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송자상(Ja-Sang Song),허승진(Seung-Jin Heo),작기홍(Kihong Park) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.5_2
The VDC(Vehicle Dynamics Control) is an active safety system for ground vehicles which controls the dynamic motions in emergency situation. VDC is a control system whose target is to improve vehicle stability under the critical lateral motion. VDC can be implemented on the ABS/TCS system with a cost. Vehicle lateral dynamics is dramatically changed with a friction coefficient between tire and road surface. In this research, estimator for the road friction coefficient has been designed. The road friction has great affect upon the performance of the VDC system but is not directly measurable. The road friction coefficient estimator has been designed by using the Look-up table. The performance of the estimator has been verified by simulations.
가상반복법을 이용한 가상 시험기 입력 하중 산출에 대한 연구
류승훈(Seunghun Ryu),송자상(Jasang Song),박종찬(Jongchan Park),임정환(Jung hwan Lim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
This paper discusses Virtual Iteration Method (VIM) using Virtual Test Lab (VTL) to reproduce physical test to the proving ground. In general, VTL using Finite Element Model (FEM) and Multi Body Dynamics (MBD) Model is capable to describe nearly all physical behavior of complex vehicles. But, Many MBD models contain uncertain parameters like a stiffness and damping of bushings that reduce accuracy. With the help of VIM it is possible to compensate for these imperfections and to improve the output quality for fatigue life prediction. the number of company adopting CAE to obtain initial design guide line has increased. But, it is so difficult to estimate durability performance using a fatigue analysis in initial stage of a vehicle development. This paper proposes methods to evaluate durability in early design stage. That is the suggestion of strength criterion to satisfy target life using the damages calculated from the load history only before the initial decision of design shapes. Through a series of these processes, load conditions and allowable stress to be able to estimate the durability performances are calculated using static strength analysis in the initial design.