• 作者： 洪儒珍; 潘海林
• 作者服務機構： 美國阿拉巴馬大學機械及航太工程學系
• 中文摘要： 沿重力晃動旋回方向所激發搖動波對部份充掖體衛星貯箱（低溫液體氦及氦蒸汽）在表面張力影響下之三維非定常動力狀態作了分析。結果顯示，低頻重力晃動加於沿重力晃動旋回方向所激發的非對稱性搖動波振幅遠大於高頻重力晃動所激起之搖動波。這些搖動波對掖體力矩、慣性動量、液體粘性力矩及流體粘性力臂加諸於衛星三維貯箱轉動的影響亦加以研究和分析。瞭解搖動波如何通過液體粘性應力及動量促使衛星貯箱擾動對衛星推進系統之控制非常重要。
• 英文摘要： The dynamical behaviors of fluids affected by turn-around direction gravity jitter oscillations, inparticular the effect of surface tension on partially-filled rotating fluids (cryogenic liquid helium and heliumvapor) in a subscale Gravity Probe-B Spacecraft propellant tank imposed by time-dependent variation inthe turn-around fluctuations of gravity jitter, have been investigated. Results show that lower-frequencygravity jitter imposed on time-dependent turn-around direction gravity jitter induced a greater amplitudeof slosh wave oscillations and a stronger degree of asymmetry in liquid-vapor interface geometry thandid higher frequency gravity jitter. Fluctuations of fluid moment, moment of inertia, fluid stress forces,fluid stress moments and moment arms of fluid stress moments, which were caused by slosh wave excitationsexerted on the dewar wall container of the propellant tank along pitching, yawing and rolling axes, werealso studied. Understanding of slosh wave induced fluctuations in fluid stress force and fluid stress momentsexerted on a propellant tank is important in spacecraft control of propulsion systems.
• 中文關鍵字： angular momentum;gravity jitter; microgravity;sloshing dynamics; spacecraft viscous stress force
• 英文關鍵字： --