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45${\circ}$ 문합각을 가진 동맥과 PTFE 단측 문합의 유한요소해석
한근조,김형태,안성찬,신정욱,김영호,Han, Geun-Jo,Kim, Hyeong-Tae,An, Seong-Chan,Sin, Jeong-Uk,Kim, Yeong-Ho 대한의용생체공학회 1997 의공학회지 Vol.18 No.3
Von Mises stress and compliance distribution was evaluated using a finite element analysis on the anastomosis of an artery with length of 20mm(z direction, along the horizental artery), inner diameter of 4mm, thickness fo 0.5mm and a PTFE graft with length of 5.7mm, inner diameter of 2mm, thickness of 0.2mm when anastomotic angle was $45^{\circ}$ and inner pressure of 1330 dyne/mm2 was applied inside the 2 conduits. From the analysis results were obtained as follows. (1) Artery diameter increased in both horizontal x(along the length of artery) and vertical y(perpendicular to the length of artery)directions and the magnitude of that in x direction was bigger than that in y direction. (2) The compliance was maximum on the anastomosis, especially on that with acute angle. The reduction of compliance was observed from the anastomosis area to the either right or left end. (3) The equivalent stress was maximum on top in the y direction and minimum on the nodes apart $110^{\circ}$ in circumferential direction from the top. (4) The equivalent stress was maximum in t도 vicinity of anastomosis with acute angle along the longitudinal direction of the artery. This trend was also observed along the PTFE graft.
한근조(Geun-jo Han),안찬우(Chan-woo Ahn),김태형(Tae-hyong Kim),심재준(Jae-joon Shim),한동섭(Dong-seop Han),이호(Ho Lee) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
In this paper, we design a wedge type rail clamp which can protect container crane from wind with constant clamping force regardless of the operating period When we design wedge type rail clamp, it is important to determine the angle of wedge and analyze a contact conditon of roller and wedge so that we might develop a rail clamp with variable capacity. Therefore, this paper suggest a process to decide wedge angles within feasible range which could be obtained using load analysis and FEA of wedge type rail clamp.
실린더 벽면 변화가 2자유도계 충격흡수장치의 감쇠계수에 미치는 영향
한근조(Geun-Jo Han),안찬우(Chan-Woo Ahn),안성찬(Sung-Chan Ahn),심재준(Jae-Joon Shim),김성윤(Sung-Youn Kim) 한국항해항만학회 2002 한국항해항만학회지 Vol.26 No.1
컨테이너 크레인 스프레더는 체결시 발생하는 충격으로 인해 많은 고장이 발생한다. 이러한 충격력을 줄이기 위해 2자유도계 유압충격흡수장치를 설계하여 실린더 벽면의 치수변화가 감쇠계수에 미치는 영향에 대해 연구하였다. 내부압력이 작용할 때 벽면 치수를 2~30㎜로 변화시켜 이때 발생하는 실린더 벽면과 피스톤 사이의 틈새는 측정한 결과 6㎜이하의 치수에는 벽면형상 굴곡 되며, 10㎜ 이상의 치수에서 감쇠계수에 영향을 미치지 않는 것을 알 수 있다. Many malfunctions take place in container crane spreader due to impact. So we designed a 2 DOF hydraulic impact absorbing equipment to absorb the impact and we studied the change of damping coefficient with respect to the variation of dimensions of oil-cylinder wall. When we design the dimension of hydraulic cylinder wall considering the displacement on the wall, the value of it over 20㎜ didn’t affect the damping coefficient.