Bi‐objective missile rescheduling for a naval task group with dynamic disruptions

This paper considers the rescheduling of surface‐to‐air missiles (SAMs) for a naval task group (TG), where a set of SAMs have already been scheduled to intercept a set of anti‐ship missiles (ASMs). In missile defense, the initial engagement schedule is developed according to the initial state of the defensive and attacking units. However, unforeseen events may arise during the engagement, creating a dynamic environment to be handled, and making the initial schedule infeasible or inefficient. In this study, the initial engagement schedule of a TG is assumed to be disrupted by the occurrence of a destroyed ASM, the breakdown of a SAM system, or an incoming new target ASM. To produce an updated schedule, a new biobjective mathematical model is formulated that maximizes the no‐leaker probability value for the TG and minimizes the total deviation from the initial schedule. With the problem shown to be NP‐hard, some special cases are presented that can be solved in polynomial time. We solve small size problems by the augmented ? ‐ constraint method and propose heuristic procedures to generate a set of nondominated solutions for larger problems. The results are presented for different size problems and the total effectiveness of the model is evaluated.     

零压式高空气球球形设计与参数敏感性分析

高空气球能够为临近空间科学实验提供可靠的平台,其形状直接关系到气球制作及飞行的全过程。提出将多段打靶法与序列二次规划法结合,对零压气球完全膨胀和部分膨胀状态下的球形进行求解,并运用有限元方法对球形进行稳定性及应力应变分析,验证了所推导球形的正确性。在此基础上,对影响气球形状的关键参数进行灵敏度分析及相关运用,从定量的角度得到气球载荷、飞行高度及昼夜温差对气球形状的影响规律。     

基于多通道卷积神经网络的磁性舰船目标运动参数估计

传统磁性目标运动估计效果依赖于目标的初始状态信息,为克服这一缺陷,建立磁性运动目标三分量投影模型,并据此生成磁性舰船运动目标在运动速度、航向、信噪比等参数变化情况下的10类目标的训练数据集、验证数据集以及测试数据集。设计多通道卷积神经网络,对目标的正横距离和运动速度进行估计,并比较和分析了不同的学习方式和激活函数对网络性能的影响。结果表明:Adam+tanh组合方式的估计性能要优于其他组合方式,而且对磁性目标运动参数的估计效果比较精确,此方法相较于卡尔曼滤波、粒子滤波等估计算法的优越性在于运算复杂度低以及参数估计不需要目标初始状态信息。     

【将军论坛】重要经济目标与矢量防护工程

重要经济目标是信息化战争首选的打击对象,这类目标绝大多数位于地面以上,特点突出、规模庞大、难以保密、易损性强,一旦遭受破坏后果将损失惨重,而依靠建造硬壳抵御弹药毁伤的传统防护工程对其难有大的作为。本文从新形势下重要经济目标防护陷于困局的实际出发,系统分析和梳理了传统防护工程和防护技术的特点及其应用的固有薄弱特征,提出矢量防护的创造性解决方案,为重要经济设施和预警设施、新型作战装备等位于地面的易损性目标提供了理论基础。矢量防护工程通过改变弹药的运动方向,避免弹药与目标交汇,将防护工程由“拳击式”硬顶变为“太极式”破解,为未来我国重要经济目标提供了新质防护技术。     

Path planning for moving target tracking by fixed-wing UAV

For the automatic tracking of unknown moving targets on the ground, most of the commonly used methods involve circling above the target. With such a tracking mode, there is a moving laser spot on the target, which will bring trouble for cooperative manned helicopters. In this paper, we propose a new way of tracking, where an unmanned aerial vehicle (UAV) circles on one side of the tracked target. A circular path algorithm is developed for monitoring the relative position between the UAV and the target considering the real-time range and the bearing angle. This can determine the center of the new circular path if the predicted range between the UAV and the target does not meet the monitoring requirements. A transition path algorithm is presented for planning the transition path between circular paths that constrain the turning radius of the UAV. The transition path algorithm can generate waypoints that meet the flight ability. In this paper, we analyze the entire method and detail the scope of applications. We formulate an observation angle as an evaluation index. A series of simulations and evaluation index comparisons verify the effectiveness of the proposed algorithms.     

Attitude deflection of oblique perforation of concrete targets by a rigid projectile

A perforation model is developed to predict the attitude deflection in the oblique perforation of concrete targets by a rigid projectile, in which the inertial moment of the projectile is introduced, together with taking the attitude deflection during the shear plugging sub-stage into account, and the shape of the plug formed on the rear surface of target is also re-investigated. Moreover, a new classification of concrete targets is proposed based on the target thickness, with which the attitude deflections in different kinds of concrete targets are analyzed. It is found that the numerical results by using the new perforation model are in good agreement with the previous experimental data and simulated results. Furthermore, the variations of the attitude deflection with the initial conditions (the initial attitude angle and the initial impact velocity) are investigated.     

球头弹低速斜侵彻下薄板穿甲破坏机理研究

为探讨球头弹低速斜侵彻下靶板的破坏机理,通过系列弹道试验,对比分析了不同初始速度下弹体的变形,靶板的破坏模式,以及靶板的破口大小及形状;同时采用ANSYS/LS-DYNA对弹靶作用过程进行了数值模拟。结果表明：低速斜侵彻下靶板响应非完全对称,根据受力特征可将靶板划分为四个不同区域,即接触区,弯曲区,拉伸区和对称区;薄板的穿甲破坏可分为四个不同的阶段,即隆起变形,碟形变形,弯曲变形,弹体贯穿阶段;不同初始速度下靶板出现四种典型的穿甲破坏模式,随着初始速度的增加依次为隆起—碟形变形,隆起—碟形变形—拉弯撕裂破坏,隆起—碟形变形—拉弯剪切破坏,隆起—拉弯剪切破坏。斜侵彻下靶板破口形状为椭圆形,随着初始速度的增加,破口长径不断减小,形状由椭圆形向卵形过渡。     

运动视觉平台点目标定位误差分析和平台最优运动轨迹设计

对运动视觉平台点目标定位问题进行了研究,介绍了基于视觉共线方程的目标定位方法,分析了共线方程关于视线约束的实质。在观测视线相关坐标系推导了视线方向角矢量对目标定位误差的影响规律,分析了多观测对定位误差的影响,并基于最小化目标定位误差推导了视觉平台的最优运动轨迹,利用简单明了的分析方法得到了与已有文献优化Fisher信息矩阵方法一致的结论。利用仿真和试验对定位误差和最优轨迹进行了验证,证实了定位误差理论分析和最优运动轨迹设计的正确性。     

舰空武器主要作战对象的特性及其模拟

了解主要作战对象的特性是舰空武器设计、试验必要的前提,也是空中靶标建设的关键,文章对此进行了归纳分析,提出了模拟这些特性的关键点,为舰空武器设计与试验、空中靶标设计与实现提供基本的结论。