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MCS를 이용한 자동차 공력 성능의 신뢰성 설계에 대한 연구
구요천(Yocheon Ku),노주현(Joohyun Rho),윤수환(Suhwan Yun),김태윤(Taeyoon Kim),이동호(Dongho Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The objective of this study is the provision of the method to find the reliable ranges of the design variables where the required performances are satisfied. The reliability-based design optimization was performed to find the reliable ranges and the Monte Carlo Simulation was used to evaluate the probability of success. And the empirical model was adopted for the efficient prediction of the aerodynamic performances of an automobile. Through this study, the reliable ranges of the design variables with 2-sigma or 3-sigma could be found and there sizes were maximized for the design flexibility. The provided method is expected to improve the efficiency of the development process of a new automobile by reducing the iterations between the automobile external shape design and evaluation of the aerodynamic performances.
돌풍 장치를 적용한 고속철도 선로 유동에 대한 실험 연구
노주현(Joohyun Rho),김종용(Jongyong Kim),구요천(Yocheon Ku),윤수환(Suhwan Yun),권혁빈(Hyukbin Kwon),조동현(Donghyun Cho),이동호(Dongho Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
A series of wind tunnel testing have been performed to investigate the flow filed in the vicinity of the track induced by high-speed train. To simulate the unsteady wind gust by train, large scale subsonic wind tunnel of Korea Air Force Academy and wind gust generator with damper control system and grid array have been employed. To verify the simulation of wind gust, unsteady wind velocity history have been measured by pitot tube and 25 port rake static tube and the wind tunnel results been compared with the measurements on the Seoul-Busan high-speed line. For further examination of the flow-filed, hot-wire anemometry has also been used. From these results, the ballast-flying phenomenon was found in the simulated unsteady flow and the conditions which increase a possibility of the ballast-flying was investigated.