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| 1 | 基于CFD降阶模型的阵风减缓主动控制研究显示文摘飞行器飞行时会受到大气紊流的影响,降低飞行品质。阵风减缓控制是改善飞行器飞行性能的关键技术。现有的阵风响应分析多以离散阵风为研究对象,对更加真实描述大气紊流的连续型阵风时域分析关注较少。采用成形滤波器方法将频域形式给出的大气紊流信号转换为时域信号。在跨声速区域内,利用系统辨识技术,基于计算流体力学(CFD)方法建立阵风激励下的气动载荷状态空间降阶模型(ROM)。为方便控制器设计,借助平衡模态法进行模型的进一步降阶。使用模型预测控制(MPC)算法通过控制操纵面偏转实现阵风减缓主动控制。以AGARD445.6标模作为仿真算例,验证基于ROM设计的阵风减缓控制律的有效性。仿真结果表明,在跨声速飞行状态下,模型预测控制器能够在满足操纵面偏转范围的约束下,对连续阵风激励下的翼根弯矩输出进行有效抑制。 | 聂雪媛 杨国伟 | 2015 | 航空学报2015，36，4： | 11 |
| 2 | Recent advances in precision measurement & pointing control of spacecraft显示文摘There exists an increasing need for precision measurement&pointing control and extreme motion stability for current and future space systems,e.g.,Ultra-Performance Spacecraft(UPS).Some notable technologies of realizing Ultra-Pointing(UP)ability have been developed particularly for Ultra-accuracy Ultra-stability Ultra-agility(3 U)spacecraft over recent decades.Usually,Multilevel Compound Pointing Control Techniques(MCPCTs)are deployed in aerospace engineering,especially in astronomical observation satellites and Earth observation satellites.Modern controllers and/or algorithms,which are a key factor of MCPCTs for 3 U spacecraft,especially the jitter phenomena that commonly exist in a UPS Pointing Control System(PCS),have also been effectively used in some UP spacecraft for a number of years.Micro-vibration suppression approaches,however,are often proposed to deal with low-level mechanical vibration or disturbance in the microgravity environment that is common for UPS.This latter approach potentially is one of the most practical UP techniques for 3 U tasks.Some emerging advanced Disturbance-Free Payload(DFP)satellites that exploit the benefits of non-contact actuators have also been reported in the literature.This represents an interesting and highly promising approach for solving some challenging problems in the area.This paper serves as a state-of-the-art review of UP technologies and/or methods which have been developed,mainly over the last decade,specifically for or potentially could be used for 3 U spacecraft pointing control.The problems discussed in this paper are of reference significance to UPS and millisecond optical sensors,which are involved in Gaofeng Project,deep space exploration,manned space flight,and gravitational wave detection. | Lin LI Li YUAN Li WANG Ran ZHENG Yanpeng WU Xiaoyan WANG | 2021 | Chinese Journal of Aeronautics2021，34，10： | 8 |
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