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레이저에 의해 패터닝 된 바늘과 탄성중합체와의 마찰 효과
김재구(Jaegu Kim),노승국(Seungkook Ro),박종권(Jongkweon Park),조성학(Sunghak Cho),황경현(Kyunghyun Whang) 한국레이저가공학회 2012 한국레이저가공학회지 Vol.15 No.3
The friction force of patterned needle in elastomer have been investigated to verify the application for bio and plastic industry. The micro pattern on the needle surface were prepared by 266 nm, 20 ns laser and 800 nm, 220 fs laser, which were able to generate the different surface roughness. The friction force was measured by the load cell of 10 N capacity. As the results, the friction force of no patterned needle is almost constant during the needle penetrates the silicone rubber sample. However, the needle having asperities shows the variation of the friction force. The higher the surface roughness is, the smaller the friction force is until the surface roughness is very high. In our experiment conditions, the reduction of the friction force by 20 % compared to no pattern needle was achieved with straight and 50 μm discrete line generated by 266 nm, 20 ns laser.
조성락(Sungrak Cho),경진호(Jinho Kyung),노승국(Seungkook Ro),박종권(Jongkweon Park),노명규(Myounggyu Noh) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
A micro magnetic bearing system with five degrees of freedom active control has been designed for a miniature spindle to be used in a μ-factory. A shaft of the micro spindle is suspended by five set of hybrid magnetic bearings at each side of the shaft. Permanent magnets produce bias magnetic flux for the magnetic bearings and an electric motor(Φ 24,70W) is set between the magnetic bearings. Five eddy current sensors are used to measure the shaft position. An analytical model of the system is developed for the design purpose. This model is verified through 3-D finite element analysis. A prototype spindle is designed and currently under construction.
조성락(Sungrak Cho),경진호(Jinho Kyung),노승국(Seungkook Ro),박종권(Jongkweon Park) 한국생산제조학회 2004 한국생산제조시스템학회 학술발표대회 논문집 Vol.2004 No.10
One of the obstacles for a magnetic bearing to be used in the wide range of industrial applications is the failure modes associated with magnetic bearings. These failure modes include power amplifier faults, position sensor faults, and the malfunction of controllers. Fault-tolerant magnetic bearing systems have been proposed so that the system can operate in spite of some faults. In this paper, we designed and tested a fault-tolerant magnetic bearing system. The system can cope with the actuator faults as well as the faults in position sensors, which are the two major fault modes in a magnetic bearing system.
조성락,경진호,노승국,박종권 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-
One of the obstacles for a magnetic bearing to be used in the wide range of industrial applications is the failure modes associated with magnetic bearings. These failure modes include power amplifier faults, position sensor faults, and the malfunction of controllers. Fault-tolerant magnetic bearing systems have been proposed so that the system can operate in spite of some faults. In this paper, we designed and tested a fault-tolerant magnetic bearing system. The system can cope with the actuator faults as well as the faults in position sensors, which are the two major fault modes in a magnetic bearing system.