磁传动高压静密封阀门的研制

介绍了磁力传动高压静密封阀门的工作机理，磁路结构及材料对磁力耦合器传动力矩的影响，磁耦合力矩的温度特性．研制了根除泄漏的磁传动阀门，并在高温、高压、易燃、易爆、剧毒的生产装置中应用成功。     

薄透镜的等光程性证明

薄透镜的等光程性在许多基础物理教材中仅给予了定性的说明，本文以空气中的薄透镜为例，分四种情况，定量地证明了薄透镜的等光程性     

一种改进了的矩闭合法及其在振动工程中的应用

本文提出一种求解多自由度非线性随机振动问题的改进的高斯闭合法。此法解决了一般高斯闭合法自谱时会出负值＾［１］的矛盾，并且方程数仅为文献［４］的１／４，还避免了文献［４］方法在解某些方程时所导致的错误。从算例上看，本方法得到了与等效线性化方法一致的结果，又可以得到等效线性化方法所得不到的某些频域信息。此外，文中还用方法分析了装有非线性减振器的风力灭火风机车辆系统的振动。     

一类带权连通有向图及其应用

用数学方法给出了一类带权连通有向图的路径及路径表达式的定义;并以一种新的形式表示出生成从入口到出口所有路径集的算法,同时介绍了这一算法的应用及其应用模式。     

混合步长网络漫游最短路算法的进一步研究

就作者所提出的“混合步长网络漫游最短路算法”进行了进一步的研究,探讨了该方法的可行性定理、负回路的检测、最大漫游次数等问题。最后,围绕该方法提出了有待进一步研究的最大问题。     

基于神经网络的最短路算法及其应用

提出一种基于递归神经网络的最短路算法,降低了神经元之间的连接复杂度,能稳定收敛到准最优解。并将其应用于基于流量的动态分布式路由。仿真表明,该处上敛稳定。     

临淮岗洪水控制工程淮河截流的建设管理

临淮岗洪水控制工程是国家"十五"重点项目,淮河截流是工程建设的里程碑.为贯彻国务院加快治淮工程建设的重大决定,临淮岗工程需全面加快建设,提前1 a实施截流.淮委临淮岗工程建设管理局认真分析研究淮河截流的特点和面临的诸多不利因素,合理确定截流工程的项目管理模式,科学制订导流、截流方案,精心组织、科学调度、果断决策,与各参建单位齐心协力、克服困难,成功截流.     

SMALL CRACK GROWTH AND FATIGUE LIFE PREDICTIONS FOR HIGH-STRENGTH ALUMINIUM ALLOYS: PART I—EXPERIMENTAL AND FRACTURE MECHANICS ANALYSIS

The small crack effect was investigated in two high-strength aluminium alloys: 7075-T6 bare and LC9cs clad alloy. Both experimental and analytical investigations were conducted to study crack initiation and growth of small cracks. In the experimental program, fatigue tests, small crack and large crack tests were conducted under constant amplitude and Mini-TWIST spectrum loading conditions. A pronounced small crack effect was observed in both materials, especially for the negative stress ratios. For all loading conditions, most of the fatigue life of the SENT specimens was shown to be crack propagation from initial material defects or from the cladding layer. In the analysis program, three-dimensional finite element and weight function methods were used to determine stress intensity factors and to develop SIF equations for surface and corner cracks at the notch in the SENT specimens. A plasticity-induced crack-closure model was used to correlate small and large crack data, and to make fatigue life predictions. Predicted crack-growth rates and fatigue lives agreed well with experiments. A total fatigue life prediction method for the aluminium alloys was developed and demonstrated using the crack-closure model.     

HIGH RESOLUTION COMPUTED TOMOGRAPHY AND IMPLICATIONS FOR FATIGUE CRACK CLOSURE MODELLING

Understanding the physical bases of a cracked sample’s macroscopic response to applied loading, e.g. fatigue crack closure, requires non-destructive, microscopic quantification of the crack face separations as a function of applied load. Ideally, these measurements should cover the entire crack face. Non-destructive sectioning with high resolution X-ray computed tomography has been used for in situ observations of the crack faces under applied load in samples of Al–Li 2090, and in this paper, the crack openings that were measured in the interior of the sample are related to crack face geometry and to changes in the slope of load–displacement curves. The implications of these results are discussed for physically based crack closure modelling.     

移动小车的路径跟踪与镇定

本文讨论受非完整约束限制的移动小车的几何路径跟踪与镇定问题，给出了小车以恒定速度跟踪任意期望几何路径的控制律，证明了小车的实际运动路径渐近收敛于期望的路径。文中还讨论了小车的镇定问题，给出了小车从任意初始位置和姿态到达另一位置和姿态的控制方案，最后给出了仿真结果。