装载机动臂结构通用前后置处理系统

本文在ＡＵＴＯＣＡＤ图形环境下，结合装载机动臂的结构特点，采用自动化分单元网格技术，设计了一个适用于微机、操作简单、自动化程度高的有限元前后处理程序，该程序与微机有限元计算软件相结合形成了适于工程人员使用的动臂结构通用有限元分析系统，为有限元技术在轮式装载机动臂设计工作中的广泛应用提供了一个有力工具，并给出了具体的应用实例     

大功率柴油机技术的发展

本文主要介绍了各种不同用途低、中、高速大功率柴油机在结构、性能、排放等方面发展的现状,分析、比较了降低排放的技术措施,以及燃油系统和电子控制系统等的技术发展方向。     

高温抗折试验的应力增加速率问题

本文从标准规定应力增加速率为一恒量出发，根据加荷、应力对时间的函数关系，讨论了抗折仪满足标准要求应具备的测试功能及加荷达率的确定。     

Chaotic responses of curved plate under sinusoidal loading

In the present investigation, the nonlinear dynamic buckling of a curved plate subjected to sinusoidal loading is examined. By the theoretical analyses, a highly nonlinear snap-through motion of a clampedfreeclampedfree plate and its effect on the overall vibration response are investigated. The problem is reduced to that of a single degree of freedom system with the Rayleigh-Ritz procedure. The resulting nonlinear governing equation is solved using Runge-Kutta (RK.-4) numerical integration method. The snap-through boundaries, which vary with different damping coefficient and linear circular frequency of the flat plate are studied and given in terms of force and displacement. The relationships between static and dynamic responses at the start of a snap-through motion are also predicted. The analysis brings out various characteristic features of the phenomenon, i.e. l) small oscillation about the buckled position-softening spring type motion, 2) chaotic motion of intermittent snap-through, and 3) large oscillation of continuous snap-through motion crossing the two buckled positions-hardening spring type. The responses of buckled plate were found to be greatly affected by the snap-through motion. Therefore, better understanding of the snap-through motion is needed to predict the full dynamic response of a curved plate.     

基于OpenGL的军用物资装载仿真系统研究

提出了以VisualC++为开发工具,基于OpenGL技术,开发军用物资装载仿真系统的具体方案。采用数值仿真与可视化技术相结合的方法,建立了军用物资装载模型,对物资装载量与装载方式进行仿真,并得出直观的计算结果,为实际货运装载提供理论依据。     

火箭炮装填训练视景仿真系统的设计与实现

箭炮装填训练是炮兵(火箭炮)部队训练的重要内容.根据炮兵实装训练噪声大、费用高等实际情况,提出了火箭炮装填训练混合仿真系统的总体设计,系统由实物仿真子系统和视景仿真子系统组成.着重介绍了视景仿真子系统的开发过程.利用三维建模软件Multigen Creator采用实时仿真不可缺少的DOF(Degrees of Freedom)技术建立了火箭炮、装填车等几何模型,然后利用Lynx的图形用户界面通过引入建立的几何模型生成运动模型,最后运用MFC通过调用驱动软件Vega函数库来生成实时应用程序.建立的三维模型形象逼真,生成的仿真系统经教学试用效果较好.     

特征统计算法(CSA)在堆芯装料方案优化中的应用

针对压水堆堆芯装料优化问题的特殊性,采用了一种更适合于全局优化算法--特征统计算法来求解.本文阐述了该算法的搜索原理以及如何将其应用于堆芯装料优化问题;编制了装料优化程序SCYCLE,应用该程序在2个不同类型的实际堆芯模型上进行了计算,并与其它算法的计算结果进行了比较.结果表明,SCYCLE程序在求解装料优化问题方面具有很高的搜索效率和很好的全局性.     

力标准机独立加码与逆程交换研究

静重式力标准机在施加递增或递减负荷过程中，当砝码进行逆程交换时会出现逆负荷现象。为此，提出了力标准机独立加码的概念与方法，建立并讨论了独立加码方法的驱动方式、砝码加卸过程的运动规律、加卸过程中吊挂受力变化、加载稳定性和工作效率问题。研究了通过少量砝码的合理组合与交换，实现多力级等力值间隔加载的技术方法。当砝码进行逆程交换时，为减小以至消除逆负荷现象进行了理论分析和实验验证。结果表明，提出的方法是可行的和有效的。为力基、标准机的技术发展和提高提供了一种新的理论方法和试验依据，对力值计量检测技术的进步具有重要意义。     

Stress concentration degree affects spontaneous magnetic signals of ferromagnetic steel under dynamic tension load

Under the excitation of geomagnetic field, stress can induce spontaneous magnetic signals in ferromagnetic materials, which can be potentially applied to estimate the damage degree. In this research, the normal component of magnetic field, H_p(y), was measured during dynamic tension test on the surfaces of ferromagnetic specimens having different stress concentration factors, α constant amplitude sinusoidal tensile load cycles were applied on 18CrNi4A steel plate specimens whose α were respectively 1, 3 and 5. Then correlation of H_p(y) values’ changes with loading cycles reported. The results indicate that stress concentration factor, α extremely affects the magnetic signal, the absolute value of the gradient, |K|, increases with the increase of α. Meanwhile, |K| also goes up when loading cycle increases in the initial state. However, after a few cycles, those H_p(y) curves corresponding to different cycles become similar before cracking.     

90年代美国火工品技术发展规划及研究进展

介绍了90年代美国国防部、能源部、航天局关于火工品技术的项目及其背景，综述了美国火工品技术的发展趋势及研究进展，提出了激光点火（起爆）、钝感高能起爆技术以及钝感高能火工药剂是今后的发展方向。