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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.
강성도 설계인자 기여도 분석을 통한 차체 결합부의 최적설계
이상범(S.B.Lee),임홍재(H.J.Yim),권성은(S.E.Kwon),박재건(J.K.Park) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
The joint stiffnesses must be determined in the early design stage of the vehicle structure. The joints of vehicle structure consist of several sheet. panels with spot welding. The stiffnesses of joints are characterized by section geometric shape. thickness. etc. In this paper joint stiffness variations according to the design change of reinforcement size. flange width, and flange roundness are studied. Optimal design techniques for obtaining the required stiffnesses of the joint structure is presented.<br/>
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/>
한국야초의 재배에 관한 연구 ( 제2보 성분분석에 관한 시험 )
이상범 ( S B Lee ),이종원 ( J W Lee ),이영상 ( Y S Lee ) 한국축산학회 1971 한국축산학회지 Vol.13 No.4
This study was conducted to find general composition of native herbage plants in relation to the growing stages and cultural conditions with some widely distributed native herbage plants and imparted grass and clover. Crude protein content was, in general, the highest at the early growing stage and was gradually decreased as the growing stages progressed. Cellulose and dry matter content, in the other hand, were the lowest at the early growing stage and were increased as the maturity of herbage plants progressed. Application of fertilizer increased the content of crude protein and fat, and lowered the content of fiber when compared to those of non-fertilized plots. No clear evidence was shown with other chemical contents.