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안서욱,이신영,윤민수,장강원 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-
A new design for a lightweight flatbed trailer with high bending and torsional stiffness is presented by using an integrated CAE-based optimization procedure. The integrated design procedure consists of two main steps: topology optimization and thickness optimization. During topology optimization, a creative frame layout different from existing ladder-type frames can be obtained by searching the best layout out of all possible layouts of a simplified design domain model. After approximating the result of topology optimization as a thin-walled structure, the approximated thicknesses of the plates are optimized to minimize the mass of a trailer.
안서욱(Seo-Wook Ahn),이신영(Sin-Young Lee),윤민수(Min-Su Yoon),장강원(Gang-won Jang) 한국생산제조학회 2009 한국생산제조시스템학회 학술발표대회 논문집 Vol.2009 No.5
A new design for a lightweight flatbed trailer with high bending and torsional stiffness is presented by using an integrated CAE-based optimization procedure. The integrated design procedure consists of two main steps: topology optimization and thickness optimization. During topology optimization, a creative frame layout different from existing ladder-type frames can be obtained by searching the best layout out of all possible layouts of a simplified design domain model. After approximating the result of topology optimization as a thin-walled structure, the approximated thicknesses of the plates are optimized to minimize the mass of a trailer.
상용 유한요소해석 소프트웨어를 이용한 치아교정 시뮬레이션
안서욱(Seo-Wook Ahn),이신영(Sin-Young Lee),장강원(Gang-won Jang) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The objective of this investigation is to numerically simulate the continuous movement of teeth during the orthodontic treatment. The orthodontic system of teeth, periodontal ligaments, the alveolar bone including brackets and the arch wire is discretized by using solid finite elements, and solved to evaluate displacements of the teeth and stress distribution of the periodontal ligaments. Traditional expectation of a tooth movement is made based on the stresses on the periodontal ligaments; remodeling of the alveolar bone occurs according to the magnitude of the stresses acting on the peridontal ligaments. In this research, the long-term movement of teeth is simulated by continuously considering the deformation of the orthodontic system. To this end, the total treatment period is split into many small time steps, during each of which the permanent deformation of teeth is calculated in proportion to the instantaneous deformation of the teeth. In terms of the finite element analysis, when the current time step is changed to the next time step, the finite element model of the next time step is rebuilt by updating the spatial positions of the nodes of the current time step, which is performed by adding the current node positions and the corresponding displacements of the current time step. The effectiveness of the proposed approach is verified by solving three dimensional v-bend examples, for which. all the implementation is made by using the commercial finite element software, ANSYS.
이신영,안서욱,G. Q. Cai 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-
Nonlinear dynamic system under random excitation was analyzed by using stochastic method. Linearization methods were used in order to linearize non-linear structural characteristics but the parametric excitation was used as it was given. Nonlinear vibration problems of 1 DOF and 2 DOF system were analyzed in this research. Analytical method and equivalent energy method were introduced and applied to example system. The result were compared with Monte Carlo simulation result. From the comparison the combination method of the above two method was derived and showed good results.
이신영(Sin-Young Lee),안서욱(Seo-Wook Ahn),G. Q. Cai 한국생산제조학회 2008 한국생산제조시스템학회 학술발표대회 논문집 Vol.2008 No.5
Nonlinear dynamic system under random excitation was analyzed by using stochastic method. Linearization methods were used in order to linearize non-linear structural characteristics but the parametric excitation was used as it was given. Nonlinear vibration problems of 1 DOF and 2 DOF system were analyzed in this research. Analytical method and equivalent energy method were introduced and applied to example system. The result were compared with Monte Carlo simulation result. From the comparison the combination method of the above two method was derived and showed good results.
장강원(Gang-won Jang),이신영(Sin-Young Lee),안서욱(Seo-Wook Ahn) 한국생산제조학회 2009 한국공작기계학회 추계학술대회논문집 Vol.2009 No.-
Continuous movement of teeth during the orthodontic treatment is simulated by using the finite elment method. Traditional expectation of a tooth movement is made based on the stresses on the periodontal ligaments. In this research, the long-term movement of teeth is simulated by continuously considering the deformation of the orthodontic system. To this end, the total treatment period is split into many small time steps, during each of which the permanent deformation of teeth is calculated in proportion to the instantaneous deformation of the teeth. In terms of the finite element analysis, when the current time step is changed to the next time step, the finite element model of the next time step is rebuilt by updating the spatial positions of the nodes of the current time step, which is performed by adding the current node positions and the corresponding displacements of the current time step.
장강원(Gang-won Jang),이신영(Sin-Young Lee),안서욱(Seo-Wook Ahn) 한국생산제조학회 2009 한국생산제조시스템학회 학술발표대회 논문집 Vol.2009 No.10
Continuous movement of teeth during the orthodontic treatment is simulated by using the finite elment method. Traditional expectation of a tooth movement is made based on the stresses on the periodontal ligaments. In this research, the long-term movement of teeth is simulated by continuously considering the deformation of the orthodontic system. To this end, the total treatment period is split into many small time steps, during each of which the permanent deformation of teeth is calculated in proportion to the instantaneous deformation of the teeth. In terms of the finite element analysis, when the current time step is changed to the next time step, the finite element model of the next time step is rebuilt by updating the spatial positions of the nodes of the current time step, which is performed by adding the current node positions and the corresponding displacements of the current time step.
원형휜-원형관 열교환기의 휜효율 이론에 관한 수치적 검증
강희찬(H.C. Kang),임복빈(B.B. Lim),이종휘(J.W. Lee),장병춘(B.C. Chang),안서욱(S.W. Ahn) 한국전산유체공학회 2008 한국전산유체공학회 학술대회논문집 Vol.2008 No.-
The purpose of the present study is to investigate the convective heat transfer characteristics and the validity of fin efficiency of the circular finned-tube heat exchanger by using commercial CFD code. The heat transfer coefficient obtained by using the laminar model was 22% overestimated to the experimental data. The fin surface temperature compared with the experimental data measured by the liquid crystal method. The fin efficiency by the present numerical experiment, defined as normalized and averaged fin surface temperature, was greater than the theoretical fin efficiency and the difference is increased at high value of the factor m.