Relevant bibliographies by topics / Traction contactor

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Traction contactor'

Author: Grafiati
Published: 28 June 2021
Last updated: 17 February 2022

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Journal articles on the topic "Traction contactor"

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Kramarov, Andrey, Denis Batishchev, Irina Bolshenko, and Andrey Gummel. "Research of the Influence of a Ferromagnetic Shunt on the Characteristics of the Electromagnetic Actuator of a Low-Voltage Contactor." Известия высших учебных заведений. Электромеханика 64, no. 2 (2021): 44–49. http://dx.doi.org/10.17213/0136-3360-2021-2-44-49.

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The article presents the results of a research of the influence of a ferromagnetic shunt (FMS) on the static and dynamic characteristics of the control electromagnet of the KTP 6000 series contactor by means of computer numerical simulation in the ANSYS Electromagnetic Suite software package. A computer numerical model of an electromagnetic actuator with FMS is proposed and verified, the influence of the geometrical dimensions of the shunt on the static and dynamic characteristics of the electromagnetic actuator of a low-voltage DC contactor is investigated. Recommendations are given for the selection of the FMS dimensions in the design calcu-lation of the valve-type electromagnetic drive, which will increase the dynamic traction force of the electromagnet and reduce its response time.
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Al-Bender, Farid, and Kris De Moerlooze. "A Model of the Transient Behavior of Tractive Rolling Contacts." Advances in Tribology 2008 (2008): 1–17. http://dx.doi.org/10.1155/2008/214894.

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When an elastic body of revolution rolls tractively over another, the period from commencement of rolling until gross rolling ensues is termed the prerolling regime. The resultant tractions in this regime are characterized by rate-independent hysteresis behavior with nonlocal memory in function of the traversed displacement. This paper is dedicated to the theoretical characterization of traction during prerolling. Firstly, a theory is developed to calculate the traction field during prerolling in function of the instantaneous rolling displacement, the imposed longitudinal, lateral and spin creepages, and the elastic contact parameters. Secondly, the theory is implemented in a numerical scheme to calculate the resulting traction forces and moments on the tractive rolling of a ball. Thirdly, the basic hysteresis characteristics are systematically established by means of influence-parameters simulations using dimensionless forms of the problem parameters. The results obtained are consistent with the limiting cases available in literature and they confirm experimental prerolling hysteresis observations. Furthermore, in a second paper, this theory is validated experimentally for the case of V-grooved track.
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Rajeev, P. T., H. Murthy, and T. N. Farris. "Load History Effects on Fretting Contacts of Isotropic Materials." Journal of Engineering for Gas Turbines and Power 126, no. 2 (April 1, 2004): 385–90. http://dx.doi.org/10.1115/1.1689364.

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The load history that blade/disk contacts in jet engine attachment hardware are subject to can be very complex. Using finite element method (FEM) to track changes in the contact tractions due to changing loads can be computationally very expensive. For two-dimensional plane-strain contact problems with friction involving similar/dissimilar isotropic materials, the contact tractions can be related to the initial gap function and the slip function using coupled Cauchy singular integral equations (SIEs). The effect of load history on the contact tractions is illustrated by presenting results for an example fretting “mission.” For the case of dissimilar isotropic materials the mission results show the effect of the coupling between the shear traction and the contact pressure.
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Nishimura, T. "Contact Analysis for Collinear Multiple Cracks in Residual Stress Field." Journal of Pressure Vessel Technology 116, no. 2 (May 1, 1994): 169–74. http://dx.doi.org/10.1115/1.2929571.

