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DOI: https://doi.org/10.4491/eer.2018.385
Evaluation of temperature effects on brake wear particles using clustered heatmaps
Jihoon Shin1, Inhyeok Yim1, Soon-Bark Kwon2, Sechan Park3, Min-soo Kim4, and YoonKyung Cha1
1Department of Environmental Engineering, University of Seoul, Seoul 02504, Korea
2DAP Inc., 176 Cheoldobagmulgwan-ro, Uiwang-si, Gyeonggi-do 16105, Korea
3Transportation System Engineering, University of Science and Technology (UST), Uiwang-si 16105, Korea
4Urban Transit Research Team, Korea Railroad Research Institute (KRRI), Uiwang-si 16105, Korea
Corresponding Author: YoonKyung Cha ,Tel: +82-2-6490-2872 , Fax: +2-6490-2859, Email: ykcha@uos.ac.kr
Received: November 1, 2018;  Accepted: January 12, 2019.
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ABSTRACT
Temperature effects on the generation of brake wear particles from railway vehicles were generated, with a particular focus on the generation of ultrafine particles. A real scale brake dynamometer test was repeated five times under low and high initial temperatures of brake discs, respectively, to obtain generalized results. Size distributions and temporal patterns of wear particles were analyzed through visualization using clustered heatmaps. Our results indicate that high initial temperature conditions promote the generation of ultrafine particles. While particle concentration peaked within the range of fine sized particles under both low and high initial temperature, an additional peak occurred within the range of ultrafine sized particles only under high initial temperature. The timing of peak occurrence also differed between low and high initial temperature conditions. Under low initial temperature fine sized particles were generated intensively at the latter end of braking, whereas under high initial temperature both fine and ultrafine particles were generated more dispersedly along the braking period. The clustered correlation heatmap divided particle sizes into two groups, within which generation timing and concentration of particles were similar. The cut-off point between the two groups was approximately 100 nm, confirming that the governing mechanisms for the generation of fine particles and ultrafine particles are different.
Keywords: Brake Wear Particle | Clustered Correlation Heatmap | Clustered Heatmap | Railway vehicle | Temperature | Ultrafine Particle
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