共查询到18条相似文献,搜索用时 93 毫秒
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注塑CAE常用的数值解法有边界单元法、有限单元法和有限差分法等,但这些解法都需要对所建立的模型进行单元网格划分,网格的好坏、疏密直接关系着CAE分析的效率.因此,网格模型的优化就成为CAE分析的一个关键环节.
一、几何模型的简化
由于软件功能的不同要求,注塑CAE模拟分析的网格模型往往与CAD设计的模型不完全一样,通常为了更为有效地进行模拟分析,在进行CAE的模型构建过程中,往往需要对模具的CAD模型中的一些细节进行简化运算. 相似文献
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针对CAE工程分析中网格模型的特点,提出了一种符合CAE特点的网格模型特征重建方法。鉴于CAD模型中的设计细节在CAE分析中可以忽略的特点,对CAD模型中的小圆角、倒角、小凸台等非结构性设计特征,采用基于面片法矢迭代滤波方法进行识别和滤除。算法首先识别出这些特征区域,然后根据非特征区域面片法矢调整特征区域法矢并更新顶点坐标,进行特征重建,最终得到符合CAE要求的网格模型。 相似文献
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《计算机辅助设计与图形学学报》2017,(4)
不同于已有的从CAD模型出发构建体参数化模型的思路,为了进行等几何分析,从二维有限元四边单元网格模型出发,重建该网格模型对应的参数化模型.首先利用现有CAE软件生成有限元四边单元网格模型;然后进行网格预处理提取单元之间的拓扑信息,并依据规则实现网格单元规范合并、子域自适应合并、子域边界生成等操作,生成多个零亏格四边子域;最后利用边界插值算法和内点优化算法实现子域参数化.通过多个实例验证了文中算法的有效性;为有限元网格到体参数化模型的转换提供了技术支持,进而为实现海量的CAE模型参数化及其等几何分析提供了一条便捷的途径. 相似文献
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汽车减震器橡胶连接件静刚度有限元分析 总被引:2,自引:0,他引:2
在汽车悬架设计中,汽车减震器与车体的连接多采用橡胶-钢零件作为弹性万向节,由于橡胶本身的超弹性以及零件模型的几何非线性,在较大变形的有限元计算中造成网格扭曲与畸形,为了改善车辆的乘适性,在动态冲击下达到减震降噪作用.重新划分网格进行计算是解决问题的一种途径.根据Abaqus非线性有限元分析软件中的CAE和Python模块,给出了网格充分计算基本流程.采用上述方法对汽车减震器的橡胶连接件的垂向和偏转静刚度进行了有限元计算,并与实验对比,有限元计算的误差不超过5%. 相似文献
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复杂形体的体信息提取及自适应网格剖分算法 总被引:2,自引:0,他引:2
在机械零件的计算机辅助分析(CAE)过程中,准确、高效地确定计算区域的空间位置并进行网格划分,对于CAE系统的完善性,体图形学及科学计算可视化的发展,都具有十分重要的意义,文中基于LMT的思想方法,提出一种从表面数据模型出发,提取空间体信息,建立体几何模型的方法,并在此基础上自适应地进行计算网格的划分,将该方法应用于CAE系统的前处理过程,对于形状复杂的构件具有较好的适用性。 相似文献
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一、总体介绍 ANSA是世界领先的、功能强大的CAE应用软件包,由希腊BETA公司开发,目前在世界上的应用非常广泛.ANSA具有强大的有限元网格前处理功能,支持结构和流体网格.一般来说,CAE分析工程师将80%以上的时间用于建立和修改有限元模型,因此采用一个功能强大、方便灵活的有限元前、后处理工具,对于提高有限元分析的质量和效率具有十分重要的意义. 相似文献
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The aim of the method proposed here is to show the possibility of generating adaptive surface meshes suitable for the finite element method, directly from an approximated boundary representation of an object created with CAD software. First, we describe the boundary representation, which is composed of a simple triangulation of the surface of the object. Then we will show how to obtain a conforming size-adapted mesh. The size adaptation is made considering geometrical approximation and with respect to an isotropic size map provided by an error estimator. The mesh can be used “as is” for a finite element computation (with shell elements), or can be used as a surface mesh to initiate a volume meshing algorithm (Delaunay or advancing front). The principle used to generate the mesh is based on the Delaunay method, which is associated with refinement algorithms, and smoothing. Finally, we will show that not using the parametric representation of the geometrical model allows us to override some of the limitations of conventional meshing software that is based on an exact representation of the geometry. 相似文献
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复杂曲面混合网格的生成算法 总被引:3,自引:0,他引:3
有限元网格质量的好坏对金属成形模拟的精度和效率有很大影响。提出了一种复杂曲面混合网格自动生成算法,该算法根据所要划分的网格密度形成初始化边界节点,逐步向内铺砌混合网格,直至布满整个区域。应用实践表明.该算法具有稳定、准确和速度快的特点,生成的网格在相邻曲面边界处不会产生裂缝与覆盖,很好地满足了金属成形模拟分析软件对网格划分的要求。 相似文献
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网格模型的局部编辑算法 总被引:2,自引:3,他引:2
提出一种新的网格模型局部编辑算法,该算法可以精确地控制变形区域的大小、边界和变形点的位移,克服了FFD及其改进算法的缺点.首先交互地定义一个附着在模型表面的控制网格;然后建立模型变形区域与控制网格间点的映射,再依据变形要求来编辑控制网格;最后根据映射关系反算出模型变形区域点的新位置.控制网格可以是参数曲面的控制网格,也可采用一般三角网格或预先定义的网格模板.为达到精确变形的目的,对模型与控制网格重叠的区域进行自适应细分.该算法计算简便、易于实现,并能达到很好的效果. 相似文献
