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전현규(Hyunkyu Jun),서정원(Jeongwon Seo),권석진(Seokjin Kwon),이동형(Donghyung Lee),권성태(Sungtae Kwon) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The spot weld between the side panel and the side-sil of electric multiple unit(EMU) underframe could be detached as the time go on due to the corrosion at the side panel. For this reason, it is necessary to check the structural strength of car-body considering the detachment of spot welds. For this reason, we develop a finite element model of car body of typical EMU by comparing the deflections obtained from the 3 point load test and FE analysis. And then we simulate the detachment between the side panel and side-sil by detaching the nodes in the FE model. We calculate the structural strength of car-body by 3D finite element analysis. The analysis results show that the detachment of spot weld seems to give very small affect the deformation at side-sil which is the one of very important design parameters of car-body. Base on the analysis results, we conclude that the detachment of spot weld may not deteriorate the whole strength of car-body.
김성권(SoungKwon Kim),김상호(SangHo Kim),권석진(SeokJin Kwon),이희성(Hi Sung Lee) 한국트라이볼로지학회 2011 한국윤활학회지(윤활학회지) Vol.27 No.1
Metallic sintered brake pads are often applied to mid/high speed train due to their high strength and thermal characteristics. Imbalance contact between discs and pads can greatly influence the life span, one sided wear, discs attack/crack and threat the safety of the train during operation. In this research, we analyzed pressure/temperature distribution between brake pads and disks. Analyzed data had been verified and modified to conduct further tests of flexible brake pads with small/full-scale dynamo test. Flexible brake pads were installed to high speed train to conduct further tests to identify the differences between rigid brake pads and flexible brake pads. In result, Flexible brake pads showed outstanding disk thermal stability, one sided wear, noise and wear rate than rigid brake pad.
트라이볼로지 관점에서 철도차량의 경량 제동 디스크와 라이닝의 특성 평가
김성권(SungKwon Kim),이희성(Hi Sung Lee),권석진(SeokJin Kwon),권성태(SungTae Kwon) 한국트라이볼로지학회 2011 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.27 No.2
The brake disc materials for railway vehicle have been mainly used cast-iron. The brake disc and pad should be light, resist to a thermal crack and absorb enough friction energy. In order to satisfy this requirement, aluminum alloy brake disc for railway vehicle has been newly developed. The aluminum itself has not been considered the friction material for railway vehicle. However, in the case of aluminum composite with dispersed ceramic particles, friction characteristics, resistance to wear and heat are much improved. In the present study, aluminum composite brake disc of 20% ceramic particle and three kinds of organic pads have been tested in dynamometer. The results show that Al MMC brake disc and pad have good friction coefficient and wear rate, and thermal cracks in brake disc have not been initiated. Also, the Al MMC brake disc can be applied to railway vehicle of 150 ㎞/h.