排序方式: 共有90条查询结果,搜索用时 0 毫秒
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结构动力分析隐式积分并行算法与实现 总被引:2,自引:0,他引:2
在分布式并行计算机环境下进行了有限元并行算法的研究,建立了结构动力分析的两种隐式积分方法(Newmark方法和Wilson-θ方法)的并行化方法与算法步骤,设计了变带宽一维存储时有效刚度矩阵的三角分解并行算法;基于Transputer的分布式MIMD并行计算机上,采用3L并行FORTRAN编写了计算程序,并将其移植到有限元串并行混合分析软件PFEM中。以平面问题和空间板弯问题作为实例进行了数值计算。结果表明计算方法具有较高的并行效率。当自由度为7579,最大带宽为726时,2个和3个处理器工作的并行效率分别为0.70和0.55。 相似文献
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Using a sub-regional boundary element method, an algorithm for the two-dimensional elastic bodies with a closed crack loaded
by a moving contact elastic body is proposed. Since the extent and status of the contact surface of two elastic bodies and
the crack within the body are all not known in advance, a double iterative contact algorithm is used. The BEM program for
solving the closed crack problems is developed, some numerical examples are calculated, and the results of the center crack
cases are shown to be in good agreement with the analytical solution in the classical fracture mechanics. In the condition
of friction and non-friction, some coupling computational results of the SIF for the closed crack, with different angles and
loaded by a moving contact elastic body, are also obtained by a numerical computation.
The project supported by the National Natural Science Foundation of China (10172053) and NJTU Foundation of China (PD-157) 相似文献
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双材料界面裂纹小范围屈服边界元分析 总被引:2,自引:0,他引:2
为适于界面断裂问题的分析,完善并发展了基于小变形弹塑性理论的弹塑性边界元子域法。根据双材料界面裂纹小范围屈服分析的一般性结论,对双材料界面裂纹小范围屈服问题作了计算。针对断裂理论的边界层模型,计算了小范围屈服场的全场解。结果表明,对界面裂纹小范围屈服分析,能够发挥边界元法的优势,利用较少的单元数即可深入到塑性区内部较深范围,以得到裂尖附近的应力场以及比较准确的塑性区形状和尺寸。 相似文献
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薄壳动力分析的三维半显式迭代算法 总被引:1,自引:0,他引:1
利用三维变分差分方法研究薄壳的动力分析。针对显式迭代格式最大稳定时间步长过小,而隐式迭代格式计算量大且精度不足这一问题,构造了一种半显式迭代格式(即关于厚度方向隐式、而关于其余两个方向显式),它的最大稳定时间步长较显式迭代格式有很大的提高,而计算量并未显著增加。算例的数值结果表明,这种半显式迭代格式具有较高的精度,它的时间步长满足计算薄壳波动问题的要求。 相似文献
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1会议概况首次MIT国际计算流体力学与计算固体力学学术会议于2001年6月12日~6月15日在美国麻省理工学院召开.会议由美国麻省理工学院机械系的K. J. Bathe教授担任主席,是以一个学校的名义主办的计算力学领域高水平的国际学术会议.会议的宗旨是:把工业界和学术界集合到一起,并培育计算力学的一代新人.投稿经过比较严格的筛选,共录用收入论文集的论文446篇,其中大会报告8篇,固体与结构153篇,流体72篇,多物理场102篇,自然对流问题的计算流体力学16篇,优化与设计48篇,独立于物理应用的… 相似文献
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Fast Multipole BEM for 3-D Elastostatic Problems with Applications for Thin Structures 总被引:6,自引:0,他引:6
The fast multipole method (FMM) has been used to reduce the computing operations and memory requirements in large numerical analysis problems. In this paper, the FMM based on Taylor expansions is combined with the boundary element method (BEM) for three-dimensional elastostatic problems to solve thin plate and shell structures. The fast multipole boundary element method (FM-BEM)requires O(N) operations and memory for problems with N unknowns. The numerical results indicate that for the analysis of thin structures, the FM-BEM is much more efficient than the conventional BEM and the accuracy achieved is sufficient for engineering applications. 相似文献
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AMODELIDENTIFICATIONMETHODOFVIBRATINGSTRUCTURESFROMINCOMPLETEMODALINFORMATIONZhengXiaoping(郑小平)YaoZhenhan(姚振汉)QuShisheng(蘧时胜)... 相似文献