水雷气动不平衡式发射轴向受力优化分析

基于水雷气动不平衡式发射内弹道数学模型,建立了轴向受力和出管速度的泛函表达式,以基本可行解为基准,对可行解区间进行了仿真计算,通过将轴向受力和出管速度函数在基本可行解处一阶泰勒展开,并采用分段函数表示可行解各分量的变化律,从而将非线性问题转化为线性规划问题,运用单纯形法进行优化求解,得到了最优发射条件.     

大口径顶置火炮输弹机动力学研究

为解决大口径顶置火炮弹药自动装填系统的关键技术问题,提出了大口径顶置火炮输弹机各工作阶段的力学模型和动力学方程,并通过输弹速度与时间的计算分析,得到了3种输弹方式的输弹速度与时间关系曲线,其结果对大口径顶置火炮供输弹系统的研究具有较大参考价值。     

Fracture mechanism of a cylindrical shell cut by circumferential detonation collision

The failure mechanism of a cylindrical shell cut into fragments by circumferential detonation collision was experimentally and numerically investigated. A self-designed detonation wave regulator was used to control the detonation and cut the shell. It was found that the self-designed regulator controlled the fragment shape. The macrostructure and micro-characteristics of fragments revealed that shear fracture was a prior mechanism, the shell fractured not only at the position of detonation collision, but the crack also penetrated the shell at the first contact position of the Chapmen-Jouguet (C-J) wave. The effects of groove number and outer layer thickness on the fracture behavior were tested by simulations. When the thickness of the outer layer was 5–18 mm, it has little effect on fragmentation of the shell, and shells all fractured at similar positions. The increase of the groove number reduced the fracture possibility of the first contact position of the C-J wave. When the groove number reached 7 with a 10 mm outer layer (1/4 model), the fracture only occurred at the position of detonation collision and the fragment width rebounded.     

Hypersonic impact flash characteristics of a long-rod projectile collision with a thin plate target

Impact flash occurs when objects collide at supersonic speeds and can be used for real-time damage assessment when weapons rely on kinetic energy to destroy targets.However,the mechanism of impact flash remains unclear.A series of impact flash experiments of flat-head long-rod projectiles impacting thin target plates were performed with a two-stage light gas gun.The impact flash spectra for 6061 aluminum at 1.3-3.2 km/s collision speeds were recorded with a high-speed camera,a photoelectric sensor,and a time-resolved spectrometer.The intensity of the impact flash exhibited a pulse charac-teristic with time.The intensity(I)increased with impact velocity(V0)according to I∝Vn0,where n = 4.41 for V0 ＞ 2 km/s.However,for V0 ＜ 2 km/s,n = 2.21,and the intense flash duration is an order of magnitude less than that of higher V0.When V0 ＞ 2 km/s,a continuous spectrum(thermal radiation background)was observed and increased in intensity with V0.However,for V0 ＜ 2 km/s,only atomic line spectra were detected.There was no aluminum spectral lines for V0 ＜ 2 km/s,which indicated that it had not been vaporized.The initial intense flash was emission from excited and ionized ambient gases near the impact surface,and had little relationship with shock temperature rise,indicating a new mechanism of impact flash.     

基于SWOT分析的军队审计容错免责机制完善路径研究

军队审计容错免责机制是在审计权限范围内对符合容错免责情形的事由减轻或免于问责并及时纠正的稳定工作机制,是审计问责态势下应对“为官不为”问题的合理路径。本文基于SWOT法分析认为,当前审计环境下建立军队审计容错免责机制的优势在于独立的经济监督地位、专业的经济监督力量和广泛的经济监督对象,劣势在于单一的认定主体、缺失的法律规范和匮乏的免责素质,机遇在于利好政策的出台、国家审计的实践经验和军队审计的职能定位,威胁在于制度规范笼统、审计风险扩大和资源矛盾加剧。在此基础上,本研究基于W-T（劣势-威胁）的战略选择,提出完善军队审计容错免责机制的现实路径,即：明确机制定位,科学界定边界;完善制度规范,形成法律依据;完备容错清单,转变审计模式;优化容错环境,降低容错风险。     

纳米粒子在油品中的抗磨性能研究与分析

采用四球试验机研究Cu、Zn(OH)2和PbO3种不同纳米粒子的摩擦性能,探讨纳米粒子在油品中的润滑作用机理。结果表明:纳米粒子在油品中抗磨作用的发挥存在载荷临界点;只有当载荷高于临界载荷时,纳米粒子才能表现出良好的摩擦学性能。     

基于高层滑模的导弹电液伺服机构模糊滑模控制

针对导弹电液伺服机构的跟踪控制问题,设计了一种模糊滑模控制方案。将高层滑模函数作为模糊控制系统的一维输入,简化了一般模糊滑模控制系统结构,从而得到具有少量规则的模糊滑模的设计方案。仿真结果表明了该方案可以减小跟踪误差,增强系统的鲁棒性和削弱控制信号中的高频抖振。     

火炮反后坐装置故障机理研究

反后坐装置是火炮的"心脏",性能好坏直接关系到其战斗力的发挥。节制环磨损及复进机漏液是反后坐装置最常见的故障。分析了节制环磨损和复进机漏液的故障机理,给出了磨损量以及漏液量计算模型。在此基础上,结合火炮后坐、复进反面问题计算程序,模拟计算火炮在节制环磨损和复进机漏液情况下的运动诸元。进而预测在其它射击条件正常情况下,火炮平均无故障射弹发数。     

基于少齿差传动的高精度方向机研究

目前大多数坦克炮塔方向机均采用一行星汇流排将手动与电动合二为一.但由于受到结构及坦克空间约束,方向机的传动比基本上均匀分配,系统各级精度均对系统误差产生影响,因而空回量大、传动精度低,通常在2.5密位以上.本研究通过采用"同力面混合少齿差行星传动"技术及径向弹性补偿装置,并对系统各级传动比重新分配,使方向机的空回量约减小一半,提高了方向机的传动精度和传动效率.     

装甲车辆综合试验检测系统研究

主要介绍了装甲车辆传、操系统多功能综合试验、检测与监控系统的研制及功能,该系统以现代检测手段为基础,可对装甲车辆传、操系统的试验过程进行实时检测和监控,其监控技术指标包括操纵力及行程、温度、噪声、转速、挡位、油压等,同时还可进行试验数据的实时采集,通过计算机进行综合分析和评估,输出试验结果。