INTELLIGENT DECISION ALGORITHM FOR FAULT DETECTION AND ITS APPLICATION

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履带车辆下长坡液力辅助制动控制策略仿真研究

针对履带车辆下长坡制动过程中不同制动力的分配关系,在液力减速器和整车下坡动力学分析的基础上,研究了基于液力辅助制动的履带车辆下长坡制动控制策略,建立了基于SIMULINK的履带车辆整车动态仿真模型,对液力减速器的持续制动性能和控制策略的有效性进行了仿真．结果表明,车辆下坡持续制动时,适时应用液力减速器,能够有效分流整车制动功率,明显降低机械制动器的工作负荷,满足整车安全恒速下坡的要求．     

基于云理论的装备技术状态预测

通过分析装备技术状态变化的模糊性和不确定性等特性,提出了基于云理论的装备技术状态预测模型.根据装备技术状态劣化趋势,给出了基于云模型的时间序列状态预测方法,有效地运用了装备状态评估中的主观预测知识.将历史趋势与当前趋势相结合,实现了基于时间序列的状态预测.最后以某装备的发动机为研究对象,对发动机状态的动态评估值进行了预测,验证了该状态预测方法的有效性.     

舰舰协同防空的舰空导弹杀伤区分析

针对舰艇编队协同防空时的耦合杀伤区形状及纵深等问题进行了研究,以定量地对编队耦合杀伤区进行简化描述。分析了单舰对典型目标的杀伤区特性,探讨了舰艇编队的典型防空队形,研究了纵向上递阶多层次、横向上同阶耦合的"递阶封闭圈原理"。以一阶耦合杀伤区为重点,依据攻击目标的不同,将其分成相对航路捷径为零和相对航路捷径均非零两类情况建立了耦合杀伤区纵深的计算模型,并扩展到了高阶耦合的情况。研究了耦合杀伤区与舰舰间距和来袭目标进攻舷角等参数的相互关系以及灵敏度。结果表明建立的模型符合实际,具有一定的指导意义。     

机动目标建模及机动检测算法

为解决机动目标跟踪问题,建立了非机动(匀速直线运动)和机动目标当前统计两种动态模型,并对机动目标当前统计模型的输入控制的估计进行了适当改进.同时对非机动模型的观测残差和机动模型的输入估计进行检验,以便准确检测目标机动.     

基于过载的制导炮弹非线性控制系统设计

针对制导炮弹模型中的非线性和耦合性,提出一种基于过载的制导炮弹非线性控制系统设计方法,建立了炮弹的过载时变模型,在俯仰和偏航通道控制器设计过程中加入了一阶低通滤波器,消除了“计算膨胀”的难题,并通过非线性阻尼项消除外界扰动,最后由Lyapunov理论证明了系统是半全局域渐近稳定的,能准确跟踪指定过载。     

远程火炮密集度试验多组数据的处理方法

远程火炮密集度试验需要进行多次射击,同一试验条件下的多组数据通常认为来源于同一分布,但却未见于证明。利用统计检验方法,给出了对试验数据方差齐性及均值相等性的检验方法,并在多组试验数据一致性的基础上给出了试验数据均值、方差的无偏估计,同时在既定置信度下给出了其置信区间,为远程火炮精度检测提供了工具。     

火灾区域模拟原理及CFAST软件应用

分析火灾区域模型的理论基础 ,介绍CFAST软件的功能及操作 ,并应用该软件对某建筑物二楼舞厅的火灾安全性进行评估     

AMT换挡过程动力学建模及换挡品质影响因素分析

建立了AMT车辆换挡过程动力学模型,并对换挡过程各阶段进行了动力学分析,找出了影响换挡品质的主要因素。得出挂挡阶段和离合器接合阶段是产生换挡冲击和滑磨功的主要阶段,其中离合器接合阶段是换挡品质控制的重点,最后给出了提高AMT车辆换挡品质的具体措施。     

Effects of nano-sized aluminum on detonation characteristics and metal acceleration for RDX-based aluminized explosive

Nano-sized aluminum(Nano-Al)powders hold promise in enhancing the total energy of explosives and the metal acceleration ability at the same time.However,the near-detonation zone effects of reaction between Nano-Al with detonation products remain unclear.In this study,the overall reaction process of 170 nm Al with RDX explosive and its effect on detonation characteristics,detonation reaction zone,and the metal acceleration ability were comprehensively investigated through a variety of experiments such as the detonation velocity test,detonation pressure test,explosive/window interface velocity test and confined plate push test using high-resolution laser interferometry.Lithium fluoride(LiF),which has an inert behavior during the explosion,was used as a control to compare the contribution of the reaction of aluminum.A thermochemical approach that took into account the reactivity of aluminum and ensuing detonation products was adopted to calculate the additional energy release by afterburn.Combining the numerical simulations based on the calculated afterburn energy and experimental results,the param-eters in the detonation equation of state describing the Nano-Al reaction characteristics were calibrated.This study found that when the 170 nm Al content is from 0％to 15％,every 5％increase of aluminum resulted in about a 1.3％decrease in detonation velocity.Manganin pressure gauge measurement showed no significant enhancement in detonation pressure.The detonation reaction time and reaction zone length of RDX/Al/wax/80/15/5 explosive is 64 ns and 0.47 mm,which is respectively 14％and 8％higher than that of RDX/wax/95/5 explosive(57 ns and 0.39 mm).Explosive/window interface velocity curves show that 170 nm Al mainly reacted with the RDX detonation products after the detonation front.For the recording time of about 10 μs throughout the plate push test duration,the maximum plate velocity and plate acceleration time accelerated by RDX/Al/wax/80/15/5 explosive is 12％and 2.9 μs higher than that of RDX/LiF/wax/80/15/5,respectively,indicating that the aluminum reaction energy significantly increased the metal acceleration time and ability of the explosive.Numerical simulations with JWLM explosive equation of state show that when the detonation products expanded to 2 times the initial volume,over 80％of the aluminum had reacted,implying very high reactivity.These results are significant in attaining a clear understanding of the reaction mechanism of Nano-Al in the development of aluminized explosives.