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김재실,최헌오 한국공작기계학회 1999 한국생산제조학회지 Vol.8 No.6
This article proposes the analytical and experimental approaches for the reduction of vibration generated in the gear box of an NC machine. The lateral critical speed of main spindle and torsional natural frequencies were analyzed and the impact testing of gear box was performed. These results were compared with the forced operating speeds. The vibration was much diminished by redesign of gear module and reinforcement of box structure.
김재실,안승국,이재환,안대균,최헌오 창원대학교 산업기술연구소 2001 産技硏論文集 Vol.15 No.-
This article describes (1) 2 and 3 dimensional electromagnetic finite element models for an active heteropolar radial magnetic bearing, (2) the procedure for obtaining the bearing stiffnesses by simulating the models and (3) the reviews of the models by comparing an experimental test to the ideal closed loop analysis with the stiffnesses calculated from(2). The 3 dimensional model for the magnetic bearing may be very effectively applied to several types of magnetic bearings.
김재실 국립7개대학공동논문집간행위원회 2002 공업기술연구 Vol.2 No.-
In design step of an active vibration control system, the stability analysis is required for obtaining a stable control region so that the system is protected from its violent natural vibration. This paper describes the procedure of stability simulation for the active magnetic bearing-main spindle of a machine tool. The characteristic equation of the overall system is derived by assembling the dynamic equation of a flexible shaft and the transfer functions of feedback components. And the stable region is obtained by calculating the eigenvalues of the characteristic equation. The simulated result shows a good agreement with comparing the measured stable control region.
김재실,안승국,이재환,안대균,최헌오 한국공작기계학회 2002 한국공작기계학회 춘계학술대회논문집 Vol.2002 No.-
This article describes (1) 2 and 3 dimensional electromagnetic finite element models for an active heteropolar radial magnetic bearing, (2) the procedure for obtaining the bearing stiffnesses by simulating the models and (3) the reviews of the models by comparing an experimental test to the ideal closed loop analysis with the stiffnesses calculated from (2). The 3 dimensional model for the magnetic bearing may be very effectively applied to several types of magnetic bearings.
유전자 알고리듬을 이용한 자동차용 미러 액튜에이터의 최적설계
김재실,김수태,최헌오 국립7개대학공동논문집간행위원회 2003 공업기술연구 Vol.3 No.-
An automobile mirror actuator system is required for the compatibility of mirror moving angle and speed. This article provides the procedure of a genetic algorithm(GA) based optimization with finite element analysis for design of a mirror actuator considering design constraints, reduction ratio, moving angle, operating speed.