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김재용(J. Y. Kim),배대성(D. S. Bae),한창수(C. S. Han),이상호(S. H. Lee) 한국자동차공학회 1994 한국 자동차공학회논문집 Vol.2 No.4
Basic constraint equations derived from orthogonality conditions between a pair of body-fixed vectors and a body-fixed vector or a vector between two bodies are reformulated by using relative coordinate kinematics between two adjacent reference frames. Arithmetic numbers of operations required to compute derivatives of the constraint equations are drastically reduced. A mixed formulation of relative and cartesian coordinates is developed to further simplify derivatives of the constraints. Advantages and disadvantages of the new formulation are discussed. Possible singularity problem of para llelism constraints is resolved by introducing an extra generalized coordinate. Kinematic analysis of a McPherson strut suspension system are carried out to illustrate use and efficiency of the new formulation<br/>
국부좌굴에 영향을 미치는 셀 구조물의 기하학적 불균일성에 대한 평가
김재용(J-Y Kim),윤경호(K-H Yoon),송기남(K-N Song) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The nuclear fuel assembly is consisted of one top/bottom nozzle, about 240 fuel rods, and approximately 10 spacer girds in the case of 16 by 16. The spacer grid plays important function of preventing impact failure by seismic and LOCA blowdown forces and supporting the fuel rods vertically. There are many mechanical and structural performance tests for spacer grid such as the performance of the grid spring, fuel rod vibration, fretting wear resistance, and the impact strength. A pendulum impact tester has been used to evaluate the impact characteristics such as impact velocity, critical strength and duration time. In the grid structure, there are two types of cell, one is fuel rod cell and the other is guide tube cell. In the impact test, the local buckling usually occurred around guide tube cell. Therefore, the effect of geometrical non-uniformity of the guide tube cell for local buckling has been investigated by considering guide tube cell configuration using the commercial FE code.
김재용(J-Y Kim),윤경호(K-H Yoon),송기남(K-N Song),이강희(K-H Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
The spacer grid plays important function of preventing lateral impact force by seismic and LOCA blowdown and maintaining the fuel rod space under accidental and operational loading conditions. There are many mechanical and structural performance tests for spacer grid(SG) such as spring characterization test, fuel rod vibration test, fretting wear test and impact test, etc. In KAERI, a pendulum type impact test has been used to evaluate the impact characteristics such as impact velocity, critical strength and duration time. The real impact test for one specimen has usually been carried out using many different angle values, so repeated loading analysis has been conducted with changing initial velocities. In this study, the lateral impact analysis of 2by2 type partial SG rather than 16by16 type is performed to establish the method of repeated impact analysis and to compare with the single impact analysis results. The repeated analysis model will be extended to big size of SG.
선용접방법으로 제작된 16×16 최적화 H형 스프링 지지격자에 대한 진자식충격시험
김재용(J-Y Kim),윤경호(K-H Yoon),송기남(K-N Song) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The General roles of a spacer grid(SG) are providing a lateral and vertical support for fuel rods, promoting a mixing of coolant and keeping guide tubes straight so as not to impede a control rod insertion under any normal or accidental conditions. To evaluate the impact characteristics of a SG such as impact velocity, critical buckling strength and duration time, a few types of impact tests for SGs have been conducted. In a previous study, a new welding method, a through-welding method, was proposed to increase critical buckling strength of a SG without any design change or material change and was verified by impact tests with 1×7 partial SG specimens. In this paper, the effect of through-welding method in case of a 16×16 full-size SG is investigated by pendulum impact tests with 16×16 SG specimens. And the increase of critical buckling strength for full-size SGs is measured by comparison with impact results of spot-welded and through-welded SGs.
김영훈(Y. H. Kim),김민수(M. S. Kim),최동훈(D. H. Choi),유홍희(H. H. Yoo),김종수(J. S. Kim),김재용(J. Y. Kim),서문석(M. S. Suh) 한국자동차공학회 1995 한국 자동차공학회논문집 Vol.3 No.2
In this study a tracked vehicle is idealized as a 2-dimensional 9-degrees-of-freedom model which takes into account the effects of HSU units, torsion bars, and track. For the model equations of motion are derived using Kane's method. By using the equations of motion, a numerical example is solved and results are compared to those obtained by using a general purpose multibody dyriamic analysis program. The comparison study shows the reasonable coherence between the two results, which confirms the effectiveness of the model. With the model, dynamic response optimization is carried out. The objective function is the peak value of the vertical acceleration of the vehicle at the driver's seat, and the constraints are the wheel travel limits, the ground clearance, and the limits of other design variables. Three different sets of design variables are chosen and used for the optimization. The results show the attenuation of the acceleration peak value. Thus the procedure presented in this study can be utilized for the design improvement of the real system.
고속궤도차량의 로드휠과 궤도의 접촉 강성 및 감쇠계수에 대한 실험적연구
김종수(J.S.Kim),방동창(D.C.Park),김재용(J.Y.Kim),최진환(J.H.Choi) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
An experimental study is presented for the contact property of the interactions between road wheel and track link in order to identify the dynamic characteristics of the tracked vehicle along the vertical direction and the loading conditions. The revolving rubber molded track link and road wheels are subjected to the reaction forces from the ground, the traction forces from the engine which lead to the tension, compression, and torsional load as the operational conditions and environment. The dynamic effect of the contact stiffness and damping coefficients between road wheel and track link is illustrated by using experimental methods which can be used to the dynamic simulation of the multibody tracked vehicle.