共查询到19条相似文献,搜索用时 109 毫秒
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离散事件动态系统的关键路径与扰动分析 总被引:9,自引:0,他引:9
具有存储器的串行生产线是一典型离故事件动态系统.本文在其极大代数上线性状态方程的基础上,定义了关键路径,并研究了关键路径的特性.通过关键路径,给出了其扰动分析方法. 相似文献
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带缓冲器的多出口串行生产线的无阻塞最优控制 总被引:1,自引:0,他引:1
张仁忠 《纯粹数学与应用数学》2000,16(1):15-20
用极大代数方法讨论了带缓冲器的串行生产线的无阻塞最优控制问题,给出了多出口情况下串行生产线的加工状态方程及最优控制。 相似文献
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多入口多出口串行生产线的最优节奏控制 总被引:1,自引:0,他引:1
本文用极大代数方法讨论了多入口多出口情况下带存储器有阻塞串行生产线的最优节奏控制问题,给出了串行生产线的状态方程,批量生产的生产周期公式及其函数形式,最后应用陈文德(1997)提出的算法对生产线实现了最优节奏控制。 相似文献
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一类离散事件动态系统极点分配的优化问题 总被引:1,自引:0,他引:1
应用极大代数作为数学工具,用系统矩阵的特征值法讨论了m × n-型离散事件动态系统极点分配的优化问题.给出了系统取得优化的条件.并证明了至少存在,n个具有最优极点分配的优化系统. 相似文献
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张仁忠 《纯粹数学与应用数学》2000,16(2):19-25
利用极大代数方法讨论多入口串行生产线的生产周期问题,给出在无阻塞控制下的多入口 行生产线生产周期的计算公式及其批量加工生产时的周期公式。 相似文献
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本文利用指数型增广拉格朗日函数将一类广义半无限极大极小问题在一定条件下转化为标准的半无限极大极小问题,使它们具有相同的局部与全局最优解.我们给出了两个转化条件:一个是充分与必要条件,另一个是在实际中易于验证的充分条件.通过这种转化,我们给出了广义半无限极大极小问题的一个新的一阶最优性条件. 相似文献
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本文论述了液压大系统仿真的模块式建模法及其相应的隐式状态方程数值解法——代数-积分混合算法.根据模块式建模法建立了液压调速系统的数学模型,并利用代数-积分混合算法对调速系统进行了数值仿真,仿真结果与实验结果十分吻合.该建模法及其算法首次在液压大系统仿真中得到应用. 相似文献
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S. B. Gershwin 《Annals of Operations Research》1987,9(1):511-530
A transfer line is a tandem production system, i.e. a series of machines separated by buffers. Material flows from outside the system to the first machine, then to the first buffer, then to the second machine, the second buffer, and so forth. In some earlier models, buffers are finite, machines are unreliable, and the times that parts spend being processed at machines are equal at all machines. In this paper, a method is provided to extend a decomposition method to large systems in which machines are allowed to take different lengths of time performing operations on parts. Numerical and simulation results are provided. 相似文献
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本文研究陀螺系统特征值问题的Jacobi-Davidson方法. 利用陀螺系统的结构性质,给出了求解Jacobi-Davidson方法中校正方程的有效方法. 基于非等价低秩收缩技术,给出了计算陀螺系统一些特征值的收缩Jacobi-Davidson方法. 数值结果表明本文所给算法是有效的. 相似文献
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Xiusan Xing 《中国科学A辑(英文版)》1998,41(4):411-421
Some derivations based on the anomalous Langevin equation in Liouville space (i.e. Γ space) or its equivalent Liouville diffusion equation of time-reversal asymmetry are presented. The time rate of change, the balance equation, the entropy flow, the entropy production and the law of entropy increase of Gibbs nonequilibriurn entropy and Boltzmann nonequilibrium entropy are rigorously derived and presented here. Furthermore, a nonlinear evolution equation of Gibbs nonequilibrium entropy density and Boltzmann nonequilibrium entropy density is first derived. The evolution equation shows that the change of nonequilibrium entropy density originates from not only drift, but also typical diffusion and inherent source production. Contrary to conventional knowledge, the entropy production density σ?0 everywhere for all the inbomogeneous systems far from equilibrium cannot be proved. Conversely, σ may be negative in some local space of such systems. 相似文献
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In this paper, a new approximate method has been presented to solve the linear Volterra integral equation systems (VIEs). This method transforms the integral system into the matrix equation with the help of Taylor series. By merging these results, a new system which corresponds to a system of linear algebraic equations is obtained. The solution of this system yields the Taylor coefficients of the solution function. Also, this method gives the analytic solution when the exact solutions are polynomials. So as to show this capability and robustness, some systems of VIEs are solved by the presented method in order to obtain their approximate solutions. 相似文献
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《Journal of computational science》2014,5(5):795-808
In this paper, a novel qualitative differential equation model learning (QML) framework named QML-Morven is presented. QML-Morven employs both symbolic and evolutionary approaches as its learning strategies to deal with models of different complexity. Based on this framework, a series of experiments were designed and carried out to: (1) investigate factors that influence the learning precision and minimum data requirement for successful learning; (2) address the scalability issue of QML systems. 相似文献
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本文研究了在一类马氏相关更新风险模型中的红利-惩罚等式的问题.推导了在常数红利边界下,折扣惩罚函数满足的方程,利用解微分-积分方程的方法,更简洁的推出了红利-惩罚等式相关的结果,推广了文献[1]的结论. 相似文献
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In this paper we explore higher order numerical quadrature for the integrations of systems containing Bessel, Anger and Weber functions. The method is constructed by finding the approximate solution of the differential equation and truncating the asymptotic series. Numerical examples based on theoretical results are presented to demonstrate the efficiency of the method. 相似文献