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A method is proposed for analyzing stress intensity factors and crack profiles for collinear multiple cracks perpendicular to welded joints in an infinite plate. Using the basic solution of a single crack and taking unknown density of fictitious tractions, Fredholm integral equations and algebraic equations are formulated based upon traction-free conditions and crack face displacements, respectively. These equations are solved simultaneously, considering the contact effect of crack surfaces. Using the derived density of fictitious tractions, the stress intensity factors and displacements of multiple cracks are determined. Some numerical examples are analyzed.
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Rajeev, P. T., and T. N. Farris. "Numerical analysis of fretting contacts of dissimilar isotropic and anisotropic materials." Journal of Strain Analysis for Engineering Design 37, no. 6 (August 1, 2002): 503–17. http://dx.doi.org/10.1243/030932402320950125.

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A numerical method is presented to obtain the contact tractions when two dissimilar isotropic or anisotropic bodies are in partial slip contact. The solution to the governing coupled singular integral equations (SIEs) is obtained by incorporating the appropriate singular behaviour for the contact pressure and the shear traction. The edges of the contact zone and the stick zone are determined by iteration such that the constant multipliers of the singular functions vanish. For anisotropic materials the out-of-plane shear traction is assumed to be very small and hence neglected. The solution method has been successfully verified by comparing its results to solutions available in the literature and to the results obtained by the finite element method (FEM). By modifying the slip function to take into account the remote stress on the half-space, the SIE method can be used to analyse fretting contact problems. The resulting technique efficiently accounts for the effect of load history on the contact tractions and the contact and stick zone sizes. The pronounced effect that load history has on the stick zone size is illustrated.
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Liu, Tie Jun, and Yue Sheng Wang. "The Effect of Poisson’s Ratio on the Contact Traction Distribution of a Functionally Graded Coating." Advanced Materials Research 197-198 (February 2011): 1591–94. http://dx.doi.org/10.4028/www.scientific.net/amr.197-198.1591.

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This paper deals with the finite frictional contact of a functionally graded coating with considering the effect of Poisson’s ratio. We assume that a functionally graded coated half-space is indented by a rigid spherical punch and that the shear modulus of FGMs varies as exponential function. The whole contact region is divided into the central adhesion zone and the slip annulus. Within the slip annulus, the shear stress is limited by friction. By using the Hankel integral transform technique, the problem is reduced to a set of Cauchy singular integral equations. A numerical method is used to get the contact pressure and tangential tractions in the contact region for different Poisson’s ratio. The results show that the variation of Poisson’s ratio has obvious effect on both normal and tangential tractions. With the increase of ν, the peak value of the normal traction increases and that of the tangential traction decreases.
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Hills, D. A., and A. Sackfield. "Sliding Contact Between Dissimilar Elastic Cylinders." Journal of Tribology 107, no. 4 (October 1, 1985): 463–66. http://dx.doi.org/10.1115/1.3261109.

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The problem considered is contact between two dissimilar elastic cylinders, having their axes parallel and sliding in a direction normal to the axes. The traction distribution is determined, as are the resultant stresses generated in each body. It is found that the stresses well within the body are not changed greatly from a classical Hertz analysis, where coupling between the normal and shear tractions is neglected, but that there is a first order modification of surface tensile stresses.
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Munisamy, R. L., D. A. Hills, and D. Nowell. "A Numerical Analysis of an Elastically Dissimilar Three-Dimensional Sliding Contact." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 206, no. 3 (May 1992): 203–11. http://dx.doi.org/10.1243/pime_proc_1992_206_116_02.

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A numerical method is employed to find the traction distribution caused by sliding contact between a sphere and an elastically dissimilar half-space. The resulting stress field is compared with a standard Hertzian analysis where coupling between the normal and shear tractions is absent. Significant differences are found at the surface for large values of the coefficient of friction.
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Dow, T. A., R. D. Stockwell, and J. W. Kannel. "Thermal Effects in Rolling/Sliding EHD Contacts: Part 1—Experimental Measurements of Surface Pressure and Temperature." Journal of Tribology 109, no. 3 (July 1, 1987): 503–10. http://dx.doi.org/10.1115/1.3261486.

