信息扩散模型的窗宽优化与鱼雷战术效能实验评估

针对海洋环境对鱼雷等武器装备战术效能影响的试验数据和案例样本匮乏等普遍性问题,引入信息扩和模糊映射思想,并基于遗传算法改进和发展了最优窗宽扩散模型。该方法可从有限的试验样本中客观拟合出数据结构信息,进而实现有限数据样本信息的合理扩散。利用该方法进行了基于小样本案例的潜射鱼雷战术效能的海洋环境影响评估的信息扩散建模和仿真实验和对比分析。结果表明,窗宽优化的信息扩散模型可有效改进常规信息扩散模型的评估效果,对武器装备环境影响评估中普遍存在的小样本或信息不完备困难有一定参考应用意义。     

Investigation of the mechanical and ballistic properties of hybrid carbon/ aramid woven laminates

High-performance ballistic fibers, such as aramid fiber and ultra-high-molecular-weight polyethylene (UHMWPE), are commonly used in anti-ballistic structures due to their low density, high tensile strength and high specific modulus. However, their low modulus in the thickness direction and insufficient shear strength limits their application in certain ballistic structure. In contrast, carbon fiber reinforced epoxy resin matrix composites (CFRP) have the characteristics of high modulus in the thickness direction and high shear resistance. However, carbon fibers are rarely used and applied for protection purposes. A hybridization with aramid fiber reinforced epoxy resin matrix composites (AFRP) and CFRP has the potential to improve the stiffness and the ballistic property of the typical ballistic fiber composites. The hybrid effects on the flexural property and ballistic performance of the hybrid CFRP/AFRP laminates were investigated. Through conducting mechanical property tests and ballistic tests, two sets of reliable simulation parameters for AFRP and CFRP were established using LS-DYNA software, respectively. The experimental results suggested that by increasing the content of CFRP that the flexural properties of hybrid CFRP/AFRP laminates were enhanced. The ballistic tests’ results and the simulation illustrated that the specific energy absorption by the perforation method of CFRP achieved 77.7% of AFRP. When CFRP was on the striking face, the shear resistance of the laminates and the resistance force to the projectiles was promoted at the initial penetration stage. The proportion of fiber tensile failures in the AFRP layers was also enhanced with the addition of CFRP during the penetration process. These improvements resulted in the ballistic performance of hybrid CFRP/AFRP laminates was better than AFRP when the CFRP content was 20 wt% and 30 wt%.     

区块链在车联网中的应用综述

针对当前车联网系统面临的网络安全与可信以及数据大规模同步共享挑战,提出利用区块链技术提升车联网系统的安全性水平与协同共享能力.首先从概念特征与技术架构两个层面对区块链技术进行了整体概述,并结合区块链去中心化存储、共识安全防护、数据不可篡改等特点,探讨了区块链与边缘计算协同应用的互补优势与研究现状.进而从协作同步、安全信...     

舰炮火力系统智能结构分析

遵从“智能增加,精度降低”(IPDI)原则,将舰炮火力系统(含雷达、C~3I、舰炮等系统)的智能结构分为概念、协调、执行3级,并着重分析采用广义信息熵作为各级统一评价标准的可能性。最后,还简要提出了新型舰炮火力系统智能化发展的方向。     

基于神经元的动态系统模糊关系模型及其学习算法

本文直接针对模糊集,提出了三种基于模糊集运算的逻辑神经元,即ＡＮＤ．ＯＲ和ＡＮＤ／ＤＲ．基于上述神经元,提出了一种应用于动态系统建模的实用的模糊关系网络模型,通过一个简单实例,证实了上述模型建模算法的学习能力和快速计算能力。     

MLFMA在运动目标多普勒回波数值仿真中的应用

提出了一种应用准静态技术,结合快速多级子算法计算任意形状的运动目标多普勒信号的方法,对目标的几种典型的微动多普勒信号进行了仿真,并应用高分辨时频分析算法对仿真得到的微多普勒信号进行了分析,提取出了微多普勒瞬时频率,并与相应微动规律的点目标微多普勒瞬时频率进行对比。结果表明,二者具有相同的变化规律,从而证明本文提出的方法是有效的。     

一种混合事件仿真调度算法

针对既含有离散事件,又含有连续事件的高炮防空仿真系统提出了一种混合事件仿真调度算法。通过引入绝对仿真时钟和相对仿真时钟,来完成混合事件仿真调度,该算法简化了事件与活动处理的复杂性。     

采用固液冲压发动机的地空导弹弹道建模

针对采用固液混合冲压发动机的地空导弹弹道设计中出现的新问题, 给出了解决这些问题的弹道设计方法, 并利用弹道仿真对其进行了验证。     

舰船武备系统故障诊断算法的探讨

本文以舰炮系统为主,论述了舰船武备系统在诊断中常用算法的基本原理及其特点,并指出今后进行理论研究的一些可行的途径。     

飞行控制软件导航仿真模型遥测数据注入仿真

研究了飞行控制软件导航仿真模型遥测数据注入仿真中的一些问题,构造了遥测数据输入序列的误差补偿算法,重建相应的输入序列,使得将它们注入到相应的数字仿真模型进行仿真时,得到的输出与飞行试验中弹上计算机发送的遥测数据相符。