同轴均匀消磁线圈对坦克磁场影响效应的数值模拟

通过数值处理和计算机模拟,得出一种排布方式的消磁线圈对坦克磁场的影响效应分布,即当消磁线圈为均匀密排情形时,线圈内部为匀强磁场,方向沿通电线圈的轴向,且与环形电流呈右手螺旋关系;线圈外部为磁偶极子场,该场会随着与线圈中心距离的增大而迅速减小。数值模拟的结果可为封闭型军事装备表层安装消磁线圈提供参考;通过分析消磁线圈附加磁场的特点为装备磁防护理论提供一些支持。     

共享经济视域下的军事训练场地整合

军改以来,"军委管总、战区主战、军种主建"的格局打破了原有军事训练场地的建设、管理和使用模式,训练场地需求旺盛,缺口较大,急需构建适应新体制新机制的新型训练场地建设管理体系,满足训练需求。本文分析了当前军事训练场地建设管理中存在的问题,提出了基于共享经济模式整合军事训练场地资源的对策措施。     

An eikonal equation based path planning method using polygon decomposition and curve evolution

Path planning is a key technique of autonomous navigation for robots, and the velocity field is an important part. Constructing velocity field in a complex workspace is still challenging. In this paper, an inner normal guided segmentation algorithm in a complex polygon is proposed to decompose the complex workspace in this paper. The artificial potential field model based on probability theory is then used to calculate the potential field of the decomposed workspace, and the velocity field is obtained by utilizing the potential field of this workspace. Path optimization is implemented by curve evolution, during which the internal force generated in the smoothing process of the initial path by a mean filter and the external force is obtained from the gradient of the workspace potential field. The parameter selection principle is deduced by analyzing the influence of several parameters on the path length and smoothness. Simulation results show that the designed polygon decomposition algorithm can effectively segment complex workspace and that the path optimization algorithm can shorten and smoothen paths.     

液氧甲烷膨胀循环变推力发动机系统方案对比研究

当前对液氧甲烷膨胀循环变推力火箭发动机的研制难点和关键技术认识不够清楚,尤其是在大变比推力调节方案方面。基于整个发动机系统,采用理论计算方法,探讨甲烷膨胀做功能力以及变推力调节方案可行性。分别给出了单涡轮系统方案和双涡轮系统方案,首次给出了不同工况下详细的系统状态参数分布,进行了对比分析,并探讨了甲烷做功能力随室压的变化规律。研究结果表明,甲烷做功能力随着室压的减小呈现先减小后增大的趋势,单涡轮和双涡轮系统方案均能够实现大范围推力调节;相比单涡轮方案,双涡轮方案能够更好地保证混合比,且甲烷气体做功能力利用效率更高,氧涡轮和燃料涡轮功率变化范围较窄,涡轮所处环境较为缓和,因此双涡轮系统方案具备一定优势。     

基于深度神经网络的无线覆盖预测算法*

为保证新一代移动无线网络能够根据实时覆盖情况动态地调节小区天线参数,需要实现高效且准确的无线覆盖预测。传统的求解方法通过精确的场强预测来判断天线参数的优劣,虽然精度很高但需要大量的计算资源,无法满足5G和后5G移动网络通过实时覆盖预测进行射频参数动态调整的实际需求。现采用基于深度神经网络的算法对给定天线参数的覆盖效果进行预测,以取代对目标区域的精确场强预测。数值结果表明,该方法能够在保持计算准确性的同时显著减少计算量,为5G动态网络规划提供基础性参考数据。     

海水电场受物体电导率及其形状影响分析

海水中电场测量体会对目标电场产生影响,为了提高电场测量的准确度,利用有限元分析的方法研究了物体对海水电场分布的影响因素,并确定畸变电场的分布规律。仿真结果表明:海水电场畸变峰值大小及其畸变区域受物体的电导率及其形状影响,物体电导率小于或大于海水电导率时对电场分布的影响截然相反,物体形状的曲率越大,电场畸变的峰值越大,但畸变区域越小。     

电偶腐蚀下非稳态扩散瞬时静电场分析

为分析在浓差极化条件下非稳态过程中的静电场分布情况,在斐克第二定律的基础上利用拉普拉斯变换求解电极表面氧浓度随时间的变化。通过法拉第定律分析受氧浓度控制下的电偶腐蚀电流密度,在此基础上利用电流元模型求解电解质溶液中任意位置处产生的瞬时电位及静电场强度,并通过实验验证结果的正确性。结果表明：浓差极化下的非稳态扩散传质产生的静电场及电位会随着时间的增加而逐渐减小,并最终达到稳态,且电流密度会随着氧的浓度减小而减小。     

舰船腐蚀电场建模及补偿最优解验证

基于等效偶极子法,从补偿偶极子长度、角度、大小三方面给出了任意角度的补偿偶极子场解析式,再利用电荷矢量叠加原理,建立了"腐蚀偶极子+补偿偶极子"电场模型。仿真以单轴桨船为例,先验证"腐蚀偶极子+补偿偶极子"电场模型的正确性,再进行补偿偶极子对舰船电场的影响验证,从而得出补偿最优解。模拟实验结果表明,补偿阳极在工程允许条件下距离补偿系统接船端最远处,且补偿系统平行于水平面和船体时补偿效果最优;在补偿最优条件下,理论上是可以抵消原舰船腐蚀电场的。     

MATLAB神经网络的舰船磁场强度估算

舰船磁场建模常采用的方法有谐波分析、磁体模拟和有限元等方法,但普遍存在通用性不强和计算复杂等缺点.为了方便快捷地对舰船磁场强度进行估算,通过梳理影响舰船磁场强度的主要因素,利用神经网络的方法建立估算模型,网络学习采用MATLAB环境下的改进BP算法,网络训练时间短,从仿真的结果来看,估算模型具有估算精度高、通用性强的特点,补充了舰船磁场建模方法.     

Did the Russian General Staff experiment with free play during VOSTOK-2018?

The VOSTOK-2018 strategic field training exercise (FTX) that took place in mid-September 2018 rehearsed forces’ integration and combat preparedness across multiple strategic directions. Regarding combat readiness, the research question outlined in this paper relates to whether the General Staff experimented with mission-command - a key component of Russia’s modern military thinking. The answer is clearly no: operational creative manoeuvring hardly featured during the VOSTOK-2018 drills for clearly identified reasons. At the systemic level, little room was left for initiatives since the drills focused on implementing and testing command and control (C2) systems. At the structural level, VOSTOK-2018 was not oriented towards mission-command but ‘mission-control’ and streamlining centralised decision-making processes down to the tactical level. At the symbolic level, free play was not exercised due to the participation of China in the drills, and the necessity to impress Chinese military observers.