圆形电流误差边界限定形式的永磁同步电机预测控制

针对图形边界限定形式的感应电机预测控制存在简洁、直观等优点,进一步考虑将该控制策略应用于永磁同步电机.预测控制将电机和逆变器作为一个系统整体考虑,以空间电流矢量为控制对象,直接产生逆变器的开关控制信号.基于永磁同步电机在转子磁场坐标系下的数学模型,推导出电流矢量导数的估测模型,进而预测出电流矢量的轨迹,根据最优电压矢量选择判据选定开关状态,完成基于圆形电流误差边界限定形式的永磁同步电机的预测控制算法.通过MATLAB/SIMULINK进行仿真,仿真结果证明了提出方法的有效性.     

多兵种交战中作战指数迭代计算方法及收敛性研究

对于大规模多兵种交战,作战指数评估是进行军事决策的重要依据.针对传统作战指数评估方法依赖专家经验知识的问题,借鉴强化学习理论,提出了多兵种交战兰彻斯特方程中作战指数迭代计算方法,利用作战指数和火力分配策略的递推关系,循环更新作战指数直至结果收敛,重点考察了固定更新率、梯度指数递减方法和动量梯度方法对迭代收敛性的影响,通过调节更新率、递减强度和动量强度等超参数取值,显著提高了迭代收敛速度和稳定性.     

A reusable planar triggered spark-gap switch batched-fabricated with PCB technology for medium-and low-voltage pulse power systems

Triggered spark-gap switch is a popular discharge switch for pulse power systems. Previous studies have focused on planarizing this switch using thin film techniques in order to meet the requirements of compact size in the systems. Such switches are one-shot due to electrodes being too thin to sufficiently resist spark-erosion. Additionally, these switches did not employ any structures in securing internal gas composition, resulting in inconsistent performance under harsh atmospheres. In this work, a novel planar triggered spark-gap switch (PTS) with a hermetically sealed cavity was batched-prepared with printed circuit board (PCB) technology, to achieve reusability with low cost. The proposed PTS was inspected by micro-computed tomography to ensure PCB techniques meet the requirements of machining precision. The results from electrical experiments demonstrated that PCB PTS were consistent and reusable with lifespan over 20 times. The calculated switch voltage and circuit current were consistent with those derived from real-world measurements. Finally, PCB PTS was used to introduce hexanitrostilbene (HNS) pellets in a pulse power system to verify its performance.     

Transverse relaxation characteristic and stress relaxation model considering molecular chains of HTPB coating based on pre-strained thermal aging

In order to accurately describe the transverse relaxation characteristic and stress relaxation modulus of HTPB coating during pre-strain thermal aging process, a one month thermal aging test was carried out at 70 C with pre-strain of 0％, 3％, 6％ and 9％, respectively. The low-field 1H NMR and stress relaxation modulus tests were carried out for HTPB coating at different aging stages. The stress relaxation model considering the molecular chains was proposed according to the changes of crosslinking chain and dangling chain of HTPB coating during pre-strain aging. The results showed that with the increase of aging time, the decay rate of transverse relaxation curve became faster, the transverse relaxation time decreased, the value of combined parameter qMrl increased, the proportion of crosslinking chain decreased, while the proportion of dangling chain increased. Moreover, the stress relaxation modulus increased, the crosslinking network structure of HTPB coating became denser and the degree of cross-linking increased. At the initial aging stage, the pre-strain will destroy the crosslinking network structure of HTPB coating to a certain extent. With the increase of aging time, the effect of pre-strain will gradually weaken and the influence of aging on materials will gradually increase. The correlations between the stress relaxation model considering the molecular chains and the test results were more than 0.9950, which can accurately describe the stress relaxation modulus of HTPB coating during the pre-strain thermal aging process.     

进度风险的随机网络建模与仿真分析

为研究装备研制工程进度的风险分布特征,建立了包含正态分布、β分布、三角分布的随机网络进度风险分析模型,通过蒙特卡罗法仿真获得工程项目的进度估计及其统计分布特性,从而获得工程总工期的风险,并结合实例进行了分析.     

初相未知信号联合检测与估计的序贯实现

在未知参数的充分统计量和再生概率密度函数的基础上,引入了联合检测与估计的序贯算法,给出了算法的实现框图,并将该算法应用于高斯噪声中初相位未知信号的联合检测与估计当中.仿真实验表明,新算法较传统算法有一定的性能改善.     

子母深弹反鱼雷攻击效能及仿真

火箭深弹是水面舰艇拦截鱼雷的常用武器,为提高火箭深弹拦截鱼雷的概率,提出了子母深弹的概念,将地面火炮中常用的子母弹技术应用于深弹反鱼雷攻击中,通过分析子母弹的散布特性,来比较子母深弹和火箭深弹毁伤鱼雷的效能,并通过Monte-Carlo法仿真了这一过程,分析了影响子母深弹的毁伤概率的因素。     

公安现役部队院校建构心理调控机制探析

当前公安现役部队院校开展心理调控工作日益成为人们关注的焦点,它关系到和谐警营的创建、学员心理品质的优化和部队战斗力的提高等重大现实问题。为此,必须建构公安现役部队院校心理调控机制,从领导、内容、管理和运行等方面规范公安现役部队院校的心理调控工作,以促进公安现役部队院校的全面建设。     

网络游戏赌博性质分析

网络游戏产业快速发展的同时,赌博现象混迹其中。网络游戏赌博与传统赌博只是形式上的不同,其实质就是一种赌博行为。只有从教育、法制、监督、自律四方面综合治理,才能使这个行业健康发展。     

基于深度强化学习潜艇攻防对抗训练指挥决策研究

潜艇和水面舰艇编队间的攻防对抗是潜艇作战研究的重点内容,如何确保潜艇在舰艇编队、反潜直升机等兵力的联合封锁下存活和突围,是对潜艇指挥决策的考验.为此,针对潜舰机博弈对抗场景,从深度强化学习和规则推理两个方面构建潜艇智能体,提出两种近端策略优化(Proximal Policy Optimization,PPO)算法改进机...