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차량 동역학 해석 프로그램 AutoDyn7을 이용한 차량 주행 시뮬레이션 및 시험 평가
허승진(S.J.Heo),탁태오(T.O.Tak),김상섭(S.S.Kim),유완석(W.S.Yoo) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2
A vehicle dynamic analysis program AutoDyn7 (Automobile Dynamics in G7) is developed during the G7 project with respect to "development of integrated software for the chassis system design and analysis"<br/> In this paper, computer simulations of the selected vehicle maneuver are performed using AutoDyn7 S/W. Simulation results are compared with the results of driving tests with experimental handling vehicle for validation and evaluation of the developed S/W AutoDyn7. It is expected that the vehicle dynamic analysis program AutoDyn7 is effectively applicable to design and analysis the chassis system in the early design stage of vehicle development.<br/>
차량의 시험개발을 위한 차량 동역학 모델링 및 특성분석방법
김상섭(S.S.Kim),정홍규(H.K.Jung),이종호(J.H.Lee),최강식(K.S.Choi),김중희(J.H.Kim),임세빈(S.B.Im),우현구(H.G.Woo),박홍철(H.C.Park) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2
This paper presents an effective modeling and simulation method for vehicle dynamic performance evaluation during test and development process. Each wheel suspension is modeled as translational joint which allows relative translational motion in vertical direction of car body. The neglected kinematic and compliance characteristics of actual suspension are included in the model as functional form in terms of relative wheel displacement or tire force and moment. These characteristics are easily obtained through SPMD test. A vehicle dynamic analysis and performance evaluation software has been developed using Matlab/Simulink. Simulation results for various test conditions shows good correlation with test results<br/>
현가장치의 준정적 해석을 이용한 효율적인 차량동역학 해석기법
김상섭(S.S.Kim),최강식(K.S.Choi) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
Vehicle dynamic modeling and simulation using multibody suspension model is now a standard method to predict the ride and handling performances of vehicles in the design stage. The multibody vehicle dynamics model that correctly include nonlinear geometric and compliance properties of suspension has usually about 100 degress of freedom and requires significant amount of simulation time. The main source of the long simulation time is the high frequency motion of suspension links that are connected with stiff rubber bushings. Since the mass and inertia of the suspension links are relatively small, the inertia forces and moments of the suspension link are negligibly small comparing to the transmitting forces and moments between car body and wheel. Thin paper presents an efficient modeling and analysis method of vehicle suspensions using generalized massless links thar are defined as massless links with own motion variables. The governing dynamic equations of the generalized massless link suspension model are derived, that are composed of a set of differential algebraic equations of motion and quasi-static force equilibrium equation. The force equilibrium equations are solved more efficiently by integrating the velocity equations of motion variables of generalized massless link. A planer 1/4 car model is used as a test example. The simulation results show that the generalized massless link suspension model is effective to eliminate high frequency response and is able to predict correctly the responses of motion as well as joint and bushing forces.<br/>
김상섭(S.S.Kim),정홍규(H.K.Jung) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
This paper presents an efficient modeling method of suspensions for vehicle dynamic simulations. The suspension links are modeled as composite joints. The motion of wheel is defined as relative one degree of freedom motion with respect to car body. The unique relative kinematics and kinematic constraint formulation between car body and wheel enables to derive equations of motion in terms of wheel vertical motion. By using velocity transformation method. The system equations of motion is systematically derived without kinematic constraints. A simple simulation example demonstrate the effectiveness of proposed method.<br/>
