导弹测试系统中动态激励设备的调速控制与变频器的应用

导弹自动驾驶仪敏感部件功能状态的测试,是导弹实施综合测试内容的重要项目之一。实施敏感部件的测试的前提条件之一,是要有动态激励信号产生。产生动态激励信号的设备是动态激励装置。动态激励装置由驱动电机进行驱动。对驱动调速机构、调速原理以及变频器的应用,做出概要性阐述。     

基于双特征参数解的直杆弹性动力后屈曲研究

利用差分方法求解动力后屈曲非线性方程解,研究了弹性直杆的2类轴向碰撞屈曲问题.将双特征参数解得出的含有小幅值参数的初始动力屈曲模态作为非线性后屈曲解的初始条件.理论计算的结果与文献中的实验数据达到了很好的一致,由此验证了双特征参数方法的正确性.研究结果还揭示了碰撞过程中屈曲变形扩展和发展的机理,以及轴向应力波和屈曲变形的相互作用规律.     

轴向应力波作用下的圆柱壳弹塑性后屈曲

为揭示柱壳屈曲变形的发展机理及屈曲波与弹塑性应力波耦合传播间的关系,运用非线性显示动力学有限元分析方法对承受轴向高速冲击载荷作用下柱壳的弹塑性后屈曲过程进行了研究。分析结果表明:对于柱壳在轴向高速冲击下的弹塑性轴对称动力屈曲,主要屈曲变形发生在柱壳的两端,屈曲变形的产生及发展与应力波在壳中的传播过程密切相关;塑性应力波在整个屈曲过程中起了绝对支配的作用;屈曲波的产生及发展,都与塑性波的传播及反射有关;弹性应力波由于在整个屈曲过程中持续的时间极短,处于次要的地位。     

MILITARY EXPENDITURE AND ECONOMIC GROWTH IN MIDDLE EASTERN COUNTRIES: A DYNAMIC PANEL DATA ANALYSIS

Defence expenditures have both costs and benefits to the economy. The costs of defence expenditures are mainly emphasized as opportunity costs. On the other hand, defence spending may have growth‐promoting potential benefits: a rise in defence spending may result in a higher aggregate demand, production and employment. This paper examines empirically the effects of military expenditures on economic growth for Middle Eastern countries and Turkey, for the time‐period 1989–1999. The relationship between military expenditure and economic growth is investigated by using cross‐section and dynamic panel estimation techniques. Empirical analysis indicates that military expenditure enhances economic growth in the Middle Eastern countries and Turkey as a whole.     

膨润土-砂混合型缓冲／回填材料液塑限试验

为研究掺砂率对高庙子膨润土一砂混合型缓冲／回填材料液塑限的影响,利用液塑限联合测定仪进行了试验研究,并运用最小二乘法对混合物液塑限试验数据进行了分析。试验结果表明膨润土一砂混合物的可塑性、液塑限值和塑性指数均随掺砂率的增大而降低。对试验结果进行分析,得到了考虑掺砂率影响的混合物液塑限经验公式。混合物的液塑限并不是随掺砂率增大成比例降低,而是液限的实测值小于理论值,塑限的实测值大于理论值。得到的不同掺砂率的膨润土一砂混合型缓冲／回填材料液塑限试验数据可为高放废物深地质处置库建设提供科学依据。     

Three-dimensional coordinates test method with uncertain projectile proximity explosion position based on dynamic seven photoelectric detection screen

To objectively obtain the three-dimensional coordinates of the projectile fuze proximity explosion when projectile intersects the head of missile target, we propose a dynamic seven photoelectric detection screen test method, which is made up of six plane detection screens and a flash photoelectric dynamic detection screen. The three-dimensional coordinates calculation model of the projectile proximity explosion position based on seven plane detection screens with dynamic characteristics is established. According to the relation of the dynamic seven photoelectric detection screen planes and the time values, the analytical function of the projectile proximity explosion position parameters under non-linear motion is derived. The projectile signal filtering method based on discrete wavelet transform is explored in this work. Additionally, the projectile signal recognition algorithm using an improved particle swarm is proposed. Based on the characteristics of the time duration and the signal peak error for the projectile passing through the detection screen, the signals attribution of the same projectile passing through six detection screens are analyzed for obtaining precise time values of the same projectile passing through the detection screens. On the basis of the projectile fuze proximity explosion test, the linear motion model and the proposed non-linear motion model are used to calculate and compare the same group of projectiles proximity explosion position parameters. The comparison of test results verifies that the proposed test method and calculation model in this work accurately obtain the actual projectile proximity explosion position parameters.     

考虑抗拉强度的含外倾结构面岩质边坡稳定性分析

当前工程设计都是将边坡失稳破坏看成整体的剪切破坏即M-C剪切破坏,基本不考虑岩土体本身抗拉强度.而岩质边坡真实的破坏应该是张拉-剪切复合破坏,不应是传统不考虑抗拉强度的单一剪切破坏模式.利用FLAC3D软件,基于张拉-剪切复合破坏准则对岩体和结构面强度参数同时进行强度折减,与只考虑抗剪强度的情况进行比较来研究抗拉强度对...     

基于战术数据链的舰空平台动态入网研究

本文在对Link11数据链的基本组网模式分析后,针对该数据链应用中存在的不足,结合近岸防御及近海作战的军事需求,提出了一种通过综合利用现有信息系统实现舰空平台位置锁定及动态入网的方法,仿真结论表明舰空平台动态入网机制可保证平台跨区机动信息的传输连续性、稳定性,保障岸基指挥人员对平台的不间断指挥。     

纳米SiO2改性聚合物锂离子电池的研究

研究了一种基于含氟聚合物的聚合物锂离子电池,考察了SiO2纳米粉对聚合物电解质隔膜的机械性能、吸液量以及电导率的影响,用电镜分析探讨了纳米改性聚合物电解质膜的微观结构;并以此纳米改性聚合物隔膜组装了小型的聚合物锂电池,研究了其电性能.