数学模型

The research results show that renewal theory can be used to direct the policymaker of the vehicle maintenance and repair and it is very effective to simplify the mathematical models and the solutions to the models.

研究结果显示：更新理论完全可用于指导车辆的维修决策，而且对简化问题的数学模型及模型的解非常有效；运行试验的验证结果表明，基于更新理论和更新函数所建立的车辆最优维护周期数学模型的解是准确、可靠且符合实际的。

In this paper, the mathematical models, the numerical methods and the kinetic mechanism were systemically studied and improved to meet the requirement. The renormalization group k-εturbulence model was adopted to simulate in-cylinder flows in this article.

本文在三维数学模型中嵌入了化学动力学反应模型，构建了能够深入研究天然气燃烧反应机理、了解天然气发动机燃烧过程的数学模型。

School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China）Abstract: Mathematic model of the tiny terrain covered cobalt-rich crust and the cutting process of mining head's cutting tooth were established by considering the force of sea water, and simulation software was developed by GUI tool of Matlab software to study the distributive properties of maximum load of the cutting tooth.

摘 要：考虑海水力的作用，建立深海钴结壳微地形的数学模型和采矿头截齿切削过程的数学模型，应用Matlab软件GUI工具编制相应的仿真程序，并通过实验验证仿真模型的正确性和仿真软件的工程有效性。

So the respiratory physiology a hydrodynamics is the base of studying how gas convect and diffuse in the hi In this paper, we introduce the physiological structure and the process of | convection and diffusion in the lung. After analyzing some kinds mathematical model, we have got a digital model through simplifying l Weible model.

本文介绍了肺体的生理结构以及气体在肺内的传输和扩散过程，通过对现有几种数学模型的分析后，在Weible肺解剖模型的基础上简化得到肺的一维喇叭口数学模型，把气体在三维空间传输和扩散问题转化为一维问题。

The efficiency of an closed epicyclic gear train is analyzed by means of this formula, some of efficient curves are drawn, and an adequate selecting range of transmission ratio is found.

推导出了动力学模型中惯性元件、弹性元件和分支节点的动力学分析的数学模型，用传递矩阵法建立起封闭周转轮系动力学分析的数学模型。

Through the experiment results, in different phonation model, analysis the properties of glottal vocal efficiency, vocal folds vibration, and voice source.

我们在对嗓音—呼吸系统进行自动分割与分段特征表达的目标指引下，建立了具有国内一流水平的嗓音声学实验室；从概念上对嗓音—呼吸系统重新划分，以声门为中心分别建立去耦合和弱耦合条件下的嗓音—呼吸系统和肺胸系统数学模型；采用离体犬喉作为声带振动的物理模型，对数学模型进行完善与证实；采用盲解卷技术在去耦合和弱耦合条件下，提取上下声道传递函数、嗓音源和发声效率，研究上下声道去耦合和弱耦合条件下不同发声方式与状态对发声效率的影响。

On the basis of engine idiocratic mathematical model, using the origin underway accelerate time and the oil consumption at the cycle of multi-working conditions as the objective functions of the power performance and the economy performance respectively, and then transform it to a single objective function by using the linear adding.

在建立发动机特性数学模型的基础上，以原地起步连续换档加速时间和多工况循环使用油耗作为衡量动力性和燃油经济的2个分目标，采用线性加权组合的方法将其转换成单一目标函数，建立了汽车动力传动系优化数学模型，利用惩罚函数法对此模型进行了优化，实例计算表明，应用该方法对汽车动力传动系进行优化匹配分析时，整车综合性能均有显著改善。

Then, the theme provided efficient layout solutions to those accessories of layout-storage with niched genetic algorithm as a tool: through establishing the mathematical model of layout-optimizing problem...

在此基础上，用基于小生境技术的遗传算法对排样库中的零件进行排样：先建立优化排样的数学模型，根据该数学模型将多边形在矩形板料上的排列方式转化为特定的编码，并建立编码和和排样方式的映射模型，然后采用基于小生境的遗传算法对排样过程进行优化。

Based on the analysis of the feature for the fly-by-wire of aircraft, the mathematical models of the aircraft and the fly-by-wire are established; the probability model of contingency in the fly-by-wire and pilot tamper probability model are also established; by the application of Markov Chains the flight security model is upbuilt.

在分析飞机电传操纵系统特点的基础上，建立了飞行器和电传操纵系统的数学模型，建立了电传操纵系统故障及飞行员干预的概率模型。应用马尔可夫链建立了人-机系统飞行安全可靠性的数学模型。

Therefore, it will help to resolve the water pollution discordance. On the basis of assessing economic loss due to water pollution, this paper employed water environment model to describe the spatial impact of pollutant discharge in rivers. In consideration of the environmental and economic effects of pollutant discharge, a theoretical model for water pollution compensation in rivers was proposed, with its basic characteristics, processing methods and application conditions discussed in the paper.

在水污染经济损失评估的基础上，以河流为研究对象，采用水环境数学模型的方法描述了污染物排放的空间影响关系，进而把超量排放的环境影响与经济影响联系起来，对模型的基本特征、处理方法和应用范围进行了讨论，并且以太湖流域范围内的京杭运河为例进行实证研究，得到了河流水污染损失补偿的数学模型。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。