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유완석(Wan-suk Yoo),김정훈(Jung-hoon Kim),이순영(Soon-young Lee),박동운(Dong-woon Park) 한국자동차공학회 2003 한국자동차공학회 지부 학술대회 논문집 Vol.2003 No.5
In this paper. Koran dummy models are developed for the analysis of vehicle simulation with the MADYMO program. Until so far. the Hybrid III dummy model is most widely used for body modeling in vehicle crash, ride. and comfort simulation. Since the Hybrid III model is based on the American peoples, the results might be different when they are applied to the simulation of oriental peoples. Therefore, Korean dummy models are required for more accurate simulation and dynamic analysis.<br/> The Korean dummy models are developed by scaling the body data of the Hybrid III to the body data of Korean men and women. For the Korean body data, the national anthropometric survey of Korea in 1997 was applied. The developed Korean dummies are tested in the simulation, and the simulation results are compared to the experimental data from the real cars on highways.
유완석(Wan Suk Yoo),이정한(Jeong Han Lee) 대한기계학회 2017 大韓機械學會論文集A Vol.41 No.11
주령구는 안압지에서 출토된 14면체 주사위인데, 6개의 정사각면과 8개의 육각면으로 구성되어 있으며, 14개의 면에는 각각 다른 문구가 새겨져 있다. 본 연구에서는 이러한 14면체 주사위를 정밀하게 가공한 뒤, 실험을 통해 육각면이 나올 확률을 조사하였다. 다음으로 다물체동역학 모델링을 통하여 육각면이 나올 확률을 알아본 뒤, 마찰계수에 따라 확률이 달라지는 분석하였다. Juryeonggu is a cuboctahedral die that was used during the Silla period in ancient Korea. This cuboctahedral die consists of two different penal servitudes of 14 sides; however, its equal probability distribution enables it to be used as a die. In this paper, a precise cuboctahedral die, Juryeonggu, was manufactured, and its probability was measured through experiments. Next, the probability was verified through Multibody-dynamics (MBD) modeling and analysis, and the effect of the coefficient of friction on the probability distribution was studied.
Simulation of a Rotating Chain with an Absolute Nodal Coordinate Formulation
유완석(Wan-Suk Yoo),Oleg Dmitrochenko(Oleg Dmitrochenko),Dmitry Pogorelov(Dmitry Pogorelov) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
A physically simple but mathematically cumbrous problem of rotating heavy chain with one fixed top point is studied. Nonlinear equation of its two-dimensional shapes of relative equilibrium is obtained and solved numerically. A linear case of small displacements is analyzed in terms of Bessel functions. The qualitative and quantitative behavior of the problem is discussed with the help of bifurcation diagram. Dynamics of the two-dimensional model near the equilibrium positions is studied with the help of simulation using the absolute nodal coordinate formulation (ANCF). The equilibriums are found instable, and the reason of instability is explained using a variational principle.
유완석(Wan Suk Yoo),김태윤(Tae Yun Kim),정사무엘(Samuel Jung) 대한기계학회 2019 大韓機械學會論文集A Vol.43 No.7
17세기 뉴턴과 오일러에 의해 질점과 강체에 대한 운동방정식이 제안된 당시에는 3차원 운동방정식의 풀이가 쉽지 않아 실제적인 응용에는 한계가 있었다. 1970년대 들어와 컴퓨터가 공학에 응용되기 시작하여 동역학은 하나가 아닌 여러 개의 강체가 이루어진 시스템의 동역학인 다물체동역학으로 발전되기 시작했다. 본 연구에서는 지난 50년간의 다물체동역학의 발전 역사를 정리하면서, 앞으로의 발전방향에 대해서도 고찰하였다. The equations of motion of a rigid body were derived in the 17<SUP>th</SUP> century by Euler. The application was, however, confined to a simple problem due to the complexity of the equations of motion. Just after a computer was adopted for the engineering fields, application of dynamics was widened from one rigid body to a system of rigid bodies, i.e., multibody dynamics. In this paper, the history of multibody dynamics was reviewed, and the future of it is also carefully overviewed.