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오우석(W. S. Oh) 유공압건설기계학회 2013 유공압건설기계학회 학술대회논문집 Vol.2013 No.10
The detent function of the current consist open-loop control by using Joystick and electromagnet. Therefore, the Detent function is affected by the disturbance. In this paper, I applied closed-loop control to detent function instead of open-loop control in order to have a constant performance in a real work environment. The closed-loop controller used in this paper is RNTOC which was proposed by W. S. Newman. Considering the real operating conditions, I have compared to the Detent performances with the open-loop control system and the RNTOC-based control system for various the weights of loads and the engines speeds. As a result, the RNTOC-based control system showed superior control performance to the current open-loop control system regardless of the disturbances. However, because of the time-optimal characteristics of the RNTOC-based control system, the system should solve the shock occurs during the boom stopping.
방한서(H. S. Bang),차용훈(Y. H. Cha),오우석(W. S. Oh) 한국해양공학회 1995 韓國海洋工學會誌 Vol.9 No.2
When structures are constructed by welding, structural elements are always accompanied by welding residual stress and deformation. Therefore, when the rigidity and strength of the welded structures is considered, it is very important to have sufficient information about the effect of initial deflection and welding residual stress on them.<br/> In this paper, the square plates with welding residual stress under compression are dealt with; First, heat conduction and thermal elastic-plastic problems are analyzed by finite element method using 4-node isoparametric elements for assessment on the ultimate strength of welding joint. Later, the ultimate strength of welding joint is assessed by examining the effect of changed type of loading.<br/> The specimens are 500×500㎜(a/b=1) and 750×500㎜(a/b=1.5) rectangular plates of whichthicknesses is 9.0㎜ and simply supported plates getting axiul load in each direction.