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Wan-Suk Yoo(유완석),Oleg Dmitrochenko,Dmitry Pogorelov 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
The current state of the absolute nodal coor-dinate formulation (ANCF) is reviewed for large-displacement and large-deformation problems in flexible multibody dynamics. This review covers most of the known implementations of different kinds of finite elements including thin and thick planar and spatial beams and plates. Physical experiments were carried out to verify simulation resulats that show the accuracy of the ANCF applied to real physical problems. And simulation results are compared with experiments having significant geometrical non-linearity. A beam, a plate, a rotating chain, and a rotating strip were compared as examples. Current and further development directions of the ANCF are also briefly outlined.
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),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.
유완석(Wan Suk Yoo),나상도(Sang Do Na),김광석(Kwang Suk Kim) 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.9
실시간 차량동역학 해석을 위해서는 효율적인 차량 모델이 필요하게 된다. 효율성을 높이기 위해 집중질량모델로 가정하면 현가장치의 특성을 고려하기 어렵게 되며, 현가장치의 특성을 모두 고려한 다물체동역학 모델에서는 효율성이 떨어진다. 그러므로 본 논문에서는 다물체동역학 모델링을 사용하되 해석의 효율성을 저하시키는 현가장치의 각종 요소들의 효과는 기구정역학 실험으로 추출된 특성그래프로 대체함으로써 효율성도 기하고자 시도하였다. 6x6 차량을 차체와 휠로 구성된 차량으로 모델을 정의 하였고, 다물체동역학 모델인 ADAMS 결과와 비교하여 실험적 모델의 유용성을 검증하였다. 그리고 검증된 실험적 차량모델을 RT-LAB 을 활용한 실시간 시뮬레이션 환경에 삽입하여, 실시간성 시뮬레이션의 가능성을 검증하였다. The paper presents an Experimental Vehicle Model (EVM), that utilizes the kinematic characteristics of suspensions from SPMD test data. The relative displacement and orientation of a wheel with respect to the body are represented as a function of the vertical displacement of the wheel. The equations of motion of the vehicle are formulated in terms of local coordinates that do not require coordinate transformation, which improves the efficiency of dynamic analysis. The EOM was modularized for each suspension model, and a 6 × 6 vehicle model was obtained by combining six suspensions. The analysis results were compared with ADAMS to verify the accuracy of the EVM. This study also verifies the feasibility of real-time simulation with the developed EVM. For a vehicle simulation for 1 ms, the real simulation time required within 20% of the prescribed time. This result shows that the EVM meets the real-time simulation requirements.