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Based on the geometry constraint and dimension-driving technique,a 3-UPU parallel simulation mechanism is created.Then a 3D free surface and a guiding plane of tool path are constituted,with the 3-UPU parallel machine tool combined,a novel 3-UPU simulation parallel machine tool for machining a 3D free surface is created.

通过几何约束和尺寸驱动技术,先建立3-UPU并联模拟机构,再构造任意3D自由曲面和刀具轨迹的引导平面,与3-UPU模拟并联机构合成,得到用于加工任意3D自由曲面的模拟并联机床。

This paper presents a simulation test control system of an airplane engine operating system, which control motor to simulate the force and velocity of throttle lever and the torque on axis.

本文阐述了某型飞机发动机操纵系统地面模拟试验控制系统,它主要控制力矩电机去模拟油门杆上的速度和力以及模拟发动机输入轴的力矩。

The flow stress was repeated by calculated using the "single factor" flow stress formula, the metal machining process was simulated interatively with new flow stress. When simulating value was in good consistent with experimental result, the "three-high" data and flow stress data were obtained.

由&单因素&流动应力公式反复计算与模拟应变率对应的流动应力,基于新的流动应力有限元模拟迭代的进行并追求模拟值与实验结果的一致,获取能反映切削材料力学性能的&三高&数据和流动应力数据。

The FAST (Fatigue, Aerodynamic, Structures and Turbulence) Code was applied to predict loading to a 1.5 MW three-bladed upwind horizontal-axis wind turbine. The output of FAST code containing the specified wind turbine geometric and loading information was transferred to the ADAMS program for turbine blade motion analysis and its structural modal and deformation analysis.

在系统运动模拟部分,用FAST建构出一个1.5MW、3个片、上风式、水平轴式的风,然后将模型转入ADAMS机构模拟软体中进分析与运动模拟,再将FAST和ADAMS分析的结果分别以三种风运转的况个别讨其风转速、转子扭矩、发电机发电,比较后有相当错的结果。

Nowadays in virtue of the developed CFD simulation analysis software—— STAR-CD ,The flow field of the pure water in the half-spirality suction chamber is simulated.

借助于现在发达的CFD模拟分析软件——— STAR-CD 对半螺旋泵吸入室做了纯水的三维模拟分析之后,又在不同含气率的情况下,对半螺旋形吸入室的流场进行了三维模拟分析。

Simulated results show that the model has a better analysis capacity on both time domain and frequency domain, and can also be used in other solar photo-thermal applications.2 Numerical simulation of road snow-melting processThe whole snow-melting process, including the idling process, the snow-melting process and the after-snow process, is simulated.

模拟结果表明,该模型在时域和频域都具有良好的分析能力,而且可以推广至其它有关的太阳能光热应用领域。2道路融雪过程数值模拟在上述温度场分析软件基础上,分别对待融过程、融雪过程和融后过程进行了模拟研究。

In studies of interaction among pile, platform that above it and surrounding soil, this paper employ the concept of plate element to simulate the loading character of platform, and employ the concept of solid element to simulate the character of pile and soil, using the finite element method after understanding the geometry properties of pile, soil and the platform. Analyzing the loading properties of the three entities above and their deformation, this paper also employ a special element, Penalty Element. The introduction of penalty element of this kind has served to guarantee the join harmony of displacement between solid element and plate element, thereby effectively resolving the join problem between platforms, pile that support it and surrounding soil.Considering significant property difference between pile material and its surrounding soil, there may be much shear stress on their contact interface produced under vertical load, thus causing displacement or fission. Therefore it is necessary to adopt one special constitutive law of this kind of contact interface, which can reflect its feature of loading and deformation thoroughly. On the basis of the deformation feature and constitutive laws of some contact interface obtained by Zhang Dongji and people concerned through some single-shear experiments on contact interface between structure and soil, this paper employ one pile-soil three-dimensional constant thickness contact interface model to simulate the " slide" taken place on the interface between pile and its surrounding soil. With this kind model, this paper has also created one finite element model, which can be applied to perform finite element calculation and analyze the pile-loading feature, and deduced its element stiffness matrix.

在承台-桩-土共同作用中,考虑桩与承台的几何特性,采用有限元方法,用实体单元模拟桩土,用板单元模拟承台,更具体地分析桩和承台的受力特性和变形,而且还采用罚单元—既实体单元与板单元之间连接必须满足变形协调条件,来有效地解决了承台与桩土的连接问题,且在桩土共同作用中,由于桩体结构的材料性能与周围土层性质相差较大,在竖向荷载下有可能在其接触面上产生较大的剪应力从而导致错动或开裂,因此,为了充分反映桩土接触面上的受力及变形特征,应采用一种桩土接触面特有的本构关系,即利用张冬霁等人关于结构与土体接触面单剪试验所得到的接触面变形特征及其本构关系,引入桩-土三维等厚度接触单元来模拟桩与桩侧土之间的&滑移&,在此基础上建立可用于桩基承载性状分析的有限元计算单元模型,并推导出了各单元的刚度矩阵。

This paper proposes the scheme of random variable simulation for selling process of enterprise and the model simulating the link of selling and the account receivable of selling process by using Monte Carlo method.

确定了企业销售过程模拟随机变量的选取方案,对企业销售过程中的销售和应收帐款环节建立了蒙特卡罗风险模拟模型,并应用所建立的模型对某企业的销售和应收帐款管理进行了模拟试验。

In order to design optimally a model of screw conveyer which can simulate the separation of silt in Yellow River,the geometry of screw and the forces applied onto the silt particles were investigated in detail,and a horizontal screw centrifuger suitable for silt separation on Yellow River was designed by means of simulation.

为了优化设计一种可以模拟黄河泥沙分离的螺旋输送器模型,较细致地研究了螺旋的几何形状、作用在颗粒上的力以及模拟设计适应黄河泥沙分离用的卧螺离心机,优化分析了各个作用力对分离颗粒的受力情况,然后通过数值模拟螺旋输送器对液流中颗粒的作用状况,简单地分析了液流在螺旋输送器作用下的主要特征及其建模理论。

The tracer migration that the tracer concentration continuously injecting into semi-infinite sand column(initialization velocity is zero) and the pollutant continuously enter into aquifer through a discharging well that completely enter into the dive aquifer are two representative groundwater pollution problems ,Then this paper respectively sets above two decided solution problems and the union simulation problem of groundwater and solute as examples, from the question description, the mathematical model selection and determination, the parameters selecting to carry on the value computation, the read-write of attribute data , visualizes by the IDL programs, carries on the numerical simulation and the visualization post-processing to the above groundwater pollution problems, and according to the numerical solution and the solute migration curves, briefly analyzes and predicts the temporal and spatial distribution features and distribution range of contaminant concentration.

然后分别以半无限长沙柱中连续注入示踪剂浓度的运移、污染物通过一完全进入潜水层的排放井连续进入含水层这两个典型地下水污染定解问题及地下水流和水质联合模拟问题为例,从问题描述、数学模型选取确定、参数选取到运用IDL编程进行数值计算、属性数据读写、可视化,对上述地下水污染问题进行数值模拟和可视化的后处理,并根据数值模拟的数值结果和溶质运移曲线,对污染物浓度的分布范围及随时空变化趋势作了简要分析预测。

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Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气,收缩臀部肌肉;拱起身体,尽量抬起头来,右腿伸直朝向天花板(膝微屈,以避免肌肉紧张)。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化,但却比去年同期高8%。

However, to get a true quote, you will need to provide detailed personal and financial information.

然而,要让一个真正的引用,你需要提供详细的个人和财务信息。