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도로하중조건을 고려한 상용차 Leaf Spring의 피로강도 평가
손일선(I.S. Sohn),배동호(B.H. Bae),정원석(W.S. Jung),정원욱(W.W. Jung),박순철(S.C. Park) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
Suspension system of vehicle is directly influenced to ride and handling. Therefore, suspension part<br/> should have enough endurance during its lifetime to protect passenger. Spring is one of major<br/> suspension part of vehicle. Thus, in this paper, a fatigue design method for leaf spring based on road<br/> load response is proposed. At first, strain and acceleration of leaf spring is measured on the proving<br/> ground. And next, the maximum load of leaf spring under driving condition was defined from the<br/> road load response. And leaf spring fatigue test and 3 point bending specimen tests were carried out.<br/> From the above, the maximum load-fatigue life relation of leaf spring was defined, and test results<br/> have good agreement between 3 point bending test result and leaf spring fatigue test. It is expect that<br/> 3 point bending test can verify leaf spring fatigue endurance as well as saving time and cost.
쇼트피닝 잔류응력이 Leaf Spring의 피로강도에 미치는 영향
배동호(B. H. Bae),손일선(I. S. Sohn),정원석(W. S. Jung),김낙수(N. S. Kim),정원욱(W. W. Jung),박순철(S. C. Park) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Spring is one of major suspension pan of vehicle. Thus, in the process of manufacturing, it is shot-peened to improve its fatigue strength. In this paper, residual stresses by shot peening were calculated through finite element analysis, and the effects of these residual stresses on fatigue strength of leaf spring were evaluated. Fatigue tests were performed with two kinds of specimens, one is actual leaf spring assembly, and another is 3-point bending specimen simply simulated. And all fatigue tests were also performed under the loading condition that was measured on the proving ground. From the results, the maximum load-fatigue life relation of leaf spring was defined, and test results have good agreement between 3 point bending specimen and leaf spring assembly. The effects of residual stresses by shot peening on fatigue strength of leaf spring is not large in the high load range, however, in the low load range, its effects were revealed a little.<br/> <br/>
과다 예압을 받는 테이퍼롤러 베어링의 수명단축효과에 대한 실험적 연구
박종원(J. W. Park),김형의(H. E. Kim),김종억(J. E. Kim),심양진(Y. J. Sim),정원욱(W. U. Jung) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Tapered roller bearings are core component for rotating machine that endure axial and radial load simultaneously. Especially tapered roller bearings used for input and output shaft of transmission the life shortening effect as excessive axial pre-load, which can be occurred in assembly line of transmission, was frequently reported in that case. In this study, we derived the equation for the life of tapered roller bearing in case of excessive pre-load by accelerated life test. DOE method and FEA was used for designing the accelerated life test condition. The derived life equation of tapered roller bearing calculated longer life than the exited L₁? bearing life equation. Because we analyzed the accelerated life test results with Weibull distribution. The result of this study will be helpful to predict the life of tapered roller bearing in case of excessive pre-load and design that kind of rotating machines.
이태희(TaeHee Lee),민병훈(B. H Min),정원욱(W. W Jung) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
There have been many fleet tests at USA, Europe, UAE, India and Korea. This study relates to especially domestic vehicle field monitoring. For the vehicle field monitoring, we have developed 7 test routes with respect to the actual customer driving conditions, and Vehicle Monitoring Unit a kind of a black box within a vehicle, which monitors the total car condition. This paper is to provide a process for vehicle field monitoring and a method of prospecting the VDS.