共查询到20条相似文献,搜索用时 125 毫秒
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本文介绍了某网格筋壳片的冲压拉伸成型过程的有限元模拟分析。通过采用不同算法的有限元模拟分析软件平台,对该产品的冲压拉伸成型过程进行了必要的模拟计算分析,对产品的结构、工艺和模具设计起到了指导作用。 相似文献
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振动现象是机床设计中所面临的问题之一,它能造成加工误差,影响零件的加工精度。模态分析主要用于确定结构或机器部件的振动特性。本文建立了某型立铣床床身的三维有限元模型,并利用大型有限元分析软件ANSYS进行了模态分析,得出了床身前十阶固有频率和振型。 相似文献
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振动现象是机床设计中所面临的问题之一,它会产生加工误差,影响零件的加工精度。模态分析主要用于确定结构或机器部件的振动特性,本文建立了某型立铣床床身的三维有限元模型,并利用大型有限元分析软件ANSYS对其进行模态分析,从而得出床身前十阶固有频率和振型。 相似文献
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为保证900 t 移梁机的作业安全,利用ANSYS 有限元软件建立移梁机整体空间模
型,基于作业工况进行有限元分析。介绍了900 t 移梁机的结构组成、功能特点和作业工况,提
出了移梁机有限元模型的建模原则与方法。结合各种作业工况进行移梁机有限元仿真分析,得到
不同工况下等效应力和结构变形云图,并将仿真计算结果与试验数据进行了对比分析。结果表明,
利用上述建模原则得到的有限元仿真分析结果与试验数据较为吻合。最后分析了个别有限元结果
与试验数据存在偏差的原因。研究结果可为移梁机的设计制造提供借鉴指导。 相似文献
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建立深海旋转轴O型橡胶圈动密封结构三维模型,采用ABAQUS /Explicit非线性有限元方法计算了O型橡胶圈在工作水压和工作转速下的接触压力。通过这些研究,确定了O型橡胶圈接触压力的分布规律,分析了水压和工作转速等典型参数对密封性能的影响。 相似文献
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研究运输状态下路面等随机振动因素对发射装置结构可靠性的影响,为发射装置的设计与结构优化提供参考。分析了行军状态路面振动的特点,据此建立了弹架系统的四自由度离散模型,对模型系统的响应谱密度进行了理论推导;对某型导弹发射装置中的起竖臂建立有限元模型,进行有限元形变和应力分析;根据有限元结果,分析了起竖臂在行军状态下刚、强度... 相似文献
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张军 《计算机光盘软件与应用》2013,(22):107-107,109
基于有限元分析软件ANSYS,建立了MT-2型缓冲器重要结构楔块的有限元模型,并对其进行网格划分、加载和计算,分析楔块在车钩缓冲系统缓冲列车最大压缩冲击时的应力场,并校核楔块的强度。结果显示,楔块符合强度设计要求。 相似文献
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张军 《计算机光盘软件与应用》2013,(23):115-115,117
建立了MT-2型缓冲器中心楔块的有限元模型,利用有限元分析软件ANSYS完成建模、网格划分、加载和计算,分析了中心楔块在车辆极端冲击条件下的应力场,并校核强度。结果显示,中心楔块在缓冲器承受冲击压缩状态时符合强度设计要求。 相似文献
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对三维有限元模型快速有效地生成任意剖面上等值线及彩色云图,是有限元计算后处理中的一个重要技术。该文在建立单元信息描述表的基础上,提出了一种适合于任意三维实体单元类型的通用剖切算法,和在剖切面及外表面生成等值线或高质量彩色云图的方法。 相似文献
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《Computer Methods in Applied Mechanics and Engineering》2005,194(48-49):5083-5106
This paper describes an algorithm to extract adaptive and quality 3D meshes directly from volumetric imaging data. The extracted tetrahedral and hexahedral meshes are extensively used in the finite element method (FEM). A top-down octree subdivision coupled with a dual contouring method is used to rapidly extract adaptive 3D finite element meshes with correct topology from volumetric imaging data. The edge contraction and smoothing methods are used to improve mesh quality. The main contribution is extending the dual contouring method to crack-free interval volume 3D meshing with boundary feature sensitive adaptation. Compared to other tetrahedral extraction methods from imaging data, our method generates adaptive and quality 3D meshes without introducing any hanging nodes. The algorithm has been successfully applied to constructing quality meshes for finite element calculations. 相似文献
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散乱分布数据曲面重构的光顺-有限元方法 总被引:5,自引:0,他引:5
提出了一种基于散乱分布的数据点重构三维曲面的有限元方法.根据最佳逼近与数据光顺理论建立正定的目标泛函,采用有限元最佳拟合使泛函极小化,求得最优解.通过八节点等参数有限元插值计算,重新构造出三维曲面.这种光顺-有限元方法有效地抑制了输入数据上误差噪声的影响,与有限元拟合方法相比,所需的输入数据点少,重构的曲面逼近精度高、光顺性好.数值实验表明,该方法简单,便于应用. 相似文献
