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网格畸变
相关语句
  mesh distortion
     The MPM eliminates difficulty with mesh distortion as in the Lagrangian method,and with interface tracking and nonlinear convection term as in Eulerian scheme.
     该方法避免了拉格朗日格式因网格畸变产生的数值困难,也克服了欧拉格式材料界面跟踪问题以及因非线性对流扩散项而引起的数值困难。
短句来源
     Numerical experiments show that this hybrid element, ECAQ4, is of high coarse-mesh accuracy, insentive to mesh distortion, and poisson-locking free.
     数值试验表明该元粗网格精度高,对网格畸变不敏感,可有效克服poisson locking。
短句来源
     Remeshing technique is introduced to decrease the error due to mesh distortion.
     在软件中应用网格重新划分技术降低由于网格畸变引起的计算误差。
短句来源
     Mesh Distortion Insensitive Arbitrary Quadrilateral Plane Element
     对网格畸变不敏感的任意四边形平面单元
短句来源
     A definition named as Sensitive Factor(Sf) about the element to mesh distortion has been given to facilitate the compare between different elements.
     为便于对不同单元进行比较 ,定义了单元对网格畸变反应的敏感因子
短句来源
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  “网格畸变”译为未确定词的双语例句
     Numerical examples show that two of the proposed elements, ATF-Q4a and ATF-Q4q, are free from mesh sensitivity and exhibit excellent performance.
     数值算例表明,其中两个单元ATF-Q4a和ATF-Q4q对网格畸变不敏感,显示出良好的性能。
短句来源
     Meshless methods are developed based on the finite element method, which establish trial function independent of elements, thus they have some advantages to solve nonlinear mechanical and crack propagation problems, because of effectively abstaining from complex meshing and disadvantageous influence of elements distorting.
     无网格方法是在有限元法的基础上提出来的,他与有限元法的主要区别在于建立近似函数时不需要网格,而是基于彼此独立的节点建立离散方程,有效的避免了复杂的网格划分和网格畸变等不利影响,在处理非线性力学和动态裂纹扩展等问题中有明显的优势。
短句来源
     MARC\Superform to simulate seamless steel tube continuous rolling process,it is difficult to measure the tube wall-thickness in post processing because of serious distortion of FE mesh.
     MARC\Superform模拟连轧管的轧制过程时,由于毛管延伸系数大,有限元网格畸变严重,使得在后处理中荒管壁厚测量比较困难。
短句来源
     So, unlike the Lagrangian formulation, ALE finite element can't cause the entanglement and degeneration of the mesh, and can describe accurately the free surface of the material during the processes, which is impossible in the Eulerian FEM.
     因此 ,ALE有限元避免了La grangian有限元中的网格畸变 ,又克服了Eulerian有限元中难以描述自由边界的不足。
短句来源
     Comparing with conventional numerical methods, the advantage of Meshless methods lies in its approximation based on nodes. The main feature of the methods is that mesh can be eliminated wholly or partly, and reducing difficulty in mesh generation of the structure, and not like the traditional method in which mesh generation can be a very time-consuming and expensive task.
     和传统的数值计算方法相比,无网格方法的优点在于它使用基于节点的近似,该方法可以彻底或部分地消除网格,摆脱或至少减轻对整个结构划分网格的困难,克服了传统数值解对网格的依赖性以及网格生成、网格畸变和网格移动引起的问题,因而受到众多计算力学和计算数学工作者的重视,并得到了迅速地发展,涌现出各种不同的无网格方法。
短句来源
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  相似匹配句对
     Talk about great global grid
     网格漫谈
短句来源
     The Mesh Point Battle
     网格点阵
短句来源
     Mesh Distortion Insensitive Arbitrary Quadrilateral Plane Element
     对网格畸变不敏感的任意四边形平面单元
短句来源
     Element Free Galerkin Method for Elasto-Plastic Problems With Large Deformation Distortion
     弹塑性大变形畸变问题的无网格分析
短句来源
     The Drawing of Distortion Contour Maps
     畸变图谱的绘制
短句来源
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  mesh distortion
Standard finite element approaches are still ineffective in handling extreme material deformation, such as cases of large deformations and moving discontinuities due to severe mesh distortion.
      
A method for controlling mesh distortion during the shape optimization process is given based on an explicit limit on the design change to prevent the Jacobian from vanishing.
      
It is shown that the mesh distortion that exists in the finite element-based design approach is effectively resolved for large shape changing design problems through 2-D and 3-D numerical examples.
      
On the other hand, the Eulerian formulation, with its fixed coordinate system, does not suffer from mesh distortion.
      
This is because the former does not only possess the same accuracy as the latter when regular meshes are employed for analysis, but is also very insensitive to mesh distortion, for which the Q8 element can not handle.
      
更多          
  grid distortion
The strategy uses as input the grid distortion data, which provides the magnitudes of macroscopic particle velocities at discrete (nodal) points.
      
First, a plane channel flow at Reτ = 395 was simulated using both Cartesian and curvilinear grids; the results show that the model formulation is consistent and insensitive to grid distortion, and compares well with the reference data.
      
The association between Snellen visual acuity, Amsler grid distortion and presence of diabetic retinopathy with self-reported functioning and well-being (SF-36) were examined in a sample of 327 diabetics from the Medical Outcomes Study (MOS).
      
