九顶山铜钼矿软岩巷道锚喷网支护研究

针对九顶山铜钼矿矿体松散破碎、自稳能力差及需大量支护等特点,优选锚喷网支护方式对岩体进行加固;确定了树脂锚杆、基于32.5级普通硅酸盐水泥所制混凝土与Q235钢筋网联合支护巷道;设计了锚喷网支护形式并规定了施工工艺技术,并在五中段二盘二穿2P213测点附近进行了工业试验;为检测支护效果,进行了巷道收敛变形监测,前60天,巷道变形由约7mm加速降低至约3mm;60天后巷道变形趋缓,并在100天后逐渐降低至0.1mm并保持基本不变;水平收敛值大于顶板;结果表明:锚喷网支护能够有效控制巷道移动变形,提高岩体整体性及稳定性,增强井下工人安全性。     

Decoupling Control of Nonlinear Coupled Core Reactor

This paper concerns the application of the decoupling theory for a nonlinear system to the power control of the coupled core reactor. By using this theory, we can deal with the power change problem, the regulating problem for a system subject to a large perturbation, etc., which cannot be dealt with by the decoupling theory for a linear system.

But, since this theory assumes tacitly that all the states are measurable, the theory can not be applied directly to the nuclear reactor that has nonmeasurable state variables such as the delayed neutron precursor. In this paper, the above difficulty is overcome by introducing the observer theory for a nonlinear system.

The decoupling controller and observer resulted from these theories are applied to the coupled core reactor and the dynamic characteristic of the reactor is simulated by the digital computer. The simulation shows that the reactor power of each core is controlled satisfactorily in decoupling manner.     

Effective Convergence of Fission Source Distribution in Monte Carlo Simulation

The effective technique to accelerate the convergence of a fission source distribution in a Monte Carlo simulation is proposed as an application of a fission matrix. It is found that this acceleration method is especially useful for large core analysis where the fission source distribution is slowly converged in a Monte Carlo simulation by the source iteration method. It is found that the number of inactive cycles can be automatically determined and reduced by the acceleration method in this investigation.     

基于解析解和边界元解的圆柱壳声辐射对比研究

针对工程广泛应用的圆柱壳结构,首次运用解析法探讨了边界元软件Sysnoise两种加载方式—基于单元(Element)加载和基于节点(Node)加载—对声辐射影响,以及两种加载方式在网格加密情况下的收敛性问题。得到一些对工程计算的有益结论：① 基于单元(Element)加载方式得到的结果要好于基于节点(Node)加载方式;② 基于单元(Element)加载方式网格加密时收敛到解析解,而基于节点(Node)加载方式网格加密后,不一定得到收敛结果。     

行为两两NQD阵列加权和的矩完全收敛性

负相依在统计分析和可靠性理论中有着广泛地应用。本文的目的是要研究行为两两负象限相依阵列加权和的矩完全收敛性。利用矩不等式和截尾方法,建立了行为两两负象限相依阵列加权和的矩完全收敛性的充分条件,同时给出了具体应用,获得了基于负象限相依序列的平滑移动过程的矩完全收敛性,推广并完善了以前的结果。     

燃气间歇窑炉最优控制初探

尝试将线性规划技术应用到燃气间歇窑炉的操作管理中。叙述了线性规划模型(LPM)的建立过程及求解过程中利用改进单纯形法加快收敛速度的理论基础,并在计算机上进行模拟分析,得出的结果与理论分析相吻合。     

Convergence of asynchronous variational integrators in linear elastodynamics

Within the setting of linear elastodynamics of simple bodies, we prove that the discrete action functional obtained by following the scheme of asynchronous variational integrators converges in time. The convergence in space is assured by standard arguments when the finite element mesh is progressively refined. Our strategy exploits directly the action functional. In particular, we show that, if the asynchronicity of time steps and nodal initial data satisfy a boundedness condition, any sequence of stationary points of the discrete action functional is pre‐compact in the weak?* W^1,∞ topology and all its cluster points are stationary points for the continuous (in time) action. In this sense our proof is new with respect to existing ones. Copyright © 2007 John Wiley & Sons, Ltd.     

区间不确定系统迭代学习控制的单调收敛性

针对离散线性时不变系统,研究了参数区间不确定迭代学习控制系统(IILC)的单调收敛性条件,并针对常见的离散PD型ILC算法,给出了在l∞范数意义下区间不确定迭代学习控制系统单调收敛性的判断方法,数字仿真结果证明了其有效性。     

基于变异粒子群算法的过程挖掘

为实现过程挖掘,克服标准粒子群算法易陷入局部极值的缺点,提出基于变异操作的粒子群过程挖掘方法。在标准粒子群算法进化中,所有粒子追随最优粒子在解空间搜索,导致种群多样性迅速下降,出现早熟收敛。受遗传算法启发,通过对进化中的粒子增加变异操作,使算法摆脱易于陷入局部极值点的束缚,增强算法跳出局部最优的能力。仿真结果表明,基于变异粒子群算法的过程挖掘在求解的精度和速度方面都得到了好的效果。