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This paper discusses the results of a series of experiments to measure the pressure and temperature distribution between a pair of elastohydrodynamically lubricated (EHD) disks. Three lubricants have been studied: a synthetic paraffinic oil (XRM-109F), a polyphenyl ether (OS-124), and a traction fluid (Santotrac 50). Pressure and temperature readings throughout the contact are presented as three-dimensional plots. Simultaneous measurements of the EHD film thickness, and the tractive force between disks under slip conditions are also included. The variables are disk load and slip at a fixed surface speed. The highest temperatures were measured with the traction fluid which recorded a temperature rise of 50 degrees C through the contact.
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Mocera, Francesco, Aurelio Somà, and Andrea Nicolini. "Grousers Effect in Tracked Vehicle Multibody Dynamics with Deformable Terrain Contact Model." Applied Sciences 10, no. 18 (September 21, 2020): 6581. http://dx.doi.org/10.3390/app10186581.

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In this work, a multibody model of a small size farming tracked vehicle is shown. Detailed models of each track were coupled with the rigid body model of the vehicle. To describe the interaction between the track and the ground in case of deformable soil, custom defined forces were applied on each link of the track model. Their definition derived from deformable soil mechanics equations implemented with a specifically designed routine within the multibody code. According to the proposed model, it is assumed that the main terrain deformation is concentrated around the vehicle tracks elements. The custom defined forces included also the effects of the track grousers which strongly affect the traction availability for the vehicle. A passive soil failure model was considered to describe the terrain behaviour subjected to the grousers action. A so developed model in a multibody code can investigate vehicle performance and limit operating conditions related to the vehicle and soil characteristics. In this work, particular attention was focused on the results in terms of traction force, slip and sinkage on different types of terrain. Tests performed in the multibody environment show how the proposed model is able to obtain tractive performance similar to equivalent analytical solutions and how the grousers improve the availability of tractive force for certain type of soil characteristics.
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Dissertations / Theses on the topic "Traction contactor"

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Pala, Lukáš. "Návrh stykače VN pro trakční účely." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442797.

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In the introduction a traction circuit is analyzed with different types of electric devices. The thesis describes power railway electric circuits, their loads and types of used contactors. Railway standards chapter summarizes requirements of standards for railway contactors. Follows literature focusing on power current switching and power switching devices design. Based on previous, a design procedure is developed for railway MV contactor in accordance with end-user and standards requirements. Thesis closes with pre-designing a railway contactor by calculating electrodynamic forces, heatflow and mechanical components.
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Arvanitaki, A. "Adhesion and traction of viscoelastic contacts." Thesis, Imperial College London, 1996. http://hdl.handle.net/10044/1/8273.

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Sibué, Jean-Romain. "Conception de systèmes d'alimentation sans contact pour la traction ferroviaire." Thesis, Grenoble, 2011. http://www.theses.fr/2011GRENT074/document.

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Les travaux présentés dans cette thèse portent sur la conception et le dimensionnement de composant magnétique dédié au transfert d'énergie sans contact pour des applications ferroviaires de type tramway. Cette famille de composant présente un comportement fortement inductif. Un convertisseur à double fréquence de résonance est utilisé pour l'alimenter et compenser l'énergie réactive du coupleur. Pour parvenir à dimensionner ce composant et son convertisseur associé, un outil d'aide au dimensionnement a été mis au point. Celui-ci est basé sur des modèles analytiques du composant magnétique et de la structure d'électronique de puissance. Une fois le dimensionnement réalisé, une étude des pertes, dans les bobinages et les circuits magnétiques, est réalisée par simulation numérique en utilisant la méthode d'homogénéisation (représentation macroscopique des éléments avec des propriétés électromagnétiques complexes). Puis, la modélisation du comportement thermique du système est présentée afin de garantir la température de fonctionnement désirée. Afin de valider l'approche de dimensionnement et les outils mis en place, des expérimentations ont été menées sur des prototypes de 1,6 et 100 kW. Les résultats obtenus ont montré la précision et la pertinence de l'approche théorique. Cette étude valide la faisabilité de ce type de système forte puissance
The works presented in this thesis deal with the design and the sizing of magnetic component dedicated to contactless energy transfer for railway application like tramway. This family of component presents a strongly inductive behavior. A double resonance converter is used to supply and compensate reactive energy of transformer. In order to design this component and its associated converter, a design tool has been implemented. This one is based on analytical models of magnetic component and power electronic converter. One time designing realized, a study of losses, in windings and in magnetic cores, is realized by numerical simulation by using homogenization method (macroscopic representation of elements with electromagnetic complex properties). Then, the establishment of a model of thermal behavior of system is presented in order to guarantee desired working temperature. In order to check designing approach and tools, experimentations have been performed on prototypes of 1.6 and 100 kW. Obtained results show the accuracy and relevance of theoretical approach. Moreover, this study confirms the feasibility of this kind of high power system
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Wikström, Victoria. "Influence of temperature and oil type on traction in lubricated contacts." Licentiate thesis, Luleå tekniska universitet, 1993. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26602.

