液壓動力源模組致動器阻流孔壓力對液體流率之影響研究

• Main Author: 何國南
• Other Authors: 吳泓瑜
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/70503776861766703819

碩士 === 中華大學 === 機械工程學系碩士班 === 97 === The accumulator (MS-28700-7, MIL-H-5606F) and the hydraulic oil (Hougto Safe1120) were discussed in the present study. The Nitrogen gas was pre-filled into the accumulator with a piston ring to separate the liquid and the gas. The tests were proceeded for different liquid pressure values in the accumulator, then released the liquid for different orifice diameters and choke by the solenoid valve. The relationship between the pressure and the volume with time was obtained. The relationship between the pressure and the volume will be used to the UAV catapult system to be the reference of the basic setting condition. From the result, the pressure of the Nitrogen gas in the accumulator will affect the volume of filling liquid. The higher pressure of Nitrogen gas will lead the lower volume of filling liquid, and the few liquid output will influence the pressure drop obviously. On the contrary, the lower pressure of Nitrogen gas will lead the higher volume of filling liquid. The flow rate was influenced by orifice diameters and choke, especially for the accurate displacement about the volume change. And the accuracy will be increased by the real experiment with the deduction of error, and the surrounding effects (temperature and interface friction) should be considered. From the theoretical and the experimental results, the approximate equation on pressure and volume was obtained by curve fitting method. Therefore, the torque, the flow rate and the rotational speed of the liquid pressure motor can be determined. The flow rate and the pressure were influenced by the orifice diameters and choke obviously. When the length of the choke is longer, the pressure drop is increased. The pressure of the filling liquid (3000psi) in the accumulator was 10 times than the pre-filled pressure of Nitrogen gas (300psi). By means of the results we may derive the equation for the relationship between the pressure and the volume by the curve-fitted method.