Thermal analysis of sliding electrical contacts with mechanical friction in steady state conditions

Pleşca, Adrian

doi:10.1016/j.ijthermalsci.2014.05.009

Cited by 24 publications

(12 citation statements)

References 13 publications

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“…In general, intermittent high temperature may be generated in the electrical contact zone due to the variable current, which may greatly impact the tribological and electrical performances of the sliding electrical contacts [9]. Given that the coating and the substrate usually have different thermal expansion coefficients, the binding force between the two will be greatly impacted when subjected to heat treatment.…”

Section: Tribological and Electrical Properties Of Heattreated Samplesmentioning

confidence: 99%

“…Wear is one of the major factors leading to the deterioration and failure of sliding electrical connectors and the wear mechanisms are mainly attributed to abrasive and adhesive wear [7,8]. The operating temperature of sliding electrical connectors usually fluctuates over a wide range due to friction, wear, electrical current, and arc erosions [9]. Trinh et al reported that the maximum temperature may achieve ~150 °C [8].…”

Section: Introductionmentioning

confidence: 99%

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A synergetic strategy based on laser surface texturing and lubricating grease for improving the tribological and electrical properties of Ag coating under current-carrying friction

et al. 2020

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Herein, a series of Ag coatings with different micro-dimples were fabricated on copper surfaces by laser surface texturing (LST) and magnetron sputtering. Multilayer graphene lubricating grease (MGLG) was prepared using multilayer graphene as an additive. The textured Ag coatings and MGLG were characterized. Moreover, the tribological and electrical performances of the textured Ag coatings under MGLG lubrication were investigated in detail. Results demonstrated that the textured Ag coating with an appropriate dimple diameter could exhibit improved tribological and electrical properties when compared to the non-textured Ag coating under MGLG lubrication. The characterization and analysis of the worn surfaces suggest that the synergetic effect of LST and MGLG contributes to these excellent tribological and electrical properties.

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Section: Tribological and Electrical Properties Of Heattreated Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A synergetic strategy based on laser surface texturing and lubricating grease for improving the tribological and electrical properties of Ag coating under current-carrying friction

et al. 2020

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“…Several heat sources contribute to temperature distribution within a PCS. The total heat Q T includes Joule heat Q J and friction Q f , so that

Q_{J} = Q_{T} - Q_{f} = I^{2} R_{J} = I^{2} ()(, R_{V} + R_{c})

where the total equivalent resistance R J is made up of the volume resistance R V and contact resistance R c , which in turn is the sum of a shrinkage resistance R s and film resistance R f [3, 24]. The film resistance may be ignored when relative motion takes place between the pantograph and the catenary; as a result, the contact resistance R c is defined as

R_{c} ≃ R_{s} = ()(, ρ_{1} + ρ_{2}) / 4 α

where ρ 1 and ρ 2 are resistivities of the pantograph strip and contact wire, respectively, and α is the equivalent radius of the actual contact area.…”

Section: Modelling and Verificationmentioning

confidence: 99%

Multi‐physics analysis and optimisation of high‐speed train pantograph–catenary systems allowing for velocity skin effect

et al. 2020

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A pantograph–catenary system (PCS) – an essential component to supply a high‐speed train (HST) – faces a variety of new challenges due to the continuously increasing train speeds. The HST traction system receives power via an electrical contact between the pantograph strip and the high‐voltage contact wire. This electrical contact is subject to serious mechanical shocks and significant electrochemical corrosion, making the modelling of the dynamic processes complicated, especially under high‐speed and heavy‐load conditions. The damage to the PCS – which is particularly noticeable at the edges of the pantograph strip – may become severe as the speed of the train rises. Moreover, as the speed increases, the distribution of the electrical current in the strip becomes uneven due to the velocity skin effect (VSE). To assess the impact of the VSE on the performance of PCSs, a multi‐physics model has been created and is reported in this study. The model has been validated through experiments and the main aspects of its functionality – such as the VSE, friction, and air convection – have been identified and analysed at different speeds. The impact of speed on the traction current and the behaviour of thermal sources have been explored. With the increasing speed, the phenomenon of current clustering at the trailing edge of the strip becomes quite dramatic, resulting in a thermal surge in the region of the strip with high current density. To mitigate the negative impact caused by VSE in the PCSs, an improved kriging optimisation methodology has been utilised to optimise the parameters of the PCS. Recommendations regarding the optimal design of the PCS are put forward to improve the current‐carrying performance and reduce the local temperature rise in the strip.

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“…In addition, arc, vibration, wear, friction, and thermal analyzes were made. [80][81][82][83][84].…”

Section: Catenary-pantograph Interactionmentioning

confidence: 99%

Katener-Pantograf Etkileşimi İçin Elektrikli Tren Uygulama Çalışması

Parlakyıldız¹,

Gençoğlu²,

Cengiz³

2020

European Journal of Science and Technology

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Today, electric rail systems that use clean energy and are a fast and reliable means of transportation are used more because of their efficiency. The main purpose of new studies investigating pantograph catenary interaction in Electric Rail Systems is to detect malfunctions. With the spread of high-speed trains in electric rail systems, malfunctions occur in pantograph and catenary systems operating under high current and high voltage. The contact force of the pantograph-catenary system erodes the pantograph surface and arcs occur. For this reason, periodic control is mandatory in pantograph-catenary systems. In this study, new, effective, sensitive, stable, real-time applicable and contactless condition monitoring, analysis, control, and diagnostic methods were investigated for pantographcatenary systems that provide energy transmission from the electric line to the locomotive in electric trains. A literature search and study application after has been carried out for modeling a pantograph-catenary system and analysis of system parameters, instantaneous control of the contact force between the pantograph and catenary to diagnose malfunctions in the pantograph-catenary system. It has been observed that pantograph-catenary interaction is negatively affected and the quality of energy transmission decreases if the system parameters change for any reason. In pantograph-catenary systems, the importance of periodic pantograph control, which will ensure the stable and efficient operation of the system, is understood if the parameters change. Because changes in parameters cause malfunctions. Therefore, periodic control and continuous monitoring of the system is required.

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Thermal analysis of sliding electrical contacts with mechanical friction in steady state conditions

Cited by 24 publications

References 13 publications

A synergetic strategy based on laser surface texturing and lubricating grease for improving the tribological and electrical properties of Ag coating under current-carrying friction

A synergetic strategy based on laser surface texturing and lubricating grease for improving the tribological and electrical properties of Ag coating under current-carrying friction

Multi‐physics analysis and optimisation of high‐speed train pantograph–catenary systems allowing for velocity skin effect

Katener-Pantograf Etkileşimi İçin Elektrikli Tren Uygulama Çalışması

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