http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
최종웅,이영선,이정환,Choe, Jong-Ung,Lee, Yeong-Seon,Lee, Jeong-Hwan 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.10
In this paper, the elastic deformation of cold forging die has been investigated to improve the accuracy of forged parts with FEM analysis and experiments using the strain gages. In the finite element analysis, two types of analysis are used to predict elastic deformation of die. The one is that dies are considered to be elastic body from initial stage to final one, and the other is that the dies are considered to be rigid body during forging simulation and then considered to be elastic body at elastic analysis. Considering the results of analysis and experiments, it is likely that the analytical results are in good agreement with experimental inspections. The method using the elastic assumption of die relatively takes a lot of time to simulate the forming operation. However, It is better that using an elastic die to predict not only the shape of product but also filling of die cavity.
수력플랜트 모델수차 성능시험을 위한 시험설비 적절성에 관한 연구
최종웅,조용덕,홍성택,조현식,차상훈 한국유체기계학회 2019 한국유체기계학회 논문집 Vol.22 No.2
Performance evaluation of model turbines in the development of a hydropower plant is critical for determining hydraulic performance. Generally, performance evaluation of a model turbine is performed in accordance with the criteria outlined in IEC 60193, and a facility meeting these criteria is required. However, even with the construction of a facility for testing model turbine performance, a suitable facility for performance evaluation is required. To ensure the reliability of the performance evaluation of the model turbine, the uncertainty of the test is evaluated. For advanced institutes, it is recommended that the total uncertainty be less than 0.25%. Herein, the total uncertainty according to the model turbine performance test was calculated to determine the suitability of the equipment for evaluating model turbine performance. The results of the test performed by an external organization were compared with the results of this study. The results indicated that the total uncertainty was less than 0.25%. The error range of the model turbine test results obtained by the external augmentation system and the results obtained by the turbine test equipment of the vertical axis and the horizontal axis was less than 0.5%. The adequacy of the model turbine performance test facility was thus demonstrated.