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이종신(Jong Shin Lee),성용주(Yong Joo Sung) 한국펄프·종이공학회 2017 펄프.종이技術 Vol.49 No.5
The applicability of cut office waste paper as a raw material for manufacturing elastic mats for infants was evaluated in this study. The elastic mat samples were prepared by using the cut office waste paper and various polymer binders with different making conditions. The density of each mat sample was controlled by changing the amount of binder addition. The tensile strength increased with the increase of the sample mat density. From this result, it can be estimated that the physical adhesion between the waste paper and the urethane binder was established. The optimum density for the manufacture and material properties of the elastic mat is about 0.7 g/cm³. On the other hand, the elongation of the mat decreased when the mat density increased. The elasticity of the manufactured mat was equal to or superior to that of the ready-made plastic mats.
격자볼츠만 법을 사용한 히브진동 운동하는 평판에서의 추력발생 연구
안상준(Sang-Joon An),김용대(Yong-Dae Kim),맹주성(Joo-Sung Maeng),이종신(Jong-Shin Lee),한철희(Cheol-Heui Han) 한국항공우주학회 2007 韓國航空宇宙學會誌 Vol.35 No.5
자연에 존재하는 곤충과 새들은 날개짓을 통하여 이동에 필요한 유체력을 발생시킨다. 실현 가능한 플랩핑 MAV를 개발하기 위해서는 날개짓과 추력발생사이의 관계에 관한 기초연구가 필요하다. 본 연구에서는 격자볼츠만법을 사용하여 히빙진동 운동을 하는 평판날개에서 추력 발생이 시작되는 조건을 파악하고자 하였다. 히빙진폭을 0.5C로 고정시키고 환원주파수가 추력발생에 미치는 영향을 파악하였다. 다양한 경우의 히빙진폭에 대하여 환원주파수와 추력 사이의 관계를 파악하고, 추력발생에 더 중요한 파라메터가 Strouhal수임을 보였다. Reynolds수 변화에 따른 추력특성을 파악하였다. 본 연구결과 추력발생이 시작되는 임계 Strouhal 수는 약 0.12이며 추력은 Strouhal 수에 대하여 지수함수의 관계를 갖는다. Insect and birds in nature flap their wings to generate fluid dynamic forces that are required for locomotion. To develop a feasible flapping MAV, it is of crucially important to study the fundamental relations between flapping motion and thrust generation. In this paper, the onset conditions of the thrust generation of a heaving flat plate is investigated using a Lattice-Boltzmann method. For a fixed heaving amplitude of h/C=0.5, the effect of reduced frequency on the thrust generation is investigated. For several values of heaving amplitude(h/C=0.25, 0.325, 0.50), the effect of reduced frequency on the thrust generation is also investigated. It can be said that Strouhal number is more important rather than reduced frequency in case of thrust generation. It is found that the critical Strouhal number over which the flat plate starts to produce thrust is around 0.1. Thrust is an exponential function of the Strouhal number.