresponding to wheelset flexibility that most influence the critical speed of high-speed and variable gauge vehicles are also analysed.

  • 9.
    Casanueva, Carlos
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.
    Alonso, Asier
    Department of Applied Mechanics, CEIT, Donostia-San Sebastián, Spain.
    Giménez, José Germán
    TECNUN, University of Navarra, Donostia-San Sebastián, Spain.
    Influence of Bearing Flexibility in Rail Vehicle Dynamics2015In: The international Journal of railway technology, ISSN 2049-5358, E-ISSN 2053-602X, Vol. 4, no 1, p. 47-67Article in journal (Refereed)
    Abstract [en]

    Dynamic multibody models for railway vehicles usually assume that the stiffness of the bearings is much higher than that of the primary suspension, neglecting their effect whatsoever. This assumption might not be entirely valid for high speed vehicles, where the primary suspension is stiffer than other rail vehicles; or for more complex systems such as variable gauge wheelsets, where the whole mechanic system might have a higher than expected flexibility. In this paper, a model to obtain the stiffness of a typical configuration of railway bearings is developed and applied to both a high speed vehicle bearing set and a variable gauge wheelset bearing set. The results show that the reduction of lateral stiffness as a result of bearing flexibility can reach up to 35% of its theoretical value. This massive reduction has a major influence on the prediction of the dynamic behaviour of these vehicles, e.g. critical speed or curving performance.

  • 10.
    Casanueva, Carlos
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Alonso, Asier
    CEIT and Tecnun, University of Navarra.
    Giménez, José Germán
    CAF I+D and Tecnun, University of Navarra.
    The Influence of Bearing Flexibility on High Speed Vehicles2012In: Proceedings of the First International Conference on Railway Technology: Research, Development and Maintenance / [ed] J. Pombo, Stirlingshire, UK: Civil-Comp Press , 2012, p. Paper 25-Conference paper (Refereed)
    Abstract [en]

    Railway multibody models usually ignore the flexibility of the rolling bearings, assuming that it is much smaller than the flexibility of the primary suspension elements. However, this assumption is not necessarily valid for high speed vehicles, which have a much stiffer primary suspension. In this paper a model to obtain the stiffness parameters of a typical configuration of railway bearings is developed and applied to a high speed vehicle bearing system.

    In this paper a bearing model has been developed, which takes into account the real geometry of the bearings and races for a more precise calculation of the forces transmitted through the different contact patches.

    It has been demonstrated that the interaction of rollers and races can never be considered as Hertzian contact, as the shape of the contact area goes from ellipsoidal to trapezoidal as the load increases, including a mixed contact shape when only one of the roller end is in contact with the race. Hertzian contact implies a unique type of contact through all the loading cases, with a loss of precision in the areas where it does not behave in this way. The methodology has been applied to a bearing set used in high speed vehicles, with the following results:

    1. The stiffness matrix of the bearing set has been obtained. Individual stiffness values are highly dependent on the mounting clearance. A priori, this dependence cannot be neglected for high speed dynamic analyses.
    2. The inclusion of bearing stiffness in a high speed vehicle can affect the theoretical values of the primary suspension, i.e. reduce longitudinal stiffness up to 10% or lateral stiffness up to 32%. This effect will decrease the dynamic stability of the vehicle.
    3. It can also affect the transmission of the lateral force, displacing the lateral force position closer to the wheelset axis. This effect, which is positive for the dynamic behaviour of the vehicle, is negligible for the stiffness values of the primary suspension and the bearing set of the studied vehicle.

    Moreover, a polyvalent and adaptable bearing model has been developed that allows the calculation of various characteristics and variables. This model can be further used for other studies that need individual roller characteristics, such as contact geometry or maximum pressures in the races.

  • 11.
    Casanueva, Carlos
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Vehicle Dynamics.
    Altimira, Mireia
    KTH, School of Engineering Sciences (SCI), Mechanics. Mech. Eng. Dept., Tecnun (Univ. of Navarra).
    Course design oriented towards degree objectives in higher education2016In: EDULEARN16 Proceedings, IATED , 2016, p. 1662-1669Conference paper (Refereed)
    Abstract [en]

