状态X~2检验法在联邦滤波器中的应用

针对联邦滤波器的特殊性,基于残差故障统计检验原理,详细研究了状态检验法应用时存在的几个问题。由于信息分配,造成子滤波器局部估计次优,从而基于残差的故障统计检验方法不能够直接使用;针对这一问题,修正了残差方差阵的计算方法,并提出一种次优自适应补偿方法,能够有效改善局部估计次优性对故障检测灵敏度的影响。最后的仿真结果表明了研究的有效性和可行性。     

关于机枪加速寿命试验的建模

通过建模的方法和试验数据对机枪加速寿命试验进行研究,探索并建立三种加速寿命试验映射模型。通过对机枪枪管参数变化与射击规范、射弹量变化关系的理论研究,为加速寿命模型的建立提供理论依据,并对所建立模型进行修正和改进。     

武器系统软件靶场测试方法

从软件测试在软件开发过程中的作用出发,阐述了软件测试在武器系统研制试验与鉴定过程中的重要地位,指出武器系统在靶场进行试验过程中,对武器系统软件进行系统测试的重要性。根据靶场的实际条件和武器系统在靶场进行试验时武器系统软件具有的特点,基于现代软件测试理论和软件测试方法,研究探讨了在靶场这一特殊的环境下对武器系统软件进行系统测试的试验方法和进行测试的系统步骤,对武器系统软件的靶场测试具有重要的指导意义。     

杀伤爆破弹在反坦克作战中的应用

分析了坦克装甲防护系统与反坦克武器系统的现状和发展趋势,提出了以杀伤爆破弹反坦克的思想,分析了杀伤爆破弹反坦克的可行性和毁伤机理,并通过试验进行了验证,提出了测试杀爆弹的破片和冲击波综合毁伤效果的方案,对我军反坦克武器的发展具有一定的借鉴意义。     

基于ER模型的装备训练考核系统建模

随着部队新型装备的不断增加,与此相关的针对装备保障人员的训练及考核的方法、手段却未能及时跟上装备发展的速度,直接影响了新型装备的效能发挥,装备训练考核系统应运而生.在详细分析ER模型的建模规范及一般流程的基础上,针对装备训练考核系统整体功能需求,按照ER模型建模的流程,分别对装备知识学习模块、装备操控技能训练模块和装备考核模块进行了局部ER模型设计,最后将局部ER模型整合为系统整体ER模型.     

金属橡胶阻尼板简支结构性能实验研究

采用等效线性化法来分析金属橡胶粘性阻尼双线性迟滞模型,得出了新的等效刚度与阻尼的变化规律,并用金属橡胶阻尼板简支结构谐振实验进行了验证,为金属橡胶材料的运用提供了依据。     

Matlab在装甲车发动机性能试验数据处理中的应用

数据处理是发动机特性试验的一个重要内容,是测取发动机各项指标,进行动力性、经济性分析的前提和基础。利用Matlab强大的数据处理功能和绘图功能对发动机的性能试验数据进行处理,并采用神经网络学习发动机外特性曲线的方法得到曲线,既提高了工作效率,又可得出较为精确可靠的动机外特性曲线。     

Influence of multiple structural parameters on interior ballistics based on orthogonal test methods

Influence of multiple structural parameters on the performance of a gun launch system driven by high-pressure reactive gases is important for structural design and performance adjustment. A coupled lumped parameter model was utilized to predict the propellant combustion, and a dynamic finite element method was applied to approximate the mechanical interactions between the projectile and the barrel. The combustion and the mechanical interactions were coupled through a user subroutine interface in ABAQUS. The correctness and the capability of the finite element approximations in capturing small structural changes were validated by comparing predicted resistance with experiments. Based on the coupled model, the influence of structural parameters of a medium-caliber gun on the system performance was investigated. In order to reduce the research costs, orthogonal tests were designed to investigate the comprehensive effects of the parameters. According to statistical analysis, the important order of the structural parameters on the launching process was obtained. The results indicate that the influence of the width of the rotating band stands out among the studied parameters in the gun. The work provides a method to investigate the influence of multiple parameters on system performance and gives guidance for controlling the system performance.     

Experimental investigations on wear properties of Palm kernel reinforced composites for brake pad applications

The use of asbestos material is being avoided to manufacture the brake pads as it is harmful and toxic in nature. Further it leads to various health issues like asbestosis, mesothelioma and lung cancers. These brake pads can be replaced by natural fibers like Palm kernel (0–50%), Nile roses (0–15%) and Wheat (0–10%) with additives like aluminum oxide (5%–20%) and graphite powder (10%–35%). Phenolic resin of 35% is utilized as a binder. Particulated Nile roses are used to increase the friction coefficient and wheat powder is used to reduce the wear rate. Aluminum oxide and graphite are abrasive in nature. This helps to make brake pads with high friction co-efficient and less wear rate with low noise pollution. The wear of the proposed composites have been investigated at different speeds. Various tests like wear on pin-on-disc apparatus, hardness on the Rockwell hardness apparatus and oil absorption test have been conducted. Phenolic resin produces good bonding nature to fiber. Thus, Fibers found to have performed palatably among all commercial brake pads. The objective of the research indicates that Palm kernal shell could be a conceivable alternative for asbestos in friction coating materials.     

基于步进应力加速老化和改进Arrhenius模型的橡胶贮存寿命预测

为准确、快速地预测橡胶的贮存寿命,在步进高温应力加速老化试验的基础上,对不同加速温度下的加速系数进行计算,获得加速因子和绝对温度倒数的曲线,发现橡胶老化过程表现出非Arrhenius特性。针对非Arrhenius特性,引入幂指数因子,采用一种改进的Arrhenius模型对加速系数进行拟合。由对数反应速率与绝对温度倒数曲线的斜率,计算了改进Arrhenius模型在不同温度下的等效线性活化能,结果表明低温下活化能减小。建立低温下的老化寿命模型,对胶料在10℃,20℃和30℃下的老化寿命进行评估。评估结果表明,该模型可为相关高分子材料腐蚀过程中呈现的非Arrhenius特性的分析及寿命预测提供参考。