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이세복(Seybok Lee),여태정(Taejung Yeo),하원필(Wonphil Ha) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In order to develop occupant safety system, airbag module must satisfy various performance targets. One of them is to operate very well in hot and cold temperature conditions and the other is to meet the various injury criteria. In this study, under considering various design variables, driver side airbags are estimated in various experimental conditions such as hot and cold conditions. By using simulation model and design of experiments, the optimal design combination of occupant restraint system is derived. Both drop tower and real crash test are used to make the simulation model more reliable.
인비지블 조수석 에어백 용 Chute 구조물의 파손에 관한 시험 및 수치 해석적 연구
이강욱(Kangwook Lee),여태정(Taejung Yeo),박순조(Soonjo Park) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Invisible hard type instrument panel that is integrated with airbag door has a chute structure attached to the backside of the instrument panel. The function of this chute structure is to guide an airbag and to protect the instrument panel from the high pressure caused by airbag deployment. But it is difficult to obtain a proper design for the chute structure because the loading condition by airbag deployment is very fast and complex. In tins paper, the design procedure through experimental tests and numerical analysis was described to find the causes of fracture for several chute designs and to meet its strength requirements. And finally, some design guidelines for the chute structure were examined briefly.
전개선이 보이지 않는 조수석 에어백 도어의 레이저 스코링 부위 파단 형상 예측 모델 개발
이강옥(Kangwook Lee),여태정(Taejung Yeo),박순조(Soonjo Park) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_2
The main feature of invisible passenger side airbag is that airbag door and instrument panel are integrated and the tear seam is not visible. One of the performance requirements is no fragmentation of the airbag door when the airbag deploys at hot, room and cold temperature. Especially, it is very difficult to meet this requirement at cold temperature for hard type instrument panel. A new analysis model using finite element method, so called microscopic section model, was developed to predict the fragmentation and two kinds of laser-scored patterns were analyzed. It can be concluded that the analysis model in this study can be used to design the types of laser scoring with the minimum of real deployment test.<br/> <br/> <br/>
Cockpit 모듈 Knee Impact 해석을 위한 Lower-Body Impactor Model 의 적용 타당성에 관한 연구
이강욱(Kangwook Lee),김수상(Soosang Kim),여태정(Taejung Yeo) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
One of the functions of cockpit module is to reduce the occupant's knee injury at a crash accident. Cockpit modules have knee bolster and energy absorption brackets to meet this purpose. Especially, knee protection is crucial when the crash occurs with unbelted occupant condition. In the design stage of cockpit module, the knee protection performance needs to be verified by numerical simulation before real tests is performed. For doing knee impact simulation, lower-body impactor model has been used but the validation of using the impactor model was not clear because dummy upper-body and airbag are included in the real test. In this paper, the validation of lower-body impactor model was performed by multi-body occupant analysis with airbag and dummy. Finally, the knee injury by<br/> using FE model of cockpit module & lower-body model was compared to real sled test and the resulsts are discussed.<br/>
Kangwook Lee(이강욱),Daeyul Ha(하대율),Taejung Yeo(여태정),Chanjung Kim(김찬중) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The knee bolster of cockpit module is a crucial factor determining the occupant's knee injury in the frontal crash of a vehicle. The development of knee bolster needs numerical simulation in the design stage of cockpit module but it is very difficult to meet all its performances to comply with FMVSS 208 regulation within a given vehicle development schedule. So, the evaluation of knee bolster is required to be put in an early stage to achieve its performance objective and to satisfy the whole development schedule of vehicle. In this study, the simplification of analysis model for cockpit module and crash pulse condition were investigated and validated by tests and simulation as a way to perform the analysis in much earlier design stage. It is concluded that with this simplified approach, initial design of knee bolsters of cockpit module can be achieved and also it can shorten the total development period as well.
