Effect of train velocity on the amount of airborne wear particles generated from wheel–rail contacts

Lee, HyunWook; Namgung, Hyeong-Gyu; Kwon, Soon-Bark

doi:10.1016/j.wear.2018.08.023

Cited by 14 publications

(17 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From these studies, Lee found that the generation number of nanoparticles generated increased and the formation characteristics were different at different train velocities under dry and water-lubricated conditions. Furthermore, the NC of nanoparticles generated at train velocities ≤ 45 km/h was not significant 8 , 18 , 21 under dry conditions. However, nanoparticle formation has not yet been examined under either dry or water-lubricated conditions at speeds above 103 km/h, despite the typical subway-train operating speed of 70–120 km/h.…”

Section: Introductionmentioning

confidence: 84%

“…Micro and nanoparticles are mainly produced by mechanical and thermal processes, respectively 7 . AWPs are continuously generated during slip at the wheel–rail contacts 8 , 9 , which occurs during normal train operations owing to the conical shape of the wheel. AWPs are generated by both the brake system and the wheel–rail contact during mechanical braking 10 ; however, the wheel–rail contact is the only source of AWP formation during electrical braking 11 , which is the most commonly used braking method in most subway systems.…”

Section: Introductionmentioning

confidence: 99%

“…Research on the formation of AWPs at wheel–rail contacts is still in its infancy. Researchers 8 – 11 , 16 – 18 have mostly focused on identifying the conditions or parameters most conducive to AWP formation at wheel–rail contacts under dry conditions. Thus, methods for minimizing the formation of AWPs at wheel–rail contacts have rarely been studied.…”

Section: Introductionmentioning

confidence: 99%

“…The effect of train velocity on the formation characteristics of nanoparticles was examined by Lee under dry 8 , 18 , 21 and water-lubricated conditions 21 . From these studies, Lee found that the generation number of nanoparticles generated increased and the formation characteristics were different at different train velocities under dry and water-lubricated conditions.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Reducing the nanoparticles generated at the wheel–rail contact by applying tap water lubricant at subway train operational velocities

Lee

2021

Sci Rep

Self Cite

View full text Add to dashboard Cite

The formation characteristics and the reduction of nanoparticles emitted from wheel–rail contacts at subway-train velocities of 73, 90, and 113 km/h under dry and water-lubricated conditions (using tap water) were studied using a twin-disk rig. The resulting number concentration (NC) of ultrafine and fine particles increased with train velocity under both conditions. Particle generation varied with slip rate under both conditions in both the particle categories. Furthermore, the formation characteristics at 113 km/h under dry conditions showed a notable deviation from those under water-lubricated conditions in three aspects: (i) The maximum NC of ultrafine particles was higher than that of fine particles, (ii) the predominant peak diameter was in the ultrafine particles category, and (iii) the proportion of ultrafine particles was much higher than those of the fine particles. Applying water decreased the NC of ultrafine and fine particles significantly at all tested velocities (by 54–69% and 87–91%, respectively). Adding water increased the NC of particles ≤ 35 nm in diameter, possibly owing to the increase in water vapor and mineral crystals from tap water. Overall, this study provides a reference for researchers aiming to minimize nanoparticle formation at the wheel–rail contacts by applying a lubricant.

show abstract

Section: Introductionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Reducing the nanoparticles generated at the wheel–rail contact by applying tap water lubricant at subway train operational velocities

Lee

2021

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…The geometric features of wear particles vary with the working parameters (Piao et al, 2019;Piao et al, 2019). Lee et al (2018) studied the effect of train velocity on particle generation in the wheel-rail steel disc contact. The results illustrated that the particle generation increased with the increasing slip rate when the velocity was lower than 28 km/h.…”

Section: Introductionmentioning

confidence: 99%

Study on the correlation between the running-in attractor and the wear particle group

Ding

Zhou

Yuan

et al. 2019

ILT

View full text Add to dashboard Cite

Purpose The purpose of this paper is to study the correlation between the dynamic features of the running-in attractor and the wear particle group, so as to characterize the running-in attractor by means of the wear particle group. Design/methodology/approach Wear particles are collected in phased wear experiments, and their dynamic features are investigated by the equivalent mean chord length L. Then, the correlation between the equivalent mean chord length L and the correlation dimension D of the running-in attractor is studied. Findings In the wear process, the equivalent means chord length L first decreases, then remains steady, and finally increases, this process agrees with the increase, stabilization and decrease of the correlation dimension D. Therefore, the wear particle group has a dynamic nature, which characterizes the formation, stabilization, and disappearance of a running-in attractor. Consequently, the dynamic characteristics and evolution of a running-in attractor can be revealed by the wear particle group. Originality/value The intrinsic relationship between the wear particle group and the running-in attractor is proved, and this is advantageous for further revealing the dynamic features of the running-in attractor and identifying the wear states.

show abstract

Comprehensive Analysis of PM2.5 Concentrations in the Seoul Metro Underground Stations: Relationships with Indoor Sources and Outdoor Air Quality

Oh,

Park,

et al. 2024

Asia-Pac J Atmos Sci

View full text Add to dashboard Cite

Effect of train velocity on the amount of airborne wear particles generated from wheel–rail contacts

Cited by 14 publications

References 13 publications

Reducing the nanoparticles generated at the wheel–rail contact by applying tap water lubricant at subway train operational velocities

Reducing the nanoparticles generated at the wheel–rail contact by applying tap water lubricant at subway train operational velocities

Study on the correlation between the running-in attractor and the wear particle group

Comprehensive Analysis of PM2.5 Concentrations in the Seoul Metro Underground Stations: Relationships with Indoor Sources and Outdoor Air Quality

Contact Info

Product

Resources

About