Comparative investigation into the friction and wear behaviours of a Cu–Ag contact wire/carbon strip and a pure copper contact wire/carbon strip at high speeds

Hu, Yi; Chen, G.X.; Zhang, S.D.; Gao, GQ; Wu, GN; Zhang, W.H.; Zhou, Zhijun

doi:10.1016/j.wear.2016.12.041

Cited by 28 publications

(11 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Cu, the major component of catenary wire, comprised 0.98 ± 1.09 µg/m 3 of PM 10 and 0.53 ± 0.97 µg/m 3 of PM 2.5 . The carbon strip–catenary wire interface undergoes wear, and a short circuit between the wire and the strip generates an arc discharge [ 54 , 55 ]; according to a previous study [ 16 ], electrical cable wear is estimated to contribute about 8.1% of PM 10 .…”

Section: Resultsmentioning

confidence: 99%

Sources and Characteristics of Particulate Matter in Subway Tunnels in Seoul, Korea

Lee

Kim

et al. 2018

IJERPH

View full text Add to dashboard Cite

Hazards related to particulate matter (PM) in subway systems necessitate improvement of the air quality. As a first step toward establishing a management strategy, we assessed the physicochemical characteristics of PM in a subway system in Seoul, South Korea. The mean mass of PM10 and PM2.5 concentrations (n = 13) were 213.7 ± 50.4 and 78.4 ± 8.8 µg/m3, with 86.0% and 85.9% of mass concentration. Chemical analysis using a thermal–optical elemental/organic carbon (EC–OC) analyzer, ion chromatography (IC), and inductively coupled plasma (ICP) spectroscopy indicated that the chemical components in the subway tunnel comprised 86.0% and 85.9% mass concentration of PM10 and PM2.5. Fe was the most abundant element in subway tunnels, accounting for higher proportions of PM, and was detected in PM with diameters >94 nm. Fe was present mostly as iron oxides, which were emitted from the wheel–rail–brake and pantograph–catenary wire interfaces. Copper particles were 96–150 nm in diameter and were likely emitted via catenary wire arc discharges. Furthermore, X-ray diffraction analysis (XRD) showed that the PM in subway tunnels was composed of calcium carbonate (CaCO3), quartz (SiO2), and iron oxides (hematite (α-Fe2O3) and maghemite-C (γ-Fe2O3)). Transmission electron microscopy images revealed that the PM in subway tunnels existed as agglomerates of iron oxide particle clusters a few nanometers in diameter, which were presumably generated at the aforementioned interfaces and subsequently attached onto other PM, enabling the growth of aggregates. Our results can help inform the management of PM sources from subway operation.

show abstract

Section: Resultsmentioning

confidence: 99%

Sources and Characteristics of Particulate Matter in Subway Tunnels in Seoul, Korea

Lee

Kim

et al. 2018

IJERPH

View full text Add to dashboard Cite

show abstract

“…Simultaneously, with increasing vehicle speed, the relative sliding speed between the carbon strip and catenary increases, which increases the frictional heat generated during mechanical wear. In addition, owing to the transverse vibration, the edges and corners of the carbon strip collide with the catenary; subsequently, the side of the carbon strip scratches off [26]. Figure 8(a) with the typical two-groove profile in Figure 9(c), it can be seen that the third mode shape is consistent with the two-groove depth profile.…”

Section: Transverse Vibrationmentioning

confidence: 67%

High-Frequency Vibration Analysis and Optimization of Irregular Wear of Pantograph Carbon Strips

Huang

Wang

et al. 2020

Shock and Vibration

View full text Add to dashboard Cite

The irregular wear of carbon current collector pantograph strips increases the railway maintenance costs and introduces safety hazards in the railway operation. This paper presents a method for analyzing the irregular wear of carbon strips with numerical dynamic analyses and modal tests. The carbon strips were studied in laboratory tests, and an equivalent numerical model for the investigation of their irregular wear and performance improvement was established. The results from the computational simulations were evaluated based on the laboratory results, and the correlation between the high-frequency vibration and irregular wear of the carbon strips was studied. The irregular wear contour of the carbon strips coincides with the high-frequency mode shape according to the experimental and numerical results. Moreover, the dynamic design for carbon strips was optimized with the validated computational model. The results suggest that the optimized schemes effectively mitigate the irregular wear of carbon strips.

show abstract

“…The effects of current and voltage on the friction between Cu-Ag-silver contact wires and pure copper contact wires were tested at high speed motion. Finally, they have found that friction and wear are the main factors in contact-wire failure [6]. It has shown the importance of friction and wear in contact wires.…”

Section: Introductionmentioning

confidence: 97%

Friction and Wear Mechanism Analysis of Polymer Flexible Cable Using a High Natural Frequency Piezoelectric Sensor

Ren

Zheng

2020

Sensors

View full text Add to dashboard Cite

The friction and wear of flexible cables are the main factors that cause electrical breakdown and insulation aging, and they greatly reduce the reliability and safety of robots. In order to enhance the reliability and safety of the robot, it is of great necessity to investigate the friction and wear mechanisms of the flexible cable. In this research, the friction and wear mechanisms have been discussed. The effects of relative speed, ambient temperature, and positive pressure on the flexible cables are considered by an orthogonal frictional movement. The cable friction force has been measured by a piezoelectric sensor with high natural frequency characteristics. The relations among friction and different factors affecting friction have also been discussed. The results show that the relative speed and the ambient temperature are the main factors affecting the friction and wear of the cable; the main form of flexible cable wear is mechanical-force chemical friction and wear. Those discoveries will greatly deepen the understanding of the friction and wear mechanisms of flexible cables, and will be beneficial to robot cable-reliability design.

show abstract

Comparative investigation into the friction and wear behaviours of a Cu–Ag contact wire/carbon strip and a pure copper contact wire/carbon strip at high speeds

Cited by 28 publications

References 22 publications

Sources and Characteristics of Particulate Matter in Subway Tunnels in Seoul, Korea

Sources and Characteristics of Particulate Matter in Subway Tunnels in Seoul, Korea

High-Frequency Vibration Analysis and Optimization of Irregular Wear of Pantograph Carbon Strips

Friction and Wear Mechanism Analysis of Polymer Flexible Cable Using a High Natural Frequency Piezoelectric Sensor

Contact Info

Product

Resources

About