基于浸润线矩阵的尾矿坝稳定性分析

由于尾矿坝的渗流边界条件极为复杂,采用的二维简化理论分析法的计算结果有可能与实测浸润线的结果相差较大,急需一种能较为准确预测尾矿坝浸润线位置的简易算法。在深入剖析尾矿坝浸润线影响因素的基础上,建立了浸润线叠加影响函数,归纳出与尾矿坝坝体特征相关的阶段影响因子,提出反映阶段影响因子的浸润线矩阵。运用多项式回归分析浸润线观测数据,拟合得出浸润线观测孔水位与库水位的函数曲线,求得尾矿坝浸润线矩阵。

斜线矩阵环

斜线矩阵环李秀萍矩阵理论作为一种重要的数学方法在工程技术、经济数学、生物学以及医学等领域有着广泛而深刻的应用。即使从纯数学的角度来看，矩阵论的观点和方法也几乎渗透到现代数学的每个分支中．近年来矩阵论研究的一大趋势是系数域向交换环过渡，即把传统的域上矩...

矩阵的次线转置变换

本文引进了域上 n 阶方阵次对角线转置变换的概念,证明了:|A^(?)|=|A|,A^(?)～A;任何方阵都可表成两个次线对称阵之积,并给出寻找上述次线对称阵的计算方法.

浅谈矩阵布线在高大平房仓应用中存在的问题

我国粮食系统粮仓储粮温度的检测经过了从铁杆测温到热敏电阻网状布线测温、热敏电阻矩阵布线测温、步进器自动测温、数字式自动检测到微机自动巡回检测几个阶段.矩阵布线作为粮温检测技术中的一个重要组成部分,近年来在各级粮食部门得到了广泛的应用,对促进我国"双低"规范化储粮起到了很大的作用,特别是我国250亿千克中直粮库建设的完成并投入使用,使矩阵布线在高大平房仓的储粮应用中得到进一步的推广.

次线对称矩阵的一些性质

本文利用次线对称矩阵的定义,得到了关于次线对称矩阵的几个基本性质,得到了对称矩阵与次线对称矩阵之间的关系的定理、任意 A∈M_n(F)可分解为两个次线对称矩阵之积的定理。

次线反对称矩阵的性质

给出了关于次线反对称矩阵的定义及几个基本性质，得出了反对称矩阵与次线反对称矩阵之间的关系的定理．

面向发动机部件定制加工的矩阵式智能产线设计

针对发动机制造企业提出的部件个性化定制加工需求,提出一种矩阵式智能产线布局,围绕产线的功能分析、方案设计、仿真与调试验证等多维度进行开发,通过整合物联网、智能控制、工业机器人、MES系统等先进技术实现智能排产、加工、检测、装配和仓储等功能;结合工艺仿真手段对所设计产线进行场地布局优化和虚拟调试,根据仿真结果搭建并成功调试产线。实践证明:产线设计合理、运行稳定,达到预期的设计要求,可实现发动机部件的全过程智能化生产。

CWJ型矩阵布线测温探索

前言测温设备是粮食储藏中不可缺少的重要组成部分。根据全区使用干簧管矩阵布线测温多年来,发现推广面还存在着一定的局限性,它的测量受到市电供应的影响,对焊接技术要求高,经济投资大,操作复杂等,为解决这些问题,进一步地完善测温装制,我们选择性地使用了CWJ型矩阵测温仪,经名山县百丈、黑竹、马岭等三个粮库使用,双河粮库用干簧管矩阵布线做对比实验。认为: CWJ矩阵布线测温能够克服上述干簧管矩阵布线测温的不足,推广性好。

一种配电网故障区段定位的改进矩阵算法

分析了现有配电网故障定位矩阵算法存在的问题,提出一种配电网故障区段定位改进矩阵算法。该方法以网络关联矩阵描述馈线区段和测控点的拓扑联接关系,根据故障发生时与故障馈线区段相连测控点的故障过电流特征,形成一种适用于各类型馈线区段故障判定的统一判据。该算法判据形式统一、计算量小,省去了规格化处理与多次设定正方向的过程,能够解决环网故障、馈线末端故障、多电源网络多重故障定位等问题。

Flow-shop网络作业计划模型的解法

将 Flow-Shop网络作业计划的优化模型 Sch( m,n) Lp[1 ] 化为向量矩阵线性空间 ,利用线性空间的理论提出了一个求解

Exponential stability criteria on neural networks with continuously distributed delays

The exponential stability of a class of neural networks with continuously distributed delays is investigated by employing a novel Lyapunov-Krasovskii functional. Through introducing some free-weighting matrices and the equivalent descriptor form, a delay-dependent stability criterion is established for the addressed systems. The condition is expressed in terms of a linear matrix inequality （LMI）, and it can be checked by resorting to the LMI in the Matlab toolbox. In addition, the proposed stability criteria do not require the monotonicity of the activation functions and the derivative of a time-varying delay being less than 1, which generalize and improve earlier methods. Finally, numerical examples are given to show the effectiveness of the obtained methods.

