切伦科夫辐射的强流电子束均匀性光学诊断

透明介质中带电粒子的运动速度大于介质中的光速时就会产生切伦科夫辐射光。搭建了基于切伦科夫辐射光的强流电子束均匀性诊断系统,实现了时间和空间分辨的纳秒级电子束均匀性光学诊断。利用程序对诊断系统进行设计。在此基础上对两种天鹅绒阴极发射均匀性进行光学诊断测量。结果表明:在相同电参数下,碳纤维天鹅绒较化纤天鹅绒具有更好的发射性能,与之对应的切伦科夫辐射光斑面积更大,其亮度扫描曲线不但中心增强区域较化纤天鹅绒宽,在其边缘附近也有较强的亮度分布;通过分析切伦科夫辐射光斑的分布和强弱的时间分辨图像,可以得到阴极在电脉冲过程中的运行状态,具有10ns~100ns级时间分辨特性。     

火炮身管无损检测方法

为了延长火炮身管寿命,进一步提高射击精度。研究火炮身管缺陷检测技术,结合身管不同的损伤类型,通过比较不同的身管检测方法,讨论它们的优缺点和发展前景,并得出相控聚焦超声导波检测新技术的优越性,应用在火炮身管检测中,可占据优势地位,使其可以更好地投入到军队的实际应用中,提高作战效能。     

基于改进Morison公式的海上漂浮软管波浪载荷计算

针对海上漂浮软管波浪载荷计算,分析了软管在海上的形态和受力特点,建立了海上漂浮软管力学分析模型,指出直接运用现有Morison方程计算漂浮软管波浪载荷存在的不足,并根据基本原理提出了改进Morison方程。对海上软质管线处于一定海况,分别运用改进Morison方程与现有Morison方程计算海上波浪载荷,并运用ANSYS软件建立软管模型,结果表明现有Morison方程不适用于计算海上漂浮软管波浪载荷,载荷计算结果偏高约15%,从而验证了改进Morison方程的精确性,有利于准确分析波浪载荷对海上漂浮软管的作用情况。     

基于转速分析的柴油机加速性能和气缸气密性的评价方法

对不同使用摩托小时的坦克柴油机的加速、减速时间进行检测和分析,利用Bayes Bootstrap模拟统计方法对转速特征值进行处理,获得了更准确的特征分布．采用动态聚类方法对样本特征进行分类,实现了对柴油机加速性能和气缸气密性的等级评价．     

Cell-type continuous electromagnetic radiation system generating millimeter waves for active denial system applications

The cell-type continuous electromagnetic radiation system is a demonstration device capable of generating high-power millimeter electromagnetic waves of a specific wavelength and observing their effects on living organisms. It irradiates a biological sample placed in a 30 × 30 × 50 cm³ cell with electromagnetic waves in the 3.15-mm-wavelength region (with an output of ≥1 W) and analyzes the temperature change of the sample. A vacuum electronic device-based coupled-cavity backward-wave oscillator converts the electron energy of the electron beam into radiofrequency (RF) energy and radiates it to the target through an antenna, increasing the temperature through the absorption of RF energy in the skin. The system causes pain and ultimately reduces combat power. A cell-type continuous electromagnetic radiation system consisting of four parts—an electromagnetic-wave generator, a high-voltage power supply, a test cell, and a system controller—generates an RF signal of ≥1 W in a continuous waveform at a 95-GHz center frequency, as well as a chemical solution with a dielectric constant similar to that of the skin of a living organism. An increase of 5 °C lasting approximately 10 s was confirmed through an experiment.     

Monitoring and Prediction of the Vibration Intensity of Seismic Waves Induced in Underwater Rock by Underwater Drilling and Blasting

All underwater drilling and blasting operations generate seismic waves.However,due to a lack of suitable vibration sensing instruments,most studies on the propagation of seismic waves have been limited to shorelines near construction areas or wharfs,whereas comparatively few studies have been conducted on the larger seafloor itself.To address this gap,a seafloor vibration sensor system was developed and applied in this study that consists of an autonomous acquisition storage terminal,soft-ware platform,and hole-plugging device that was designed to record the blasting vibration intensities received through submarine rocks at a given measurement point.Additionally,dimensional analyses were used to derive a predictive equation for the strength of blast vibrations that considered the in-fluence of the water depth.By combining reliable vibration data obtained using the sensor system in submarine rock and the developed predictive equation,it was determined that the water depth was an important factor influencing the measured vibration strength.The results using the newly derived equation were compared to those determined using the Sadowski equation,which is commonly used on land,and it was found that predictions using the derived equation were closer to the experimental values with an average error of less than 10％,representing a significant improvement.Based on these results,the developed sensor system and preliminary theoretical basis was deemed suitable for studying the propagation behavior of submarine seismic waves generated by underwater drilling and blasting operations.     

复杂条件下飞行器天馈设备关键技术分析

作为高速飞行器载体用户终端的最前级,天馈设备的性能直接关系到无线收发系统数据链路的有效性。从技术应用角度出发,分析了在高速、高温以及复杂电磁环境下天馈设备的设计实现,介绍了热天线、可重构天线、小型化可控波束阵列、自适应阵列等几种先进天馈设备的技术特点和细节,详细阐述了其在高速飞行器载体的工程应用方法,对提高复杂飞行任务条件下数据链路的稳定性具有积极意义。     

基于模态分析方法的管道导波频散曲线计算

推导了管道中导波传播的有限元方程,使用 ANSYS 有限元软件建立了管道模型;对导波进行模态分析,得到了管道模型的一系列特征频率与振型,通过对管道振型的模态识别,提取了管道中各模态导波的模态特征,计算得到了管道中导波的频散曲线,该曲线与解析法所得到的频散曲线相吻合。该方法可以应用于周期性重复组合的任何结构（如横截面固定的杆、板、管）中导波的频散曲线计算。     

基于综合识别的高速飞行器自适应控制方法(英文)

针对高速飞行器的传统自适应控制方法中控制器参数获取时间长,辨识存在收敛性的问题,设计了一种基于综合识别方法的新型自校正控制方案。首先,由在线直接可测量构成特征模型的特征状态量,并以特征模型作为参考模型来设计控制器;其次,通过获得的特征状态量来在线调配对象系统的零极点,输出达到期望性能所需要的控制参数。仿真结果表明:该方法能较理想地实现在线自适应控制,保证系统良好的鲁棒性和快速性,同时在工程上易于实现。     

基于数值模拟的弹药地面库整库燃爆冲击波毁伤风险评估

弹药燃爆事故是我军后方仓库安全管理工作防护的重点,对弹药燃爆事故危害度进行评估,是武器装备安全风险评估体系的重要组成部分.选取地面库整库弹药燃爆事故为研究对象,应用AUTODYN计算程序,建立了弹药地面库的三维空间有限元仿真模型,并对弹药地面库整库爆炸的冲击波传播过程进行了数值模拟,得到了在冲击波不同毁伤等级下人员、建筑物的毁伤区域,为燃爆事故危害度风险评估提供了数据支持.