이정근(Jeongkeun Lee),하원필(Wonpil Ha),여태정(Taejung Yeo) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Although the improvement in occupant restraint system has been successful in increasing occupant survival rate in real world crashes, lower leg injuries frequently occur in frontal crashes, and general restraint system has been shown to have little effect on the reduction of lower leg injury risk. In study of offset frontal crashes, researchers found a relationship between tibia injuries and the amount of toe board intrusion. The paper evaluates lower leg injuries using two occupant analysis methods (PSM, PMM) with the dynamic toe board intrusion. It is found that models are able to predict the response of lower leg in offset crash tests. The paper will investigate the relation between contact stiffness and footwell rotation and response of lower leg for improving the accuracy of lower leg injuries.
김두형(Duhyung Kim),정태영(Taeyoung Chung),오세욱(Sewook Oh),고상진(Sangjin Ko),여태정(Taejung Yeo) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
This article proposes the integrated control system of ESC(Electronic Stability Control) and MDPS(Motor Driven Power Steering), called MICS(E+M)(Mobis Integrated Control System, ESC+MDPS), simultaneously improving vehicle stability and handling performance with reduced ESC intervention. The MICS(E+M) changes the steering characteristics of MDPS under some unstable situations as understeer or oversteer. It can give drivers a feedback of driving condition and lead them to do counter-steering maneuver toward proper direction by changing an assistant steering torque of MDPS. Vehicle test results show the proposed integrated control system enhanced the stability and handling of vehicle effectively in several driving maneuvers.
김진성(Jinsung Kim),허훈(Hoon Huh),이강욱(Kangwook Kang),하대율(Daeyul Ha),여태정(Taejung Yeo),박순조(Soonjo Park) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper deals with dynamic tensile characteristics for the polypropylene composite used in an IP(lnstrument Panel). This polypropylene composite is adopted in the dash board of a car, especially PAB(Passenger Air Bag) module. The dynamic tensile characteristics are important because the PAB module undergoes high speed deformation during the airbag expansion. The operating temperature of a car varies from -30캜 to 110캜 according to the specification. The dynamic tensile tests are performed at the low temperature(-30캜), room temperature(21캜) and high temperature(85캜). The tensile tests are carried out at strain rates of nine intervals ranged from 0.001/sec to 200/sec. The flow stress increases as the strain rate becomes higher. The flow stress decreases at the high temperature while the strain rate sensitivity increases. Finite element analysis of the tensile test with the special specimen was carried out with unmodified stress-strain curve obtained from the ASTM IV specimen directly. The analysis result shows that the load response is almost same with the experimental result but the strain is rather larger than the experimental result. The stress-strain curves were modified on the basis of the gage length change rate, that is the change of gage length divided by the crosshead stroke. The analysis result with the modified stress-strain curves showed good agreement with the experimental result. The material properties obtained from this research will be useful to estimate the airbag expansion accurately in engineering sense.
인휠 모터 적용 소형 전기차의 캘리퍼 소형화 개념 설계
김정민(Jeongmin Kim),이상목(Sangmok Lee),김동현(Donghyun Kim),이상문(Sangmoon Lee),여태정(Taejung Yeo) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
In this paper, braking characteristics of the in-wheel motor driven vehicle are analyzed to reduce the required capability of the friction brake. By braking simulations, it is found that the maximum braking force and power of the in-wheel motor driven vehicle are similar to the conventional vehicle. However, it is also found that the friction brake working number is reduced in normal braking situation. By using above characteristics, the friction brake is re-designed with a smaller brake pad of 42% reduced height and the same clamping force as the conventional friction brake.
김동현(Donghyun Kim),신경호(Kyeongho Shin),이상목(Sangmok Lee),여태정(Taejung Yeo) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
In-Wheel motor system consists of suspension, steering, electric motor, friction brake, and wheel and varies with the combination structure of each component. However, the key point of In-Wheel motor system to be applied in small electric vehicle is the integration capability to meet the requirements such as wheel space, power performance, strength of components and so on. This paper describes integration methodology for In-Wheel motor system on the rear axle with the consideration of the restricted wheel space and unsprung mass. In addition, optimization of the motor housing is performed to improve mass and strength of the In-Wheel motor housing according to the test specification of weight transfer from the tire patch. It is found from the results that the prototype In-Wheel motor system meets the vehicle performances and strength requirements.