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운전하중하의 레인플로집계법을 이용한 화차 대차의 피로누적손상과 수명예측
전주헌(Joo Heon Jeon),백석흠(Seok Heum Baek),이경영(Kyoung Young Lee),조석수(Seok Swoo Cho),주원식(Won Sik Joo) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Endbeam is an important structural member of freight bogie for the support of service loading. In general, more than 25 years' durability is necessary. However, endbeam occur fatigue fracture in dynamic stress concentration location because comparatively strength and stiffness are low. Therefore, structure analysis is performed to evaluate structural problem of endbeam and local strain range as durability analysis. The number of cycles is extracted concerning the bogie in operation by measurement dynamic stress time history on critical part which is crack initiation in actual fact. At this time rainflow cycle counting is used to consider change of stress for operating condition. Based on the fatigue life curves and the stress analysis, the fatigue life of the endbeam is predicted and compared with the experimentally determined fatigue life, resulting in a fairly good correlation.
신뢰성 분석을 이용한 무개화차용 엔드빔의 피로수명 평가와 계획예방정비
이경영(Kyoung Young Lee),전주헌(Joo Heon Jeon),백석흠(Seok Heum Baek),조석수(Seok Swoo Cho),주원식(Won Sik Joo) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
Increased cumulative running times of railroad vehicle brings out such degradation as wear and fatigue. It don't adapt corrective maintenance which repairs a poor part after a trouble but use preventive maintenance which fixes a bad part before a trouble. There were a few researches for preventive maintenance such as inspect affairs and facilities management. They couldn't estimate the operation reliability on railroad vehicle. Therefore. this study proposes the preventive maintenance procedure that predict repair period of end beam for uncovered freight car using reliability function and instantaneous failure rate on the basis of fatigue test and load history data.