高炉减压阀组有限元模态分析

为了掌握高炉减压阀组的振动特性,提高减压阀组抗振性,以某厂的高炉减压阀组为研究对象,利用SolidEdge软件建立三维模型,ANSYS - Workbench软件建立有限元模型,通过有限元计算,对其进行模态分析,得到减压阀组前六阶固有频率和振型,并提出改进措施,为减压阀组结构改进提供了理论依据.     

大型直线振动筛横梁结构有限元分析

采用ANSYS有限元软件对某人型直线振动筛横梁结构进行了模态分析和谐响应分析,计算出了该振动筛的前10阶固有频率;并对该振动筛进行了谐响应分析,获得了稳态下横梁的动应力和动位移分布规律,这对于指导起重机的设计、制造、检验、管理与故障分析郁具有很重要的意义。     

热矿振动筛筛箱故障有限元分析和改进

应用有限元分析软件ANSYS对安钢烧结厂SRZ3175型热矿振动筛筛箱侧板上产生的裂纹,进行了静力学分析和动力学分析,重点研究了该裂纹形成的机理,并提出了改进措施,对改进后的筛箱结构重新进行的有限元分析结果表明,改进取得了明显效果。     

中间包结构有限元分析

介绍了某钢厂中间包结构存在的问题,简要论述了中间包产生变形和裂纹的机理.利用数值模拟的方法对中间包结构强度和刚度进行有限元分析,通过计算所得的中间包温度场和应力场,显示中间包结构高应力区和强度的薄弱位置,提出改进方案.此外还改变中间包的耐火材料层的厚度和综合导热系数,分析这些因素对中间包温度场和应力场的影响,为中间包结构的优化提供理论支持.     

板梁组合结构的有限元分析

本文应用ANSYS有限元分析软件对板和T型材组合结构采用多种不同的构模方法,分析在相同载荷和边界条件下各种不同构模方法的计算结果的区别,从而给出了应用该软件在船舶结构分析中应采用的构模方法。     

烧结振动筛故障的分类与有限元分析

采用ANSYS软件对振动筛的筛体进行有限元计算分析．确定了筛箱的应力、应变分布规律，对筛体两侧振动不同步和筛体产生裂纹的原因进行了分析。     

尼尔森选矿机离心锥的有限元分析研究

尼尔森选矿机是分选回收目标矿物的一种新型高效离心重选设备,其分选的关键在于离心锥。研究应用有限元方法对离心锥的结构进行静力学和动力学特性分析,采用ANSYS软件完成计算。计算结果表明,工况下内锥的应力分布比较均匀,最大变形出现在分选部分,离心锥的静力结构满足强度和刚度要求,但也存在比较薄弱的部分。随着离心锥频率的增大,其主要变形由大端逐渐转移到中间部分,且内锥的变形比较剧烈,但尼尔森选矿机的设定转速小于各阶临界转速,因此离心锥的结构动力学特性基本满足要求。对尼尔森选矿机离心锥的有限元分析结果可以为设备的设计和改进提供借鉴。     

CSP生产线F3轧机振动有限元模态分析

国内某钢厂CSP生产线生产2.0mm带钢时F3轧机出现异常振动.为查找振动原因,对其进行三维建模,并由此建立轧机整体有限元模型,通过节点耦合方式实现内部联接,得到轧机前15阶固有频率和振型.分析结果对轧机的设计与分析有一定的参考价值.     

飞剪剪切机构的模态分析

某轧钢厂切头飞剪机为曲柄摇杆机构,使用2年后,曲柄轴发生断裂。分析发现其静强度满足要求,考虑到飞剪剪切是一个动态过程,建立了剪切机构模型,进行模态分析。计算得到剪切机构在最大剪切力出现位置时的前10阶固有频率,第一阶固有频率为264．19Hz,而剪切机构的工作频率为12Hz,因此,飞剪剪切时不会发生共振,曲柄轴断裂是热处理不当造成的。     

