http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
고가사다리차의 알루미늄 붐 형상의 최적설계에 관한 연구
김홍건(Kim Hong-Gun),나석찬(Nah Seok-Chan),홍동표(Hong Dong-Pyo),조남익(Cho Nam-Ik) 한국생산제조학회 2007 한국생산제조학회지 Vol.16 No.3
An Optimal shape design of the boom system in high ladder vehicles is performed using 3-D finite element method (FEM). Results of structural analyses providing displacements, stresses are implemented for the optimum shape design. Lanzcos algorithm is used for the modal analysis in order to find natural frequencies. The optimal shape including cross sectional thickness and length of the boom system is controlled by the subproblem method besed on displacement and Von Mises stress. It is found that a plenty of materials can be saved by using shape design optimization in high ladder vehicles. It is also found that the natural frequency is increased until 6th mode and maintained similarly or decreased after 6th mode.
PEMFC 시스템의 성능향상을 위한 단위전지 설계에 관한 연구
김홍건(Hong Gun Kim),김유신(Yoo Shin Kim),양성모(Sung Mo Yang),나석찬(Seok Chan Nah) 한국생산제조학회 2005 한국생산제조학회지 Vol.14 No.4
The catalyst layer design is one of the most important factors to enhance the performance of PEMFC(Proton Exchange Membrane Fuel Cell) system. The hydrophobic and ion conductive type is studied for the MEA(Membrane Electrolyte Assembly). It is found that those have some limitations for performance enhancement when they are used separately. Thus, the dual catalyst type, a mixed model, is developed for the better MEA performance. In the meantime, the design of flow field plate is subsequently carried out in order to give more enhanced output during its operation. The conductivity of flow field plate showed better performance in the case of manufactured by the more compressed process(20㎫) than by the less compressed process(10㎫). The micro-structure of the flow field plate is examined in details using SEM(Scanning Electron Microscope) to analyse the effects on the different compression processes.
고분자전해질형 연료전지의 성능해석 및 효율에 관한 연구
김홍건(Hong-Gun Kim),김유신(Yoo-Shin Kim),양성모(Sung-Mo Yang),나석찬(Seok-Chan Nah) 한국생산제조학회 2005 한국생산제조학회지 Vol.14 No.4
An experimental study is carried out to investigate the performance and the efficiency humidifying Membrane Electrolyte Assembly and having the double-tied catalyst layers in a fuel cell system which is taken into account the physical and thermal concept. Subsequently, an electric output produced by PEMFC(Polymer Electrolyte Membrane Fuel Cell) is measured to assess the performance of a stack, and the efficiency is also evaluated according to the different situation in which unit cell is placed with and without the humidification of the MEA. It is found that the measured values of stack voltage and current are influenced by the stack temperature, humidification, and the double-tied catalyst layers which give more enhanced values to be applied to electric units.