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51.
As a first step to developing mathematical support for finite element approximation to the large eddies in fluid motion we
consider herein the Stokes problem. We show that the local average of the usual approximate flow field u
h
over radius δ provides a very accurate approximation to the flow structures of O(δ) or greater. The extra accuracy appears for quadratic or higher velocity elements and degrades to the usual finite element
accuracy as the averaging radius δ→h (the local meshwidth). We give both a priori and a posteriori error estimates incorporating this effect.
Received December 3, 1999; revised October 16, 2000 相似文献
52.
53.
54.
IMT-Advanced频率相关问题研究进展 总被引:1,自引:0,他引:1
介绍了ITU关于IMT-2000以及IMT-Advanced系统未来发展的频率需求、候选频段等问题的研究情况及进展。 相似文献
55.
We present an algorithm for computing the convex hull of freeform rational surfaces. The convex hull problem is reformulated as one of finding the zero-sets of polynomial equations; using these zero-sets we characterize developable surface patches and planar patches that belong to the boundary of the convex hull. 相似文献
56.
Filleting and rounding operations are very useful in solid modeling. The most popular means of producing a fillet surface
is by means of the so-called ``rolling ball blend.' A new method, inspired by the rolling ball blend, which overcomes both
of its serious drawbacks is presented in this paper. 相似文献
57.
In this paper two curvature adaptive methods of surface triangulation are presented. Both methods are based on edge refinement to obtain a triangulation compatible with the curvature requirements. The first method applies an incremental and constrained Delaunay triangulation and uses curvature bounds to determine if an edge of the triangulation is admissible. The second method uses this function also in the edge refinement process, i.e. in the computation of the location of a refining point, and in the re-triangulation needed after the insertion of this refining point. Results are presented, comparing both approaches. 相似文献
58.
Length Preserving Multiresolution Editing of Curves 总被引:1,自引:0,他引:1
In this paper a method for multiresolution deformation of planar piecewise linear curves that preserves the curve length is presented. In a wavelet based multiresolution editing framework, the curve can be deformed at any level of resolution through its control points. Enforcing the length constraint is carried out in two steps. In a first step the multiresolution decomposition of the curve is used in order to approximate the initial curve length. In a second step the length constraint is satisfied exactly by iteratively smoothing the deformed curve. Wrinkle generation is an application the paper particularly focuses on. It is shown how the multiresolution definition of the curve allows to explicitly and intuitively control the scale of the generated wrinkles. 相似文献
59.
摘要:对150mm超厚07MnCrMoVR水电钢的组织性能进行了研究,采用光学显微镜、扫描电子显微镜对试验钢的微观形貌进行了观察,采用拉伸试验机和低温冲击韧性试验机对试验钢力学性能进行了检验。结果表明:试验钢经第一次完全淬火和第二次两相区亚温临界淬火后近表面组织转变为板条马氏体和未熔铁素体相间出现,厚度1/4处和厚度1/2处组织转变为贝氏体+铁素体组织,高温回火后近表面转变为回火索氏体组织,厚度1/4处和厚度1/2处组织转变为回火贝氏体+铁素体+大量碳化物。 相似文献
60.
介绍了定期检验中发现的1000m3氧气球罐裂纹情况,分析认为球壳板母材边缘存在缺陷、焊后热影响区材料性能的退化与各种应力的存在是导致具有再热裂纹倾向的07MnCrMoVR制球罐产生裂纹的主要原因。技术要求不完善使裂纹在制造安装阶段未能得到消除。提出为保证07MnCrMoVR制球罐的安全质量应加强对球壳板边缘母材质量的检... 相似文献