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남무호 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.5
This paper presents the development of a semi-active seat damper using MR fluids and the performance analysis of seat suspension system with a MR seat damper. An annular orifice type MR seat damper is proposed for a seat suspension of a commercial vehicle. After formulating the governing equation of motion, then an appropriate size of the seat damper is designed and manufactured. Following the evaluation of field-dependant damping force characteristics, the controllability of the damping force is experimentally demonstrated in time domain by adopting PID controller. A semi-active seat sus-pension with the proposed MR damper is constructed and its dynamic model is established. Subsequently, vibration con-trol capability of the semi-active suspension system is investigated by employing the sky-hook controller.
ER시트댐퍼를 사용한 상용차운전석의 실험적 성능해석 및 진동제어
남무호 한국공작기계학회 1998 한국생산제조학회지 Vol.7 No.3
This paper presents a new concept of a commercial vehicle seat suspension system. The proposed suspension system features an ER(electro-rheological) damper which can produce continuously tunable damping forces by control electric fields. A dynamic model of the ER damper is first achieved by incorporating Bingham property of the ER fluid, followed by the formulation of governing equations of motion for the suspension system. The effectiveness of the proposed ER seat suspension system is evaluated by investigating vibration isolation with respect to sinusoidal inputs.
선삭가공시 LASER BEAM 을 이용한 금속의 표면 거칠기 측정에 관한 연구
김희남,남무호,황재연,박희재 한국산업안전학회 1991 한국안전학회지 Vol.6 No.4
In - process measurement of surface roughness is introduced which employs an optical method by using laser beam. This makes it possible to detect the surface roughness not only along the circumferential path but also along the feed direction even during machining. The maximum roughness value is always abtainable from the reading along the feed direction.