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이정근(Jeong-Keoun Lee),하원필(Won-Pil Ha),여태정(Tae-Jung Yea) 한국자동차공학회 2005 한국자동차공학회 Symposium Vol.- No.-
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.
송준영(June Young Song),하원필(Won Pil Ha),박승경(Seung Kyung Park) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Numerical analysis models of curtain airbags, based on the uniform pressure assumption, are usually composed of one chamber. Deployed state of a curtain airbag can be well simulated with one chamber. But there are some important things that can't be evaluated by this one chamber model. For example, the gas distribution in the early stage of bag deployment and diffusion of gas when CAB is exposed to external forces can't be known. The diffusing characteristic of gas in the early stage is essential to predict the CAB deploying motions. For this, a multi chamber model is introduced. The gas distribution results of multi chamber and a model of MADYMO gas flow module are compared. In addition to that, a pendulum test result is used to know the gas diffusing characteristics when CAB is exposed to external forces. The results from multi chamber model, one chamber model and real tests are compared for this.
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.
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.