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Wire Rope Isolator 마운팅 수동 조작 패널의 진동 저감
김재실(Chae-Sil Kim),김동일(Dong-Il Kim),허종대(Jong-Dae Heo),황재덕(Jae-Deok Hwang) 한국기계가공학회 2014 한국기계가공학회지 Vol.13 No.6
This paper reviews a finite element model of a wire rope isolator (WRI) via an experimental comparison test. A local operation panel (LOP) mounted on a WRI is modeled using a finite element method. Mode analyses and harmonic analyses are conducted while varying of the thickness of the rope for the WRI. A feasible WRI can be selected considering the reduction of the vibration and the total weight of the LOP system.
복합공구대용 B축 회전테이블 웜 기어의 정/동적 안정성 및 피로에 관한 연구
김재실(Chae-sil Kim),강승희(Seung-hee Kang) 한국기계가공학회 2014 한국기계가공학회지 Vol.13 No.5
Highly functional mill turrets have been developed and continuously improved to shorten the manufacturing time and enable multiple uses. Among these, a mill turret with B-axis rotary table was developed. The B-axis rotary table should be evaluated for structural integrity. Moreover, its worm and worm gear for transmitting power should be able to endure fatigue damage. Therefore, this article presents a structural analysis of this type of B-axis rotary table and confirms its static stability by comparing the stress results to the allowable stress levels. Next, the dynamic stability of the rotary table was investigated via a mode analysis and a harmonic analysis in a range determined by the results of a modal analysis. Finally, a worm gear set, the main part that drives the rotary table, is analyzed for fatigue and to estimate its lifetime. The results of the fatigue analysis allowed a prediction of the life of the worm gear set. The analytical results show that the B-axis rotary table has good structural integrity.
복합공구대 비틀림계 진동에 대한 기어 맞물림 강성의 영향에 관한 연구
김재실(Chae-sil Kim),김수태(Soo-Tae Kim),조수용(Soo-Yong Cho),정훈형(Hoon-Hyung Jung) 한국기계가공학회 2009 한국기계가공학회지 Vol.8 No.2
This paper describes mathematical models of the torsional geared driving system for the indexing path and the mill driving path in a mill turret. The eigenvalue analysis for the models is conducted both with and without the gear contact stiffnesses. The natural frequency leads to the effect of gear contact stiffnesses on the vibration of torsional geared systems in a mill turret. It is necessary to analyze eigenvalues of the complex geared torsional system in order to prevent the unexpected vibrations.
Chae-Sil Kim(김재실),Hoon-Hyung Jung(정훈형),Bong-Kwan Park(박봉관) 한국기계가공학회 2013 한국기계가공학회지 Vol.12 No.6
High speed rotor systems with magnetic bearings have been the subject of much research in recent years due to the potential for active vibration control. In this thesis, optimal design was conducted for an 8-pole heteropolar magnetic bearing used in the flexible rotor of a turbo blower. In connection with bearing stiffness, this optimal design process was conducted using a genetic algorithm(GA), which is based on natural selection and genetics. The maximum stiffness of the magnetic bearing-rotor was found by considering the critical speeds of the flexible rotor. As a result, the magnetic bearings were optimized to have maximum stiffness.