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오광근 ( K K Oh ),김재훈 ( J H Kim ),김연욱 ( Y W Kim ),박정렬 ( J Y Park ),양규상 ( G S Yang ),박종원 ( J W Park ),김성현 ( S H Kim ) 한국안전학회(구 한국산업안전학회) 2014 한국안전학회지 Vol.29 No.6
Vibro ripper worked by high frequency vibration is developed to do rock fragmentation and work of ripper is the different concept with other existing breakers. The gear box-shank welded joint of vibro ripper is very important part to deliver vibro motive force to tooth, so this part should endure high frequency vibration environments. The purposes of this study are to choose the optimal welding conditions for fatigue strength. The conditions were made using three kind of shank materials and two kind of filler metals. Shank materials are Hadox-hituf, Posten80 and AR400, and filler metals are CSF-71T and CSF-81T. The fatigue test was conducted each condition. Fracture surface was observed to estimate fracture characteristics of welded joint using SEM.
김동현(D. H. Kim),박원희(W. H. Park),장용준(J. Y. Jang),이한수(H. S. Lee),유홍선(H. S. Ryou),강중구(J. G. Kang),박정렬(J. Y. Park) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
The Korea Railroad Research Institute developed a fire control system for coaches using water mist. The fire control technology using water mist is used in the fire control system embedded in coaches developed through research. Such environment-friendly, automatic fire-extinguishing device is also economical because the amount used is significantly less than that of the existing sprinkler system. The paper introduces the developed fire control system and fire control performance tests using such system.