    The goal of engineering education is to facilitate the learning of technical knowledge and understanding, skills, and attitudes required by students to become successful engineers. In the Swedish higher education system, the qualifications for a master degree in engineering are listed in the Higher Education Ordinance. Such qualifications, also called Degree Objectives, have to be fulfilled on a programme level, that is, throughout all courses that form the programme. This requires a high level of communication and collaboration between all course responsibles and the programme coordinator. At the same time, it also restricts the freedom in the design of each individual course, as they all have fit into a 2-year-long educational puzzle. Designing courses from their conception with a view on fulfilling all the degree objectives would be more effective in terms of programme coordination. However, it poses new challenges, since it requires that all degree objectives related to skills and attitudes be fulfilled in each and every course through its learning activities. Is there a way of designing the course activities in such a way that most degree objectives are covered, while respecting the diversity in learning styles and maturity level of the students, and promoting self-regulation? We explore the possibilities of this course design concept when framed within the CDIO Initiative. We analyse the relative importance of the different Degree Objectives in Swedish Higher Education, and how these can be introduced in the Intended Learning Outcomes of each individual course while keeping in mind the personal evolution of the students at different stages of their education.

  • 12.
    Casanueva, Carlos
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Dirks, Babette
    Bombardier Transportation Sweden.
    Berg, Mats
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Bustad, Tohmmy
    Trafikverket.
    Track damage prediction for Universal Cost Model applications2017In: Proceedings of the 25th IAVSD Symposium on Dynamics of Vehicles on Roads and Tracks, CRC Press, 2017Conference paper (Other academic)
    Abstract [en]

    In the EU project Roll2Rail, a Universal Cost Model (UCM) is developed, where innovations in running gear can be analysed within a simplified Life Cycle Cost (LCC) frame- work regarding its impact in energy, noise, vehicle damage and track damage. In this paper we describe the developed methodology for track damage calculation, demonstrate a study case for a regional train, and extrapolate the differential costs of different vehicle technologies in infra- structure. The results and implementation of the damage calculation methods are discussed, and the benefits of a unified methodology for a wide range of stakeholders are presented. 

  • 13.
    Casanueva, Carlos
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Dirks, Babette
    Bombardier Transportation.
    Enblom, Roger
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Hossein Nia, Saeed
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Shazamanian Shichani, Matin
    MiW Rail Technilogy.
    Integrated simulation of damage: efficient contact modeling, wear-RCF interaction, and long-term evolution2016In: ICRI Workshop on Wear and RCF, 2016Conference paper (Other academic)
  • 14.
    Casanueva, Carlos
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Doulgerakis, Emmanouil
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Jönsson, Per-Anders
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Stichel, Sebastian
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Influence of switches and crossings on wheel profile evolution in freight vehicles2014In: Vehicle System Dynamics, ISSN 0042-3114, E-ISSN 1744-5159, Vol. 52, no SI, p. 317-337Article in journal (Refereed)
    Abstract [en]

    Wheel reprofiling costs for freight vehicles are a major issue in Sweden, reducing the profitability of freight traffic operations and therefore hindering the modal shift needed for achieving reduced emissions. In order to understand the damage modes in freight vehicles, uniform wear prediction with Archard's wear law has been studied in a two-axle timber transport wagon, and simulation results have been compared to measurements. Challenges of wheel wear prediction in freight wagons are discussed, including the influence of block brakes and switches and crossings. The latter have a major influence on the profile evolution of this case study, so specific simulations are performed and a thorough discussion is carried out.

  • 15.
    Casanueva, Carlos
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Enblom, Roger
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles. Bombardier Transportation, Swedem.
    Berg, Mats
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Comparison of wear prediction models for different contact conditions2016In: Proceedings of the 24th Symposium of the International Association for Vehicle System Dynamics (IAVSD 2015), Graz, Austria, 17-21 August 2015 / [ed] Martin Rosenberger, Manfred Plöchl, Klaus Six, and Johannes Edelmann, CRC Press, 2016, p. 871-878Conference paper (Refereed)
    Abstract [en]

     Simulation of wheel and rail wear allows to predict long term profile evolution and thus, study the consequences of wheel damage in the dynamic behaviour of the vehicle, or study future maintenance requirements. Several models have been developed which try to solve the wear issue by relating the energy dissipated in the wheel-rail contact to the worn out material, from which two can be highlighted (Tg/A and Archard) which have significant differences on contact level. Even though, the prediction of long term wheel profile evolution has been validated with these two models, which means that for regular applications they seem to have an equivalent behaviour. In this work similarities and differences between the long term wear prediction methodologies are analysed, discussing their actual limitations. Then, these differences are exploited in specific operational cases to compare their wear prediction performance.

