Effect of Drying on Particle Size and Sensitivities of Nano hexahydro-1,3,5-trinitro-1,3,5-triazine

Nano hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) was prepared using a bi-directional rotation mill and dried under different conditions (liquid, temperature and drying). It shows that the samples cake seriously and the particles grow up obviously by ordinary drying in different liquids at 70 °C, which occurs again after vacuum drying. With the increase of temperature, the degrees of caking and aggregation are enhanced. Well dispersed sample maintaining constant particle size is extracted by supercritical drying, especially freeze drying. Furthermore, the mechanical sensitivities of I-RDX, O-RDX and F-RDX, of which the average sizes are 88.03 μm, 15.32 μm and 0.16 μm, respectively, are evaluated. Compared with I-RDX, the friction, impact and shock sensitivities of O-RDX are slightly lower. However, the friction, impact and shock sensitivities of F-RDX are reduced by 30%, 99.0% and 59.9%, respectively.     

天基光学短弧观测约束域的粒子群优化定轨方法

针对空间目标定轨问题,提出一种利用两段天基光学短弧观测数据的粒子群优化定轨新算法。在介绍天基光学短弧观测测量帧集、测量约束域及目标函数构造的基础上,为解决已有的基于网格搜索思想寻优的算法存在的多解、局部最优解及运算量过大等问题,提出了一种利用粒子群优化算法在约束域内对目标函数值寻优达到定轨目的的新算法。对算法的性能进行了仿真验证。多次仿真结果表明:该算法大大降低了计算量,且有效地解决了目标函数多解和局部最优解问题,对目标定轨的精度与定轨算法的克拉美罗下限接近。     

气液同轴式喷嘴雾化特性的试验

通过试验研究气液同轴直流式和气液同轴离心式喷嘴的雾化性能。研究表明:喷嘴出口扩张时可以改善喷嘴的雾化性能;气液同轴直流式和气液同轴离心式喷嘴都存在一个合适的缩进长度,在改善喷嘴雾化特性的同时对总流量影响较小;在相同条件下,气液同轴离心式喷嘴的喷雾性能要优于气液同轴直流式喷嘴的喷雾性能。     

基于松弛序列凸优化的轮式机器人协同轨迹规划

针对威胁环境下的多智能体协同轨迹规划问题,以轮式机器人为对象,研究了基于序列凸优化方法的协同轨迹规划方法.首先通过对轮式机器人模型的分析,给出单独轮式机器人实际物理约束,同时以状态量、控制量加权为性能指标,考虑运动学方程、避障避碰约束、个体物理性能约束、终端约束,建立多轮式机器人协同轨迹规划问题;其次,对运动学方程、避...     

Characteristics structure analysis on debris cloud in the hypervelocity impact of disk projectile on thin plate

In this paper, the gauge points setting is introduced in the SPH simulation to analyze the debris cloud structure generated by the hypervelocity impact of disk projectile on thin plate. Compared with the experiments, more detailed information of the debris cloud structure can be classified from the numerical simulation. However, due to the solitary dispersion and overlap display of the particles in the SPH simulation, accurate comparison between numerical and experimental results is difficult to be performed. To track the velocity and spatial distribution of the particles in the debris cloud induced from disk and plate, gauge points are locally set in the single-layer profile in the SPH model. By analyzing the gauge points’ spatial coordinate and velocity, the location and velocity of characteristic points in the debris cloud are determined. The boundary of debris cloud is achieved, as well as the fragments distribution outside the main structure of debris cloud.     

防空导弹实时优化射表计算的延拓法

文章给出防空导弹轨道实时优化射表的计算方法。首先介绍最优轨道对参数的连续依赖性和优化算法的算法模型的收敛性理论。特别对于每条最优轨道存在一个吸引区域 D* ,使得只要初始迭代轨道属于这个区域 ,由算法模型构造的轨道序列将收敛到所要的最优轨道。根据这个理论 ,设计了计算射表的延拓法。理论证明和计算实践证实由这种算法能有效地计算为实时优化提供初始迭代值的射表     

果蝇算法优化的相关向量机在电子装备中的应用

针对电子装备渐变故障预测问题,提出一种基于果蝇算法优化相关向量机的故障预测方法。该方法将原始时间序列数据进行相空间重构处理,并基于折交叉验证和果蝇算法优化相关向量机模型的核函数参数,从而建立故障预测模型,并以某型雷达发射机速调管监测数据对模型性能进行了验证。实验结果表明,相比已有方法,该方法在全局优化、收敛速度、预测精度以及预测可靠性方面都具有一定优势。     

时序驱动的详细布局方法

针对超大规模集成电路布局过程中时序优化问题,提出一种时序驱动的详细布局方法。对设计进行时序分析并获取时序违反路径集合,对路径上两个连续固定单元间的线网进行平滑处理,以减小路径曲折度以及减少线长。再针对每一个可移动单元与其相邻的线网建立二次规划时序模型,求解局部最优布局位置。对于给定的测试电路,实验结果表明,最差的时序违反与总的时序违反均有明显改善,采用ICCAD2015竞赛的测试模板和评价方法,总的时序性能有45~350 min的提升。     

基于多传感器优化布站的干扰目标定位模型

提出了传感器的优化部署模型 ,利用多传感器对干扰目标实现三角交叉定位 ,并给出了选择用于定位的传感器的数学模型。     

防御阵地火力编成一种静态评估方法和优化模型

提出了防御阵地火力编成的建模思想、要素体系,并得到了相应的权重值,分析了地形对火力发扬的影响,建立了各种火器的等效关系式,找到了各参量的计算方法,对多种参量用模糊评判的方法进行分级、综合和评判。不仅能评价各级火力阵地的优劣,而且能对火力阵地进行优化,组合和配系。