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Glass Panel 연마설비의 동역학 특성 해석에 관한 연구
서종휘(Jong-Hwi Seo),장현수(Hyun-Soo Jang),박태건(Tae-Gun Park),최장수(Jang-Soo Choi),박태원(Tae- Won Park) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
In this paper, A dynamic analysis model of lapping machine which is grinding a glass panel is proposed. This analysis model is available for predicting the dynamic performance to develope the new lapping machine. Analysis results are aplied to predict the quality of glass panel after manufacturing. Finally, we also developed the only design program for a user who is lapping engineer in spot.
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.
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.
유한요소법을 이용한 냉각홴의 진동 및 간섭에 관한 연구
서종휘(Seo, Jong-Hwi),송하종(Song, Ha-Jong),박태원(Park, Tae-Won),김주용(Kim, Joo-Yong),정일호(Jung, Il-Ho) 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.9
A CFA(cooling fan assembly) is composed of a fan, motor and shroud, which is at the back of the automotive radiator. By forcing the wind to pass, the CFA controls the cooling performance of the radiator. The noise and vibration of the CFA may be primarily due to the resonance between the CFA and engine. The Interference among the fan, shroud and radiator by deformation is considered when the CFA is designed. In this paper, in order to analyze the structural vibration of the CFA for automobiles, a finite element model of the CFA is established by using a commercial FEM code. After the finite element modeling, the natural frequencies and the mode shapes are obtained from the FE analysis. The natural frequencies are obtained from the vibration test as well. Then, the results of the vibration test are compared with those of the FE analysis. The natural frequencies obtained by experiment have a great similarity to the results from FE model. We have confirmed the validity of the FE model and verify the structural safety for the resonance. The stress and displacements are obtained from FE analysis. We have confirmed the safety for the interference and failure.
서종휘(Jong-Hwi Seo),박태원(Tae-Won Park),채장수(Jang-Soo Chae),서현석(Hyun-Seok Seo) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
Many mechanical systems are over-constrained if only rigid bodies are used to model the system. One<br/> example of such system is a satellite system with solar panels. To avoid this over-constrained problem, solar<br/> panels can be modeled as flexible bodies. The CMS(Component Mode Synthesis) method is widely used to<br/> analyze the flexible multi-body system because it can considerably approximate the deformation of the<br/> flexible bodies using small number of well-selected mode. However, it is very difficult to decide the boundary<br/> condition and the selection of modes. In this paper, the methods for mode synthesis and setting the boundary<br/> condition are presented to analyze the flexible multi-body system with over-constraints. Finally, the reliability<br/> of proposed method is verified by solar panel's deployment test.
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.
파라메트릭 기법을 사용한 로봇링크 설계변경의 일괄처리 적용연구
박태원,문하경,정일호,서종휘,김혁,최용원,최재락,Park Tae Won,Moon Ha Kyung,Jung Il Ho,Seo Jong Hwi,Kim Hyuk,Choi Yong Won,Choi Jae Rak 한국시뮬레이션학회 2005 한국시뮬레이션학회 논문지 Vol.14 No.1
We developed the module of the software that robot designers can perform their work faster and more easily. The parametric modeler is founded on the virtual robot design program. The virtual robot design program is the powerful software which may be used to solve various problems of robot kinematics and dynamics. The parametric modeler in the software we developed is that all the positions of joints and links are changed automatically when the designer changes one joint or one link in the robot system. Without parametric method, robot-designers must change all the positions of connected joints and links. It might become time-consuming. However, it is very efficient for designers to use the method of batch-processing in performing design-changes of robot-links using the parametric modeler.
정일호(Il Ho Jung),김창수(Chang Su Kim),서종휘(Jong Hwi Seo),박태원(Tae Won Park),김희진(Hee Jin Kim),최재락(Jae Rak Choi),변경석(Kyng Seok Byun) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.4
This paper presents the development of the design of the robot element. Robot element design is an important part of robot design since it decides the performance and life time of the robot. It is necessary that the robot kinematics and the robot dynamics are accomplished to design the robot elements. The robot kinematics and dynamics determine the design parameters of the element. We developed a robot element design program with which a designer can design the robot element with convenience and reliability. The program is composed of motor, harmonic driver and ball-screw design. The program is founded on the virtual robot design program. The virtual robot design program is the powerful software which may be used to solve various problems of the robot kinematics and dynamics. The robot element design program may be used to calculate the design parameters of the element that are necessary to design robot element. Therefore, the designer can decide upon the available robot elements available to perform the objective of the robot. The robot element design program is expected to increase the competitiveness and efficiency of the robot industry.
정일호(Il Ho Jung),박태원(Tae Won Park),한상원(Sang Won Han),서종휘(Jong Hwi Seo),김성훈(Sung Hoon Kim) Korean Society for Precision Engineering 2004 한국정밀공학회지 Vol.21 No.8
The impulse between launch vehicle and atmosphere can generate a lot of noise and vibration during the process of launching a satellite. Structurally, the electronic equipment of a satellite consists of an aluminum case containing PCB. Each PCB has resistors and IC. Noise and vibration of the wide frequency band are transferred to the inside of fairing, subsequently creating vibration of the electronic equipment of the satellite. In this situation, random vibration can cause malfunctioning of the electronic equipment of the device. Furthermore, when the frequency of random vibration meets with natural frequency of PCB, fatigue fracture may occur in the part of solder joint. The launching environment, thus, needs to be carefully considered when designing the electronic equipment of a satellite. In general, the safety of the electronic equipment is supposed to be related to the natural frequency, shapes of mode and dynamic deflection of PCB in the electronic equipment. Structural vibration analysis of PCB and its electronic components can be performed using either FEM or vibration test. In this study, the natural frequency and dynamic deflection of PCB are measured by FEM, and the safety of the electronic components of PCB is evaluated according to the results. This study presents a unique method for finite element modeling and analysis of PCB and its electronic components. The results of FEA are verified by vibration test. The method proposed herein may be applicable to various designs ranging from the electronic equipments of a satellite to home electronics.