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휴대성과 안전을 고려한 개인 이동 수단용 접이식 헬멧 개발
이인수(In Su Lee),김두언(Dueon Kim),이상운(Sangwoon Lee),홍하은(Ha Eun Hong),심재호(Jaeho Shim),박상인(Sang-in Park) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
The rapid expansion of Personal Mobility (PM) devices, such as electric scooters, bicycles, and segways, has led to a concerning trend of non-compliance with helmet usage among riders. To address this issue, we present a noble foldable helmet design that encourages users to wear helmets, providing enhanced convenience. To develop the design, we focus on three technical and aesthetic features: cellular material, foldability, and manufacturability. Cellular material, such as lattice structures and triply periodic minimal surface (TPMS) structures shows exceptional shock absorbing capability. Thus, it provides structural functionality for PM helmets. Moreover, it significantly reduces the helmet’s weight while simultaneously enhancing airflow, thereby greatly improving comfort during wear. Foldability ensures portability, allowing users to carry the helmet without any effort when not in active use. The additive manufacturing (AM) enables to fabricate complex shapes, such as TPMS-based inner cushion in the proposed design. This paper provides a comprehensive overview of the entire design process, including material selection, modeling procedure and manufacturing technique. We employed the finite element analysis to validate safety of the proposed design. We also present communication methodology through the design process among mechanical engineers and industrial designers.
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지능형 수동 변속기 제어용 2페달 구동인터페이스 시스템 개발
송창현(Changhyeon Song),조은수(Eansoo Cho),홍종호(Jongho Hong),김은식(Eunsik Kim),김두언(Dueon Kim) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
Environmental issues are emerging and fuel efficiency regulations in the auto industry are becoming aggressive day by day. Hyundai motor company have developed iMT(Intelligent Manual Transmission) technology to improve fuel efficiency. iMT is a technology that changes the conventional hydraulic clutch control to electronic control, and automatically shuts off engine power during coasting, improving fuel efficiency by up to 5%. However, due to the same driveline interface configuration as the conventional manual transmission, driver operation is still inconvenient. In this paper, we propose a two pedal driveline interface system that improves driver convenience by removing electronic clutch pedal from previous iMT vehicles. Instead of electronic clutch pedal, shift lever(iMT lever) detects the driver’s intention to shift and transmits clutch control signals to enable manual vehicle shift without clutch pedals.
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