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채유진,신병철,송성은,이형욱,Yujin, Chae,Byeong Cheol, Shin,Sung Eun, Song,Hyoungwook, Lee 한국교통대학교 융복합기술연구소 2022 융ㆍ복합기술연구소 논문집 Vol.12 No.1
This study has been carried out in order to improve the rolling problem by enhancing steering stability compared to the 2021 Student Car of the KNUT_EV team for KSAE. Among the various factors affecting steering performances, it was focused on the height of the centroid of weight, the motion ratio, and the spring deflection. In the 2022 Car, a pull rod suspension was used to reduce the height of the centroid of weight and designed with a structure of the rod and rocker to satisfy the target motion ratio. The spring deflection was testified by ADAMS and ABAQUS analysis, and the spring stiffness was selected at 350lb/inch and 450lb/inch for the front and rear wheels, respectively. As a result, the rolling angle of the 2022 Car was reduced compared to the 2021 Car, and the rolling phenomenon was improved.
고민석(Min-seok Ko),김주영(Jooyoung Kim),김유선(You-sun Kim),정기환(Gi-hwan Jung),채유진(Yujin Chae),김삼연(Samyeon Kim) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
Additive Manufacturing (AM) provides high degree of design freedom. This enables designers to fabricate complex geometries and enhance performance that cannot be achievable by conventional manufacturing. However, the high degree of design freedom from AM makes designers challenging to fully add design benefits from AM, because designers are not familiar with AM, which is new technology. In this study, we propose a bicycle helmet design process by considering AM capabilities. The objective of the helmet design is to redesign conventional bicycle helmet and then add new design benefits like lightweight and storage function, while keeping safety requirements of the conventional helmet. First, we analyze customer needs. Then, the customer needs are translated to engineering requirements. Lattice structure is utilized to achieve lightweight and safe helmet. Foldable structure of the helmet is proposed to make volume of helmet reduced and make the helmet as a storage of bicycle related items.