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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.
이상범(S.B.Lee),임홍재(H.J.Yim),장현수(H.S.Jang),박재건(J.K.Park),권성은(S.E.Kwon) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_1
Low frequency vibration characteristics of a vehicle are mainly influenced by the stiffnesses of the beam type structures such as pillars and rockers and by the stiffnesses of the joint structures, at which several beam structures are jointed together. In this paper the method of modeling and optimization for joint stiffnesses and joint design parameters of the vehicle structure are proposed. First it is described that the method of modeling the joint structure with equivalent stiffness beam elements. To get required dynamic characteristics such as natural frequencies. section properties of the equivalent beam element are set to design variables and optimized. The study shows that joint stiffnesses and joint design parameters can be effectively determined using the proposed method.<br/> <br/>
차체 프레임의 유연성을 고려한 차량의 동하중 및 승차감 해석
이상범(S. B. Lee),이승엽(S. Y. LeeJ),이장무(M. Lee),임홍재(H. J. Yim) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Vehicle systems in general operate as three-dimensional elastic systems. However, for most computer simulations to predict dynamic characteristics vehicles are often assumed as rigid body systems. This paper investigates dynamics behaviors of vehicle systems with flexible irJmes numerically for dynamic loads and ride comfort levels. Joint reacticn forces. vertical accelerations, pitch accelerations were analyzed. and passenger ride quality were estimated for the vehicle systems with various flexible frames using the multipurpose flexible dynamic analysis code and the design tool for ride quality analysis.<br/>
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.