亥姆霍兹线圈磁场均匀性的研究

推导了亥姆霍兹线圈所产生的磁感应强度的计算公式,利用该公式进行了编程计算,研究了亥姆霍兹线圈在空间所产生的磁场分布规律．以１％均匀度为例给出了磁场均匀区与环半径（距离）之间的关系．     

完善舰船装备维修体制 提高预防性维修水平

分析了海军装备目前的维修现状以及存在的问题,论述了实行视情维修的重要性和必要性,提出了建立以视情维修为主的预防性维修大纲的原则．     

基于小波分析的柴油机燃油系统故障诊断研究

提出了一种基于小波变换的柴油机燃油系统故障诊断方法。利用夹持在高压油管上的传感器对高压油管外壁弹性变形进行检测,在12150L柴油机喷油泵实验台上进行了大量的实验,对测得的高压油管压力波形进行小波变换,提取反映燃油系统故障状态的特征向量,通过特征参数的变化能有效地诊断燃油系统的各种典型故障。     

基于Internet的虚拟博物馆自动生成系统

采用通用的VRML生成器和QuickTime播放器,基于Internet国际互联网环境,通过对国际现有的VRML生成器性能的对比,应用VRML语言,构造出一个虚拟的境界。虚拟博物馆自动生成系统的各个参数均存储在数据库中,需要时可以随时设计博物馆的虚拟场景并与其他应用程序挂接。利用该系统构造的虚拟的境界,使参观者获得与真实博物馆一样的感觉。     

装甲车辆发动机发展综述

介绍了坦克装甲车辆发动机的发展概况,综合论述了我军新装备发动机的主要技术特点和第四代坦克发动机的技术发展趋势.     

软件可靠性数学仿真测试平台设计与研制

针对火控软件的特点和要求,研制出面向软件可靠性验证的数学仿真测试平台,并根据典型的火控程序,有效地完成了分析与测试工作.测试系统界面友好,测试结果达到设计要求.     

Reaction degree of composition B explosive with multi-layered compound structure protection subjected to detonation loading

The explosive reaction degree and protection from explosions are concerns in the military field.In this work,the reaction degree of the composition B explosive was investigated experimentally.Multi-layered compound structures were used as barriers to weaken the blast loads.A comprehensive experiment using a high-speed camera and image processing techniques,side witness plates,and bottom witness plates was presented.Using the experimental fragment velocities,fragment piercing patterns,and damage characteristics,the reaction degree of the explosive impeded by different multi-layered com-pound structures could be precisely differentiated.Reaction parameters of the explosive obstructed by compound structures were obtained by theoretical analysis and numerical simulations.Unlike the common method in which the explosive reaction degree is only distinguished based on the initial pressure amplitude transmitted into the explosive,a following shock wave reflected from the side steel casing was also considered.Different detonation growth paths in the explosive formed.Therefore,all these shock wave propagation characteristics must be considered to analyze the explosive response impeded by compound structures.     

A method to determine the shell layout scheme for equipment battlefield damage tests under artillery fire

In this paper,a new method for determining the shell layout scheme is proposed,which can make the equipment damage data by the battlefield damage test resemble as close as possible the actual combat data.This method is based on the analysis of the impact point distribution and effective damage area of equipment.In order to obtain the position of the impact points,an impact point distribution model under artillery fire was established.Similarly,in order to obtain the effective damage area of equipment,the concepts of generalized damage area and task-based equipment functional damage probability were demonstrated,and the corresponding calculation model was established.Through case analysis,the shell layout scheme was effectively obtained,verifying the correctness of the proposed method.     

Thermodynamics and performance of Al/CuO nanothermite with different storage time

The storage stability of energetic materials is important for its application. Here, the storage stability of Al/CuO nanothermite, which was prepared by electrospray method and stored with different storage time, was systematically researched. The activation energy of Al/CuO nanothermite was calculated by differential scanning calorimetry (DSC). The ignition temperature and the curve pressure history of Al/CuO nanothermite was measured using ignition temperature measuring device and constant-volume pressurization tests, respectively. Further, the thermites were characterized by X-ray Diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM) and Transmission electron microscopy (TEM). The results show that the morphology of the thermites did not change significantly. The activation energy was decreased from 254.1 kJ/mol to 181.8 kJ/mol after storage for 13 months. When stored for 0, 7 and 13 months, the peak pressures of Al/CuO nanothermite were 685.8 kPa, 626.3 kPa and 625.5 kPa, respectively. In addition to the ignition temperature, it was 775 ℃, 739 ℃ and 754 ℃, respectively. This result indicated that the ignition and combustion properties of Al/CuO nano-thermite are obviously reduced when stored for a long time, at room temperature.     

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.