  • 16.
    Casanueva, Carlos
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.
    Enblom, Roger
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
    Stichel, Sebastian
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
    Berg, Mats
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
    On integrated wheel and track damage prediction using vehicle-track dynamic simulations2017In: Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, ISSN 0954-4097, E-ISSN 2041-3017, Vol. 231, no 7, p. 775-785Article in journal (Refereed)
    Abstract [en]

    The renewal costs for wheels and rails are a substantial part of the costs for rolling stock operators and infrastructure managers all over the world. The causes for reprofiling or grinding are, in most cases, related to the following: (1) wheel or rail profiles with unacceptable wear, (2) appearance of rolling contact fatigue cracks in the surface, and (3) wheel flats caused by locking wheels during braking. The first two causes are related to the dynamic behavior of the vehicle-track system, and can be predicted using multibody simulations. However, there are several limitations that restrain the usefulness of these prediction techniques, such as simulation time constraints, necessary simplifications, and lack of experimental data that lead to educated assumptions. In this paper, we take the end-user perspective in order to show whether the latest developments in wheel-rail damage prediction can be integrated in a simplified framework, and subsequently used by the different stakeholders for an improved management of the different assets involved in the operation of rail vehicles.

  • 17.
    Casanueva, Carlos
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Jönsson, Per-Anders
    Tikab Strukturmekanik AB.
    Stichel, Sebastian
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    influence of switches and crossings on wheel profile evolution in freight vehicles2013In: Proceedings of the 23nd IAVSD Symposium on Dynamics of Vehicles on Roads and Tracks / [ed] Simon Iwnicki, Taylor & Francis, 2013Conference paper (Refereed)
  • 18.
    Casanueva, Carlos
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Jönsson, Per-Anders
    Tikab Strukturmekanik AB.
    Stichel, Sebastian
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Uniform Wheel Wear of a Two Axle Freight Vehicle with Friction Dampers2012In: Proceedings of the First International Conference on Railway Technology: Research, Development and Maintenance / [ed] J. Pombo, Stirlingshire, UK: Civil-Comp Press , 2012, p. Paper 93-Conference paper (Refereed)
    Abstract [en]

    Wheel reprofiling accounts for a considerable amount of the maintenance costs forfreight wagons in Sweden, and the causes can be divided mainly in three groups:wheel flats, shelling and uniform wear. In this paper the development of uniformwheel wear in a two-axle freight vehicle is studied. This wagon with Unitruckrunning gear had a major modification in the suspension elements in 2005 whichhighly reduced flange wear. The method developed at KTH for uniform wearcalculation is applied on both old and new simulation models. The influence offreight wagon specific characteristics on the wear development is also analysed, i.e.high axle load and friction damping elements.

  • 19.
    Casanueva, Carlos
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Jönsson, Per-Anders
    Tikab Strukturmekanik AB.
    Stichel, Sebastian
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Use of Archard's wear law for the calculation of uniform wheel wear of high tonnage freight vehicles2013In: Proceedings of the 1st Joint Rail Conference: JRC2013, ASME Press, 2013, p. JRC2013-2545-Conference paper (Refereed)
    Abstract [en]

    Wheel profile evolution has a large influence on track and wheelset related maintenance costs. It influences important parameters such as equivalent conicity or contact point positioning, which will affect the dynamic behavior of the vehicle, in both tangent track and curve negotiation. High axle loads in freight wagons may increase both the wheel wear and the damage caused by vehicles with both new and already worn profiles. A common profile in Europe is the S1002 profile, developed for rail inclination 1/40. In Sweden rail inclination is 1/30, so contact conditions might not be optimal. The presented work uses Archard’s wear law to analyze the profile wear evolution in a two axle freight vehicle with Unitruck running gear on the Swedish network. This wear calculation methodology has been successfully used to predict uniform wear in passenger vehicles. First, the vehicle model has been optimized in order to improve the speed of the wear simulations. Experimental measurements of wheel profiles have been performed in order to validate the simulations. The conclusion is that the wear methodology successfully used to predict uniform wheel wear in passenger vehicles cannot be directly applied for the calculation of wheel profile evolution in high tonnage freight vehicles. The influence of block brakes or switches and crossings cannot be dismissed when calculating uniform wheel wear in these cases.

