航空兵编队与舰艇编队对抗数理战术

舰艇编队防空武器多样,防空区域层次明确,防空能力相对较强,在基于舰艇编队任务模式和编队组成分析基础上,对其防空系统策略进行研究;针对航空兵的快速机动性和战术灵活性,建立战术攻击策略库,结合基于毁伤等级的毁伤效果评估,进行了航空兵编队对舰艇编队数理战术研究,从而为战术决策提供依据,最后指出进一步研究的方向。     

Effect of the Interplanetary Electric Field on the Magnetopause From Global MHD Simulations

The north-south component B_z of the Interplanetary Magnetic Field (IMF) and solar wind dynamic pressure P_d are generally treated as the two main factors in the solar wind that determine the geometry of the magnetosphere. By using the 3D global MHD simulations, we investigate the effect of the Interplanetary Electric Field (IEF) on the size and shape of magnetopause quantitatively. Our numerical experiments confirm that the geometry of the magnetopause are mainly determined by P_dB_z, as expected. However, the dawn-dusk IEFs have great impact on the magnetopause erosion because of the magnetic reconnection, thus affecting the size and shape of the magnetopause. Higher solar wind speed with the same B_z will lead to bigger dawn-dusk IEFs, which means the higher reconnection rate, and then results in more magnetic flux removal from the dayside. Consequently, the dayside magnetopause moves inward and flank magnetopause moves outward.      

极地科考小型无人飞行器

针对小型无人飞行器在极地科考中的抗风扰动问题,通过神经网络改进卡尔曼滤波算法,提高小型无人飞行器对环境的适应性.基于小型无人飞行器自身状态信息与误差信息,在线调整系统的量测噪声和估计参数,提高信息融合精度;利用矢量域方法构建轨迹跟踪控制算法,基于目标航迹在线调整航向,提高小型无人飞行器在顺风、逆风、转弯的飞行品质和压航线精度.经过大量的仿真试验、实际飞行试验验证了方法的有效性,改进的卡尔曼滤波算法可以提供长时高精度信息,小型无人飞行器可以在野外6级风源扰动的情况下,实现稳定飞行,平均误差不超过10m.小型无人飞行器在南极实地科考中得到成功应用.     

Multi-objective output-feedback control for microsatellite attitude control: An LMI approach

Mixed H₂/H_∞ output-feedback controller with pole placement constraints against the internal uncertainty of moment-of-inertia variation and space environmental disturbances is proposed for mircosatellite attitude control. The multi-objective controller is designed based on linear model of attitude dynamics. The H_∞ performance takes into account both robustness stability against moments-of-inertia uncertainty and the disturbance rejection aspect. H₂ performance takes into account the LQG aspect which avoids the undesirable wheels’ saturation effect. In addition, the closed-loop poles can be forced into some sector of the stable half-plane to obtain well-damped transient responses. The problem is then reduced to a convex optimization involving linear matrix inequalities (LMIs), so it can be efficiently solved. The simulation results demonstrate that the presented mixed H₂/H_∞ control system is robust stable and optimal in the sense of H₂ norm, and has good steady-state and dynamic performances against the parameter uncertainties and various disturbances for the microsatellite attitude control system.     

新型磁流变减摆器节流孔流场分析

节流孔是磁流变减摆器产生阻尼的主要方式,在磁流变减摆器实际工作环境下,磁流变液经过磁场时会随磁场分布强度不同而产生变黏度等应激变化。建立某新型磁流变减摆器计算模型,通过改变节流孔孔径大小,使用商业软件 Fluent 对其所产生的流场进行分析,将模拟结果与实验结果进行对比。结果表明:磁流变液流通量及淤积效应是决定磁流变减摆器初始阻尼及时滞效应的主要原因;在 0.2mm 孔径时时滞效应最明显,且随频率增高磁流变减摆器对于外界激励反应速度明显下降。     

临近空间大气压力传感器现场校准装置研究

本文针对临近空间大气压力传感器现场校准需求,介绍了临近空间大气压力传感器现场校准装置工作原理, 进行理论分析与仿真,提出需突破的关键技术,给出了不确定度预估。     

本科秘书学概论教材建设探析

当前秘书学概论教材存在诸多不足。只有从端正教材编写态度、正确认识秘书学概论课程的地位和作用、明确学生就业实际出发,通过加强社会、学校、学生调研,统筹规划秘书学概论教学内容．创新教材叙述模式,加强教材多样化、立体化建设等途径,才能提高教材质量。     

Towards a cooperation between the arts,space science research and the European Space Agency – Preliminary findings of the ESA Topical Team Arts and Sciences (ETTAS)

The arts offer alternative insights into reality, which are explored by science in general, and broadened by the activities conducted by the European Space Agency [4] and other space agencies. Similar to the way the members of ESA are ambassadors for spaceflight and science, artists and cultural professionals are ambassadors for human expression, experimentation, and exploration. In June 2011, the ESA Topical Team Arts and Sciences (ETTAS) held a three-day workshop at the European Astronaut Centre in Cologne, Germany. During this workshop, topics and ideas were discussed to develop initiatives between the arts, sciences and ESA. The aim was to foster and expand the human and cultural aspects of space exploration, and at the same time offer a means of communication that aims to reach audiences beyond the scope of traditional space-related channels. The consensus of the team was that establishing and sustaining a transdisciplinary professional community consisting of ESA representatives, scientists and artists would fuel knowledge transfer, and mutual inspiration. Potential ways to provide a sustainable cooperation within and between the various groups were discussed. We present the preliminary findings including a number of measures and mechanisms to initiate and conduct such an initiative. Plausible organisational measures, procedures and consequences, as well as a proposition on how to proceed are also discussed. Overall, the involvement and cooperation between the arts, space science research and ESA will enhance in the citizens of the ESA member states the sense of public ownership of ESA results, and participation in ESA?s research.     

实测数据与标准地磁模型的比较

利用国际标准地磁模型,可以计算出任意点的磁场强度。本文对“风云一号”卫星的磁强计测量数据与标准地磁模型计算结果进行了平静期吻合性的比较。分析了地磁强度绝对值的地理分布规律以及平静期南大西洋磁异常区的数据变化情况,为进一步分析地磁扰动时期的变化情况打下基础。     

新形势下行业特色高校发展的思考——基于湖南工学院的个案分析

以湖南工学院为个案,分析新形势下行业特色高校发展的思路。行业特色高校应坚持为行业服务,依托行业将学校做优做强、办出特色;应在人才培养、科技开发、科技和管理咨询服务等方面为行业做好服务工作;应积极完善校企合作机制、搭建高校服务行业的平台。