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Contour line type representation is useful for understanding the surface structure qualitatively to a human. However, for the computer handling, a contour line model may not be suitable and it is required to be converted to the other type model such as a mesh surface model. It may be a problem how to decide mesh data on a mesh line where there are fewer points intersecting with contour lines. In this article, the authors propose a new method to convert a contour line model to a mesh surface model with minimum errors. Mesh lines (equivalent to the planes intersected with contour surface) located on the contour surface and intersected with contour lines are calculated. A mesh line which has maximum number of effective sampling points (that means maximum number of intersections with contour lines, and hereafter referred to as latter) is selected and a sectional shape along this mesh line is decided. The sectional shape is represented by spline curve with parameters, so that the mesh point data on the mesh line can be determined easily, and these decided mesh points are regarded as equivalent as intersection with contour lines. The above processes are repeated until all mesh lines which have intersection points or obtained mesh data have been chosen and calculated. Thus we can convert a contour model to a mesh surface model with minimum loss of contour line informations. 相似文献
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Quasi-automatic 3D finite element model generation for individual single-rooted teeth and periodontal ligament 总被引:4,自引:0,他引:4
Clement R Schneider J Brambs HJ Wunderlich A Geiger M Sander FG 《Computer methods and programs in biomedicine》2004,73(2):135-144
The paper demonstrates how to generate an individual 3D volume model of a human single-rooted tooth using an automatic workflow. It can be implemented into finite element simulation. In several computational steps, computed tomography data of patients are used to obtain the global coordinates of the tooth's surface. First, the large number of geometric data is processed with several self-developed algorithms for a significant reduction. The most important task is to keep geometrical information of the real tooth. The second main part includes the creation of the volume model for tooth and periodontal ligament (PDL). This is realized with a continuous free form surface of the tooth based on the remaining points. Generating such irregular objects for numerical use in biomechanical research normally requires enormous manual effort and time. The finite element mesh of the tooth, consisting of hexahedral elements, is composed of different materials: dentin, PDL and surrounding alveolar bone. It is capable of simulating tooth movement in a finite element analysis and may give valuable information for a clinical approach without the restrictions of tetrahedral elements. The mesh generator of FE software ANSYS executed the mesh process for hexahedral elements successfully. 相似文献
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各类网格分割法将曲面网格进行分割后,各子网格区域之间的交界线便可以作为曲面网格的封闭特征线。相反,如果根据网格模型的几何、拓扑特征,确定了网格模型的封闭特征线后,网格曲面便被这些特征线分割开来。为此,从曲面网格封闭特征线的角度出发,提出一种基于特征线的曲面网格分割方法。实验验证了该方法的可行性和有效性。 相似文献
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R. Taghavi 《Engineering with Computers》1996,12(3-4):178-185
HEXAR, a new software product developed at Cray Research, Inc., automatically generates good quality meshes directly from surface data produced by computeraided design (CAD) packages. The HEXAR automatic mesh generator is based on a proprietary and parallel algorithm that relies on pattern recognition, local mesh refinement and coarsening, and variational mesh smoothing techniques to create all-hexahedral volume meshes. HEXAR generates grids two to three orders of magnitude faster than current manual approaches. Although approximate by design, the resulting meshes have qualities acceptable by many commercial structural and CFD (computational fluid dynamics) software. HEXAR turns mesh generation into an automatic process for most commercial engineering applications. 相似文献