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Type Ⅳ 고세장비 수소저장용기의 Hoop 인장 시험에 관한 수치해석적 연구
박문식(MOONSIC PARK),이준숭(JUNSOONG LEE),윤원호(WONHO YOON),박균범(KYUNBUM PARK),윤현국(HYEONGUK YUN),주성욱(SUNGWOOK JOO) 한국수소및신에너지학회 2023 한국수소 및 신에너지학회논문집 Vol.34 No.1
In this study, in order to propose a integrity evaluation for type Ⅳ high aspect ratio hydrogen storage vessel, a numerical analysis of the hoop tensile test and pressure test was performed using FEM software, and the results of the actual physical property test were reviewed. The property test and numerical analysis were compared, and very similar results were obtained with deviations of maximum tensile strength of 4.75% and fiber direction stress of 5.39%.
자동차 시동용 LFP 배터리 팩의 혹한기 시동성 향상을 위한 열선 시스템 적용에 따른 열 유동 해석
우영한(Younghan Woo),강석원(Seokwon Kang),이준숭(Junsoong Lee),박문식(Moonsic Park),김성진(Sungjin Kim),성동길(Donggil Sung),주성욱(Sungwook Joo) 한국생산제조학회 2021 한국생산제조학회지 Vol.30 No.1
A numerical simulation for evaluating thermal performance was performed to determine the possibility of replacing existing lead-acid 12 V batteries with lithium-ion batteries. In batteries used for starting vehicles, low-temperature (≤–20℃) starting performance and lifespan decrease significantly. Therefore, a lithium iron phosphate (LFP) battery system with a relatively high energy density at low temperatures was studied. A system for self-energy heating was designed to improve operability under cold-weather conditions. In particular, the battery pack case, battery cell array, and heating system of the proposed system were designed to be compatible. Furthermore, a thermal performance simulation was performed using computational fluid dynamics and heat transfer techniques based on the estimated thermal properties of each component. The results showed that the self-heating LFP battery pack system reached its startable temperature (–3℃) after 75 s when 249 W of power was applied in a low-temperature (–20℃) environment.