查询词典 stochastic dynamic programming

Initially, assuming that the contact between cam and tappet is"dry contart", a dynamics model of Hertzin contact stiffness and impact damping is established. Next, with dynamic load on cam—tappet pair from the model, an analysis is made both to unsteady EHD oil film in cam—tappet pair under condition of full and partial lubrtication and to wear characteristics of cam profile. then, according to the fact that the lubrication in cam—tappet contact surface is EHD lubrication, taking the interaction between stiffness and damping of unsteady EHD oil film and rigidity of solid object contact into account, a dynamics equation of valve train relating to the dynamic effect of EHD oil film is built up and solved. Consequently, a further study is made on the dynamic characteristics of valve train under interaction of EHD oil film dynamic behavior and the problem of EHD lubrication in cam—tappet pair. Finally, the dynamic effect of full and partial EHD oil film is studied accordingly.

首先，通过对凸轮—挺杆接触为&干接触&的假设，建立了考虑赫兹&接触刚度&和冲击&阻尼&的配气机构动力学模型，用由此求得的凸轮—挺杆表面动载荷对凸轮—挺杆进行了全膜状态和部分膜状态非稳态弹流润滑分析，并研究了凸轮轮廓的磨损规律；然后，是在凸轮挺杆表面存在弹流动压油膜这一事实的基础上，相当于在动力学方程中考虑非稳态弹流油膜的&刚度&、&阻尼&和固体接触&刚度&的耦合作用，建立并求解了考虑弹流润滑行为动力学效应的配气机构的动力学方程，从而深入地研究了弹流润滑行为与动力学行为耦合作用下的配气机构动力学特征以及凸轮挺杆弹流润滑问题；作为前面工作的对应部分，考虑弹流油膜动力学效应的研究工作也同样分为全膜状态和部分膜状态进行。

Through careful analysis of the mathematics model of daily dispatching optimization of the cascade hydropower station, a new method based on the combination of two dimensional dynamic programming and discrete differential dynamic programming is proposed.

通过仔细分析梯级水库日优化调度的数学模型，提出了一种基于二维动态规划和离散微分动态规划相结合的混合求解策略，该策略理论上严谨，计算时间比较短，能满足日常调度的需要。

In order to make available for alternative Aiming bidding curves,improve the speed,precision and convergence, an effective method for generation scheduling is proposed based on an improved dynamic programming- local redefined dynamic programming .

为有效解决各种类型报价曲线的负荷经济分配，并考虑到计算速度、精度及收敛性等问题，采用了一种改进的动态规划法——局部加密动态规划法，并采取了限制机组组合状态的措施。

It elaborates the multistage dynamic programming model of section decisive process optimization problem, and usually the essential f actor that contained. It be given two prerequisites of problem that may solve with dynamic programming" the optimum son-structure with no rear effect ".

阐述了一个多阶段决策过程最优化问题的动态规划模型通常包含的要素，给出了一个用"动态规划"可以解决问题的两个先决条件："最优子结构"与"无后效性"。

In view of complicated decision-making problems in enterprises, a multi-dimension and multi-objective fuzzy optimum dynamic programming model is established. Furthermore, RAGA and dynamic programming are combined for solution, which may guarantee the optimum variable.

根据企业所面临的复杂的投资决策中的问题，建立了多维多目标模糊优选动态规划模型，并将遗传算法与动态规划法相结合进行求解，保证了优化变量的解的全局最优性。

The conclusion is:multiobjective programming and fuzzy programming are superior to the traditional Markowitz model,compart:s the dynamic models with the static models,the former can reponse more soon to the wave of the stock price,so we can adjust period by period based on the dynamic models.

本文得出的结论是：多目标规划及模糊规划等方法优于传统的马柯维茨模型，在实证检验中表现出更高的投资效率，动态的模型与静态的模型相比，能更快地对股价波动作出反应，可进行逐期调整。

It also eliminates the invalid paths between statuses considering the restriction of minimum continuous time of on and off , and tamps rates , thereby reducing the number of paths in dynamic programming and attaining the aim of reducing dimensions . After confirming the running or suspended status of units , the approach is used to distribute powers among units , thereby increasing the efficiency of dynamic programming greatly .

通过比较各时段负荷及机组参数，剔除各时段下不满足要求的组合状态，从而减少动态规划中的状态点数；根据机组的最小连续运行，停运时间限制，计及机组功率上升，下降速度的约束，剔除了状态点间的无效路径，从而减少了动态规划的路径个数，达到降维的目的；在确定机组启停状态后，再采用解析法进行机组的功率分配，可以大大提高动态规划方法的效率。

Studies on statistical properties of spontaneous spike trains of single auditory nerve have shown that the distributing patterns of interval in spike trains represent Poisson distribution. Since Poisson distribution is one of the simplest stochastic processes, previous studies on spontaneous spike trains of single auditory nerve were performed primarily by assuming them as stochastic processes. Recently, further studies on nonlinear dynamic system show that we have not enough evidence to demonstrate the process, whose distribution of probability density is exponential, is Poisson process.

中文题名豚鼠听神经单纤维放电序列的非线性特性分析副题名外文题名 Analysis on nonlinear properties in spike trains of single auditory nerve fiber in guinea pig 论文作者林龙年导师孙心德教授学科专业生理学研究领域\研究方向听觉神经生物学学位级别博士学位授予单位华东师范大学学位授予日期2001 论文页码总数91页关键词听神经听觉神经生理豚鼠馆藏号BSLW /2001 /Q42 /41 对听神经单纤维自发放电序列的统计特性研究表明，听神经单纤维放电间隔呈泊松分布，而泊松过程是最简单的随机过程之一，因此以往的研究主要将听神经单纤维自发放电序列作为随机过程来处理。

Thus far, little has been known for the extreme value distribution of general structural dynamic stochastic responses, except for some special results, say, the Rayleigh distribution in the case of narrow - banded Gaussian stochastic processes.

由于基于首次超越破坏准则的结构动力可靠度问题可以转化为相应动力反应极值分布的积分问题，获取结构动力随机反应的极值分布具有重要的意义川。

The dynamic characteristics of stochastic truss structures and stochastic frame structures are analyzed by using Random Factor Method. Then, from the expressions of structural random response of the frequency domain, the computational expressions of the mean value, variance and variation coefficient of the mean square value of the structural displacement and stress response under the stationary random excitation or non-stationary random excitation are developed by means of the random variable's functional moment method and the algebra synthesis method.

考虑压电智能桁架结构物理参数、几何参数、结构阻尼和外荷载、闭环系统控制电压分别或同时为随机变量，构建了结构在随机力作用下的动力响应分析模型，提出了求解方法，推导出结构动力响应随机变量的数字特征计算表达式，通过算例验证了所建模型和所提求解方法的正确性和有效性。

For the head-teacher of the class said that I had seriously broken the school rules,which led me to a three-day suspend class.

为什么呢？因为我的班主任说我严重的违反了校规，于是让我停课三天。

Many of them believe that the conversion of thousands of working-class folk in England spared that nation from the mass carnage and the tyranny that came with the revolution in France.

他们之中有许多人相信，在英国数以千计的劳工阶级之悔改信主使英国免於遭受如法国大革命所造成的大屠杀和专制暴政。