Fe - Ni Invar 합금 박막의 증착 및 박막 특성 평가
김상섭(S. S. Kim),고영호(Y. H. Koh),최장현(J. H. Choi),김병일(B. I. Kim),박용범(Y. B. Park) 한국진공학회(ASCT) 1999 Applied Science and Convergence Technology Vol.8 No.2
약 3.5 ㎛ 두께의 Fe-Ni계 합금 박막을 Al-killed 강 기판에 DC 마그네트론 스퍼터링법으로 증착하여 박막의 기본적인 특성을 평가하였다. 제조된 박막은 {110}_(박막)//{111}_(기판) 관계를 지닌 파이버 집합조직을 형성하였으며, 상온에서 200℃까지 가열과 냉각을 5,000번 반복하는 열피로 실험후에도 박리현상이 관찰되지 않을 정도로 박막과 기판은 강한 결합력을 유지하고 있었다. 또한 Fe-Ni계 합금 박막의 증착으로 상온에서 200℃까지의 온도영역에서 일반 Al-killed강에 비해 현저한 열팽창 감소가 유도될 수 있음을 확인하였다. 이러한 결과는 박막공정을 이용하여 Al-killed 강에 비해 더 낮은 열팽창 계수를 지닌, shadow mask 재료로 응용될 수 있는 새로운 재료 시스템을 실현할 가능성을 제공한다. Fe-Ni alloy thin films with about 3.5 ㎛ thickness were successfully grown on Al-killed steel substrates employing DC magnetron sputtering method, and then the film properties were characterized. The deposited film exhibited a fibre texture structure with the relationship of {110}_(film){111}_(substrate). We found that the adhesion between the film and the substrate was fairly good considering no debonding behavior after the thermal cyclic test of 5,000 times from room temperature to 200℃. Also we found that the Fe-Ni alloy deposition induced a significant decrease of thermal expansion in the range of room temperature to 200℃. The results highly support that it can be realized to produce, using film processing, a new material system with much lower thermal expansion coefficient which can be applied more as shadow mask materials than an Al-killed steel sheet.
이승관 ( S K Lee ),이창규 ( C K Lee ),류정록 ( J R Ryu ),검석수 ( S Su Kim ),김상섭 ( S S Kim ),김창영 ( J Y Kim ),장철수 ( Chou I Soo Chang ) 대한임상검사과학회 1993 대한임상검사과학회지(KJCLS) Vol.25 No.1
Calcium exists in serum in three forms, as the free ion and as complexes with proteins and with smaller molecules; of these, the ionized species is the one that in physiologically active. For this reason some investigators tried to find the most convenient method for estimating calcium IOns. In this study, we compared three measurements (Zeisler, Mario and Hanna method) for inoized calcium to our Nova 7 method. Patient comparison results for ISE(x) compared to the other three methods. (y) are : Zeisler=0.579x+0.944, r=0.394, n=50;Mario =0.435x+l.469, r=0.216, n=50;Hanna=O. 905x+0.749, r=0.479, n=50. In conclusion, all performance characteristics of the nomogram method evaluated in this study were found to be incompatible to the Nova 7 method for serum ionized calcium analySIS.
이운성(W.S.Lee),이지선(J.S.Lee),김상섭(S.S.Kim) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
A general real-time vehicle simulation approach that can be applied effectively to development and validation of vehicle active control systems in hardware-in-the-loop simulation is proposed. The multibody vehicle dynamics method based on relative generalized coordinates is employed to develop vehicle models that represent physical vehicle systems faithfully. Based on a parallel processing approach utilizing parallelism by independent kinematic chains and parallel integration. a symbolic processing approch is developed to generate parallel processing codes on . a shared-memory multiprocessor automatically.<br/>
현가장치의 기구학적 특성을 고려한 효율적인 차량동역학 해석방법
정홍규(H.K.Jung),김상섭(S.S.kim) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
This paper presents an efficient modeling and simulation method for full vehicle dynamic simulations. The vehilce is modeled as five bodies(car body. 4 wheels). Since each wheel has relative one degree of freedom, the vehicle model has ten degrees of freedom. The unique definition of relative kinematics between car body and wheel enables to model suspension as composite joints. By using velocity transformation method. the system equations of motion is systematically derived without kinematic constraints. Various simulations such as J-turn. slowly increasing steer. bump and sinusoidal sweep steer are executed to verify the justification of proposed vehicle model.<br/>