Bibliographies thématiques / Railway, degraded adhesion, adhesion model

Littérature scientifique sur le sujet « Railway, degraded adhesion, adhesion model »

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Publié le 10 mars 2023

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Articles de revues sur le sujet "Railway, degraded adhesion, adhesion model"

Meli, E., A. Ridolfi et A. Rindi. « An innovative degraded adhesion model for railway vehicles : development and experimental validation ». Meccanica 49, n^o 4 (5 décembre 2013) : 919–37. http://dx.doi.org/10.1007/s11012-013-9839-z.

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Meli, E., L. Pugi et A. Ridolfi. « An innovative degraded adhesion model for multibody applications in the railway field ». Multibody System Dynamics 32, n^o 2 (11 octobre 2013) : 133–57. http://dx.doi.org/10.1007/s11044-013-9400-9.

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Meli, E., et A. Ridolfi. « An innovative wheel–rail contact model for railway vehicles under degraded adhesion conditions ». Multibody System Dynamics 33, n^o 3 (7 décembre 2013) : 285–313. http://dx.doi.org/10.1007/s11044-013-9405-4.

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Allotta, B., E. Meli, A. Ridolfi et A. Rindi. « Development of an innovative wheel–rail contact model for the analysis of degraded adhesion in railway systems ». Tribology International 69 (janvier 2014) : 128–40. http://dx.doi.org/10.1016/j.triboint.2013.09.013.

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Allotta, B., R. Conti, E. Meli, L. Pugi et A. Ridolfi. « Development of a HIL railway roller rig model for the traction and braking testing activities under degraded adhesion conditions ». International Journal of Non-Linear Mechanics 57 (décembre 2013) : 50–64. http://dx.doi.org/10.1016/j.ijnonlinmec.2013.06.003.

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Zirek, Abdulkadir, et Altan Onat. « A novel anti-slip control approach for railway vehicles with traction based on adhesion estimation with swarm intelligence ». Railway Engineering Science 28, n^o 4 (24 novembre 2020) : 346–64. http://dx.doi.org/10.1007/s40534-020-00223-w.

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AbstractAnti-slip control systems are essential for railway vehicle systems with traction. In order to propose an effective anti-slip control system, adhesion information between wheel and rail can be useful. However, direct measurement or observation of adhesion condition for a railway vehicle in operation is quite demanding. Therefore, a proportional–integral controller, which operates simultaneously with a recently proposed swarm intelligence-based adhesion estimation algorithm, is proposed in this study. This approach provides determination of the adhesion optimum on the adhesion-slip curve so that a reference slip value for the controller can be determined according to the adhesion conditions between wheel and rail. To validate the methodology, a tram wheel test stand with an independently rotating wheel, which is a model of some low floor trams produced in Czechia, is considered. Results reveal that this new approach is more effective than a conventional controller without adhesion condition estimation.

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Uyulan, Çağlar, et Metin Gokasan. « Modeling, simulation and re-adhesion control of an induction motor–based railway electric traction system ». Proceedings of the Institution of Mechanical Engineers, Part I : Journal of Systems and Control Engineering 232, n^o 1 (30 septembre 2017) : 3–11. http://dx.doi.org/10.1177/0959651817732487.

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Increasing the traction force is a complex problem in the design of railway vehicles; therefore, effective traction systems and algorithms have to be developed. During the traction process, the verification of traction algorithms and control strategies are based on simulations covering all locomotive dynamics. In this article, traction model of a railway vehicle and re-adhesion control method based on simulation approach are investigated to obtain more effective results. The longitudinal dynamic of a railway vehicle having traction system, which comprises two parallel motor groups, each of which has two field-oriented induction motor connected in series, is simulated to examine time-dependent changes in motor stator currents, traction torque, adhesion and resistance forces according to a given speed reference. The interaction between the adhesion force and the slip ratio is established according to the Burckhardt adhesion model, and a modified super-twisting sliding mode slip control is implemented in a computer simulation under various contact conditions so that simulation results approve the presented control method works under the maximum adhesion force. The comparison between the classical and modified version of the proposed control strategy was made to better evaluate the performance of the control system and to better optimize the traction system.

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Bureika, Gintautas. « A MATHEMATICAL MODEL OF TRAIN CONTINUOUS MOTION UPHILL ». TRANSPORT 23, n^o 2 (30 juin 2008) : 135–37. http://dx.doi.org/10.3846/1648-4142.2008.23.135-137.

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The determination problem of adhesion coefficient of locomotives’ wheels with rails is described in this paper. The use of methods of mathematical statistics and theory of probability provides wider possibilities for determining the most acceptable (suitable) value of the adhesion coefficient. The random factors influencing on this value are analysed. The use of the adhesion coefficient values based on reliable research results could help maintain uninterrupted (continuous) traffic of heavy freight trains and increase not only the carrying capacity, but also the volume of the transported goods. The paper considers a mathematical model of steady traffic of heavy freight trains pulled by upgraded locomotives of the series 2M62M on railway line with a gradient. The research results show that the actual values of the adhesion coefficient and the total resistance are distributed according to the normal distribution law. A mode of locomotive motion largely depends on the relationship between the total train's running resistance and locomotive tractive force. Finally, basic conclusions are given.

