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LOAD LIFE법을 이용한 비조질강 WHEEL HUB 피로 수명 예측
박노식(N.S.Park),이상범(S.B.Lee) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
in this study, Service Fatigue Life Analysis using Load-Life method is discussed. This method allows desigh optimization of wheel hub which require infinite life and reliablity, and safety taken into considered. Fatigue life depends on road load and material property and design such as notch. in this paper, Service fatigue life predicted according to road pattern with constant amplitude Load-Life curve. Fatigue test result obtained with redesigned hub made of microalloyed steel S45CVR and hot forged S53C steel hub.
접촉상태에 있는 3D SPRAG TYPE의 초정밀 역전방지클러치의 내구성 평가에 관한 연구
이상범(S. B. Lee),서정세(J. S. Suh),이석순(S. S. Lee),이태선(T. S. Lee),최중환(J. H. Choi) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
Recently, a dangerous event occurred at the field industry and mechanical system. At developed by SUNGGOK corp. a R-L clutches of a small and high capacity serves safety device from a variety environment of mechanical system, it permits transmission of driving torque form input to output shaft in both directions of rotation, but restrains any feedback torque of the driven load from rotating the output shaft in either direction. This study was carried out to demonstrate through finite element methode and durability estimation for safety of the R-L clutches without sliding during the engagement process. As results, we organized about endurance test methode when applied rated torque.
한국야초의 재배에 관한 연구 ( 제1보 재배에 관한 시험 )
이상범 ( S B Lee ),이종원 ( J W Lee ),이영상 ( Y S Lee ) 한국축산학회 1971 한국축산학회지 Vol.13 No.3
Studies on the growth characteristics, production and harvesting dates of native herbage plants, including five grasses and two legumes were carried out in 1970. The results obtained are as follows; 1. Of the species tested, the highest total green yield was obtained from barnyard millet and ladino clover(6,525 and 5,272㎏/10a), Digitalia sanguinalis and Arundinella hirta yielded 5,260㎏ and 3,921㎏ per 10 a. 2. Application of fertilizers showed a favourable effect to increase tire green yield of native herbage plants, 408 percent of green yield was obtained on the plot received fertilizers. Under low fertility condition, native herbage plants showed less response in decreasing growth rate compared with pasture plants. It was observed that barnyard millet and Lespedeza striata gave 470% and 229% of increasing green yield when fertilizers were applied. 3. From the results of experiments, it was indicated that annual grasses, Digitalis sanguinalis and barnyard millet could cut three times during the growing season, perennial grasses, Arundinella hirta, Miscanthus sinensis and Caramagrosfis arundinacea, twice, and annual legumes, Lespedeza striata and Cassia nomame, once. 4. According to the growth characteristics, it might be possible that cattle could be grazed on Lespedeza striata and Cassia nomame grasses from August to September, Digitalis sanguinalis and Barnyard millet, from June to September, and ladino clover, from may to October.