广义城市设计--要素与系统

通过对城市设计历史演进过程的分析,提出了广义城市设计的概念,总结归纳了广义城市设计的设计原则和发展趋势,并对广义城市设计的六要素和三个系统进行详细论述,建立了广义城市设计的基本方法体系。     

广义连续随机线性系统的状态估计问题

利用矩阵的奇异值分解理论 ,给出了广义连续随机线性系统的奇异值标准形式 ,基于标准形式 ,在两种情况下 ,将系统分解成两个子系统 ,通过估计子系统的状态 ,讨论了广义连续随机线性系统的状态估计问题 ,得到该系统状态的最优预测和滤波递推方程 .     

广义系统的最经济控制结构综合问题

讨论了广义系统的最经济控制结构综合的问题，给出了广义系统的最经济控制阵一般结构的求法及具体示例，这种最经济控制阵一般结构的求法，只需要计算系统的极点及某些矩阵的秩．     

一类多滞后不确定非线性关联控制系统的结构与关联鲁棒镇定

建立了一类多组多滞后区间系数定常非线性控制系统的结构概念，采用李雅鲁诺夫函数鲁棒镇定的等价法，给出了具有扰动结构参数的多组多滞后区间系数定常非线性关联控制系统的结构与关联鲁棒镇定，同时给出了扰动参数与滞后非线性项界线的估计公式。     

空调房间室温广义预测控制的仿真研究

简述了广义预测控制(GPC)的原理，建立了空调房间室温的CARIMA模型(即受控的自回归积分滑动平均模型)和基于该模型的空调房间室温广义预测控制系统。利用Matlab对该控制系统进行了仿真，并与常规PID控制进行比较，证明了广义预测控制可以应用于空调系统的控制过程，并能取得良好的控制品质和鲁棒性。     

关于滞后广义系统的变结构控制的一个结果

运用变结构控制方法,研究了控制具有滞后的广义系统,得到了其闭环系统渐近稳定的一个结果,并给出了具体的数值例子     

港口枢纽集装箱运输的组织优化研究

随着运输的集装箱化和物流化的发展 ,以及集装箱船舶的大型化、高速化给港口生产带来了巨大的压力 ,港口枢纽集装箱运输的组织优化研究也显得日益重要。本文在分析港口枢纽集装箱运输的流程及港口枢纽集装箱运输组织的优化原理后 ,重点研究了港口枢纽集装箱运输的广义费用函数 ,并提出了基于广义费用目标函数的港口到货主企业间不同运输方式的集装箱组织优化模型 ,最后进行实例分析 ,为港口管理决策提供了理论依据。     

评价理论的发展探讨

对评价内容，评价方法进行了综合分析，提出将硬系统和软系统相结合的广义系统评价方法，确立了新的指标体系和评价步骤，并用实例证明该方法的可行性和实用性．     

河南建设，因你们而精彩

2009,我们大步走过;2010,我们昂首挺进。2009,道路曲折、坎坷,甚至伴着风雨雷电。但是,我们自信的脚步始终铿锵有力。2009,全球的经济危机继续蔓延,我们镇定应对,4万亿拯救经济计划,成效显著,我们受益匪浅。建设系统的广大职工,不管是豫籍还是非豫籍,是你们远离妻儿,辛勤工作,用智慧和青春,     

基于LMI的不确定大系统的BIBO镇定

利用多Lyapunov函数法和不等式技巧,讨论了一类连续时间大系统有界输入有界输出(BIBO)的镇定.以线性矩阵不等式(LMI)的形式给出系统BIBO稳定的充分条件可以用MATLAB工具箱进行可行性求解并在此基础上给出了状态反馈控制器的设计方法并将其推广到系统结构中存在不确定扰动项的情形,运用Schur补引理,得到了闭环大系统鲁棒BIBO稳定的判据.最后通过算例仿真证明了结论的有效性.     

广义离散系统的周期解

首次对广义离散系统的周期解的存在性进行研究，给出了广义离散系统周期解存在的判据。     

A parametric study of the free vibration analysis of rotating laminated cylindrical shells using the method of discrete singular convolution

This paper deals with the free vibration analysis of rotating laminated cylindrical shells. The analysis uses discrete singular convolution (DSC) technique to determine frequencies. Regularized Shannon's delta (RSD) kernel is selected as singular convolution to illustrate the present algorithm. The formulations are based on the Love's first approximation shell theory, and include the effects of initial hoop tension and centrifugal and coriolis accelerations due to rotation. The spatial derivatives in both the governing equations and the boundary conditions are discretized by the DSC method. Frequency parameters are obtained for different types of boundary conditions, rotating velocity and geometric parameters. The effect of the circumferential node number on the vibrational behaviour of the shell is also analysed. The analysis has been verified by comparing results with those in the literature and sufficient agreement is obtained.     

