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为了研究流体在同一高度的速度和压强分布,首先通过理论推导出同一高度流体的伯努利方程,然后通过流体软件Fluent模拟流体在同一高度的速度压和压强分布,两种方法都得出速度和压强分布相反的结论,即速度大的区域压强小,速度小的区域压强大;由数值模拟还可以得出,流体在管径发生变化处速度和压强大小发生突变;最后,将数值模拟的流体速度和压强结果定量化,代入伯努利方程,通过误差分析,数值模拟结果具有很高的可靠性,因此可以将数值模拟应用于工程实际。 相似文献
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唐军 《宿州教育学院学报》2013,16(4):99-101
应用A3技术和数值模拟软件对1302工作面进行数值模拟,准确查清降落漏斗区域,确定1302工作面流场的渗流矢量极值,计算渗流的速度快,精确度高。根据数值模拟得出的结果,针对1302工作面开采有威胁的富水区分布位置或突水通道采取预处理措施,可以避免开采时发生突发性涌水事故,合理确定防排水设备能力,确保工作面快速推进,高效安全,具有重要的经济和社会效益。 相似文献
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物流配送网络成本的模型研究 总被引:1,自引:0,他引:1
使用一个0,1整数线性规划成本模型对配送网络进行模拟研究,以实现网络系统的总成本最小。在这个成本模型中包含了固定成本、运输成本、运作成本和行政管理成本,通过这个模型可以获得在不同条件下的最优配送网络和最小成本。 相似文献
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自我评估是小学高年级学生理解数学问题的高阶层级。通过观察和分析小学生对数学题目的自我评估与改进发现,小学生在模拟出题解题和自我评估的学习过程中,不仅可以突破数学就是计算的迷思,而且不断提升对于数学问题的理解和表征能力,在考虑数学问题情境之外还考虑数值关系,特别是关注可以合理解题的数值讯息及其关系,并最终达成透彻理解数学题目的内容和结构。 相似文献
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提出了一个具有时滞的SIR计算机网络病毒传播模型。以杀毒软件清理网络病毒所花费的时间周期时滞为变量,通过讨论模型特征方程的根的分布,研究了模型的局部稳定性和Hopf分支的存在性,并利用数值模拟证明了分析的理论结果。 相似文献
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针对中学物理行星轨道的形状问题,用数值模拟方法验证了在不同质量比条件下,行星运行轨道都是椭圆这个规律,可以丰富教师的教学手段,让学生理解计算手段在物理中的重要性。 相似文献
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钱学明 《温州大学学报(社会科学版)》2014,(3):1-11
讨论了一类离散时间的时滞耦合神经网络的同步问题.在参教不确定的离散时间耦合神经网络中,考虑了变时滞和有限分布时滞.同时,细胞激活函数假设为较Lipschitz奈件更为一般的扇形非线性函数,该函数可以既不可微又不严格单调.通过构造Lyapunov-Krasovskii泛函,运用线性矩阵不等式(LMI)技术,并结合Kronecker积来获得耦合神经网络鲁棒全局指数同步的充分性判据,并且所获得的判据依赖于时滞.最后,对一个实例进行仿真,说明结论的有效性. 相似文献
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叶宇光 《泉州师范学院学报》2013,(6):75-78
针对无线传感器网络的DMTS时间同步算法,提出一种基于概率分发的改进算法P—DMTS算法,算法以动态变化的概率发送同步报文,大幅降低了广播同步报文的冗余度,有效节省了网络能耗.最后通过仿真实验验证P—DMTS算法,结果表明该算法对于能耗要求较高,但同步精度要求不是很高的无线传感器网络具有广泛的适用性. 相似文献
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This paper considers the synchronization of solutions for lattices of the coupled non-autonomous Chen system.By using the Lyapunov function,we show that when the second coupled operator is negative definite self-adjoint and its coefficient is suitable large,the Chen coupled lattice system is bounded dissipative(In particular,the solutions for lattices of the coupled autonomous Chen system converge to zero as t →∞).The synchronization between any two solutions of the coupled Chen system can be slaved only by... 相似文献
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On urban arterials, travel time variability is largely dependent on the variability in the delays vehicles experience at signalized intersections. The interpretation of delay evolvement at intersections will give a comprehensive insight into arterial travel time variability and provide more possibilities for travel time estimation. Accordingly, an analytical model is proposed to study delay variability at isolated, fixed-time controlled intersections. Classic cumulative curves are utilized to derive average delay (per cycle) formulas by assuming a deterministic overflow queue. Then, an analogy with the Markov chain process is made to clarify the mechanism of stochastic delays and overflow queues at signalized intersections. It was found that, in undersaturated cases, the shape of the delay distribution changes very little over time, whereas for saturated and oversaturated cases the delay distribution is time-dependent and becomes flatter with an increasing number of cycles. The analysis of arrival distributions, e.g., Poisson and binomial, produces the conclusion that the variability of arrivals has a significant effect on delay estimates in both undersaturated and oversaturated conditions. A larger variance of arrival flow results in a larger variance of delay distribution. All of these analyses can help road authorities to gain insights into arterial travel time variability. 相似文献
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This paper considers the synchronization of solutions for lattices of the coupled non-autonomous Chen system. By using the
Lyapunov function, we show that when the second coupled operator is negative definite self-adjoint and its coefficient is
suitable large, the Chen coupled lattice system is bounded dissipative (In particular, the solutions for lattices of the coupled
autonomous Chen system converge to zero as t → ∞). The synchronization between any two solutions of the coupled Chen system can be slaved only by coefficients in the
x- or y-component for the suitably large second coupled coefficient. Finally, some numerical simulations are given.
Project supported by the National Natural Science Foundation of China (Grant No.10771139) 相似文献
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关于混沌洛伦兹系统和陈系统中的广义投影同步 总被引:1,自引:1,他引:1
1 Introduction Since Pecora and Carroll[1]showed that it is possibleto synchronize two identical chaotic systems , chaossynchronization has been intensively and extensivelystudied due to its potential applications in secure com-munication,ecological systems ,systemidentification,etc.(see [2] and a huge volume of references citedtherein) . Among all kinds of chaos synchronizations ,projec-tive synchronization is one of the most noticeableones .This kind of synchronization was first observedin … 相似文献