Finite Elements on Generalized Elastic Foundation in Timoshenko Beam Theory

Using the Vlasov foundation model, a modified approach of the continuous beam on elastic supports, leading to both a mechanical model and the proper foundation parameters of the generalized foundation is shown. Two formulations of the beam finite-element with shear deformation effect, resting on a two-parameter elastic foundation, characterized by distinct contributions of normal and rotary reactions are presented. The behavior of the second foundation parameter in the two formulations is governed by the bending cross section rotation of a beam. The first formulation, yielding a free-of-meshing stiffness matrix and equivalent nodal load vector, is based on the transcendental or “exact” solution of the governing differential equation of the beam resting on the elastic layer of constant thickness. Considering a linear variation of the layer thickness along the beam, the second formulation is based on the assumed polynomial displacement field. Numerical comparisons with the exact approach show that the cubic formulation leads to better results when the foundation parameters are variables. The practical utility of the analogy between a tensile axial force and the second foundation parameter is exemplified, too.     

Model Uncertainty in Finite-Element Analysis: Bayesian Finite Elements

In this paper, probabilistic models for structural analysis are put forward, with particular emphasis on model uncertainty. Context is provided by the finite-element method and the need for probabilistic prediction of structural performance in contemporary engineering. Sources of model uncertainty are identified and modeled. A Bayesian approach is suggested for the assessment of new model parameters within the element formulations. The expressions are formulated by means of numerical “sensors” that influence the model uncertainty, such as element distortion and degree of nonlinearity. An assessment procedure is proposed to identify the sensors that are most suitable to capture model uncertainty. This paper presents the general methodology and specific implementations for a general-purpose structural element. Two numerical examples are presented to demonstrate the methodology and its implications for probabilistic prediction of structural response.     

辊径比对带钢轧制平直度影响的有限元模拟分析

采用大变形弹性有限元法,借助MSC.Marc有限元软件,建立了昆明钢铁公司双机架紧凑式可逆炉卷轧机轧制过程的二维模型,对C45(0.43%～0.49%C)钢的2 mm×1200 mm带钢轧制平直度进行模拟。对带钢沿宽度方向上的应力分布进行三维模拟,得出上、下工作辊的辊径比对带钢平直度的影响。结果表明,当辊径比为420/418.5时,带钢的平直度最佳。     

偏心激励对单质体振动筛摆振的影响

通过对具有分布质量的单质体多自由度刚性板式力学模型的分析，研究了偏心激励与结构非对称引起的单质体振动筛的摆振问题，求得了横向非对称结构的固有频率和动态响应的解析解，并结合实例讨论了结构参数对振动筛项响特性的影响，得到了新结果．     

100t电炉炉壳吊具结构的有限元分析与设计

电炉炉壳吊具结构异形、体积庞大,采用传统类比设计方法进行初步设计,再通过SolidWorks软件对炉壳吊具进行三维建模和有限元分析,并对其结构安全性和自重进行优化,最后不仅满足了吊具的安全可靠,同时减轻了吊具的质量。     

Effective Hybrid/Mixed Finite Elements for Folded-Plate Structures

A new formulation in which the assumed stress field is divided into membrane and bending stress fields is developed. A family of effective shell elements of hybrid/mixed finite element method that accounts for transverse shear deformations is proposed based on a modified Hellinger–Reissner variational principle. In this paper, the present shell elements possess different three-field assumptions, which are described by compatible displacement, incompatible displacement, and stress fields. Several benchmark problems are conducted to test both the accuracy and reliability of the proposed shell elements. Numerical analyses show that the present shell elements pass all the patch tests, do not contain any spurious zero energy modes, and have no lock phenomena even for very thin plate and shell. Further insight into the performance of the present shell elements is gained to demonstrate the high accuracy of the elements by several folded-plate structure problems. The numerical results demonstrate the validity, reliability, and applicability of the present elements. The present elements are valid for thick as well as thin shell structures.     

25kJ液压模锻锤工作状况下试验模态分析研究

采用基于ODS的测试方法对25kj液压模锻锤机身系统进行试验模态分析,采用Vib’SYS振动信号采集、处理和分析软件,由试验数据识别出机身系统的模态参数及其振型图,找出了机身系统的薄弱环节及需要注意和改进的地方。