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김헌영,최종길,김정민,이강욱,여태정,Kim, Heon-Young,Choi, Jong-Gil,Kim, Jung-Min,Lee, Kang-Wook,Yeo, Tae-Jung 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.3
Numerical analyses are carried out to evaluate the cumulative impact damage of an automotive front end bumper under the low speed crash events(CMVSS215) by using explicit code. Results of first impact simulation, which are deformed shape, thickness, stress tensors and strain tensors, are used as the initial conditions for a next impact simulation. Between the events, the residual vibration is damped out by using nodal damping, and then recovery after each event is evaluated by several methods, one of which is a springback analysis with implicite finite element analysis code. The coupled analysis scheme for the evaluation of cumulative impact damage is verified through the comparison with test results.
이규훈(Kyu hoon Lee),정태영(Taeyoung Chung),여태정(Tae-Jung Yeo),이호욱(Ho wook Lee),양완석(Wan Seok Yang) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
This paper presents an Emergency Maneuver Assistance (EMA) function to develop the vehicle stability and agility using steering and braking control systems. The object of the EMA function is to avoid the crash to the forward subject. The EMA system consists of a sensor and a controller. The EMA function controller commands the steering torque to the MDPS ECU for the rapid steering and limiting the steer angle, and orders the brake pressure to the ESC ECU for the stability of the vehicle.
이정근(Jeong-Keoun Lee),하원필(Won-Pil Ha),여태정(Tae-Jung Yeo) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Computational analysis in restraint system development is an effective tool to curtail the development period. To meet the regulation and the NCAP (New Car Assessment Program), deterministic optimization methods have been widely used. Although there are variations in design, simulation and manufacturing in real world, quality of performance is ensured under uncertainty. Due to it needs complex intensive simulations to perform robust optimization and reliability assessment, Kriging RSM and screening method are employed to improve turnaround time. To ensure the accuracy and reliability of Kriging RSM, error estimation procedure investigated how well Kriging predict nonlinear phenomena of occupant simulation using cross validation. Based on verified Kriging RSM, robust design of an occupant restraint system is performed as an example. It is concluded that the proposed approach yield good result in terms of overall performance and time efficiency.
PMM에 구속된 부분 유한요소모델을 이용한 측면 에어백 개발 대응 수치 해석 기법
송준영(June-young Song),하원필(Won-Pil Ha),여태정(Tae-Jung Yeo) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Multi-body models with compliant planes/ellipsoids and full vehicle FE-mesh models have been used for side impact numerical analyses for development of SAB/CAB. Multi-body models can not provide enough amount of information in the latter stages of development. One the other hand, full vehicle FE-mesh models needs much computing resources, so it is a burden to do FVA with each airbags. Recently, FE-mesh model of a substructure with PSM from the results of FVA starts to be used in evaluating airbags. This efficient method has reciprocal relationships with FVA and it can be a problem for module companies who are hard to get FVA results. For a breakthrough, FE Analysis of a substructure restrained by PMM is newly developed. Characteristics, procedures, and some examples of this new method are introduced. This method is proved to be more economical and accessible for module companies than FVA and more informative than the multi-body with ellipsoids analysis.
황태훈(Taehun Hwang),정태영(Taeyoung Chung),이규훈(Kyu Hoon Lee),유은영(Eun Young You),여태정(Tae-Jung Yeo) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Due to the vehicle electronic and development of communication technologies, Besides the basic functions supporting the weight to the vehicle and mitigating the road impact, Tire is adding the additional function such as the TPMS(Tire Pressure Monitoring System). In addition, recently research of the intelligent tire system capable of measuring the tire force have been actively. Yet only the leading technology in the development stage, however, launching of the prototype is expected in the near future according to leading companies and excellent domestic and international research institutions . In this paper, Vehicle dynamic controller is designed using tire force information that occurred between the tire and road surface. The proposed controller is verified using CarSim simulation.