http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
오늘 본 자료
이강희(K-H Lee),강흥석(H-S Kang),송기남(K-N Song),윤경호(K-H Yoon),최명환(M-H Choi) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Vibration characteristics of the FIV test loop for the Flow-Induced Vibration(FIV) study of a PWR partial(5x5) fuel assembly are investigated by the Finite Element(FE) analysis and the modal test. For the FE analysis, 3-D beam element is used for the pipes and the test section and mass element used for the valves and flanges. The 'U' restrainer stiffness determined by numerical simulation is used for the FE model. The result of the FE analysis is compared with that of the modal test. The higher mode similarity between the test and analysis is observed in a few low modes. After that, the mode similarity reduce as the mode goes high. It is concluded that the first to the third vibration modes are observed at the lower parts of the 6 inches restoring line, followed by a local mode at the test section, and the natural frequencies of the modes are 22.4 Hz, 26.0 Hz, 27.5 Hz and 31.4 Hz.
최명환(M.H. Choi),강흥석(H.S. Kang),송기남(K.N. Song),정연호(Y.H. Jung) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The spacer grid is one of the main structural components in the fuel assembly, which supports the fuel rods<br/> and maintains coolable geometry from an external load. A vibration test and a finite element analysis using<br/> ABAQUS on a dummy fuel rod continuously supported by Optimized H type(OHT) and New Double<br/> Plate(NDP) spacer grids are performed to obtain the vibration characteristics such as natural frequencies and<br/> mode shapes and to verify a finite element model. The results fro m the test and the finite element analysis are<br/> compared by modal assurance criteria (MAC) values. It is resulted that MACs for the first, the third and the<br/> fifth mode shapes are relatively good as compared with those of the second and fourth ones. The natural<br/> frequency differences between two methods as well as the mode comparison results for the rod with OHT<br/> spacer grid are better than those with NDP spacer grid. It is judged that the FE model for the NDP spacer grid<br/> spring should be modified to consider the long contact length which actually happen when the spring supports<br/> the rod.
측면충격하중 상태에서 격자구조물의 좌굴거동 해석모델 개선
윤경호(K-H Yoon),허성필(S-P Heo),강흥석(H-S Kang),김형규(H-K Kim),송기남(K-N Song) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.8
The drop type impact test and finite element analysis are established for examining the buckling behavior of a grid structure under the lateral impact load. This grid structure is composed several thin plates by laser welding. The finite element model is produced using preprocessor I-DEAS, and solved using nonlinear solver ABAQUS/explicit. Applied boundary conditions for dynamic impact analysis were nearly the same with actual boundary conditions for impact test. However, the dynamic impact parameters of a grid structure are good agreement with test results. Based on these results, the analysis model of the grid structure for FE analysis is adaptable for evaluating the dynamic buckling behavior of a grid structure. These test and analysis results will be adaptable for predicting the dynamic structural integrity of a grid structure not only the axial impact event but also the lateral impact event.
다중 구속조건을 고려한 격자체 구조물의 충격해석 모델개선
윤경호(K-H Yoon),강흥석(H-S Kang),김형규(H-K Kim),송기남(K-N Song) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The dynamic impact analysis is performed for predicting the buckling behavior of a grid structure under the lateral<br/> impact load by finite element method. The grid structure is composed of several thin plates which were inserted each<br/> other and then each contact places were welded by laser welding. The finite element model is produced using preprocessor<br/> I-DEAS, and solved using nonlinear commercial solver ABAQUS/explicit. In this work, two models are<br/> proposed for FE analysis. One is the simplified model and the other is multi constrained one. Applied boundary<br/> conditions for dynamic impact analysis were nearly the same with actual boundary conditions for impact test. The<br/> dynamic impact parameters of a grid structure such as critical impact acceleration, impact force and buckling mode and<br/> so on, are over-estimated with test results. Based on these results, the FE analysis model of the grid structure is need to<br/> modify the stiffness of a grid cell structure. According to these results, the FE model is modified for estimating the<br/> buckling behavior of grid structure. This modified FE model will be compared with test and analysis results using the<br/> simplified model.
윤경호(K-H Yoon),강흥석(H-S Kang),김형규(H-K Kim),송기남(K-N Song),김우곤(W-G Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.3
The drop type impact test and finite element analysis are established for examining the buckling behavior of a grid structure under the lateral impact load. This grid structure is composed several thin plates by laser welding. The finite element model is produced using preprocessor I-DEAS, and solved using nonlinear solver ABAQUS/explicit. Applied boundary conditions for dynamic impact analysis were nearly the same with actual boundary conditions for impact test. However, the dynamic impact parameters of a grid structure are good agreement with test results. Based on these results, the analysis model of the grid structure for FE analysis is adaptable for evaluating the dynamic buckling behavior of a grid structure. These test and analysis results will be adaptable for predicting the dynamic structural integrity of a grid structure not only the axial impact event but also the lateral impact event.