有限元强度折减法在边坡稳定性分析中的应用

采用有限元强度折减法与极限平衡法对边坡的稳定性进行分析,并对两者所确定的安全系数以及滑动面的情况进行比较,解决了极限平衡法不能反映坡体塑性变形趋势以及模拟的滑动面与实际不吻合的问题。     

CFD Analysis of Gas Distributor in Packed Column--Prediction of Gas Flow and Effect of Tower Internals Geometry Structure

Computational fluid dynamics (CFD) simulations were carried out on the gas flow patterns of twin-tangential annular deflector gas distributor in the absence of liquid flow in a packed column (6.4 m in diameter), and the gas flow field in the column was presented close to reality on the whole. Furthermore, after ame-lioration of this gas distributor frame, turbulence energy and turbulence energy dissipation rate were both decreased greatly.Simulation results showed that the flow pattern and the distribution of gas flow were strongly affected by the column bottom frame; the proper column bottom frame could decrease the flow pressure drop greatly. Multifold factors, such as the column bottom geometry structure and distributor structure which affects the distribution capacity, must be considered.     

Computational fluid dynamic simulation of an inter-phasing pulse tube cooler

An inter-phasing pulse tube cooler （IPPTC） consists of two pulse tube units, which are connected to each other at hot ends of the pulse tubes through a needle valve. This paper presents the computational fluid dynamic （CFD） results of an IPPTC using a 2D axis-symmetrical model. General results such as the phase difference between pressure and velocity at cold end and hot end, the temperature profiles along the wall, the available lowest temperature as well as its oscillations and the coefficient of performance （COP） for IPPTC are presented. The formation of DC flow and its effects on the performance of the cooler are investigated and analyzed in detail. Turbulence, which is partially responsible for the poor overall performance of a single orifice pulse tube cooler （OPTC）, is found to be much reduced in IPPTC and its performance is improved significantly compared with the single OPTC.     

Numerical simulation of a direct internal reforming solid oxide fuel cell using computational fluid dynamics method

A detailed mathematical model of a direct internal reforming solid oxide fuel cell （DIR-SOFC） incorporating with simulation of chemical and physical processes in the fuel cell is presented. The model is developed based on the reforming and electrochemical reaction mechanisms, mass and energy conservation, and heat transfer. A computational fluid dynamics （CFD） method is used for solving the complicated multiple partial differential equations （PDEs） to obtain the numerical approximations. The resulting distributions of chemical species concentrations, temperature and current density in a cross-flow DIR-SOFC are given and analyzed in detail. Further, the influence between distributions of chemical species concentrations, temperature and current density during the simulation is illustrated and discussed. The heat and mass transfer, and the kinetics of reforming and electrochemical reactions have significant effects on the parameter distributions within the cell. The results show the particular characteristics of the DIR-SOFC among fuel cells, and can aid in stack design and control.     

CK6132车床主轴组件的模态分析

利用ANSYS对CK6152车床主轴组件进行了模态分析，分析了主轴轴承的刚度、卡盘、工件和尾座顶尖对主轴组件固有频率的影响。     

计算机辅助工程(CAE)发展现状及其应用综述

文章介绍了计算机辅助工程技术的主要发展阶段和技术特征，特别是对ANSYS软件的技术特征和工程应用进行了介绍和讨论。     

ANSYS中一些特殊的网格生成方法

对于复杂模型的有限元分析,为了在"计算精度"和"计算规模"间找到一个"平衡点",或为了简化建模步骤,需要运用一些特殊的网格生成方法.这里介绍了拷贝、移动、镜面映射;网格的拖拉创建几何体;体上扫掠网格的划分;过渡网格划分;自适应网格划分;子模型等方法.灵活合理的运用这些方法可以帮助我们有效的找到"平衡点",建立合适的有限元模型.     

ANSYS软件在门式刚架地震反应分析中的应用

ANSYS软件是融结构、热、液体、电磁、声学于一体的大型通用有限元分析软件。本文借助有限元分析软件ANSYS基本命令和APDL语言对门式刚架这种空间结构类结构在地震波谱作用下的振动状态进行了模拟分析。     

压杆弹塑性失稳的ANSYS分析

阐述了压杆弹塑性失稳的ANSYS分析方法，根据弹塑性屈曲问题的切线模量理论，对材料弹塑性段的应力一应变曲线进行直线化处理，利用ANSYS的非线性屈曲分析方法，对活塞杆进行了屈曲分析，其分析结果与理论分析一致。     

基于ANSYS的受拉平板缺口尖端三维应力状态有限元分析

缺口的应力应变状态对结构的断裂影响很大,是钢结构断裂分析和设计中研究的重点.由于一般构件的几何形状和荷载状态复杂,难于对缺口尖端的应力应变状态得到理论解.利用ANSYS软件对受拉平板缺口尖端三维应力状态进行了有限元分析,获得了钢结构缺口尖端的应力分布规律.