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5MW급 해상풍력 Sub-structure Jack-up Platform 수조모형시험
전정도(Jung-Do Jeon),전언찬(Eon-Chan Jeon) 한국기계가공학회 2013 한국기계가공학회지 Vol.12 No.1
The safety and stability of 5MW class offshore wind turbine Jack-up platform was investigated through ocean basin experiment. For simulating the environmental condition of yellow sea in the South Korea, diverse waves, winds and currents were performed based on Froude’s number. Regular wave and irregular wave based on Froude’s number were applied to the wind turbine structure. In experiments, the height and period of regular wave type were scaled down as the 1:50 ratio of real wave condition. Irregular wave type was simulated with TMA(Texel Storm, Marsen and Arsloe)spectrum. The vertical reaction force, resonance period and wave pressure applied to multi-supporters of wind offshore structure were measured experimentally. Finally, the results showed that the capsizing situation of the offshore structure was generated by the severe environmental condition.
5MW급 해상풍력 Sub-structure Jack-up Platform 최적화 설계
전정도(Jung-Do Jeon),전언찬(Eon-Chan Jeon) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.6
The purpose of this study is to optimize the design of the jack-up platform for 5MW offshore wind turbine system. Considering all the environmental loads such as currents, waves, winds and so on, the members of structures have been designed and optimized based on the AISC and API-RP-2A to be within the allowable stress even in the most critical and severe condition. In addition to the above strength check of structural members, the joint punching shear check and the hydrostatic collapse check are also performed where they are required for the design. The design life of the jack-up platform is 50 years for the static strength check and the fatigue design life is 100 years including to the DFF(Design Fatigue Factor) of 2.0 to have enough stability and workability for the design optimization.
절삭력 최적화를 이용한 금형의 생산성 및 표면조도 향상에 관한 연구
전언찬(Eon-Chan Jeon),이수용(Su-Yong Lee),이우현(Woo-Hyun Lee),김동후(Dong-Hoo Kim),전정도(Jung-Do Chun) 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.6
The mold is widely used for mass production in present industry. Also, product cycle time is faster, for this request, high productivity improvement in mold machining is required. And, In case of mold manufacturing company, the delivery shortening is required to quickly manufacture new product. Therefore, we aim for the delivery shortening though the method of machining time shortening in mold machining. On this paper, first, we made the NC-code of Insert die-casting as the object model using PowerMill. And then, analyzed cutting force by Toolpath in Insert mold machining using Production Module of Advantedge which is cutting force analysis program. After that, we came up with the optimum conditions of productivity improvement throughout the analysis result of before and after optimization of cutting force, machining time variation, and surface roughness by changing min tangential force to 80, 85, 90% of max tangential force.
보론 강의 스폿 용접 시 발생하는 스패터 감소에 관한 연구
지성환(Sung Hwan Jee),김진아(Jin A Kim),안광우(Kwang Woo Ahn),전정도(Jung Do Jeon),전언찬(Eon Chan Jeon) (사)한국CDE학회 2012 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2012 No.2
When assemble automotive steel that produced by stamping, it is widely used the resistance spot welding which is relatively easy to work with and has an outstanding bond force. Spot welding results in different features in welding zone depending on current, weld time and change of welding force, and therefore determine weld quality. If the spatter which generated in spot welding adheres to the surface of steel, it can have a bad influence on the quality of automotive exterior and needs additional work for removal. It can cause the rising of prime costs, irregular workload and the exterior with bad images. Thus, this study will examine the optimal welding condition in order to decrease the spatter through comparison of changes in the spatter according to welding current, welding force and welding time while resistance spot welding.
이수용(Su-Yong Lee),이우현(Woo-Hyun Lee),김동후(Dong-Hoo Kim),전정도(Jung-Do Chun),전언찬(Eon-Chan Jeon) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
On this paper, first, we make the NC-code of Insert die-casting as the object model using PowerMill. And then, analyze cutting force by Toolpath in Insert mold machining using Production Module of AdvantEdge which is cutting force analysis program. After that, we come up with the optimum conditions of productivity improvement throughout the analysis result of before and after optimization of cutting force, machining time variation, and surface roughness by changing min tangential force to 80, 85, 90% of max tangential force.