导弹系统电磁兼容预测初探

基于"电磁拓扑"和"电磁屏障"概念,应用"电磁拓扑-图论混合技术"详细阐述了导弹系统的电磁拓扑描述及电磁干扰相互作用关联图,并分析了针对导弹武器系统应用电磁拓扑图论法的基本步骤。     

二维时变电磁场第一边值初值问题广义解的存在与唯一性

在频率为１０１０以下的情况下,给出了由正弦交变电流引起的二维时变电磁场所对应的偏微分方程,并用非线性算子半群理论及单调算子理论证明了相应偏微分方程第一边值初值问题广义解的存在与唯一性．     

导弹电子设备电源线传导敏感度测试研究

采用ＣＳ０１测试法对导弹武器系统的电子设备进行电源线传导敏感度测试,由于测试指标和测试方法的限定要求,将不仅影响受试电子设备的正常工作,而且还会对ＣＳ０１设备本身产生不利影响。在分析产生上述影响原因的同时,有针对性地提出了有效的解决措施,使由于限定要求带来的不利影响降低到最低限度,以使导弹电子设备电源线传导敏感度测试能按国军标规定要求正常进行。     

存储示波器在测量核爆炸电磁脉冲中的应用

介绍了存储示波器在核爆炸电磁脉冲测量中的应用,给出了系统框图,用计算机作ＦＦＴ运算,实现频谱分析．     

Theoretical and numerical simulation study on jet formation and penetration of different liner structures driven by electromagnetic pressure

The use of a shaped liner driven by electromagnetic force is a new means of forming jets. To study the mechanism of jet formation driven by electromagnetic force, we considered the current skin effect and the characteristics of electromagnetic loading and established a coupling model of"Electric—Magnetic—Force"and the theoretical model of jet formation under electromagnetic force. The jet formation and penetration of conical and trumpet liners have been calculated. Then, a numerical simulation of liner collapse under electromagnetic force, jet generation, and the stretching motion were performed using an ANSYS multiphysics processor. The calculated jet velocity, jet shape, and depth of penetration were consistent with the experimental results, with a relative error of less than 10％. In addition, we calculated the jet formation of different curvature trumpet liners driven by the same loading condition and ob-tained the influence rule of the curvature of the liner on jet formation. Results show that the theoretical model and the ANSYS multiphysics numerical method can effectively calculate the jet formation of liners driven by electromagnetic force, and in a certain range, the greater the curvature of the liner is, the greater the jet velocity is.     

LDO稳压器敏感度建模与仿真技术研究

基于LDO稳压器在电磁干扰（EMI）下产生直流偏移失效的机理分析,展开敏感度建模与仿真方法研究。使用一款实验芯片,创新地引入片上电压传感器,用于测试EMI在LDO稳压器内部的传播特性。在敏感度建模中,建立等效电路模型,通过直流功能测试,Z参数阻抗特性测试验证模型的正确性,将该模型用于LDO稳压器的敏感度预测。在敏感度仿真过程中,通过分析关键子电路和不断增加寄生元件,仿真不同寄生因素对敏感度影响的权重。将仿真结果与传导直接注入法（DPI）片上测试结果对比,仿真结果与DPI测试在频域1MHz至1GHz匹配。     

基于电磁涡旋的雷达目标成像

作为信息载体的电磁波除了传统的携带信息方式外,近年来其波前以电磁涡旋形式展现的信息调制能力也越来越受到关注。本文综述了电磁涡旋在信息调制等方面的研究进展,阐述了其在雷达信息获取方面的潜在应用价值。针对圆形相控阵列,建立了电磁涡旋波照射下理想点散射目标的回波模型。将各阵元的接收信号按照与发射时相同的模式移相后,沿圆周积分即可获得雷达阵列的输出回波。该回波可表示为经平方Bessel函数调幅后的傅里叶基函数的线性组合。结合Bessel函数的频谱特性,分析了轨道角动量态与方位角变量之间的近似对偶关系,利用逆投影和滤波-傅里叶变换方法进行了成像处理。仿真实验表明,电磁涡旋对雷达目标具有方位向成像的潜力。本文的研究可为新体制的雷达设计、目标识别技术的发展提供参考和借鉴。     

基于FDTD方法的电波在等离子体中传输特性研究

根据时域有限差分法(Finite Difference Time Domain, FDTD)的基本原理,本文首先分析了等离子体的物理场特性及数值计算,然后介绍了飞行器再入时等离子鞘的形成以及等离子体相对介电常数对波的衰减,最后通过三维FDTD和二维FDTD模拟了电磁波在等离子体中的传播情况,证明了FDTD方法是解决电磁波在复杂媒质中传播的一种有效方法,并探究了飞行器再入段黑障区通信的理论和方法。     

美军信息体体系架构研究

分析了美军信息体体系架构提出的背景,从信体联合信息环境的总体构想、使命任务、能力视图、作战视图等4个方面介绍了美军信体信息体系架构的主要内容,提出了对未来信息服务体系建设的启示。     

Influence of high frequency pulse on electrode wear in micro-EDM

An electromagnetic coupling mathematical model is established by finite element method and is verified by the contrastive experiments of copper matrix Ni–TiN cylindrical coating electrode, copper electrode and Cu50W electrode. The wear mechanism of Ni–TiN/Cu composite electrode in the case of high-frequency pulse current is studied, and the influence of the fluctuation frequency of discharge current on electrode wear in micro-EDM is found out. Compared with the electrode made from homogeneous material, the high frequency electromagnetic properties of Ni–TiN composite layer can be used effectively to inhibit the effect of high frequency pulse on the electrode and improve the distribution trend of current density.