基于工作站机群的有限元结构分析并行计算

并行计算正成为科学和工程计算中的一个新趋势。将采用区域分裂技术的并行有限元方法应用于工作站机群的分布式并行环境。提出了基于单元区域分裂的共轭梯度并行算法。在工作站机群上对坝体结构进行求解,对其并行性能进行分析。     

Finite element analysis

Current use of the finite element method in engineering practice is considered. The increasing use of finite element analysis in a CAD environment and factors influencing it are discussed.The technological state of the art is briefly reviewed. Special consideration is given to shell elements and solution methods, illustrating the progress being made in these and other areas of finite element technology. Future trends are predicted.     

某发动机曲轴箱有限元分析

基于有限元分析和应力疲劳理论,通过Abaqus和FEMFAT软件,对某发动机缸体曲轴箱进行结构强度分析,得到其应力分布、接触情况和高周疲劳安全因数分布.结果表明此曲轴箱结构满足设计要求.     

预应力渡槽有限元分析

针对预应力混凝土能极大提高混凝土结构抗拉抗裂强度的特点,结合等效载荷自平衡原理,以南水北调工程中大型预应力混凝土渡槽为模型,采用三维有限元技术分析其受力性能,揭示预应力渡槽在施工、校核等不同工况下的应力和应变等特性.计算结果表明,整个渡槽结构应力、变形满足设计要求,可为施工设计提供参考.     

Evaluation of distributed finite element algorithms on a workstation network

This paper discusses the design, implementation and evaluation of linear finite element programs that distribute their computations over a network of workstations. We consider five different algorithms based on direct, iterative and hybrid equation solvers, each of which partitions and maps the model domain across conventional network hardware. A software architecture based on the client-server model distributes the computations and, at the language level, Berkeley sockets enable communication between processes. We evaluate and describe the performance of these algorithms in terms of execution time and speed-up, and we conclude that distributed solvers, particularly those based on substructuring and static condensation, can be effective even on high-latency communication networks.     

Finite element analysis using a single user computer

A two dimensional finite element program has been translated from Pascal to Fortran to run on an ICL PERQ single user computer under the PNX operating system. Many improvements and extensions have been incorporated, including automatic meshing algorithms. Extensive use is made of the PERQ's excellent interactive graphics capabilities to set up models, boundary conditions, etc and to post-process the results.     

汽车车门过开启有限元分析

用Abaqus中的静力学分析功能,对某款车型前门进行过开启分析,得到此车门的过开角度和卸载后车门的残余角度以及车门和限位器的受力状况.同时,利用Abaqus中的MODEL CHANGE关键词,实现车门在过开启后,只有车门重新关闭而限位器保持不动的模拟,以此来考察车门能否关闭,从而更进一步评估传统的车门过开启分析方法.仿真结果表明:该车门过开性能满足设计目标,无破坏风险,且MODEL CHANGE关键词可以为模拟车门的关闭提供极大方便.     

发电机挡块组件有限元分析

为分析抽水蓄能发电机挡块组件的von Mises应力（以下简称应力）分布情况,在MSC Marc中建立有限元模型,分别采用截面法和渗透接触法对螺栓施加预紧力,通过对发电机挡块组件处于稳定转速、抽水启动、抽水停机、发电启动、发电停机和甩负荷等工况的非线性接触分析,得到各工况下该发电机挡块组件的应力分布.结果表明,2种螺栓预紧力的施加方法是等效的;各工况下最大应力均发生在螺栓圆角处;转速大小对应力分布起决定性作用.该结果可为抽水蓄能发电机挡块组件结构的分析设计提供参考.     

基于Abaqus的足部有限元分析

通过Engauge软件从CT图像上提取出成年男子足部轮廓数据,根据得到的数据运用SolidWorks建立足部模型,然后利用Abaqus进行应力分析.分析人体站立及承受碾压力时足部受力情况,结果表明:该成年男子站立时最大应力及变形均在跖骨,应力为0.919 MPa,变形为1.19mm;足部承受100 N碾压力时,跖骨的最大应力为2.635 MPa,碾压力为1 000 N时,跖骨的最大应力已达到23.572 MPa.人体足部受到碾压时,跖骨极易出现损伤.     