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Li, Yun Feng, Xiao Yun Feng et Rui Kuo Liu. « Maximum Adhesion Control of Railway Based on Sliding Mode Control System ». Advanced Materials Research 383-390 (novembre 2011) : 5242–49. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.5242.

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The wheels will idle when the relative slipping speed between the wheel and rail exceeds the reference slipping speed. In order to avoid this phenomenon, the simplified model of wheel-rail traction torque transmission was established. And the adhesion coefficient and vehicle velocity are got through the disturbance observer. Then the recursive least squares method was used to forecast the slope of the adhesion-slip curve. Sliding variable structure controller was used to control the error of wheel velocity and reference velocity. From the results of simulation, this method can be effective to maintain the adhesion coefficient around the maximum. And the slipping speed approached the reference value, so the damage for wheel and rail was effectively prevented which achieved the desired effect.

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Olofsson, U. « A multi-layer model of low adhesion between railway wheel and rail ». Proceedings of the Institution of Mechanical Engineers, Part F : Journal of Rail and Rapid Transit 221, n^o 3 (mai 2007) : 385–89. http://dx.doi.org/10.1243/09544097jrrt111.

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Thèses sur le sujet "Railway, degraded adhesion, adhesion model"

Meacci, Martina. « Development and Validation of Innovative Adhesion Models for Railway Applications ». Doctoral thesis, 2020. http://hdl.handle.net/2158/1205840.

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Chapitres de livres sur le sujet "Railway, degraded adhesion, adhesion model"

Huang, Xuhui, Ciaron Hamilton, Zonglin Li, Lalita Udpa, Satish S. Udpa et Yiming Deng. « Capacitive Imaging for Adhesive Bonds and Quality Evaluation ». Dans Studies in Applied Electromagnetics and Mechanics. IOS Press, 2020. http://dx.doi.org/10.3233/saem200010.

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Defective adhesive bonds pose significant threats towards structural integrity due to reduced joint strength. While the nature of the adhesion of two solids remains poorly understood since adhesion phenomenon is relevant to so many scientific and technological areas. A concept that has been gaining our attention from the perspective of nondestructive testing is the properties discontinuity of the adhesion. Discontinued properties depend significantly on the quality of the interface that is formed between adhesive and substrate. In this research, discontinued electrical properties at the interface are considered. The simplified model is free from multidisciplinary knowledge of chemistry, fracture mechanics, mechanics of materials, rheology and other subjects. From a practical standpoint, this emphasizes the need to establish a good relationship between electrical properties of adhesive bonds and corresponding measurements. Capacitive Imaging (CI) is a technique where the dielectric property of an object is determined from external capacitance measurements. Thus, it is potentially promising since adhesive and substrate differ in terms of dielectric property. At the interface between adhesive and substrate, discontinuity of the dielectric properties causes abrupt changes in electric field spatial distribution and thus alters capacitance measurement. By simulating defects in adhesive joints regarding permittivity uncertainties. Further understanding of the cause of degraded adhesion quality can be obtained

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Actes de conférences sur le sujet "Railway, degraded adhesion, adhesion model"

Alturbeh, H., J. Stow et A. Lawton. « Low Adhesion Braking Dynamic Optimisation for Rolling Stock (LABRADOR) Simulation Model ». Dans 8th International Conference on Railway Engineering (ICRE 2018). Institution of Engineering and Technology, 2018. http://dx.doi.org/10.1049/cp.2018.0050.

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Frea, Matteo, et Luc Imbert. « Safe Deceleration Recovery in Degraded Braking Conditions ». Dans EuroBrake 2021. FISITA, 2021. http://dx.doi.org/10.46720/3308473eb2021-ibc-009.

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With new technological breakthroughs come new challenges for all the actors across that same industry, and this can be said for the Automatic Train Operation in the railway industry. This new way of operating trains increases the need for safe monitoring and management of the train’s braking performance. The future brake systems are expected to reliably and predictably perform an emergency braking therefore ensuring a high accuracy of the train’s stopping distance. To satisfy the need of the upcoming market, a new solution and method is proposed allowing to mitigate and compensate for degraded conditions, whether they are linked to environmental conditions (such as low wheel rail adhesion conditions) or failures of on-board equipment. The solution is based on the safe monitoring of the train deceleration and the safe management of the braking force allowing the new brake system to reach the targets of reliability and predictability of the emergency braking. This solution is based on research and technologies developed in the frame of the Shift2Rail program (PINTA, PINTA2 and PIVOT2 projects), where Faiveley/Wabtec is fully engaged developing a new generation of adhesion management systems. Dedicated experimentations in relevant environment have shown promising signs on the reliability of the braking distance compared to the traditional systems.

