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응력수명법을 이용한 탄소섬유강화복합재 로어 컨트롤 아암의 내구성 평가
장재익(Jaeik Jang),임주희(Juhee Lim),이종수(Jongsoo Lee) 대한기계학회 2017 大韓機械學會論文集A Vol.41 No.11
최근 자동차 분야에서의 CO₂ 배출 및 연비에 대한 규제가 강화되고 있다. 이에 따라 여러 기업들은 차체 및 차량부품에 복합재료를 적용하여 경량화를 이루고 연비향상을 통해 규제를 만족하고자 한다. 특히 현가파트 중 강한 하중을 받는 로어 컨트롤 아암의 경우, 운전조건을 만족하기 위해 대부분 두껍고 무겁게 설계된다. 따라서, 로어 컨트롤 아암의 경량화 및 그에 따른 내구성평가가 필수적으로 요구된다. 본 연구에서는 먼저 유한요소해석을 통해 하중조건에 따른 강도 및 강성 해석 값이 경계조건을 만족하는지 확인하기 위하여 구조해석을 수행하였다. 해석 과정에는 주응력 값을 기준으로 평가하고 관성제거기법을 적용하였다. 또한, 이를 바탕으로 응력-수명법을 이용하여 내구성평가를 실시하였다. Recently, regulations on fuel efficiency and CO₂ emissions have been reinforced in automobile industries. As a result, many companies make an effort to satisfy these regulations by adapting composite materials to the automobile body as well as its components. In particular, the lower control arm in the suspension system is subjected to heavy loads and is designed to be thick to meet operating loads. Therefore, it is essential for the lower control arm to reduce weight and to secure the durability assessment. In this paper, we conducted structural analysis by performing stress and stiffness analysis under given load conditions through finite element analysis, and verified whether it satisfies the load and stiffness conditions. The inertia relief method is adapted to the process of analysis, and the principal stress is used as a criterion for evaluation. Based on these results, the durability assessment is carried out using the stress-life method.
장재익(Jaeik Jang),신희석(Heeseok Shin),김현우(Hyunwoo Kim),김정하(Jungha Kim) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
Nowadays, various path planning studies are being conducted to implement level 3 of autonomous driving. In this paper, coordinate conversion is proposed when it is necessary to generate a path for lane change. Coordinate conversion is conducted between Cartesian and Frenet coordinate systems. A new path for lane change is generated by converting the coordinate from previously planned path. Also, polynomials are used to make a smooth path when changing lanes. Scenario evaluation is performed in Driving Scenario Designer and shows the validity of the lane change algorithm.
Hyunwoo Kim(김현우),Myeong-jun Kim(김명준),Jaeik Jang(장재익),Jungha Kim(김정하) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
Recently a lot of brand-new techniques of ADAS are being shown. Not only Longitudinal control but also lateral control system of the vehicle is getting commercialized by lots of motor company. This paper introduces a way of perception system of the autonomous vehicle which enables to change the lane. This system requires 3D LiDAR sensor and HD map (High-Definition map) for localization of the vehicle. It detects the objects on the road with 3D LiDAR sensor by making ROI (Region of interest) with curvilinear variable parameter acquired from the HD map. In addition, cluster the pointcloud and pick the vehicle using filters. Finally, this system acquires several key-data such as type and distance of the near-located-vehicle for the ego-vehicle to have enough data for lane change.