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This paper addresses the bending and free vibrations of multilayered cylindrical shells with piezoelectric properties using a semi-analytical axisymmetric shell finite element model with piezoelectric layers using the 3D linear elasticity theory. In the present 3D axisymmetric model, the equations of motion are expressed by expanding the displacement field using Fourier series in the circumferential direction. Thus, the 3D elasticity equations of motion are reduced to 2D equations involving circumferential harmonics. In the finite element formulation the dependent variables, electric potential and loading are expanded in truncated Fourier series. Special emphasis is given to the coupling between symmetric and anti-symmetric terms for laminated materials with piezoelectric rings. Numerical results obtained with the present model are found to be in good agreement with other finite element solutions. 相似文献
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针对反应堆堆芯围筒热流固耦合问题,采用三维有限元法研究堆芯围筒的热变形.考察ANSYS的三维实体热单元SOLID 70,三维实体单元SOLID 45,三维表面热效应单元SURF 152和三维热-流耦合管单元FLUID 116等单元类型的特点和实用性.建立堆芯围筒、吊篮和冷却剂的温度分析有限元模型:堆芯围筒和吊篮采用SOLID 70,结构表面与冷却剂的对流传热表面采用SURF152,堆芯围筒与吊篮之间冷却剂采用FLUID 116.采用SOLID 45建立堆芯围筒有限元模型,根据得到的堆芯围筒、吊篮和冷却剂的温度场结果分析堆芯围筒热变形.结果表明,在考虑堆芯围筒及吊篮固体和流体的交叉耦合的基础上,采用三维有限元法能比较客观地模拟反应堆堆芯处的复杂运行环境. 相似文献
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Mianbin ZhengGuohua Chen 《Computers & Mathematics with Applications》2011,62(1):333-341
The loadings on high temperature components are generally complex and the discreteness of the material strength is usually great. Therefore, the two-dimensional (2D) failure probability analysis model and the deterministic finite element method (DFEM) cannot be applied to evaluate the failure probability of asymmetrical three-dimensional (3D) components. To overcome the drawbacks of the 2D model and the DFEM, an efficient 3D stochastic finite element method (SFEM) is proposed in this paper. With this method, the failure probability of components subjected to complex loadings can be estimated by using the statistical analysis of the Von Mises stresses of element nodes. Meanwhile, ANSYS and MATLAB were employed to carry out 3D parametric modeling, solving and statistical analysis. The proposed method is efficient, as is verified for two cases, and it can also be easily applied in practical engineering. 相似文献
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《Advances in Engineering Software》2010,41(6):838-858
When conducting a finite element analysis (FEA) one way to reduce the total number of degrees of freedom is to use a mixed-dimensional model. Using beam elements to model long and slender components can significantly reduce the total number of elements. Problems arise when trying to connect elements with different dimensions in part due to incompatible degrees of freedom between different types of finite elements. This paper focuses on problems that occur in coupling beams and solids, which means coupling 1D and 3D finite elements. This paper presents a mesh-based solution to these problems only using specific arrangements of classical 1D and 3D finite elements without requiring the use of additional constraint equations. Two alternative solutions are detailed, evaluated and compared in this paper through series of computational experiments. The implementation of both solutions is also presented and involves mesh and geometry processing operations along with an adaptation of boundary representation (BREP) classical data structures. 相似文献
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一种大型三维有限元网格的显示和高效消隐方法 总被引:4,自引:0,他引:4
本文提出了一种面向AutoCAD的大型三限元网格的显示和高效消隐方法,可实现8-20个节点三维正确显示,并大大节省消隐的运算时间。 相似文献
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提出了一种三维有限元分析结果可视化方法,采用透明效果,将高应力区表示为不透明实体,低应力区表示为透明实体。这样我们能够直接观察高应力区的三维图象,即高应力区的表面形状及其深度。 相似文献