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회전축 정렬불량을 가지는 유연회전디스크의 유한요소법을 이용한 시간응답해석
허진욱,정진태,Heo, Jin-Uk,Jeong, Jin-Tae 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.9
Using the finite element method, this study investigates the dynamic time responses of a flexible spinning disk of which axis of rotation is misaligned with the axis of symmetry. The misalignment between the axes of symmetry and rotation is one of the major vibration sources in optical disk drives such as CD-ROM, CD-R, CD-RW and DVD drives. Based upon the Kirchhoff plate theory and the von-Karman strain theory, three coupled equations of motion for the misaligned disk are obtained: two of the equations are for the in-plane motion while the other is for the out-of-plane motion. After transforming these equations into two weak forms for the in-plane and out-of-plane motions, the weak forms are discretized by using newly defined annular sector finite elements. Applying the generalized-$\alpha$ time integration method to the discretized equations, the time responses and the displacement distributions are computed and then the effects of the misalign ment on the responses and the distributions are analyzed. The computation results show that the misalignment has an influence on the magnitudes of the in-plane displacements and it results in the amplitude modulation or the beat phenomenon in the time responses of the out-of-plane displacement.
멤브레인형 LNG선 Cargo의 만선항해 유한요소 열전달 해석
허진욱(Jin-Uk Heo),이영주(Young-Ju Lee),조진래(Jin-Rae Cho),하문근(Mun-Keun Ha),이중남(Joong-Nam Lee) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.4
In the LNG cargo, excessive generation of BOG causes economic loss and danger. So when one designs LNG cargo, one needs to analyze heat transfer exactly for minimizing BOG. But it is difficult to analyze heat transfer of LNG cargo, because cargo has a complex insulation structure and LNG carrier undergoes different kinds of transporting conditions. Considering these, in this paper, we model Mark-Ⅲ membrane-type LNG cargo and carry out the transient finite element heat transfer analysis during laden voyage. For this goal, we develop a PCL-language program incorporating with MSC/NASTRAN FEM software.
정진태,허진욱,최기영,Jeong, Jin-Tae,Heo, Jin-Uk,Choe, Gi-Yeong 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.5
The natural frequencies of a flexible spinning disk misaligned with the axis of rotation are studied in an analytic manner. The effects of misalignment on the natural frequency need to be investigated, because the misalignment between the axis of symmetry and the axis of relation cannot be avoided in the removable disks such as CD-R, CD-RW or DVD disks. Assuming that the in -plane displacements are in steady state and the out-of-plane displacement is in dynamic state, the equations of motion are derived for the misaligned spinning disk. After the exact solutions are obtained fur the steady -state in-plane displacements, they are plugged into the equation for the dynamic-state out-of-plane motion. The resultant equation is a linear equation for the out -of-plane displacement, which is discretized by the Galerkin method. Based on the discretized dquations, the effects of the misalignment are analyzed on the vibration characteristics of the spinning disk, i.e., the natural frequencies and the critical speed.
단면이 규칙적으로 변하는 미세유체 채널을 이용한 유전영동 기반의 박테리아 분리 장치에 대한 3D 시뮬레이션
한창호(Chang-Ho Han),김다민(Da Min Kim),송중현(Joong Hyun Song),정희원(Hee Won Chung),허진욱(Jin Uk Heo),장재성(Jaesung Jang) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
Dielectrophoresis is one of the most effective technologies for separating a species of particle or cell from a heterogeneous bioparticle mixture in a microfluidic channel. If the frequency of an applied AC voltage is tuned properly, targeted particles can be concentrated in the device while the others thrown away due to the opposite direction of the applied dielectrophoretic forces between them. In this study, a 2D planar microelectrode pattern is located on the bottom, and the targeted bacteria are forced to move downward periodically due to the changing cross-sectional areas, thereby the bacteria concentrated on the electrodes. We conducted a 3D simulation of particle tracing with respect to the flow rate, and the applied peak-to-peak voltage for the calculation of particle collection efficiencies of the bacteria in the device, and we compared with those of the conventional microseparator.