载荷识别及其精度改善

本文系统地建立了载荷识别方法,详细探讨了提高载荷识别精度的途径,得到了载荷识别过程中信号处理加窗原则和试验的一般技术要求,使识别精度明显提高。     

Radar pulse interleaving for multi‐target tracking

In a multifunction radar, the maximum number of targets that can be managed or tracked is an important performance measure. Interleaving algorithms developed to operate radars exploit the dead‐times between the transmitted and the received pulses to allocate new tracking tasks that might involve transmitting or receiving pulses, thus increasing the capacity of the system. The problem of interleaving N targets involves a search among N! possibilities, and suboptimal solutions are usually employed to satisfy the real‐time constraints of the radar system. In this paper, we present new tight 0–1 integer programming models for the radar pulse interleaving problem and develop effective solution methods based on Lagrangian relaxation techniques. © 2003 Wiley Periodicals, Inc. Naval Research Logistics, 2004.     

载荷分布对六自由度运动平台动力学性能的影响

用Newton-Euler方法,分析了运动平台的力矢和力矩,建立了统一的六自由度运动平台动力学方程。利用该方程研究了不同载荷分布时六自由度运动平台各液压缸的受力情况,并用Matlab进行了计算。结果表明,不同载荷分布时,某些液压缸的驱动力的最大值成倍增加,变化极为复杂,为六自由度运动平台的设计及控制提供了理论指导。     

Interval uncertain optimization for damping fluctuation of asegmented electromagnetic buffer under intensive impact load

Aiming at the problems of demagnetization effect of electromagnetic buffer (EMB) caused by high ve-locity under intensive impact load and the difficulty and error of machining composite thin-walled long tube, a segmented EMB is proposed. The inner tube and air-gap are divided into initial segments and the traversing segments. Through theoretical analysis, impact test and simulation, it can be found that the RRF curve has two peaks. Firstly, in order to reduce the resultant resistance force (RRF) peaks, the sensitivity analysis based on optimal Latin hypercube design (OLHD) and polynomial regression was performed. The results show that the smallest contribution ratio to the dynamic response is the seventh and ninth segments of the inner tube, which are less than 1％. Then, fully considering the uncertain factors, important parameters are selected for uncertain optimization after sensitivity analysis. The in-terval order and interval probability degree methods are used to establish interval uncertain optimiza-tion model of the RRF considering robustness. The model was solved using an interval nested optimization method based on radial basis function (RBF) neural network. Finally, the Pareto front is obtained and numerical simulation is performed to verify the optimal value. It indicates that the two kinds of RRF peak is obviously reduced, and the optimization object and strategy are effective.     

某型火箭弹电点火系统雷电辐照效应研究

利用LSG-8015型雷电浪涌发生器与平行板传输线配合模拟雷电电磁脉冲辐射场,对整装状态下水平放置的某型火箭弹进行了辐照试验。比较了不同放电电压下某型火箭弹电点火系统的感应电压波形,试验了短路防护卡对雷电电磁脉冲的防护性能,提出了某型火箭弹雷电电磁脉冲防护的思路和方法。     

基于DRFM的机载PD雷达干扰研究

针对传统干扰技术对PD雷达干扰的不足,噪声干扰对干扰机功率要求高,欺骗干扰产生的干扰数目单一,基于当前对抗先进体制雷达的手段——DRFM,对PD雷达干扰进行研究。通过将截获的雷达信号存储、处理,按程序设定的转发间隔重复读出当前采样信号并转发,产生了多个距离欺骗假目标;通过对每次转发干扰进行频率调制,产生了包含距离速度欺骗的一系列假目标;并经过Matable仿真验证了在PD雷达窄带滤波器中,出现多个距离或速度欺骗假目标。并通过仿真验证了干扰的有效性。     

电磁脉冲对屏蔽双绞线耦合效应实验研究

从脉冲信号对屏蔽双绞线的容性耦合和感性耦合两个方面进行分析,采用实验脉冲信号发生器作为干扰源对基于非屏蔽双绞线和不同接地方式屏蔽双绞线的CAN总线通信系统进行实验．实验结果表明：非屏蔽双绞线和屏蔽层不接地屏蔽双绞线电磁脉冲耦合效果基本相同,屏蔽层双端接地可以抗脉冲信号的容性耦合和感性耦合．     

正偏压对ZrCuN薄膜的组织结构与性能的影响

采用磁控溅射技术在钛合金和单晶硅上沉积ZrCuN薄膜,考查了正负脉冲偏压对薄膜微观结构和硬度、韧性的影响。采用场发射扫描电镜观察截面形貌,X射线光电子能谱（XPS）分析元素结合状态,X射线衍射（XRD）分析物相结构。采用纳米压入仪进行加载、卸载试验,分析了薄膜弹塑性变形特性;采用压入法定量比较了薄膜的断裂韧性。结果表明：正偏压不影响薄膜结构,其效果在于提高沉积速率约20%,改变等离子体内电荷状态,从而改变了薄膜的成分。向ZrN中添加少量Cu,抑制了柱状晶,薄膜结构由T区向II区转变;ZrN薄膜中加入Cu后硬度并未降低,而韧性得到很大改善。Cu在薄膜中以2种形式存在：一是替换固溶到ZrN晶粒中;二是以单质Cu存在于晶界。     

飞行器点火爆炸通用测量装置的设计

针对飞行器试验用点火器的通用测量装置,提出了一种柱形爆炸容器的设计方法,从容器壁厚、反射超压、应用材料、容器结构以及点火器爆炸当量等方面进行考虑,计算柱形爆炸容器的压力瞬间载荷,并利用COSMOS Works软件进行应力仿真,最后通过实际飞行试验环节进行验证,回收采集系统所记录的试验数据并间接分析出点火器的工作状态,结果表明:试验结果和理论分析完全吻合,容器设计合理,从而为飞行器研制试验用点火器驱动动力装置提供必要的数据参考和支撑。     

水下无载波窄脉冲相关特征检测

广泛应用于超宽带雷达的无载波窄脉冲信号具有较高的距离和角度分辨率、超近程探测能力、便于目标识别、抑制混响起伏等独特优势.现将其应用于水下声纳系统,水下窄脉冲信号具有宽低频特性,从相关方法出发,讨论无载频窄脉冲对体目标信号的检测.根据窄脉冲信号脉宽内相关特征不变特性,体目标信号经过相关器和特征判决器,可明显减小虚峰出现的概率.数值模拟和实验均验证并证明单次检测即可检测到目标信号,精确检测峰值出现时间.