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유승원(Yoo Seungwon),민옥기(Min Oak-key),박춘수(Park Choonsoo),정흥채(Chung Heungchai) 한국철도학회 2000 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper describes the analysis of aerodynamics and the prediction of airflow induced noise around simplified pantograph. First, computational fluid dynamics (CFD) is conducted for several model to evaluate linear/nonlinear flow field characteristics due to high speed flow and the CFD results support the computational aeroacoustics. The accurate prediction of the aeroacoustic analysis is necessary for designers to control and reduce the airflow induced noise. We adopt the acoustic analogy based on Ffowcs Williams-Hawkings (FW-H) equation and predict aeroacoustic noise.
U 볼트 체결력을 고려한 Leaf Spring의 피로강도 평가
유승원(Seungwon Yoo),박종찬(Jongchan Park) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Suspension system of vehicle is very important because it has an effect on ride comfort and safety. And the leaf spring is one of the major parts of commercial vehicle. By that reason it has to be designed to operate under severe condition to ensure enough endurance. But the traditional method for fatigue design needs repeated fatigue tests for each design according to its geometry, material, and operating condition. This means that a lot of time and money is needed for those tests. Thus, in this paper, a fatigue design method for leaf spring based on numerical analysis is proposed. At first, stress analysis is performed to get the stress under operation load or rig tests. And fatigue analysis is performed to get the fatigue life and to ensure the safety of leaf spring. Through this study, design parameters that play vital role in fatigue life of the leaf spring can be found out.
유승원(Seungwon Yoo),박종찬(Jongchan Park),이윤규(Yun Que Lee),이상규(SangKyu Lee) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The transportation industry vehicles made of steel often have common problems which it can be feasible to solve using other materials or byimproving the design, depending on the nature of the problem. In this study, material properties for roof structure using composite material are obtained by test and optimization for roof structure and joint structure is performed using DFSS method. With the optimized roof structure design, new composite roof structure is made with composite materials. By comparing the simulation results and test results, we get the reliable results. By using composite materials we get lighter roof structure and this technique will be applied to other components
유승원(Seungwon Yoo),주구상(Goosang Joo) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Tail gate Torsion Stiffness is important factor for Tail gate Side NVH, Open&Close Efficiency, Durability. Generally It is Easy Solution to Add Reinf in Tail gate for Stiffness Improving. But Added Reinf will Increase Car Body Weight. In This Paper, by Adopting ㅈ-Type INR PNL Frame Structure, Suggest Improving Tail Gate Torsion Stiffness Unless Sacrifing Tail gate Weight.
김기홍(Kihong Kim),유승원(Seungwon Yoo),강현민(Hyun M. Kang),차상균(Sang K. Cha) 한국정보과학회 1999 한국정보과학회 학술발표논문집 Vol.26 No.2Ⅰ
주행 경로 안내는 최근 국내에서도 활발히 연구되고 있는 지능형 교통 시스템(ITS)의 주요 기능 중 하나이다. 주행 경로 안내를 위해서는 대규모 도로망에서 신속하게 경로를 찾는 방법과 찾은 경로를 음성 또는 기호로 운전자에게 효율적으로 안내하는 방법 등이 필요하다. 본 논문에서는 도로망의 계층성을 휴리스틱 정보로 활용하여 최단시간 경로를 효율적으로 찾는 방법을 제안한다. 제안된 방법은 고속국도, 국도 등의 고속 주행용 도로만으로 소규모 상위 계층 도로망을 만들고 이를 기존 도로망에 덧붙이는 방식으로 통합한다. 이 통합망에 상위 계층 도로망을 우선적으로 찾도록 구성한 A* 알고리즘을 수행하여 최단시간 경로를 찾는다. 또 경로 탐색용 그래프가 디스크에 저장된 경우에, 디스크 접근을 최적화하기 위한 데이터베이스 설계 및 디스크 접근 방법을 기술한다. 제안된 방법의 효율성을 검증하기 위해 서울시 도로망 데이터를 이용하여 실험한 결과, 제안된 방법을 통해 경로 탐색 소요 시간, 디스크 입출력 회수, 메모리 사용량 등을 75% 이상 줄일 수 있었다.
NVH와 내구성능을 고려한 엔진마운팅 목표전개기법 최적 컨셉설계
장용석(YongSok Jang),유승원(SeungWon Yoo),장홍석(HongSuk Chang),박종찬(Jong Chan Park) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
Rubbers of vehicle engine mounting are attached at the engine that contributes the biggest vibrating energy. To design the engine mounting, NVH and durability performances are important, but those mostly conflict with each other. To solve this challenging task, Analytical Target Cascading optimization algorithm was used. Engine mtg. system was divided to dynamic solution and durability solution. To connect these two functional differences, rubbers’ stiffness was calculated individually from dynamic solver and FEM solver. And then the Analytical Target Cascading optimized the engine mtg. reducing the difference between them. To avoid abandonment due to late solution, Meta modeling was derived from design of experiment analysis. As a result, the optimized design became to satisfy both NVH and durability performance target.