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분말에서 발생하는 Washboarding 현상에 대한 이산요소법을 이용한 수치해석적 연구
이승준(Seoungjun Lee),박준영(Junyoung Park) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.4
Washboarding is a phenomenon in which a wavy shape occurs periodically and naturally on an unpaved road made of soil or gravel. This phenomenon causes high-frequency vibration of the traffic traveling on the road because of the height difference of the wave pattern, which may lead to vehicle failure. Consequently, associated research is needed concerning vehicle safety. Therefore, in this study, a numerical simulation was conducted using the discrete element method, which is often used for powder simulation. In contrast to previous studies, the results of this study demonstrate that washboarding can occur even in an environment of 1.5 m/s or less. However, the amount of washboarding is minimal. The study revealed that washboarding develops over time, such that sufficient development time is required before measurements are taken.
이산요소법을 이용한 회전체의 크기에 따른 Washboarding 현상에 대한 영향 분석
이승준(Seoungjun Lee),박준영(Junyoung Park) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.8
Washboarding is a crucial problem occurring on unpaved roads. This phenomenon involves the formation of ripples on the surface of the unpaved road and causes a critical problem to vehicles and riders. The phenomenon is affected by several parameters, but we focused on the velocity and the size of the rotating body. In the precedent research, we observed that a critical velocity existed for the occurrence of the phenomenon, and the phenomenon’s grade was related to the velocity. Therefore, this study, using a discrete element method, aimed to analyze the relation between the velocity and the size of the rotating body for the occurrence of the phenomenon and perform a fast Fourier transform (FFT) analysis to determine the correlation between the phenomenon and the period. The study observed that the critical velocity could vary from the velocity and the size of the rotating body, and there was a certain range of frequency for the occurrence of the Washboarding phenomenon.
드럼 세탁기에서의 세정력에 영향을 미치는 인자와 상관관계에 관한 기초적 실험 연구
전성빈(Sungbin Jeon),남진수(Jinsu Nam),이승준(Seoungjun Lee),서혜련(Hyeryeon Seo),박준영(Junyoung Park) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The washing is daily routine of people all over the world. According to Sinner’s circle, temperature, time, mechanical action and chemical action are critical factors for washing. The mechanical action is greatly influenced by the amount of fabrics and consumed power. This study aims to explore the relationship between the amount of fabrics, consumed power and washability. The experimental method is used to figure out correlation between consumed power, the amount of fabrics and washability.