There was little or no correlation between Snellen visual acuity, Amsler grid distortion or diabetic retinopathy and functioning and well-being (i.e.
      
Maximum product-moment correlation was 0.15 with worst eye visual aculty, 0.13 with best eye visual acuity, 0.08 with presence of retinopathy, and 0.10 with Amsler grid distortion.
      
更多          


In this paper a comparison between superplasticity and non-superplasticity o the matreial Zn-22% Al has been made through the alloy deformations in the process of extrusion and in that of upsetting, their hardness distribution and lattice variation measured practically, and their microstructure in the deformation area analyzed. The results show that the superplastic characteristics of the alloy deformation are different obviously from the non-superplastic characteristics owing to the effects of sensitivity strengthening...

In this paper a comparison between superplasticity and non-superplasticity o the matreial Zn-22% Al has been made through the alloy deformations in the process of extrusion and in that of upsetting, their hardness distribution and lattice variation measured practically, and their microstructure in the deformation area analyzed. The results show that the superplastic characteristics of the alloy deformation are different obviously from the non-superplastic characteristics owing to the effects of sensitivity strengthening of the superplastic strain rate and thef boundary viscous friction in the alloy. It was observed that the superplastic deformation area in the alloy was distinct when it was extruded and invertedly extruded, but the microstructure of different parts remained unvaried. The alloy wsa deformed either by extrusion or by upsetting, the superplastic hardness would be higher than the non-superpla tic hardness due to the effect of strengthening of the superplastic fine grain dispersion. And the curvature radius of the barrelling in superplastic deformation of the alloy by upsetting was larger than that in nonsupcrplastic deformation of the alloy by upsetting.

本文对Zn-22%Al材料超塑性状态与非超塑状态进行了挤压及镦粗变形对比,实测了硬度分布及网格变化,对变形区组织也进行了分析。结果表明,由于超塑性状态的应变速率强化敏感及边界粘性摩擦的影响使其变形的特点与非超塑性状态有着明显的区别。对于超塑性状态的正挤压与反挤压变形可观察到其变形区较深,网格畸变剧烈,但是显微组织在各部位变化不大。由于超塑性细晶粒弥散强化的影响,无论是挤压变形还是镦粗变形,超塑性状态的硬度比非超塑性状态的略高。对于镦粗变形,超塑性状态的鼓形肚曲率半径较非超塑性的大。

An integrated system FSOP2D,including modules for the shape optimal modeling,structural analysis,sensitivity analysis,optimal method library and post- processing,is developed.By selecting fictitious loads as the design variables that has a linear relationship with the grid point locations and using design sensitivity analysis of the domain method,it is easier to solve the velocity field.In the course of optimal iterations,mesh distortion is kept to a minimum,sensitivity derivatives of object function,stress...

An integrated system FSOP2D,including modules for the shape optimal modeling,structural analysis,sensitivity analysis,optimal method library and post- processing,is developed.By selecting fictitious loads as the design variables that has a linear relationship with the grid point locations and using design sensitivity analysis of the domain method,it is easier to solve the velocity field.In the course of optimal iterations,mesh distortion is kept to a minimum,sensitivity derivatives of object function,stress constraints and displacement constraints are derived.Computation of sensitivity analysis is achieved in the system.Two engineering examples are used to prove the system's effectiveness,the optimal results can successfully be obtained by lesser number of iterations.

研制了包括二维形状优化建模、结构分析、敏度分析、优化方法库、后处理等功能的集成软件系统 FSOP2D.选择以虚拟载荷为设计变量,使得网格节点坐标与设计变量之间建立了线性关系,并使用区域方法的敏度分析,从而使得速度场求解容易.在优化迭代的过程中,可使网格畸变保持最小.推导了目标函数、应力和位移约束的敏度导数.在系统中实现了敏度分析计算,所编的软件对两个工程实例进行验算,经少量迭代就优化成功.

In numerical analysis many finite element models have acceptable performance when the computing meshes are regular. However, as the level of mesh distortion increases, their accuracy of solutions descends rapidly. Therefore, how to formulate an element that is less sensitive to geometric distortion was an important question for study for a long period. In this paper, a simple quadrilateral membrane element with rotational degrees-of-freedom is developed with the approach of the generalized conforming element...

In numerical analysis many finite element models have acceptable performance when the computing meshes are regular. However, as the level of mesh distortion increases, their accuracy of solutions descends rapidly. Therefore, how to formulate an element that is less sensitive to geometric distortion was an important question for study for a long period. In this paper, a simple quadrilateral membrane element with rotational degrees-of-freedom is developed with the approach of the generalized conforming element proposed earlier by one of the author of this paper. The new element exhibits an excellent feature, that is, much less sensitive to geometric distortion. Also a general method to formulate high precision finite element that is less sensitive to geometric distortion is provided in this paper.

许多有限元模型在规则网格下具有很高的精度,但当网格畸变程度增大时,其计算精度也随之迅速下降.如何构造出对网格畸变不敏感的单元,长期以来是人们十分关注的课题.本文应用作者早期提出的广义协调方法,构造出具有平面内旋转自由度的任意四边形膜元.该单元不仅列式简洁,而且具有对网格畸变极不敏感的优异性能,为构造对网格畸变不敏感的优质单元提供了一个通用方法

 
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