  • 20.
    Casanueva, Carlos
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
    Krishna, Visakh V.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
    Jönsson, R.
    NTnet AB, Malmö, Sweden .
    Nelldal, Bo Lennart
    KTH, School of Architecture and the Built Environment (ABE), Transport Science, Transport Planning, Economics and Engineering.
    Payload optimization of articulated wagons considering train length and vehicle dynamic behaviour2016In: Civil-Comp Proceedings, ISSN 1759-3433, Vol. 110Article in journal (Refereed)
    Abstract [en]

    The Capacity4Rail EU project aims are improving the competitiveness and reliability of rail freight in order to make it more attractive for modern, more sophisticated market requirements. The work described in this paper, focuses on novel vehicle designs that can account for a higher payload per meter, both from the payload optimization and the vehicle dynamic response point of view. We analyze an articulated spine wagon composed of five car bodies and six bogies, of which four of them are shared between two car bodies. In the work package, there has been an effort to look into the implications of these very long wagons in all aspects of freight operation, and this paper focuses on two of these aspects: the gain in payload by using different configurations, and the analysis of the dynamic response of the running gear. The conclusion is that, from vehicle performance point of view, it is worth exploring the possibility of increasing payload by slightly reducing the dynamic behavior of the system, as the twelve-axle vehicle is much more flexible when it comes to modern multimodal transportation. © Civil-Comp Press, 2016.

  • 21.
    Conde Mellado, Alberto
    et al.
    CEIT and Tecnun, University of Navarra.
    Casanueva, Carlos
    CEIT and Tecnun, University of Navarra.
    Vinolas, Jordi
    CEIT and Tecnun, University of Navarra.
    Giménez, José Germán
    CAF I+D and Tecnun, University of Navarra.
    A lateral active suspension for conventional railway bogies2009In: Vehicle System Dynamics, ISSN 0042-3114, E-ISSN 1744-5159, Vol. 47, no 1, p. 1-14Article in journal (Refereed)
    Abstract [en]

    The present paper describes an active centring system for railway vehicles. The proposed solution is based on lateral pneumatic actuators placed between bogie and car body connected to the vertical secondary suspension air springs. The objective of the developed centring system is twofold: the improvement of the curving behaviour of the train and the decrease of the lateral acceleration perceived by the passenger in curve negotiation thanks to the reduction of the ‘souplesse’ coefficient. The system is described in detail in the paper. Results from simulations are included considering a bidimensional model of the vehicle, and a detailed model of the air spring and control valves. The performance in curve negotiation of a vehicle equipped with this system and a conventional one is compared. Specifically, lateral displacements of the secondary suspension, roll angle and lateral accelerations are analysed. The results show noticeable performance improvements in the vehicle curving behaviour. The proposed centring system can be implemented in a conventional bogie without special design requirements; and due to the low air consumption, additional pressurised reservoirs are not required.

  • 22.
    Dirks, Babette
    et al.
    Bombardier Transportation Sweden.
    Casanueva, Carlos
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Berg, Mats
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Bustad, Tohmmy
    Trafikverket.
    Wheel damage prediction for Universal Cost Model applications2018In: The Dynamics of Vehicles on Roads and Tracks, CRC Press, 2018, Vol. 2, p. 531-536Conference paper (Refereed)
    Abstract [en]

    In the EU project Roll2Rail, a Universal Cost Model (UCM) is developed, where innovations in running gear can be analysed within a simplified Life Cycle Cost (LCC) framework regarding its impact on energy, noise, vehicle damage and track damage. In this paper, the developed methodology for wheel damage calculation will be described. Besides, it will demonstrate different study cases for a regional train and extrapolate the differential LCC of different infrastructure parameters and vehicle technologies. Both the results and the implementation of the damage calculation methods are discussed, and the benefits of a unified methodology for a wide range of stakeholders are presented.

  • 23.
    Hossein Nia, Saeed
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Casanueva, Carlos
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Stichel, Sebastian
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Fast Wear Calculation for Wheel Profile Optimization2015In: 10th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems, Colorado Springs, August 30 - September 3, ​2015, 10th Contact Mechanics Conference , 2015Conference paper (Refereed)
  • 24.
    Hossein Nia, Saeed
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Casanueva, Carlos
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
    Stichel, Sebastian
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Prediction of RCF  and Wear Evolution of Iron-Ore LocotomotiveManuscript (preprint) (Other academic)
  • 25.
    Hossein Nia, Saeed
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Casanueva, Carlos
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Stichel, Sebastian
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Sichani, M. S.
    Prediction of rolling contact fatigue (RCF) for iron-ore locomotive wheels; comparison of an alternative contact algorithm with FASTSIM2018In: The Dynamics of Vehicles on Roads and Tracks, CRC Press/Balkema , 2018, p. 835-840Conference paper (Refereed)
    Abstract [en]