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Liu, HaiChao [Verfasser]. "Traction prediction in rolling/sliding EHL contacts with reference fluids / HaiChao Liu." Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2020. http://d-nb.info/1222160471/34.

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Liu, Haichao [Verfasser]. "Traction prediction in rolling/sliding EHL contacts with reference fluids / HaiChao Liu." Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2020. http://d-nb.info/1222160471/34.

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Lewis, Stephen Robert. "Measurement, control and enhancement of friction/traction in a simulated wheel/rail contact." Thesis, University of Sheffield, 2011. http://etheses.whiterose.ac.uk/12868/.

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The focus on rail transportation has shifted in recent years to be a viable alternative to road based means of travel and freight distribution. With a finite stockpile of the world's natural hydrocarbon based fuels and ever increasing road congestion, rail research has become a prime topic of late. In this thesis the focus has been on the wheel/rail contact and the measurement of rail head friction. The initial project was the development of an alternative technique to measure railhead friction. Adhesion loss is a major problem on railways around the world and is common during the autumn, at times for no obvious reason. Currently there are hand-pushed Tribometers which are used by rail networks to periodically measure and record friction on their rails. These devices however, are large bulky items and due to their design can only measure friction over a relatively large distance. However, most adhesion loss problems are caused by localised phenomena. A pendulum tester was chosen as a potentially viable alternative to the Tribometer as it could measure over shorter lengths of track (i. e. 13 cm compared to 3 in as in the case of the Salient Systems Tribometer). The pendulum is also relatively small and hence is convenient to transport. After a series of laboratory and field based tests the pendulum has been shown to match very well with Tribometer and twin-disc data. Friction modifiers are commonly used on railways around the world and are promoted to have many benefits such as reduced fuel consumption, reduced wear and damage to wheels and rails and reductions in operating noise. These products have been adopted in many different countries. It was noticed in the literature that very little study had been done on how the performance of these products is affected by varying atmospheric conditions or levels of railhead contamination. Another aspect of this thesis has been the measurement of one of the leading brands of top of rail friction modifier using a pin-on-disc tester with attached atmospheric chamber. It was found that humidity and the presence of iron oxide have a far greater effect on the friction modifier than temperature. In the final two chapters a study was carried out to measure the performance of traction enhancing products. These are intended to restore traction in cases of adhesion loss from, for example, leaves on the line. It is critical that correct levels of adhesion/traction are maintained for braking and acceleration purposes. A twin-disc tester was used in this study and a technique for forming a crushed leaf layer on the discs was developed. The traction enhancers consist of sand particles of uniform size suspended in a water based gel. There were four products tested each using a different sand grain size. The first series of tests measured the performance of each product in terms of traction compared to that of a leaf layer alone. It was found that the smaller particles showed the best performance by restoring the traction to uncontaminated levels in the shortest time. The second series of tests focused on the impact these products had on wheel and rail wear and track signalling. Wear was also measured in terms of mass lost from the discs. An A. C. circuit operating at 2 kHz was used to simulate a T121 track circuit which is used in the UK as part of the signalling system. Impedance caused by each product was measured and compared to impedance levels for uncontaminated discs. It was found that the impedance of a leaf layer plus the product was lower than the impedance of the leaf layer alone. There also seemed to be no correlation between particle size and impedance. The impedance levels seen with the products were not deemed to be enough to cause a significant issue to the signalling system.
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Bader, Norbert Fritz [Verfasser]. "Traction in EHL-Contacts : the influence of local fluid rheology and temperatures / Norbert Fritz Bader." Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2018. http://d-nb.info/1179909712/34.

