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은효준(Hyojun Eun),추용주(Yongju Chu),이승엽(Seung-Yop Lee) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
In these days, there is a paradigm shift from internal-combustion-engine vehicles to electric vehicles. Most electric vehicles developed include batteries mounted at the bottom, near the rear wheels. Hence, the robust design of underbody parts against the impact of external bodies or random stone chipping need to be made. In this study, the mathematical modeling and statistical probability analysis of stone chipping and tire slip are performed for identifying and confirming the critical zones of the vehicle underbody that may be damaged by stone chipping. Thereby, stone chipping can be predicted by simulations using the employed mathematical model, before conducting experimental verification using the existing methods. Furthermore, the development cost and time can be reduced because the elements of the designed underbody can be analyzed for robustness, and the safety factor can be established during the design stage.
차량 내부 조향장치 파손방지를 위한 아우터 타이로드의 최적 휨 설계
은효준(Hyojun Eun),신용상(Yongsang Shin),안명훈(Myeonghoon Ahn),정연웅(Yeonwoong Jung),김민준(Minjoon Kim),이문규(Moonkyu Lee),이희갑(Hee-Gab Lee),추용주(YoungJu Chu),이승엽(Seung-Yop Lee) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
In the automobile steering system, Tie-rod acts as a sacrificial part to protect the inner steering gear such as rack and pinion. Therefore, the allowable maximum buckling load is crucial design constraint as well as minimum buckling load. The previous model was recognized to be overdesigned so that it should be remodeled to reduce critical buckling load. In this paper, we showed design method of bent outer Tie-rod giving initial imperfection with eigen buckling mode. However, the bent design brings about mass gain although it makes substantial decrease of critical buckling load. So we set the multi-objective optimizing problem to minimize the value of critical buckling load and mass gain with two kinds of structure design variables – scale factor & bent length. As a result, we obtained the optimum parameters that reduced critical buckling load by 64.96%, and 9.05% mass gain.
타이로드 형상 설계 변수에 따른 좌굴 및 피로 특성 연구
신용상(Yongsang Shin),은효준(Hyojun Eun),이문규(Moonkyu Lee),이희갑(Hee-Gab Lee),추용주(YoungJu Chu),이승엽(Seung-Yop Lee) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
According to the recent trend toward light-weight in the automobile industry, the weight of the outer tie-rod should be reduced. Tie rod is one of important steering components in electric or fuel-cell vehicles as well as conventional internal combustion engine vehicles. Therefore, it is required to develop optimal design and manufacturing process of tie rod for light-weight conditions in various vehicles. In this paper, finite element analysis (FEA) has been carried out to study buckling and fatigue characteristics of aluminum alloy outer tie-rod using the commercial software ABAQUS. In addition, the thickness and the cutting angle of the outer tie-rod neck were set as design parameters to comprehend buckling and fatigue characteristics. It was concluded that the change of thickness showed the direct linear tendency on durability while the altered cutting angle did not show any direct influence.
신용상(Yongsang Shin),은효준(Hyojun Eun),추용주(Yongju Chu),이승엽(Seung-Yop Lee) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Safety regulations and environmental constraints on the automobile industry have been severe for years. Especially, it becomes important to develop a lightweight and reliable automotive body due to fuel economy and safety problem. There have been various methods for the optimal design of the reliable automotive body. However, the non-linear behavior of automotive-body in vehicle crashes makes difficult to accurately predict its deformation mode. In this study, pattern recognition and machine learning techniques are used for an novel optimization design of the automotive body. A large-scale data are classified by cluster analysis to find the desirable deformation mode with roof crush condition using simple body model. And then, the optimization is performed not only in the maximum load and total mass, but also in the deformation mode.
차량 엔진 회전 차수 측정 기반의 능동 소음 제어에 관한 연구
추용주(YongJu Chu),김규식(Kyusik Kim),이봉현(Bonghyun Lee),신용상(Yongsang Shin),은효준(Hyojun Eun),이승엽(Seung-Yop Lee) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
This research is about the way to control noise of the automobile powertrain actively. In earlier days, the physical ways for minimizing the friction or passive ways such as using vibration absorbers were applied to reduce noise caused by engine speed. However, these ways have had economic and technical limits to be applied at high-performance powertrain. This paper proposed the real-time way that can optionally extract dominant engine noises and eliminate them. The speaker generates wave that has reverse phase of particular noises which the passenger experiences. Then the real-time noise cancelation operates by overlaying the noise and the wave. It was also verified by automobile-running tests.