    In this article, a model to estimate the evolution of surface initiated Rolling Contact Fatigue (RCF) is developed and applied to a heavy haul locomotive. To consider the changes in the wheel profile due to wear, a methodology based on Archard’s wear calculation theory is used. The method is based on the load collective concept, which determines a set of dynamic time-domain simulations as representative for the line. For RCF calculations a shakedown based theory is applied locally, using the FaStrip algorithm to estimate the tangential stresses instead of FASTSIM. The differences between the two algorithms regarding damage prediction models are studied. The differences are due to the accumulation of the FASTSIM error in the long-term process. The simulated crack locations and their angles are compared with a five-year field study and good agreements are achieved.

  • 26.
    Hossein Nia, Saeed
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    S. Sichani, Matin
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles. KTH, School of Engineering Sciences (SCI), Centres, The KTH Railway Group.
    Casanueva, Carlos
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.
    Stichel, Sebastian
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
    Wheel life prediction model – an alternative to the FASTSIM algorithm for RCF2018In: Vehicle System Dynamics, ISSN 0042-3114, E-ISSN 1744-5159, Vol. 56, no 7, p. 1051-1071Article in journal (Refereed)
    Abstract [en]

    In this article, a wheel life prediction model considering wear and rolling contact fatigue (RCF) is developed and applied to a heavy-haul locomotive. For wear calculations, a methodology based on Archard's wear calculation theory is used. The simulated wear depth is compared with profile measurements within 100,000km. For RCF, a shakedown-based theory is applied locally, using the FaStrip algorithm to estimate the tangential stresses instead of FASTSIM. The differences between the two algorithms on damage prediction models are studied. The running distance between the two reprofiling due to RCF is estimated based on a Wohler-like relationship developed from laboratory test results from the literature and the Palmgren-Miner rule. The simulated crack locations and their angles are compared with a five-year field study. Calculations to study the effects of electro-dynamic braking, track gauge, harder wheel material and the increase of axle load on the wheel life are also carried out.

  • 27.
    Hossein Nia, Saeed
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Stichel, Sebastian
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Casanueva, Carlos
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Prediction of RCF and Wear Evolution of Iron-Ore Locomotive wheels2015In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 338-339, p. 62-72Article in journal (Refereed)
    Abstract [en]

    Locomotives for the iron ore line in northern Sweden and Norway have a short wheel life. The average running distance between two consecutive wheel turnings is around 40,000 km which makes the total life of a wheel around 400,000 km. The main reason of the short wheel life is the severe rolling contact fatigue (RCF). The train operator (LKAB) has decided to change the wheel profiles to get a better match with the rail shapes in order to decrease the creep forces leading to RCF. Two wheel profiles optimised via a genetic algorithm were proposed. They have, however, not been analysed for long term wear development. There is a risk that the optimised profiles might wear in an unfavourable way and after a while cause even higher RCF or wear than the original one. This study predicts wheel profile evolution using the uniform wear prediction tool based on Archard’s wear law. RCF evolution on the surface of the wheel profiles is also investigated. The impact of wear on polishing the wheel surface and avoiding the RCF cracks to propagate is considered via introducing a correction factor to the calculated RCF index. Traction and braking are also considered in the dynamic simulation model, where a PID control system keeps the speed of the vehicle constant by applying a torque on the loco wheels. The locomotives are also equipped with a flange lubrication system, therefore the calculations are performed both for lubricated and non-lubricated wheels. The simulation results for the wheel profiles currently in use, which are performed to validate the model and the simulation procedure, show a good agreement with the measurements. It is also concluded that the lubrication system partly does not perform as expected. Comparison between the proposed optimised profiles for their long term behaviour suggests that one of them produces less RCF and wear compared to the other one.