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Makala, Jérôme. "Modélisation d'un variateur toroidal ; études théorique et expérimentale des contacts de traction en régime élastohydrodynamique." Poitiers, 2000. http://www.theses.fr/2000POIT2257.

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Le probleme dans l'automobile de la variation continue du rapport de vitesses est un domaine tres vaste. L'interet apporte en terme de gain en consommation et de reduction des emissions polluantes fait que ce concept a largement ete etudie depuis ces dernieres annees. Ce domaine est aborde sur un variateur a traction, le variateur toroidal, et ceci aussi bien theoriquement que de facon experimentale. Pour ce type de transmission, la puissance passe par des contacts ponctuels lubrifies qui doivent transmettre des forces de frottement par la resistance au cisaillement d'un film elastohydrodynamique. Un fluide, dit de traction est utilise a cette fin, en developpant un fort coefficient de frottement a haute pression par le biais de la piezoviscosite. Les problemes poses dans ce contexte sont ceux du rendement du variateur et de son evaluation en terme de performance. Les contacts de traction sont sources d'une dissipation qui contribue a la decroissance du rendement du mecanisme, et peut conduire dans certains cas, a la rupture dans la transmission de la puissance. L'etude scientifique repose sur la modelisation theorique du mecanisme et sur la meilleure caracterisation experimentale possible du lubrifiant utilise. Afin d'approcher les conditions reelles de sollicitation du fluide dans le variateur, deux dispositifs experimentaux ont ete utilises. Le premier, une machine a galets, permet de caracteriser rheologiquement le fluide de traction. Les parametres dominant sont identifies, analyses et discutes pour determiner les conditions les plus critiques qui menent a la rupture de la traction. Le second dispositif, un simulateur experimental specifique, a ete modifie pour mesurer les epaisseurs de film par une methode interferometrique. La precision du dispositif permet de comparer les mesures aux theories existantes et d'etudier l'influence des parametres de fonctionnement sur les conditions d'alimentation. L'identification d'une loi de comportement du fluide permet alors d'etablir un modele de rendement des contacts et du mecanisme, autorisant ainsi la comparaison entre deux types d'architecture. Pour valider l'ensemble de ces travaux, deux prototypes et leurs instrumentations sont presentes.
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Ristagno, Baptiste. "Machines à commutateur mécanique pour traction automobile : modélisation et optimisation." Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0122.

