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함영복(Young-Bog Ham),유진산(Jin-San Yoo),윤소남(So-Nam Yun),최병오(Byung-Oh Choi) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
Generally, flow-direction control servo valve can be used for speed and position control of hydraulic cylinder, and pressure control servo valve can be used for force control. In this paper, the simulation of dynamic force control characteristics of linear servo actuator which is consist of flow-direction control servo valve and low fiiction hydraulic cylinder was pcrformed. The simulation results indicate that the flow-direction control valve can be used to control the force of electro-hydraulic servo actuator for the test of automobile component and structure.
함영복(Young-Bog Ham),유진산(Jin-San Yoo),윤소남(So-Nam Yun),김광영(Kwang-Young Kim) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In general hydraulic power pack, the hydraulic piston pump that convert the mechanical power to the hydraulic one is driven by AC induced electric motor with shaft coupling. In this case, noise level is some high from the motor and coupling, and temperature of pumping oil and motor housing is some high It is also need the long space for installation of there. So we proposed that an electric motor having the rotor combines with cylinder barrel of hydraulic piston pump. It is very compact because of the two parts compose one body, and driving noise is so small due to the rotator of the electric motor is rotating in the hydraulic oil and it is no shaft coupling. 1n this study, we have developed new rotator of the electric motor and tested the performance of the electric motor integrated hydraulic pump.
조정대(Jeongdai Jo),박경민(Kyung-Min Park),노종호(Jong-ho Noh),함영복(Young-Bog Ham),유진산(Jinsan Yoo) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
The high voltage driving system with multi-phase shifter including piezoelectric actuators comprised a driving power unit for outputting the driving power by converting input alternate current into direct current, a frequency shifting unit for supplying the direct current power and shifting or generating a frequency, a high-voltage amplification unit for amplifying the input signal outputted from the driving power unit and the frequency shifting unit into a high-voltage signal, and a phase shifting unit for shifting the phase difference of the amplified signal applied to the high-voltage amplification unit and driving plural piezoelectric actuators sequentially. The results that the operating voltage was stable, the voltage loss ratio was low and the response velocity was fast could be obtained. An experiment on performance of the high voltage driving system with multi-phase shifter designed and manufactured as above described was conducted by using a piezoelectric pump having 3 sheets of round unimorph piezoelectric actuators laminated respectively in a rectangular case. It sucks any fluid by causing the first piezoelectric actuator to shift from the inlet porter side, the phase delay of 60° causes the second piezoelectric actuator to begin to shift, and the phase delay of 120° causes the third piezoelectric actuator to begin to shift. As a result of measuring each change in the outlet flow rate of the piezoelectric pump, it was shown that the frequency-flow rate characteristic, the voltage-flow characteristic, and the load pressure-flow rate characteristic were improved.
박중호(Jung-Ho Park),김진규(Jin-Gyu Kim),윤동원(Dong-Won Youn),함상용(Sang-Yong Ham),노종호(Jong-Ho Noh),유진산(Jin-San Yoo) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
MR fluid is a suspension of micrometer-sized magnetizable particles in silicon oil and a functional fluid whose apparent viscosity can be controlled by the applied magnetic field strength. In this paper, a rotary brake using MR fluid called MR brake for tension control of precision machinery such as roll-to-roll printing machinery is presented. First, to obtain the higher performance than conventional powder brake, a MR brake with a modified rotor shape is newly designed and analyzed using FEM. Second, the prototype of MR brake is fabricated with the optimized structural parameters and an experimental apparatus is constructed. Then, basic characteristics of the MR brake are investigated with the different MR fluids. Finally, the validity of the developed MR brake is verified through the comparison with the conventional powder brake.