  • 28.
    Hossein Nia, Saeed
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Stichel, Sebastian
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design. KTH, School of Engineering Sciences (SCI), Centres, The KTH Railway Group.
    Casanueva, Carlos
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.
    Nordmark, Thomas
    STUDY OF THE LONG TERM EVOLUTION OF LOW-RCF WHEEL PROFILES FOR LKAB IRON-ORE WAGONS2015Conference paper (Refereed)
  • 29.
    Krishna, Visakh V
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
    Hossein Nia, Saeed
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Casanueva, Carlos
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Stichel, Sebastian
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    FR8RAIL Y25 running gear for high tonnage and speed2019In: Proceeedings of the International Heavy Haul Association STS Conference 2019 / [ed] P.O. Larsson-Kråik, A. Ahmadi, Narvik, 2019, p. 690-697Conference paper (Refereed)
    Abstract [en]

    The rolling stock in railway freight transport has traditionally been mainly characterised by lowcost, long lifetime of the fleet, and relatively low requirements on running behaviour. However, the sector inEurope has acknowledged that in order to be competitive there is a need to develop more advanced wagons thatenable to maximise payload and speed in different scenarios, while reducing the overall system costs, includingwheelset and track deterioration. In the Shift2Rail project FR8RAIL, a consortium of wagon manufacturers,wheelset manufacturers, and research centres has worked to develop a new generation of the widely used robustY25 freight running gear, that minimises maintenance costs both on the vehicle and the track by improving thecurving performance and hunting stability. The dynamic behaviour of the proposed solutions has been studiedwith simulations-based EN14363 tests up to 30 tons/axle, and their expected impact on wheel wear and fatiguehas also been predicted, with satisfactory results regarding both damage modes.

  • 30.
    Prevolnik, Robin
    et al.
    Alten Sweden.
    Casanueva, Carlos
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.
    Hossein Nia, Saeed
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    On estimating the risk of wheel damage for wagons with paper rolls considering various dynamic conditions2017In: Proceedings of the 11th International Heavy Haul Association Conference IHHA, 2017Conference paper (Refereed)
    Abstract [en]

    Hector Rail AB is a Swedish line haul provider for the European Rail Transport Market. On one line, Hector Rail transports large cylinder-shaped paper rolls of different sizes from Holmsund to Skövde, and compressed recycled paper shaped as cubes back to Holmsund. The wheels of their Y25 bogie wagons are experiencing surface initiated rolling contact fatigue (RCF), which is increasing the maintenance cost and sometimes interrupting the time schedule. In a collaboration with KTH Royal Institute of Technology a study of the risk of developing RCF cracks when comparing different track qualities, load cases, speeds, curves and wheel-rail friction coefficients as well as the consideration of wear is carried out. The results show the difference in surface initiated RCF when applying the different input parameters, including the location along the track where the wheels are likely to initiate RCF, as well as the location of RCF on the wheels. The model also provides the curve cases where the wheels are most likely to initiate RCF. This tool can be used for optimising and further streamlining the operation for freight traffic on any line with respect to wheel damages and planned maintenance.

  • 31.
    Stichel, Sebastian
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles. KTH, School of Engineering Sciences (SCI), Centres, The KTH Railway Group.
    Casanueva, Carlos
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.
    Berg, Mats
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
    Hossein Nia, Saeed
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Wear and RCF prediction based on improved contact mechanics modelling2018Conference paper (Other academic)
  • 32.
    Stichel, Sebastian
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Jönsson, Per-Anders
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. TIKAB Strukturmekanik AB.
    Casanueva, Carlos
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Hossein Nia, Saeed
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Modeling and simulation of freight wagon with special attention to the prediction of track damage2014In: The international Journal of railway technology, ISSN 2049-5358, E-ISSN 2053-602X, Vol. 3, no 1, p. 1-36Article in journal (Refereed)
    Abstract [en]

    This paper gives an overview of the state of the art of modelling and simulation of freight wagons. The main focus of the paper is to analyse the impact of freight wagons operation on track and wheel damage. Especially experiences of more than 15 years of modelling and simulation of a variety of freight wagons at KTH Royal Institute of Technology are summarized. Different models for the dry friction suspension elements are presented. The challenges of validation arising e.g. from the strong non-linearities and non-smoothness in vehicle models are discussed. Possibilities to use simulation results to predict wheel and track damage like wear, rolling contact fatigue and track settlement are introduced. It is concluded that it is possible to develop simulation models that give relevant results, even though it is more difficult than for passenger vehicles. The results, however, are very sensitive to small changes in the input parameters; therefore a sensitivity analysis regarding some key parameters should always be included in the validation phase of a model.

  • 33.
    Stichel, Sebastian
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
    Jönsson, Per-Anders
    Casanueva, Carlos
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
    Hossein Nia, Saeed
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
    Modelling and Simulation of Freight Wagon with Special attention to the Predication of Track Damage2014In: The international Journal of railway technology, ISSN 2049-5358, E-ISSN 2053-602XArticle in journal (Refereed)
1 - 33 of 33
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