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Les travaux de recherches menés dans cette thèse s'inscrivent dans un contexte d'électrification du secteur automobile en réponse aux préoccupations environnementales. Cette thèse concerne la modélisation et l'optimisation de machines à commutateur mécanique pour la motorisation électrique de petits véhicules mono- ou bi- place. Les machines à collecteur représentent une alternative crédible par leur compétitivité, leur robustesse et leur fiabilité principalement dues à l'absence d'électronique de puissance. Néanmoins, elles nécessitent des dispositifs de compensation et d'aide à la commutation dont l'absence peuvent dégrader leurs performances. L'alimentation par commutateur mécanique rend nécessaire la prise en compte de la dynamique électrique dans la modélisation numérique par éléments finis. C'est pourquoi, il est crucial de développer un modèle permettant un couplage fort au sens de la formulation variationnelle du problème magnétique, du circuit électrique externe et enfin du problème électrocinétique de circulation des courants à l'interface du commutateur. Dans ce contexte, l'utilisation d'une plateforme de modélisation ouverte ONELAB a abouti au développement d'un modèle original de projection des propriétés physiques et des sources sur un maillage fixe. Cette méthode permet de s'affranchir du remaillage lors de processus itératifs tels que l'optimisation géométrique ou encore la prise en compte du mouvement. Cette méthode a abouti au couplage dynamique du problème magnétique et du circuit électrique externe à la formulation électrocinétique de l'ensemble balais-collecteur ainsi qu'à des perspectives de simulations multi-physiques à cette interface. Enfin, le choix d'un algorithme d'optimisation adapté aux modèles numériques (boîte noire à fort coût d'évaluation) a permis de développer un outil de dimensionnement des machines à commutateur mécanique adapté à une grande variété de structures en réponse à un cahier des charges industriel
The research work carried out in this thesis is part of a context of vehicle electrification in response to environmental concerns. This thesis focuses on the modeling and optimization of commutator machines used in powertrains of small electric vehicles. This kind of machines represents an alternate solution due to their competitiveness, robustness and reliability mainly due to the absence of power electronics. Nevertheless, they require compensation windings and commutation poles to improve their performances. Commutator power supply makes it necessary to take into account electrical dynamics in numerical magnetic modeling by finite elements. That is why, it is crucial to develop a model allowing a strong coupling in the sense of the variational formulation, of magnetic problem, external electrical circuit and finally current flow problem at the commutator interface. In this context, the use of a modeling opensource platform ONELAB has led to the development of an original model that performs projection of physical properties and sources on a fixed mesh. This method avoids remeshing during iterative processes such as geometric optimization or movement modeling. This method has led to the dynamic coupling of the magnetic problem and the external electrical circuit to the current flow formulation at the commutator interface as well as to prospects for multi-physical simulations at this interface. Finally, the choice of an optimization algorithm adapted to the numerical models (black box with a high evaluation cost) allowed the development of a tool for the design of commutator machines adapted to many topologies in order to fulfill industrial requirements
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Books on the topic "Traction contactor"

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Maznev, Aleksandr, and Oleg Shatnev. Electric apparatus and circuits of rolling stock. ru: INFRA-M Academic Publishing LLC., 2020. http://dx.doi.org/10.12737/1014641.

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Provides information about technical data and design of electrical apparatus of control, monitoring and protection of traction motors of electric rolling stock (EPS), the principles of speed control of locomotives and trains with contactor-resistor and semiconductor converters based on modern element base, a circuit diagram of various types of EPS with manifold and induction motors in modes of traction and braking. For students of institutions of secondary professional education. It may be useful to students of higher educational institutions, courses of improvement of qualification, the railway workers related to the maintenance and repair of rolling stock.
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Thermal traction contact performance evaluation under fully flooded and starved conditions. Cleveland, Ohio: The Center, 1985.

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A, Tanner John, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Division., eds. Advances in contact algorithms and their application to tires. [Washington, DC]: National Aeronautics and Space Administration, Scientific and Technical Information Division, 1988.

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Book chapters on the topic "Traction contactor"

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Dowson, Duncan. "Friction and Traction in Lubricated Contacts." In Fundamentals of Friction: Macroscopic and Microscopic Processes, 325–49. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2811-7_18.

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Konyukhov, Alexander, and Karl Schweizerhof. "Contact Constraints and Constitutive Equations for Contact Tractions." In Computational Contact Mechanics, 135–84. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-31531-2_6.

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Deters, Ludger, Steffen Engel, and Matthias Proksch. "Friction and Wear of Tractive Rolling Contacts." In System Dynamics and Long-Term Behaviour of Railway Vehicles, Track and Subgrade, 191–210. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-45476-2_12.

