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범프 통과시 발생하는 충격신호에 대한 주관평가와 객관평가의 상관성 연구
유완석(Wan-Suk Yoo),김민석(Min-Seok Kim),장한기(Han-Kee Jang),안세진(Se-Jin Ahn) 한국자동차공학회 2005 한국 자동차공학회논문집 Vol.13 No.2
In oder to generate various shock signals in a field study, a passenger car was driven at several speeds over road profiles that included a number of half sine shaped bumps of various heights. A triaxial SAE pad sensor was mounted on the front passenger seat to measure the acceleration signals which might produce subjective discomfort. The measured accelerations were correlated with the subjective assessments of 14 subjects. The magnitude of subjective discomfort was found to be proportional to the VDV and also the peak to peak of the frequency weighted acceleration signal.
유완석(Wan-Suk Yoo),박동운(Dong-Woon Park),김민석(Min-Seok Kim) 한국자동차공학회 2004 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
In multibody dynamic simulations, a powertrain system used to be modeled as one rigid body just transmitting forces and torques for simple modeling and application. With one body modeling for the powertrain system, it could not be determined the reaction forces and torques between components. Thus, in this paper, a powertrain model was developed including an engine, a torque converter, a differential, and constant velocity joints. A quasi-static torque map was considered for the engine modeling, and torque ratio and capacity factor are considered for the torque converter modeling. The differential was modeled as a set of bodies with a relative constraint between two rotation angles, and the constant velocity joint was newly formulated with kinematic constraint equations. With the developed powertrain model, a dynamic simulation was carried to see dynamic response and reaction force occurred at the CV joint.
김민석(Min Seok Kim),김연태(Yon Tae Kim),문원길(Won Kil Moon),안세진(Se-Jin Ahn),유완석(Wan Suk Yoo) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
In order to compare subjective and objective assessments, a passenger car was driven at several speeds over several road profiles. To measure the acceleration signals of the whole-body vibration experienced by the seated subject who provided an subjective assessment, three triaxial translational accelerometers and one triaxial gyro sensor were mounted on the passenger seat and floor, respectively. Correlations were determined between the measured accelerations and the subjective assessments of 3 expert subjects and 9 general subjects using psychophysical power law.
Multibody Dynamic Modeling of a Powertrain System
김민석(Min-Seok Kim),유완석(Wan-Suk Yoo),박수진(Su-Jin Park),김두현(Doo-Hyun Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In multibody dynamic simulations, a powertrain system is usually modeled as one rigid body just transmitting forces and torques for simple modeling and application. With one body modeling for the powertrain system, it could not be determined the reaction forces and torques between components. Thus, in this paper, the constraint equation for the differential was modeled with an angular constraint between two rotation angles, and the constant velocity joint was newly formulated with kinematic constraint equations. Then, a powertrain model was developed including an engine, a torque converter, a differential, and constant velocity joints. A quasi-static torque map was considered for the engine modeling, and torque ratio and capacity factor are considered for the torque converter modeling. With the developed powertrain model, a dynamic simulation was carried to see dynamic response and reaction force occurred at the CV joint.
최규석(Gyu Seok Choi),차현경(Hyun Kyung Cha),손정현(Jeong Hyun Sohn),유완석(Wan Suk Yoo) 대한기계학회 2014 大韓機械學會論文集A Vol.38 No.1
가스회로차단기의 거동특성은 스프링 래치 시스템을 가진 고속 작동메커니즘에 좌우된다. 고속회로차단기의 차단시간을 줄이기 위해서 연구가 많이 이루어지고 있다. 본 연구에서는 고속회로차단기의 차단시간을 단축하기 위하여 래치의 윤곽최적설계에 관한 연구가 수행된다. 회로차단기의 거동특성을 분석하기 위해서 상용 다물체 동역학 해석프로그램인 MSC/ADAMS 를 이용하였으며, 시뮬레이션 결과는 시험을 통하여 매칭하였다. VisualDOC 를 도입하여 래치의 최적윤곽을 구하였다. 최적설계 수행결과 가스회로차단기의 차단시간을 약 8.6% 개선하였다. The dynamic characteristics of a gas circuit breaker depend on the underlying high-speed operating mechanism with a spring-actuated latch system. Many studies have been carried out to reduce the breaking time of circuit breakers. In this study, the optimum latch contour design is determined for reducing the breaking time of a circuit breaker. A multi-body dynamic model of the latch is established for analyzing the dynamic behaviors of the circuit breaker by using the MSC/ADAMS program. Simulation results are matched against experimental data. VisualDoc is employed for determining the optimal latch contour. From the optimum design, the breaking time of a gas circuit breaker is improved by about 8.6%.
김민석(Min-seok Kim),임의택(Eui-teg Lim),안세진(Se-jin Ahn),유완석(Wan-suk Yoo) 한국자동차공학회 2003 한국자동차공학회 지부 학술대회 논문집 Vol.2003 No.10
The effort to improve dynamic characteristics relating ride and handling comfort in the performance evaluation of a vehicle has been continued during test and development process. Technology of modeling and simulation for vehicle dynamic cuts down time and money compared with experiment. In this paper, the dynamic simulation of vehicle model was carried out with the AutoDyn7 program and the results from dynamic simulation were compared with the experiments. The comparison between the experiments and simulations showed a relatively good agreement in time and frequency domain.<br/>