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Kuroda, S., J. Kawakita, T. Fukushima et S. Tobe. « Importance of the Adhesion of HVOF Sprayed Coatings for Aqueous Corrosion Resistance ». Dans ITSC2001, sous la direction de Christopher C. Berndt, Khiam A. Khor et Erich F. Lugscheider. ASM International, 2001. http://dx.doi.org/10.31399/asm.cp.itsc2001p1123.

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Abstract Importance of coating adhesion in a corrosive environment was studied experimentally. Tensile adhesion strength of HVOF sprayed 316L stainless steel and Hastelloy C coatings were tested in as-sprayed condition as well as after immersion in seawater. It was found that the adhesion strength of the stainless steel coatings degraded rapidly whereas that of the Hastelloy coatings remained almost intact. Specimens with an artificial defect were also immersed in seawater. The cross sectional observation after the test revealed that the corrosion at the coating-substrate interface proceeded much faster with the stainless steel coating as compared to the Ni-base alloy coating. A model experiment to simulate the galvanic corrosion of a coating-substrate couple was carried out and no significant difference in the galvanic current density was found between the two coatings when coupled with the steel substrate. The tightness of the coating-substrate interface was then tested with a fluorescent dye penetration test. The dye could penetrate the boundary between the stainless steel coating and the substrate whereas the boundary between the Ni-base alloy coating and the substrate was so tight that no penetration occurred. The size of the micro-gaps at the coating-substrate boundary was discussed from the viewpoint of classical Washburn-Ridiel theory. It was concluded that such micro-gaps between the coating and substrate must be eliminated for these barrier-type coatings to be used in corrosive environments. Heat treatment was highly effective for suppressing the preferential corrosion at the coating-substrate boundary.

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Spiryagin, Maksym, Peter Wolfs, Qing Wu, Colin Cole, Sanath Alahakoon, Yan Quan Sun, Tim McSweeney et Valentyn Spiryagin. « Rail Cleaning Process and its Influence on Locomotive Performance ». Dans 2017 Joint Rail Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/jrc2017-2222.

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The traction performance of a locomotive under real operational conditions is strongly dependent on friction conditions present at the wheel-rail interface. The tribology of the contact process changes during the locomotive running process and the conditions are not ideal due to the presence of a third body layer between wheels and rails. This leads to the complexities of the non-linear wheel-rail contact. To describe this system correctly, the real working conditions need to be known. The exact conditions are both complex and vary with location because of the potential presence of additional contamination material. The realization of high adhesion under traction or braking assumes that a locomotive produces a high slip that removes some of the third body material in the contact and this effect leads to an increase in values of friction coefficient from the leading to each subsequent following wheel on each side of the bogie. The resulting friction change can improve the tractive effort of a locomotive that is a key issue for railway operations. In this paper, the change of friction coefficients under traction are investigated by means of engineering analysis and some assumptions have been stated to generate input parameters for wheel-rail contact modelling in order to understand the influence of this rail cleaning process on locomotive dynamics. The assumptions made allow adopting a progressive increase of friction coefficient under an analytical assumption for each wheel. The multibody model of a high adhesion locomotive that includes a traction system has been developed in a specialized multibody software. The results obtained show the changes in dynamic behavior of a locomotive and indicate the influence on traction performance.

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Gómez-Bosch, Jorge, Juan Giner-Navarro et Javier Carballeira. « On the calculation of the Kalker's creep coefficients for non-elliptical contact areas ». Dans VI ECCOMAS Young Investigators Conference. València : Editorial Universitat Politècnica de València, 2021. http://dx.doi.org/10.4995/yic2021.2021.12313.

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In order to properly analyse new challenges in railway dynamics, such as corrugation or rolling noise, it is necessary to obtain an accurate solution of the tangential contact problem. Traditionally, in most railway dynamic softwares, tangential contact has been calculated based on the FASTSIM algorithm. This method provides a fairly accurate solution with reduced computational cost. However, when non-Hertzian contact conditions have to be assumed, its calculations are no longer accurate, which makes FASTSIM not useful for this purpose. Also, there exist tangential contact models which are able to obtain an accurate solution for non-Hertzian conditions, but their computational cost makes them inappropriate for dynamic calculations. Therefore, this proposed new method is developed in order to satisfy the need of a model able to obtain results under non-Hertzian conditions, without an excessive computational cost.In the present work, a new extension of the FASTSIM method for the calculation of non-elliptical contact areas is proposed. The main complexity of this method lies on the calculation of the adhesion coefficients. Originally, these coefficients are obtained from Kalker’s Linear Theory, which gives exact results for elliptical contact areas, but its accuracy lowers under non-Hertzian conditions. To obtain them, a stationary contact model which assumes infinite friction coefficient is developed. This model is obtained from the kinematics of the different configurations of the wheel and the rail, and from the constitutive relations corresponding to an infinite half-space. This model is solved numerically by a collocation method (imposing the solution over the contact area). By comparison with the results obtained with reference models, the accuracy and computational cost of the proposed model is analysed. These comparisons show that the proposed model is 50 times faster than the reference model, and the errors are under 3% in most of the carried-out analysis.

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