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Dvoralai Wulfsohn, Thomas R. Way, Shrini K. Upadhyaya, and William J. Chancellor. "Chapter 2. Traction Mechanics. Part II. Soil-Tire Contact Area." In Advances in Soil Dynamics Volume 3, 59–84. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2009. http://dx.doi.org/10.13031/2013.26869.

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Kim, Hyung Kyu, Young Ho Lee, and Youn Ho Jung. "A New Approach for a Wear Depth Prediction Using Contact Tractions." In Fracture and Strength of Solids VI, 435–40. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-989-x.435.

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Thianwiboon, Mongkol, and Viboon Sangveraphunsiri. "Traction Control for a Rocker-Bogie Robot with Wheel-Ground Contact Angle Estimation." In RoboCup 2005: Robot Soccer World Cup IX, 682–90. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11780519_69.

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Iagnemma, K., and S. Dubowsky. "Vehicle Wheel-Ground Contact Angle Estimation: With Application to Mobile Robot Traction Control." In Advances in Robot Kinematics, 137–46. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4120-8_15.

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Liang, Chen, Liu Ji, Hoda Mousavi, and Corina Sandu. "Evaluation of Tire Traction Performance on Dry Surface Based on Tire-Road Contact Stress." In The 30th SIAR International Congress of Automotive and Transport Engineering, 138–52. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-32564-0_17.

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Seo, Jung Won, Hyun Mu Hur, Sung Tae Kwon, Jae Boong Choi, and Young Jin Kim. "Effects of Residual Stress and Traction Force on the Contact Fatigue Life of Railway Wheels." In Experimental Mechanics in Nano and Biotechnology, 1067–70. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-415-4.1067.

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Hills, D. A., D. Nowell, and A. Sackfield. "Plane contacts: surface tractions." In Mechanics of Elastic Contacts, 45–72. Elsevier, 1993. http://dx.doi.org/10.1016/b978-0-7506-0540-3.50005-2.

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Conference papers on the topic "Traction contactor"

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Rajeev, P. T., H. Murthy, and T. N. Farris. "Load History Effects on Fretting Contacts of Isotropic Materials." In ASME Turbo Expo 2002: Power for Land, Sea, and Air. ASMEDC, 2002. http://dx.doi.org/10.1115/gt2002-30297.

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The load history that blade/disk contacts in jet engine attachment hardware are subject to can be very complex. Using Finite Element Method (FEM) to track changes in the contact tractions due to changing loads can be computationally very expensive. For 2D plane strain contact problems with friction involving similar/dissimilar isotropic materials, the contact tractions can be related to the initial gap function and the slip function using coupled Cauchy Singular Integral Equations (SIEs). The effect of load history on the contact tractions is illustrated by presenting results for an example fretting “mission”. For the case of dissimilar isotropic materials the misson results show the effect of the coupling between the shear traction and the contact pressure.
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2

Wang, Zhan-jiang, Yuan-zhong Hu, Wen-zhong Wang, and Hui Wang. "A Numerical Solution for Fretting Contacts." In STLE/ASME 2010 International Joint Tribology Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ijtc2010-41041.

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When two surfaces in static contacts are subjected to combined loads applied in the normal and tangential directions, or just a normal load for dissimilar materials, microscopic slip would take place at certain areas of the contact region even though the contacting bodies remain still without macroscopic movement. The micro-slip is considered a major cause of fretting wear for the materials in contacts under alternating dynamic load or vibration, referred as the fretting contacts in this study. The fretting contact problem was solved using a semi-analytical method (SAM), in which analytical relations between a unite stress and corresponding surface displacement were obtained on the basis of Green functions. The contact pressure and shear tractions were then calculated by minimizing the complementary energy, and by a numerical procedure based on Conjugate Gradient Method (CGM) and Fast Fourier Transform (FFT) technique. The algorithm is very effective since the meshes are applied to the positions just in the contact areas of interest, which saves the computing time. The fretting contacts of dissimilar materials were studied and the effects of surface roughness were analyzed. Results show that the coupled effects of shear traction and material dissimilarity make the traction distributions quite different with the solutions from similar materials. The solutions under dynamic load depend on the path or history of the loading process, but the stress distributions and load-displacement curves will quickly converge to a periodic stability after several load cycles.
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3

