数学模型

The flow pattern and flow field in the energy dissipater in tunnel are simulated with the two-dimensional numerical model under different operating conditions.

通过比较各种追踪自由面的方法，选择了流体体积法来模拟自由水面，并与RNG k-ε紊流模型耦合建立了无压隧洞内消能工的水气二相流数学模型。

During the numeric model processes, the finite element method is used to build the discrete model and analytical theory of the rotor-bearing system. The entire system is divided into several dividable substructures, each of which develops individual systematic mathematic model. Finally, the motion equation of whole structures is combined by the integrity of the dynamic variables and force balances on connections of each substructure.

在数值建模过程中，以有限元素法为基础，建立转子-轴承系统之离散模型与分析理论，将整个系统结构划分成若干个可分离部位的子结构系统，并发展子结构的个别系统数学模型，最后整体结构的运动方程式再以各子结构结合面上节点的动态参数一致性及力系平衡进行结合。

Secondly, the vector control theory,the kinematics model and the sinusoidal space vector Pulse-Width-Modulation control technology were analyzed dividually, and then the mathematic simulation model of the servo system of PMSLM was built.

其次，综合运用电机控制理论和计算机仿真技术，分别对永磁同步直线电机的矢量控制原理、运动力学模型以及电压空间矢量脉宽调制技术进行分析，搭建了永磁同步直线电机伺服控制系统的数学模型。

Whether there is a significant effect of surface thermal conductivity on heat transfer coefficient in dropwise condensation is a problem that has yet not been settled hitherto.

本文的主要研究工作如下：（1）应用随机分形模型构造了液滴的空间和尺度分布，在此基础上首次建立了珠状凝结换热数值模拟的数学模型。

The emphasis is laid on the geometrical structure and mechanization of electrostatically supported gyro monitor . Its mathematic and error models are derived in detail and its self—alignment is solved also.

重点阐述了静电陀螺监控器的几何结构和工作原理，详细推导了其数学模型和误差模型，解决了其初始自对准的问题。

Physical and numerical models were establishedased on NˉS c ontrol equations and RNG kˉεturbulence model, the interior flow fields of the nozzles were analyzed through num erical method, both the flow parameters change trend and thrust speciality of the asymmetry quadrate nozzle were resea rched.

文中建立了非对称方形尾喷管及传统轴对称尾喷管的物理数学模型，基于N S方程和RNG kε湍流模型，对两种尾喷管三维内流场进行了数值分析，研究了非对称方形尾喷管内部流动参数的变化趋势及其推力特性。

Then, gasification experiments of high ash melting point coal with dry pulverized coal feeding were carried out on the gasification test system, the flame images were observed to validate the feasibility of flameless gasification inside the gasifier, temperature distributing inner the gasifier and syngas components were measured under different / atom ratio and steam/coal ratio conditions.

进而，建立煤粉气化炉的物理和数学模型，运用概率密度函数方法对高灰熔点煤在基于无焰氧化的煤粉气化炉内的气化过程进行了模拟计算，参照小试的试验工况，验证了气化炉模型；分析了不同氧碳原子比、蒸汽煤比和气化压力对高灰熔点煤气化特性的影响，并可视化地研究在典型工况下高灰熔点煤在该气化炉中气化过程，为进一步炉型结构和气化工艺的优化设计提供依据。

This model considers more factors, especially great and complex effect of geological factors on grouting spread, Value of fissure aperture is cleared and defined, all kinds of parameters of geology and grouts property in connection with model can be tested accurately, therefore this approach practice more and have more practical value comparing with other grouting model to provide solid theoretical basis for grouting controlling method.

在频率水力隙宽和宾汉流体的渗流规律的研究成果基础上，考虑地下水影响半径、频率水力隙宽、粘度时变性、裂隙的倾角和方位角、流核等诸多影响因素，建立了牛顿流体和宾汉流体的注浆扩散模型，并对数学模型实现了计算机模拟，便于工程实际中的应用。

Testing for"K"、diffusivity"D"of wetland soil transmissivity and simulation of hydrologic processes of typical wetlands are made based on the indoor dynamic modeling experiment and the mathematic model simulations. The hydrologic response of river distinguish form that of the wetlands. And this is because that wetland has special hydrologic functions. The hydroperiod of wetlands is coincident with the precipitation period of watershed.

通过室内动态模拟实验测定了不同断面沼泽土壤的导水率K和扩散率D，水文数学模型RMA2模型和GIS相结合模拟了典型沼泽湿地的水文过程，河流和沼泽湿地的水文响向应具有明显的差异性，这是沼泽湿地水系统具有特殊水文功能的基础，沼泽的水文周期与流域降水周期是一致的。

The paper presents work principium of hydropneumatic elevating-equilibrium mechanism , and the mathematical model for balance of elevating-equilibrium mechanism was proposed, the design model was solved by using Maximum-minimize Method in MATLAB optimization toolbox and optimum procedure was presented.

对液体气压式高平机的工作原理进行了介绍，建立了高平机的平衡作用数学模型，应用MATLAB优化工具箱中的最大最小化方法对设计模型进行了优化求解，给出了高平机的结构优化程序，计算结果表明该方法是正确和有效的，并且适用于火炮平衡机等类似结构的优化设计中。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