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Renuganth Varatharajoo Choo Tech Wooi Musa Mailah 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2011
Two degree-of-freedom controller is designed together with its governing equations for a spacecraft pitch attitude control. The attitude controller incorporates the Active Force Control (AFC) technique into the conventional Proportional-Derivative (PD) controller based spacecraft pitch attitude loop. The PD-AFC attitude controller is then employed to enhance the attitude pointing of the Combined Energy and Attitude Control System (CEACS). Numerical treatments are performed to validate the effectiveness of AFC, whereby the CEACS attitude performance is analysed from its accuracy point of view. The results show that the PD-AFC attitude control performance is superiorly better than that of the solely conventional PD type. 相似文献
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介绍了直接数字频率合成(DDS)技术工作原理及特点,给出了基于DDS设计的自动频率控制(AFC)系统的设计,形成一种能提供稳定频率的具有宽频带跟踪范围的AFC系统,并对其进行了性能分析。 相似文献
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基于计算流体力学(Computational fluid dynamics,CFD)技术,建立了一个适用于旋翼二维主动襟翼控制(Active flap control,AFC)数值模拟的方法。在满足对翼型参数化分析的前提下,使用Euler方程求解以提高计算速度,并采用嵌套网格方法对AFC旋翼后缘襟翼进行运动控制。应用所建立的方法,首先进行了算例验证计算,然后着重对AFC旋翼翼型进行了数值模拟。在此基础上,进一步开展了AFC旋翼翼型主要参数对后缘涡影响的计算分析。结果表明:提高桨尖马赫数、增加后缘小翼摆动频率能加快涡产生速度;而提高桨尖马赫数、增大后缘小翼摆动幅度和后缘小翼长度能增大涡的强度;但增大后缘小翼与主桨叶缝隙间距仅在一定范围内能够增加涡强度。 相似文献
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