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〈논문〉 : 서보실린더 고무 실의 조건 별 마찰 실험 및 응용 해석 기술
박준식(Joonsik Park),허신(Shin Hur),김동수(Dong-Soo Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The rubber seal is a feature inserted into the servo cylinder to keep the air pressure constant. In order for efficient movements the frictional coefficient of the rubber seal needs to be minimized while the sealing is intact. In this work the friction characteristics of rubber on metal plate at various conditions are tested. The varying experimental conditions include roughness level, applied pressure, lubrication, and rubbing speed. The design of experiment approach is taken to assess the effect of each parameter. The nonlinear frictional response of the rubber is applied to the FEM model simulating the servo cylinder movement. The result demonstrates that precise optimization of the servo cylinder movement must be preceded by preliminary experiments coupled with the theory and FEM model.
이영화(Young Hwa Lee),최홍수(Hongsoo Choi),박준식(Joonsik Park),허신(Shin Hur) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In this report, we describe the process towards the fabrication of micro-size capacitive MEMS (micro-electro mechanical system) microphones. First, circular SiNx membranes with the thickness of 500 ㎚ are fabricated using Bosch DRIE process. The diameters of membranes are 500 ㎛, 1000 ㎛, 1500 ㎛ and 2000 ㎛. Electrodes on these membranes are deposited by Au evaporation. In the mean time, another wafer is prepared for back-plate using KOH anisotropic wet etching and DRIE. Air holes to reduce air damping are perforated using DRIE on the back-plate. Finally, eutectic bonding is used to assemble the membrane chip and back-plate chip. The final goal of this work is sensing acoustic sound using the fabricated capacitive MEMS microphone.
손영일(Youngil Son),박진수(Jinsoo Park),박준식(Joonsik Park) 한국추진공학회 2015 한국추진공학회지 Vol.19 No.5
Titanium alloys has been received an attention due to their excellent specific strength and many other superior properties in the application of components of flying subjects. In this study, Ti-6Al-4V (Ti64 alloy) has been selected in order to evaluate oxidation and degradation behaviors under the exposure of high temperature flame. The alloy has been coated with Al diffusion coating routes. The coated alloys showed an improved oxidation and degradation behaviors. The oxidation and degradation mechanism for the coated and uncoated alloys has been discussed in terms of microstructural observations.
손영일(Youngil Son),박진수(Jinsoo Park),박준식(Joonsik Park) 한국추진공학회 2015 한국추진공학회 학술대회논문집 Vol.2015 No.5
티타늄 합금은 비강도가 높고 다양한 장점이 있음으로 추진체의 다양한 부품에 사용되고 있다. 이러한 티타늄 합금은 고온 추진체의 부품에 사용될 경우, 고온의 화염에서 순간적으로 노출될 수 있음으로, 고온의 화염하에서의 내삭마 및 내산화특성을 평가할 필요가 있다. 본 연구에서는 티타늄 합금중 상용화되어 사용되는 Ti64 합금 (Ti-6%Al-4%V) 및 코팅된 Ti64 합금 고온화염하에서 내삭마 및 내산화 특성을 평가하고자 하였다. Ti64합금의 코팅은 알루미늄 확산코팅법을 사용하여 알루미나이드층을 표면에 코팅 후 내삭마 특성을 평가하였다. 표면에 알루미나이드층이 코팅되지 않은 Ti64 합금은 고온에서 노출시에 표면 박리현상이 발생하였으나, 코팅되지 않은 시험편은 표면박리현상이 나타나지 않았다. 화염노출시 코팅층의 역할 을 고찰하기 위하여 코팅층을 분석하였으며, 조직의 변화를 고찰하고 논의하고자 한다. Titanium alloys has been received an attention due to their excellent specific strength and many other superior properties in the application of compartments of flying subjects. Thus, the titanium alloys are required to evaluate degradation stability in the environments of high temperature flame exposure. In this study, one commercial alloy, Ti-6Al-4V (Ti64 alloy), has been selected in order to evaluate oxidation and degradation behaviors under the exposure of high temperature flame composed from a mixutre gas of oxygen and LPG. The alloy has been coated with diffusion coating routes, and the coated and uncoated specimens have been exposed to the flame environments. The coated alloys showed an improved oxidation and degradation behaviors. The improved mechanism for the coated alloys has been discussed in terms of microstructrual observations.