STABILITY ANALYSIS AND COOPERATIVE CONTROL OF DISTRIBUTED MULTI-AGENT SYSTEM WITH SAMPLED COMMUNICATION

The cooperative control and stability analysis problems for the multi-agent system with sampled com- munication are investigated. Distributed state feedback controllers are adopted for the cooperation of networked agents. A theorem in the form of linear matrix inequalities（LMI） is derived to analyze the system stability. An- other theorem in the form of optimization problem subject to LMI constraints is proposed to design the controller, and then the algorithm is presented. The simulation results verify the validity and the effectiveness of the pro- posed approach.

Static Output Feedback H_∞ Controllers Design for Descriptor Linear Systems Based on LMI

This paper considers the design problem of static output feedback H ∞ controllers for descriptor linear systems with linear matrix inequality (LMI) approach. Necessary and sufficient conditions for the existence of a static output feedback H ∞ controller are given in terms of LMIs. Furthermore, the design method of H ∞ controllers is provided using the solutions to the LMIs.

FUZZY ROBUST H_∞ CONTROL OF UNCERTAIN NONLINEAR SYSTEM WITH TIME-DEALY

This paper addresses the problem of the fuzzy H ∞state feedback control for a class of uncertain nonlinear systems with time delay. The Takagi Sugeno (T S) mo del with time delay and parameter uncertainties is adopted for modeling of nonlinear system. The systematic design procedure for the fuzzy robust controller based on linear matrix inequality (LMI) is given. Some sufficient conditions are derived for the existence of fuzzy H ∞ state feedback controllers such that the closed loop system is asymptotically stable and the effect of the disturbance input on controlled output is reduced to a prescribed level. An example is given to demonstrate the effectiveness of the proposed method.

New criterion for delay-dependent absolute stability of Lurie system with interval time-varying delay

The delay-dependent absolute stability for a class of Lurie systems with interval time-varying delay is studied. By employing an augmented Lyapunov functional and combining a free-weighting matrix approach and the reciprocal convex technique, an improved stability condition is derived in terms of linear matrix inequalities （LMIs）. By retaining some useful terms that are usually ignored in the derivative of the Lyapunov function, the proposed sufficient condition depends not only on the lower and upper bounds of both the delay and its derivative, but it also depends on their differences, which has wider application fields than those of present results. Moreover, a new type of equality expression is developed to handle the sector bounds of the nonlinear function, which achieves fewer LMIs in the derived condition, compared with those based on the convex representation. Therefore, the proposed method is less conservative than the existing ones. Simulation examples are given to demonstrate the validity of the approach.

全局最优鲁棒控制器设计

研究了一类时变不确定系统 ,证明了求解全局最优鲁棒性能问题的一组线性矩阵不等式 (LMI) ,给出了相应的全局最优鲁棒控制器的具体设计方法 .

New tangent stiffness matrix for geometrically nonlinear analysis of space frames

A three-dimensional beam element is derived based on the principle of stationary total potential energy for geometrically nonlinear analysis of space frames. A new tangent stiffness matrix, which allows for high order effects of element deformations, replaces the conventional incremental secant stiffness matrix. Two deformation stiffness matrices due to the variation of axial force and bending moments are included in the tangent stiffness. They are functions of element deformations and incorporate the coupling among axial, lateral and torsional deformations. A correction matrix is added to the tangent stiffness matrix to make displacement derivatives equivalent to the commutative rotational degrees of freedom. Numerical examples show that the proposed dement is accurate and efficient in predicting the nonlinear behavior, such as axial-torsional and flexural-torsional buckling, of space frames even when fewer elements are used to model a member.

基于模块化射线追踪的矩阵MOC方法(1)——理论研究

研究基于模块化射线追踪的矩阵特征线(MOC)方法,在模块化技术的基础上,提出计算对称堆芯的方法,降低内存消耗并提高计算效率;分析系数矩阵的构造过程,挖掘系数矩阵的数值特性,该数值特性的综合利用节省了系数矩阵的构造时间和存储空间;基于模块化矩阵MOC方法研究多群耦合的广义极小残差(GMRES)算法,加速了上散射条件下的多群迭代。

T-S-fuzzy-model-based quantized control for nonlinear networked control systems

In order to overcome data-quantization, networked-induced delay, network packet dropouts and wrong sequences in the nonlinear networked control system, a novel nonlinear networked control system model is built by the T-S fuzzy method. Two time-varying quantizers are added in the model. The key analysis steps in the method are to construct an improved interval-delay-dependent Lyapunov functional and to introduce the free-weighting matrix. By making use of the parallel distributed compensation technology and the convexity of the matrix function, the improved criteria of the stabilization and stability are obtained. Simulation experiments show that the parameters of the controllers and quantizers satisfying a certain performance can be obtained by solving a set of LMIs. The application of the nonlinear mass-spring system is provided to show that the proposed method is effective.