Davidson, W. "Radiated emissions from contact shoes." In IEE Colloquium on EMC in Electric Traction and Signalling. IEE, 1995. http://dx.doi.org/10.1049/ic:19951250.

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4

Hartland, D. J. "Electric contact systems - passing power to the trains." In IET Professional Development Course on Electric Traction Systems. IET, 2010. http://dx.doi.org/10.1049/ic.2010.0187.

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5

Hartland, D. "Electric contact systems: passing power to the trains." In IET Professional Development Course on Electric Traction Systems. IEE, 2008. http://dx.doi.org/10.1049/ic:20080504.

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6

Hartland, D. J. "Electric contact systems - passing power to the trains." In IET Professional Development Course on Electric Traction Systems. Institution of Engineering and Technology, 2012. http://dx.doi.org/10.1049/ic.2012.0083.

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7

Zhang, X., W. Tobler, and Y. Zhang. "Kinematic Analysis and Modeling of Traction Drive CVT." In ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/dac-8658.

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Abstract This paper presents a systematic model for the design and analysis of toroidal traction drive continuously variable transmissions (CVT). The contacts between the input disk, the roller and the output disk of the traction drive are formulated using classical Hertzian contact theory. The traction force and side slip force occurring in CVT operation are modeled based on elasto-hydrodynamic theory and are correlated to the traction drive geometric and kinematic parameters. The model allows for the quantitative analysis of traction drive operation under specified torque inputs and over the desired ratio range.
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8

Spiryagin, Maksym, Peter Wolfs, Qing Wu, Colin Cole, Sanath Alahakoon, Yan Quan Sun, Tim McSweeney, and Valentyn Spiryagin. "Rail Cleaning Process and its Influence on Locomotive Performance." In 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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9

Hartland, D. "Electric contact systems - passing power to the trains." In 9th IET Professional Development Course on Electric Traction Systems. IEE, 2006. http://dx.doi.org/10.1049/ic:20060197.

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10

Sharif, K. J., H. P. Evans, R. W. Snidle, and J. P. Newall. "Modelling of Film Thickness and Traction in a Variable Ratio Traction Drive Rig." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/ptg-48102.

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The paper describes the application of a full non-Newtonian, thermal elastohydrodynamic lubrication (EHL) model for the prediction of film thickness and viscous traction force in a special high speed rolling traction rig. The primary objective of the work was to identify a suitable lubricant rheological model that would describe the behavior of practical EHL traction drive contacts over their operating range. Experiments were carried out on a special rolling contact rig at temperatures of 60, 90 and 120°C and contact loads giving maximum Hertzian pressures of 1, 2 and 3 GPa. Entrainment speeds of up to 18 m/s were investigated. Corresponding modelling work was carried out using lubricant physical properties obtained for the traction fluid Santotrac 50. Viscosity data for this lubricant were available from the work of Bair and Winer, but a degree of extrapolation was required to this data to cover the range of the experiments. In view of the crucial importance of viscosity/pressure behavior in the prediction of traction attention was therefore focused upon the lower contact loads for which reliable viscosity/pressure data are available. A best-fit exercise was then carried out to establish an appropriate rheological model to account for shear thinning of the lubricant. Different non-Newtonian relationships were investigated including those of Johnson and Tevaarwerk, Bair and Winer, and a model which combined the features of both of these. The most encouraging agreement between experiment and theory over the range of temperatures and speeds considered was obtained with the Johnson and Tevaarwerk (Eyring) model.
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