机载目标状态估计器

研究基于空载雷达测量下的机动目标状态估计器的设计问题。通过建立直角坐标状态方程和选取一种伪测量量，并采用测量模型线性化的方法，建立起了估计器的基本结构，在此基础上增加距离通道的冗余滤波，进一步提高距离通道的估计精度，最后将估计器联入整个综合火力／飞行控制系统中，进行了Ｍｏｎｔｅ Ｃａｒｌｏ仿真，仿真结果表明，设计的目标状态估计器具有很好的跟踪估计性能。     

皮卫星测控应答机信号互干扰研究

皮卫星上的测控应答机由于受体积、成本和功耗等因素限制,其性能指标比传统测控应答机差,测距、遥控和遥测信号相互干扰较为严重。重点分析了三类信号相互干扰产生的机理,获得相互干扰的不同特征,以及带来的影响。最后,根据分析结果验证了皮卫星测控应答机参数设计的合理性。     

LabVIEW在锂离子电池测试系统中的应用研究CSCD

针对锂离子电池测试系统需求,设计了采用Lab VIEW开发的测试系统。本文介绍了锂离子电池测试系统的组成和软件功能,叙述了Lab VIEW调用动态链接库实现CAN通信,叙述了利用Lab VIEW外部程序接口Active X控件实现数据库访问、Word报表生成和Excel电子表格导出。     

基于DDB的二维/轴对称三波交汇流场数值模拟

采用运动间断边界拟合算法,在运动网格下求解二维与轴对称欧拉方程组,对脱体激波、锥面波、三波交汇等多种稳态波系进行数值模拟,精确得到了多种典型激波形状、波后流场及波系结构。本文提出的运动间断边界拟合算法,系基于经典计算流体力学方法、R-H运动间断条件、运动边界条件和Delaunay背景网格技术,由指定的网格块边界拟合待求激波,并以网格分块方式解决多道波相交问题。通过引入轴对称形式欧拉方程组,直接将此算法推广至轴对称流动领域,并精确拟合了锥面波相交问题。算法精度高,易于在CFD程序基础上实现,可用于超声速飞行器进气道压缩面、唇口设计以及乘波体设计。     

E1784K基因变异与钠离子通道病建模与仿真(英文)

临床报道发现SCN5A上的一个位点突变E1784K基因变异会导致同时出现长QT间期III型综合征和Brugada综合征的特征。E1784K基因变异引起钠离子通道功能改变,但无法确定钠离子通道功能的改变是否能够解释LQT3和BrS交叠现象。为分析该问题,建立了详细的计算模型,从动作电位、有效不应期和伪心电图三方面进行仿真。仿真结果表明E1784K基因突变导致钠离子通道改变不能直接解释LQT3和BrS心电图特征交叠现象,而间接引起的ITo或者ICaL重构可以解释该现象。     

圆形太阳翼模态仿真与试验研究

利用有限元软件SAMCEF实现了圆形太阳翼模态仿真分析，探究了翼面预紧力、约束方式和悬吊弹簧重力卸载系统对太阳翼模态的影响。结果显示，翼面预紧力对太阳翼模态影响较大；支撑车约束方式微小影响太阳翼第一阶模态；有支撑车相比无支撑车，太阳翼第一阶模态频率差值可达32.89%，因此地面试验不能使用支撑车；含悬吊弹簧重力卸载系统可有效减轻重力作用对模态的影响；此外，当弹簧刚度小于7 N/m时，其对太阳翼模态的影响小于0.59‰。随后，采用工作模态法和双点激振方式，经预试验优化地面试验方案；采用正弦扫频方法进行模态测试，获得了圆形太阳翼的前四阶模态振型和固有频率。最后，通过有限元模型修正，使模态仿真结果误差保持在4.16%以内，符合测试相关标准的要求。     

弹性自驱动卷筒式伸杆机构展开刚度分析及校验

针对弹性自驱动卷筒式伸杆机构(STACER) 的展开刚度问题，分析了卷筒式伸杆机构的工作原理，基于等效连续体模型推导了卷筒式伸杆机构弹性卷筒的构型参数与刚度的关系式，分析了弹性卷筒末端螺旋角、末端半径、带厚、带宽对展开刚度的影响。分析结果表明：(1)末端半径的增大能同时提高弹性卷筒的一阶频率和比刚度，而带宽的增大将导致弹性卷筒的一阶频率和比刚度均降低;(2)弹性卷筒的一阶频率随带厚的增加近似线性增大，但比刚度随带厚的增大而近似按双曲线规律下;(3)弹性卷筒末端螺旋角在62°~75°时，弹性卷筒的比刚度可获得最优值。卷筒式伸杆机构的刚度测试结果与理论分析结果基本一致，校验了理论分析方法的有效性。     

Numerical studies of static aeroelastic effects on grid fin aerodynamic performances

The grid fin is an unconventional control surface used on missiles and rockets. Although aerodynamics of grid fin has been studied by many researchers, few considers the aeroelastic effects.In this paper, the static aeroelastic simulations are performed by the coupled viscous computational fluid dynamics with structural flexibility method in transonic and supersonic regimes. The developed coupling strategy including fluid–structure interpolation and volume mesh motion schemes is based on radial basis functions. Results are presented for a vertical and a horizontal grid fin mounted on a body. Horizontal fin results show that the deformed fin is swept backward and the axial force is increased. The deformations also induce the movement of center of pressure, causing the reduction and reversal in hinge moment for the transonic flow and the supersonic flow,respectively. For the vertical fin, the local effective incidences are increased due to the deformations so that the deformed normal force is greater than the original one. At high angles of attack, both the deformed and original normal forces experience a sudden reduction due to the interference of leeward separated vortices on the fin. Additionally, the increment in axial force is shown to correlate strongly with the increment in the square of normal force.     

Preparation of bimodal grain size 7075 aviation aluminum alloys and their corrosion properties

The bimodal grain size metals show improved strength and ductility compared to traditional metals; however, their corrosion properties are unknown. In order to evaluate the corrosion properties of these metals, the bimodal grain size 7075 aviation aluminum alloys containing different ratios of coarse(100 μm in diameter) and fine(10 μm in diameter) grains were prepared by spark plasma sintering(SPS). The effects of grain size as well as the mixture degree of coarse and fine grains on general corrosion were estimated by immersion tests, electrochemical measurements and complementary techniques such as scanning electron microscope(SEM) and transmission electron microscope-energy disperse spectroscopy(TEM-EDS). The results show that, compared to fine grains, the coarse grains have a faster dissolution rate in acidic NaCl solution due to the bigger size,higher alloying elements content and larger area fraction of second phases in them. In coarse grains,the hydrogen ions have a faster reduction rate on cathodic second phases, therefore promoting the corrosion propagation. The mixture of coarse and fine grains also increases the electrochemical heterogeneity of alloys in micro-scale, and thus the increased mixture degree of these grains in metal matrix accelerates the corrosion rate of alloys in acidic NaCl solution.