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충돌모의(sled) 시험에 의한 에어백의 승객보호 특성연구
이재완(J.W.Lee),윤경한(K.H.Yoon),박형원(H.W.Park),우덕현(D.H.Wuh),박준우(J.W.Park) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
The dynamic tests(sled tests) were conducted to evaluate occupant protection characteristics and features due to deployment of driver air bag under the different test conditions as FMVSS 208 S13(air bag depowering). The paper presents discussions for the trend of regulations and standards related to the air bag restraint system in the U.S. Especially, this paper is presented to discuss the test results due to the air bag depowering standard procedure.
[동력전단계부문] 안전도를 고려한 전동 틸트/텔레스코픽 조향주의 해석 및 설계
신문균(S.W. Hong),홍성수(M.K. Shin),박경진(G.J. Park),우덕현(D.H. Wuh) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The design process of the motor driven tilt/telescopic steering column is established by axiomatic design approach in conceptual design stage. By selecting independent design variables for improving performances steering system, each detailed design can be carried out independently. In the detailed design, the safety for crash environment and vibration reduction are considered. An occupant analysis code SAFE(Safety Analysis For occupant crash Environment) is utilized to simulate the body block test. Segments, contact ellipsoids and spring-damper elements are used to model the steering column in SAFE. The model is verified by the result of the body block test. After the model is validated, the energy absorbing components are designed using an orthogonal array. Occupant analysis are performed for the cases of the orthogonal array. Final design is determined for the minimum occupant injury. For vibrational analysis, a finite clement model of the steering column is defined for the modal analysis. The model is validated by the vibration experiment. Size and shape variables are selected for the optimization process. An optimization is conducted to minimize the weight subjected to various constraints.
임재문(J.M.Lim),한선규(S.K.Han),전원기(W.G.Jeon),우덕현(D.H.Wuh),박경진(G.J.Park) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
In order to evaluate protection systems for automobile occupants, real tests are performed in a controlled crash environment. Computer simulations are utilized to replace the extremely expensive real tests. In the computer simulations, it is very crucial to express the real environment precisely in the modeling process. The energy absorbing steering system plays an important role in vehicle crashes, because the system directly impacts on the occupant. In this study, an occupant analysis code ATB(Articulated Total Body)is utilized to understand and improve the crash performance of the energy absorbing steering system. The safety standard FMVSS 203 is simulated and used for the design evaluations. Segments and contact ellipsoids are utilized to model the body block and components of the steering system. Spring-damper elements and force-deflection characteristics are utilized to model the energy absorbing components such as plate bend and the polyacetal molding. Real component tests are carried out to extract the force-deflection curves. The body block test is carried out to validate the simulation model. After the model is established, the parameter study is carried out to evaluate the crash performance of the energy absorbing components. The usage of the orthogonal arrays for design is suggested for design. With the orthogonal arrays and parameter study information, the optimum of energy absorbing components are determined to reduce the occupant injury.<br/>
고속 주행시 횡가속도 제어를 위한 MDPS 시스템 개발에 관한 연구
박동진(T.J.Park),윤석찬(S.C.Yun),한창수(C.S.Han),이상곤(S.G. Lee),구상순(S.S.Goo),우덕현(D.H.Wuh) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2
Power steering systems for automobiles are becoming more popular for reduceing steering efforts of the drivers, especially during parking lot maneuver. Though hydraulic power steering has widely usec for many years . the efficiency of hydraulic system is not high enough. The MDPS system can solve the problems associated with the hydraulic power steering system. In this study, the MDPS system with ball-screw mechanism is proposed by the bond graph modeling which has the motor, torque sensor, ball screw mechanism and so on. On the basis of the velocity boosting torque controller, the lateral acceleration controller is added. As well as the result, we can set constant frequency characteristics and enhance directional stability at high speed maneuver by controlling MDPS motor with proportional to steering wheel angular velocity.<br/>