Discrete singular convolution method for buckling analysis of rectangular Mindlin plates

The discrete singular convolution (DSC) method is proposed for solving the elastic buckling problem of thick rectangular plates under a uniaxial compressive loading. To allow for the effect of transverse shear deformation in thick plates, the Mindlin plate theory has been adopted. The numerical results are checked against available analytical and other numerical solutions. It is found that the convergence of the DSC approach is very good and the results agree well with those obtained by other researchers.     

An extended cell-based smoothed discrete shear gap method (XCS-FEM-DSG3) for free vibration analysis of cracked Reissner-Mindlin shells

A cell-based smoothed discrete shear gap method (CS-FEM-DSG3) was recently proposed and proven to be robust for free vibration analyses of Reissner-Mindlin shell. The method improves significantly the accuracy of the solution due to softening effect of the cell-based strain smoothing technique. In addition, due to using only three-node triangular elements generated automatically, the CS-FEM-DSG3 can be applied flexibly for arbitrary complicated geometric domains. However so far, the CS-FEM-DSG3 has been only developed for analyzing intact structures without possessing internal cracks. The paper hence tries to extend the CS-FEM-DSG3 for free vibration analysis of cracked Reissner-Mindlin shells by integrating the original CS-FEM-DSG3 with discontinuous and crack−tip singular enrichment functions of the extended finite element method (XFEM) to give a so-called extended cell-based smoothed discrete shear gap method (XCS-FEM-DSG3). The accuracy and reliability of the novel XCS-FEM-DSG3 for free vibration analysis of cracked Reissner-Mindlin shells are investigated through solving three numerical examples and comparing with commercial software ANSYS.     

Analysis of actuator delay compensation methods for real-time testing

Real-time testing is a useful technique to evaluate the performance of structural systems subjected to seismic loading. Servo-hydraulic actuators can introduce an inevitable delay when applying command displacements to a structure during a real-time test due to their inherent dynamics. Various compensation methods have been developed and applied in real-time testing to minimize the effect of actuator delay. This paper proposes an approach to analyze actuator delay compensation methods using an equivalent discrete transfer function. Discrete control theory is introduced and used to formulate the discrete transfer function in the frequency domain and the difference equation in the time domain for an actuator delay compensation method. The discrete transfer function is used to conduct frequency response analysis of the compensation method to provide insight into the expected performance of the compensation method by graphically illustrating the characteristics of the compensation method as a function of frequency of command displacement and the parameters for the compensator. The difference equation gives the form of the mathematical extrapolation in the time domain for the compensation method. Three popular compensation methods are selected to illustrate the proposed approach. Experiments with predefined sine sweep displacement and real-time hybrid simulations of a single-degree-of-freedom moment resisting frame with an elastomeric damper are conducted to experimentally validate the analysis of the selected compensation methods using the proposed approach.     

回转支承数控加工工艺与装备的应用研究

通过数控改造技术，建成回转支承数控加工生产线。运用数控强力切削技术与数控加工优化技术，对单排球式回转支承数控化生产中的加工工艺进行了分析与实践，解决了高效车削滚道时的颤振、滚道磨削的表面质量与磨削精度、滚道淬火质量等问题。     

Modeling and Kinematic Path Selection of Retractable Kirigami Roof Structures

This article proposes a numerical method for the kinematic path modeling of retractable roof structures based on the concept of kirigami. The kinematics of origami structures have been studied by many researchers. However, the singular point in the kinematic path which will crucially affect the overall performance of the structure has not been investigated. In this article, the method to detect the singular point in the kinematic path is first introduced. Then, a prediction‐correction algorithm is developed to simulate the motion along a uniquely determined path. A second‐order program is used to select kinematic paths deviating from a singular point. After that, the proposed method is applied in the kinematic modeling of a kirigami structure to show its accuracy.     

Application of singular spectrum analysis to structural monitoring and damage diagnosis of bridges

Singular spectrum analysis (SSA) is a novel technique and has proven to be a powerful tool for time series data analysis. Through singular value decomposition of Hankel matrix data, the time series of data can be decomposed into several simple, independent and identifiable components from singular values and singular vectors. It has already been widely applied to process climatic, meteorological, geophysical and economic data. In this paper, we demonstrate that the coupling degree of the 1st and 2nd singular values in SSA contains useful indications on the feature and composition of the analysed signal. The proposed method is successfully applied to the monitoring of structure, such as damage detection of the simulated dynamic system, experimental steel frame, bridge foundation scouring and pier settlement in the laboratory and on-site bridge monitoring during typhoon strike. The proposed algorithm is simple and suitable for structural health monitoring in the field.     

一个离散半比率依赖捕食-食饵系统的持久性

研究了一个带有 Holling II 类功能反应和时间延迟的离散半比率依赖捕食-食饵系统,Holling II 功能性反应函数被称为无脊椎动物型;时间延迟是由于负反馈现象引起的. 通过分析,给出了该系统保持持久性的充分条件,保证了捕食者和食饵长期时间内不会灭绝,也不会无限的繁殖下去,同时说明该生物种群对环境有很强的适应性.