http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
다물체 시스템이 이동하는 유연한 케이블의 동역학 해석에 관한 연구
서종휘,정일호,한형석,박태원 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.2
In this paper, the dynamic behavior of a very flexible cable due to moving multibody system along its length is presented. The very deformable motion of a cable is presented using absolute nodal coordinate formulation, which is based on the finite element procedures and the general continuum mechanics theory to represent the elastic forces. Formulation for the sliding joint between a very flexible beam and a rigid body is derived. In order to formulate the constraint equations of this joint, a non-generalized coordinate, which has no inertia or forces associated with this coordinate, is used. The modeling of this sliding joint is very important to many mechanical applications such as the ski lifts. cable cars, and pulley systems. A multibody system moves along an elastic cable using this sliding joint. A numerical example is shownusing the developed analysis program for flexible multibody systems that include a large deformable cable.
Analysis and design study of LCD transfer robot using dynamic simulation and experiment
서종휘,황재철,최용원,임홍재 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.4
Recently, the size of raw glass has been greatly increased in the new generation Liquid Crystal Display (LCD) technology. To handle bigger and heavier glasses, it is necessary to develop a large scale LTR (LCD Transfer Robot) to support various complicated LCD fabrication processes. This adjustment will result in difficult design problems such as vibration, handling accuracy deterioration, and high stress due to heavier dynamic loads. In turn, these will result in inaccurate transfer motion and fatigue cracks. In this paper, the dynamic simulation technique is introduced to validate a baseline design and to propose new and improved designs for the best performance of heavy-scaled LCD transfer robots. The dynamic models and analysis results were verified by real experiments including strain measure test and motor power test. Using the verified simulation model, some dynamic situations such as the robot’s emergency stop and free fall situation, which were not impossible to test using the real proto robot, were analyzed and predicted using the simulation model.
금속 산화물 복합체의 광열 효과와 빛에 의해 제어 가능한 마이크로 로봇의 제조 및 응용
서종휘,이지목,이우화,고원건,김용석 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
광열 효과에 관한 연구는 빛에너지를 열에너지로 전환하여 사용할 수 있다는 장점이 있으며, 이를 운동 에너지 등으로 전환하여 사용할 수 있으므로, 친환경 에너지에 대한 인식이 높아지면서 더욱 활발히 연구되고 있다. 기존, 황과 p-diiodobenzene 을 이용하여 중합한 폴리페닐렌 폴리 설파이드 가교 고분자(PSNs)는 이미 발표된 바와 같이 근적외선 파장에서 뛰어난 광열 효과를 보였다. 본 연구에서는, 금속 산화물 등과 혼합하여 PSN 의 광열 효과를 더욱 향상 시켰으며, 이를 필름 혹은 3D 프린터를 이용하여 구조체를 만들고, 다양한 파장의 빛을 이용, 샘플의 마랑고니 효과로 인해 자유로운 움직임을 보여줄 수 있었다. DSC 측정을 통해 황 함량에 따른 유리전이 온도의 확인, 빛을 조사하여 시간에 따른 온도의 변화와 UV-Vis-NIR 측정을 통해 빛의 투과율 및 이에 따른 흡수율을 계산할 수 있으며, 빛의 파장 및 세기에 따른 이동 거리 등 다양한 특성들을 분석할 수 있었다.
설계자를 위한 에스컬레이터 전용 시뮬레이션 프로그램 개발
서종휘 한국시뮬레이션학회 1999 한국시뮬레이션학회 논문지 Vol.8 No.3
When an escalator is developed or modified to improve its performance, estimation of dynamic characteristics of the escalator is required. But modeling of the escalator for a design purpose is very difficult and time consuming. Especially, it is very difficult for a designer to use the simulation model during design process because preparing a proper model takes time and also the designer needs to know how to use the simulation program. In order to solver these problems, a graphic user interface program that can predict dynamic characteristics of an escalator is developed for the designer. Since this program makes the necessary escalator model for simulation for itself, the designer does not need to know how to use the simulation program while design is in progress. In this paper, a designer oriented interface program is developed and an example is presented to show the effectiveness of the developed program.
서종휘(Jong-Hwi Seo),정일호(Il-Ho Jung),박태원(Tae-Won Park),목진용(Jin-Yong Mok),김영국(Young-Guk Kim),김석원(Seok-Won Kim) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.1
The dynamic properties between catenary and pantograph of high-speed train are very important factors to affect the stable electric power supply. So as to design the reliable current collection system, a multibody simulation model is needed. In this paper, the dynamic analysis method for a pantograph-catenary cable system of high-speed train is presented. The very deformable motion of a catenary cable is demonstrated using nonlinear continuous beam theory, which is based on an absolute nodal coordinate formulation, and the pantograph is modeled as a rigid multibody. The proposed method might be very efficient, because this method can present the nonlinear properties of a flexible catenary cable and set a various boundary conditions.
서종휘(Jong Hwi Seo),김창수(Chang Su Kim),정일호(Il Ho Jung),박태원(Tae Won Park),김혁(Hyk Kim),최재락(Jae Rak Choi),변경석(Kyng Seok Byun) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.5
This paper presents the development of a virtual robot design program. Robot design requires numerical software, robot solution software and multi-body dynamics software to complete several designs. However using a commercialized software implies some disadvantages, such as the waste of time and money it costs to learn how to use the software. We developed a virtual robot design program with which a user can design a robot with rapidity and reliability. The virtual robot design program is composed of robot kinematics module and robot dynamics module. The program is powerful software which may be used to solve various problems of a robot. The 3D animator and a 2D/3D graph of the program can analyze the design results into visual data. The virtual robot design program is expected to increase the competitiveness and efficiency of the robot industry.
절대절점좌표를 이용한 탄성 다물체동역학 해석에서의 동응력 이력 계산에 관한 연구
서종휘(Jong-Hwi Seo),정일호(Il-Ho Jung),박태원(Tae-Won Park) Korean Society for Precision Engineering 2004 한국정밀공학회지 Vol.21 No.5
Recently, the finite element absolute nodal coordinate formulation (ANCF) was developed for the large deformation analysis of flexible bodies in multi-body dynamics. This formulation is based on the finite element procedures and the general continuum mechanics theory to represent the elastic forces. In this paper, a computation method of dynamic stress in flexible multi-body dynamics using absolute nodal coordinate formulation is proposed. Numerical examples, based on an Euler-Bernoulli beam theory, are shown to verify the efficiency of the proposed method. This method can be applied for predicting the fatigue life of a mechanical system. Moreover, this study demonstrates that structural and multi-body dynamic models can be unified in one numerical system.