滚珠弧面蜗杆传动的回珠曲线

本文根据微分几何中曲线接触理论,对滚珠弧面蜗杆传动中的滚珠回珠曲线进行了理论分析和计算,并确定出一条合理的回珠曲线,为返回器的设计和加工提供了较合理的参数。     

悬臂矩形板的不对称弯曲

本文用 Rayleigh—Ritz 法讨论了悬臂矩形板在反对称荷载作用下的弯曲问题。并利用力的迭加原理讨论了悬臂矩形板的不对称弯曲问题,给出了较为精确的近似解答。     

随机参数反对称层合板响应的统计特征

工程结构中的复合材料层合板的几何参数往往具有随机性质．如何研究随机参数层合板的统计特性，这对正确估计结构设计的可靠性有着非常重要的意义。本文用样条配点法，将复合材料层合板结构离散后，应用Lagrange方程，建立了复合材料层合板的力学模型，研究了随机参数反对称层合板响应的统计特性，推导出层合板位移，速度和加速度的标准差。     

SOME RESULTS ON CIRCULAR PERFECT GRAPHS AND PERFECT GRAPHS

An r-circular coloring of a graph G is a map f from V(G) to the set of open unit intervals of an Euclidean circle of length r, such that f(u) ∩ f(v) = Ф whenever uv ∈ E(G). Circular perfect graphs are defined analogously to perfect graphs by means of two parameters, the circular chromatic number and the circular clique number. In this paper, we study the properties of circular perfect graphs. We give (1) a necessary condition for a graph to be circular perfect, (2) some circular critical imperfect graphs, and (3) a characterization of graphs with the property that each of their induced subgraphs has circular clique number the same as its clique number, and then the two conjectures that are equivalent to the perfect graph conjecture.     

承受均匀载荷的固定夹紧板的非线性弯曲的摄动DQ解

运用摄动DQ法研究承受均匀载荷的固定夹紧板的非线性弯曲问题,数学原理简单,具有良好的计算精度和计算效率.     

Probabilistic Optimum Design of Symmetric Laminates under First-Ply Failure

This paper proposes a procedure for the optimum design of composite laminates with initial imperfection under probabilistic considerations. The initial imperfection, strength parameters and ply-level thickness are considered as random variables. Ply-level failure probability is evaluated by the first order reliability method and system reliability is computed based on the first-ply failure criterion. The optimum design is formulated to consider the laminate thickness as the objective function and reliability requirement as the constraint. A numerical example is presented to demonstrate the methodology proposed.     

内蒙古自治区循环经济发展模式及评价体系研究

构建了内蒙古自治区循环经济发展模式,建立了循环经济发展水平评价指标体系并对内蒙古自治区循环经济的发展现状进行评价,为内蒙古自治区发展循环经济提供了参考依据和理论借鉴。     

符拉索夫地基上筏基分析的样条无单元法

将样条无单元法应用于筏基中，建立按厚板分析筏基的计算格式，考虑筏板与符拉索夫地基的相互作用，编制相应的计算程序，并给出了算例。利用样条无单元法分析筏基，不仅计算简便，精度高，而且未知量的数目很少。     

初始薄膜力对复合材料多层板壳自振频率的影响

在文献 (王震呜 .复合材料力学和复合材料结构力学 ,北京 :机械工业出版社 ,1991)给出的各向异性多层扁壳的自由振动方程的基础上 ,在初始薄膜力Nox、Noy各种取值的情况下分析了复合材料多层扁壳的自由振动 ,总结了自振频率随Nox、Noy的变化规律 ,为复合材料多层板壳的工程运用提供了一定的依据