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민항기 door damper용 칼날형 댐핑 오리피스의 설계
홍예선(Yeh-Sun Hong),권용철(Yong-Cheol Kwon),김종혁(Chong-Hyeok Kim),박설혜(Seol-Hye Park),박호열(Ho-Yeol Park),김상범(Sang-Beom Kim) 한국항공우주학회 2012 韓國航空宇宙學會誌 Vol.40 No.12
본 논문에서는 작동유의 최대 동점성 계수가 400cSt까지 변하는 조건에서 항공기 도어댐퍼용 칼날형 댐핑 오리피스를 설계하였다. 전산 유동 해석과 실험을 통하여 칼날 오리피스의 유량계수를 분석하였고, 오리피스의 크기와 칼날 각도, 유동방향, 레이놀즈수가 미치는 영향을 고려하였다. 이 결과를 바탕으로 오리피스의 크기에 따라 댐퍼의 성능 기준을 충족시키기 위해 제한해야 하는 댐퍼의 쿨롱 마찰력 범위를 유도하였다. In this paper a sharp-edged type damping orifice for an aircraft door damper were designed, where the dynamic viscosity of working fluid were assumed to change up to 400cSt. The discharge coefficient of the damping orifice were investigated by CFD analyses and experiments. In particular, the influences of orifice diameter, edge angle, flow direction and the Reynolds number were taken into consideration. Based on this, it has been deduced how high Coulomb friction forces of damper seals is to be allowed to meet the performance criterion with respect to the orifice size.
홍예선(Yeh-Sun Hong),도윤호(Yoon-Ho Doh) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
The design of a high speed axial piston pump for hydrostatic transmission systems requires specific understanding<br/> on where and how much its internal frictional and flow losses are generated. In this study, the frictional loss of a bentaxis<br/> type hydraulic piston pump was analyzed in order to find out which design factors influence the mechanical<br/> efficiency most significantly. To this end, the friction coefficients of the sliding components were experimentally<br/> identified by a specially constructed tribometer. Applying them to the three-dimensional dynamic model of the pump<br/> presented by Doh and Hong [1], the friction torques generated by the sliding components such as piston head , bearing<br/> and valve plate were theoretically computed. The accuracy of the computed results was confirmed by the comparison<br/> with the experimentally measured mechanical efficiency. In this paper, it is shown that the viscous friction on the valve<br/> plate and the drive shaft bearing is the primary sources of the frictional losses of the bent-axis type pump, while the<br/> friction forces on the piston contribute to them only slightly.