榫卯-灌浆套筒混合连接装配式方墩轴压性能研究

已有研究表明,榫卯-灌浆套筒混合连接装配式方墩（简称混合连接拼装桥墩）的抗震性能接近于整体现浇桥墩。为进一步探讨混合连接拼装桥墩的轴压性能,以钢管的长度、直径以及壁厚等为变化参数,进行1个整体现浇桥墩（编号ZT）和4个混合连接拼装桥墩（编号GTA-0~GTD-0）的轴压承载力试验,结果表明,GTA-0~GTD-0试件的承载力比ZT试件提高了10.1%~14.4%,其延性系数均大于ZT试件;GTA-0~GTD-0试件的轴压承载力随钢管直径和长度的增大而增大,而钢管壁厚对于试件承载力的影响较小;拼装桥墩的破坏位置随着钢管长度的增加而上移,逐渐接近于整体现浇桥墩,但二者的破坏模式基本相同。     

并形系统的3种网络DEA模型与应用选择

网络数据包络分析模型可以用来同时测算决策单元的系统及其每个子系统的效率.现有的网络数据包络分析模型可以分为独立模型和关联模型两类,且主要以并形和链形这2种基本网络结构为对象,研究其规模报酬不变假设下的效率评价问题.根据实际情况,将给出半独立并形系统的效率评价方法,并在规模报酬可变的假设下,建立一个并形关联网络DEA模型,用来测算纯技术效率和规模效率.对独立、半独立和关联网络DEA 3种模型的比较研究发现:独立网络DEA模型不符合管理实践;尽管半独立网络DEA模型具有实践背景,但理论分析和实证研究表明该模型应用价值有限;而关联网络DEA模型不仅具有实践背景,而且与其他模型相比系统效率评价结果具有较强的可分性,这些特质使其有理由成为目前并形系统效率评价的首选模型.     

双代号网络图中虚工序对时差计算公式的影响与修正

如何使用最少的虚工序和虚节点绘制双代号网络图属于NP-hard问题,所以对于任意一个给定的项目,会存在多个正确的而且虚工序画法不同的双节点网络图与之对应.本文的目的在于研究双代号网络图中不同虚工序对时差计算公式的影响并进行修正.虚工序画法的不同会导致网络图中产生数量和类型不同的节点,因此研究方法从分析节点入手.首先根据虚工序的画法将节点分为一般节点,虚出节点和虚进节点三类,然后逐一分析每类节点对工序时间参数节点式计算公式的影响.通过同定义式算法对比,结果发现工序自由时差和安全时差的节点式算法分别对于虚出节点和虚进节点失效.最后提出节点式计算公式的修正方法,实例分析证明本算法简捷有效.     

THE HAMMING DISTANCES OF NEGACYCLIC CODES OF LENGTH 2^s OVER GR （2^α, m）

The Hamming distances of all negacyclic codes of length 28 over the Gaiois ring GR （2^α, m） are given. In particular, the Lee distances of all negacyclic codes over Z4 of length 2^s are obtained. The Gray images of such negacyclic codes over Z4 are also determined under the Gray map.     

Cluster Synchronization in a Complex Dynamical Network with Two Nonidentical Clusters

This paper further investigates cluster synchronization in a complex dynamical network with two-cluster. Each cluster contains a number of identical dynamical systems, however, the subsystems composing the two clusters can be different, i.e., the individual dynamical system in one cluster can differ from that in the other cluster. Complete synchronization within each cluster is possible only if each node from one cluster receives the same input from nodes in other cluster. In this case, the stability condition of one-cluster synchronization is known to contain two terms： the first accounts for the contribution of the inner-cluster coupling structure while the second is simply an extra linear term, which can be deduced by the ＂same-input＂ condition. Applying the connection graph stability method, the authors obtain an upper bound of input strength for one cluster if the first account is known, by which the synchronizability of cluster can be scaled. For different clusters, there are different upper bound of input strength by virtue of different dynamics and the corresponding cluster structure. Moreover, two illustrative examples are presented and the numerical simulations coincide with the theoretical analysis.     

有向多重边复杂网络的自适应同步控制

基于网络拆分的思想,将具有不同时延的多重边有向复杂网络进行拆分,建立了具有非线性耦合节点的多重边有向复杂网络模型,并对其自适应同步控制加以研究.运用Lyapunov稳定性理论并结合自适应控制方法,给出了外部耦合系数未知的情况下自适应同步控制器的设计,最后以陈系统为例对多重边有向复杂网络进行数值仿真,验证了控制策略的有效性.     

曲面薄壳有限元离散误差分析和修正方法研究

基于曲面薄壳几何/物理方程和有限元离散原理推导,揭示了壳单元离散方法特点、刚度矩阵误差产生机理和范数表示方法。以航空涡轮发动机测压探针为例,深入研究了利用协调平板壳单元、非协调平板壳单元、一次和二次实体退化壳单元等不同类型单元离散曲面薄壳时,应力计算误差影响因素及变化规律,综述了单元的适用条件。基于Boltzmann模型提出了应力计算结果修正通式,通过FORTRAN语言编程修正应力仿真结果和ANSYS二次开发语言APDL命令实现应力修正结果的读取和后处理,应力修正结果与理论解相对误差小于5%,满足曲面薄壳设计和稳定性分析应用要求。

Abstract：

Based on the geometric physical equations and deduction of discrete process of finite element for curved thin-walled structure,characteristics of shell elements for discretion and discrete error for element stiffness matrix were analyzed theoretically,and the norm expression of discrete error for element stiffness matrix was put forward.Then,as an illustration,a probe for detecting the pressure inside turboprops was meshed by curved thin-walled shell element,compatible flat shell element,incompatible flat shell element and 3D degenerated shell element,respectively,and the stress of the probe was numerically calculated by FEM.On the basis of solved results,the stress error was analyzed thoroughly,the influence factors on the error and the applying situations for different elements were determined.Finally,the general form of correctional function was put forward according to the Boltzmann model.The program developed with FORTRAN was used to correct the numerical results and the APDL commands inside ANSYS software were utilized to read and plot the correctional stress results.Through the correction,the discrete error can be reduced within 5% that satisfies the requirement of application for structural design and stability analysis.     

C~4ISR需求模型及一体化描述

研究了C4ISR需求要素及层次化C4ISR需求模型.探讨了节点、活动和信息在节点-关系模型、信息模型与IDEF0活动模型相互之间的映射关系,包括节点映射、活动映射、信息需求映射和约束数据映射,使节点,活动和信息在C4ISR需求模型中匹配起来;在此基础上,提出C4ISR需求一体化层次建模方法.最后,通过一个案例示例以说明了所提出方法的有效性,实用性.     

单车型确定性动态车辆调配问题

给出了单车型确定性动态车辆调配问题的定义,引入网络图描述该问题.建立了问题的线性规划模型,鉴于线性模型的缺点,利用函数逼近技术构造一个特殊的线性函数来近似目标函数中未来时段部分,从而建立起问题的时空分解模型,把问题从时间和空间上分解为多个单时段单节点问题,并根据单时段单节点问题特点设计简单的排序求解方法.最后,给出了模型的完整求解过程,从而使问题得到有效地解决.     

论社会教化的系统性

通过对社会教化是多因素动态开放系统、行进的社会开放能动的社会教化系统及我国当前状态下社会教化的切入点三方面的论述、指出章的主题：社会教化的系统性。