Finite element analysis of 3-D beam-columns on a nonlinear foundation

A numerically integrated finite element for the analysis of three-dimensional, nonlinear Winkler foundations is developed. Together with a linear beam-column element they are used to solve problems of beams, columns and beam-columns on linear and nonlinear foundations in two and three dimensions. The Newton-Raphson method is used in the solution. Excellent results are illustrated by comparisons with available solutions.     

地铁空调机箱有限元分析

为验证某型号地铁空调机箱产品设计是否符合强度要求,建立机箱有限元模型,依据GB／T21563-2008和EN12663-2000对该空调机箱分别进行冲击性能分析、模态分析、随机振动分析和疲劳性能分析等,获得空调机箱在各种工况下的云图．分析结果表明机箱的设计符合强度要求．     

汽车钣金结构有限元分析的精度

通过非线性CAE分析软件Abaqus实现钣金结构的冲压和回弹过程,并将冲压结果映射到舱盖总成结构.考虑料厚减薄和残余应力对舱盖振动特性的影响,为提高分析精度提供参考.     

平板式轧制力传感器的有限元分析

利用有限元分析软件ANSYS Workbench对平板式轧制力传感器的弹性体进行了分析,解决了弹性体深孔的贴片深度问题,并且研究了弹性体内部结构尺寸变化对贴片区输出应变的影响,为优化设计提供了依据,加快了产品研发的进度。     

Finite element analysis on the BBN butterfly multiprocessor

Applications of the finite element method can easily exhaust CPU and memory resources on conventional uniprocessor machines, and are thus prime candidates for multiprocessor application. In order to investigate various parallel processing methodologies and to evaluate their performance, we have developed a finite element program for the Butterfly Parallel Processor. The overall organization of the program and its data structures are described along with parallel implementations of well-known algorithms for transient and static analysis. Results are presented for two implementations of explicit time integration, and for static analysis using a parallel version of Gaussian elimination. For comparison, results from running the same program on a DEC VAX 11/785 are also included. The transient cases yielded near-linear (within 2.5%) speedup in the full range of 1–64 processors; the static case results showed significant nonlinearity over the same range.     

某磁浮飞轮转子系统有限元分析

为更好地分析计算磁浮飞轮转子系统的动力学特性,对其进行有限元仿真.基于已有的磁浮轴承控制律,根据相关参数计算出转子系统平衡位置处的线性化位移刚度,建立弹性支撑的磁浮飞轮转子有限元模型,用ANSYS对转子进行模态分析,研究支撑刚度和离心应力对转子系统模态和频率的影响.结果可为磁浮飞轮的信号测试和模态控制提供参考.     

某螺旋簧结构驱动桥有限元分析

用有限元法计算分析螺旋簧结构驱动桥在多工况下的结构应力,找出结构薄弱环节并加以改进.     

校车车身结构的有限元分析

建立某型校车的有限元模型,计算在不同工况下其车身骨架的静态强度.计算结果表明:在弯曲和扭转工况下,该校车最大应力分别为154.8和171.4 MPa,均小于Q235屈服应力235 MPa;最大变形分别为4.925和12.92 mm,满足《客车定型试验规程(GB/T 13043—2006)》中所规定的弯曲和扭转工况下10及12 mm的限额;车身结构整体应力大多集中在30 MPa左右,有较大的安全裕度.分析结果可为该校车车身骨架结构优化提供参考.     

基于Abaqus的叠层器件有限元分析

针对叠层结构的热应力和散热问题,用Abaqus建立叠层结构热应力和流体动力学分析模型.热应力分析结果表明在芯片与板两种材料结合部位的应力较大;流体动力学分析结果表明在叠层间空气的流动比外表面小.