摘要
为了使 DDA( discontinuous deformation analysis)方法更加有效地满足实际工程的需要 ,对原方法作了改进 .开发了界面友好的前、后处理程序 ,方便用户建立 DDA模型和有效地进行计算结果分析 ;修正了由于刚体旋转给计算结果带来的误差 ;在 DDAW程序中集成了圆形和椭圆形颗粒随机生成算法 ,并对椭圆形颗粒的接触算法进行了改进 ,从而使 DDA可以应用于分析散粒体介质 ;增加了更加有效的方程求解器——预处理共轭梯度法 ( PCG)和对称连续超松弛预处理共轭梯度法 .将这些改进集成在新开发的 DDAW( discontinuousdeformation analysis-windows version)程序中 .算例证明了 DDAW程序的正确性和有效性 .
In order to make DDA meet the requirements from practical applications, the following improvements on the method are made: 1) Developing a user friendly pre processor for easily making DDA models and a post processor for efficiently analyzing the results from DDA calculation; 2) Modifying DDA codes for reducing block rigid rotation error; 3) In order to simulate granular medium using DDA, the arithmetic of creating circular and elliptic particles bounded by boundaries is included in DDAW, and the method of detecting contacts is also improved; 4) More efficient equation solvers, the preconditioned conjugate gradient method (PCG) and the symmetrical successive over relaxation preconditioned conjugate gradient method (SSOR PCG), are implemented in DDAW.
出处
《大连理工大学学报》
CAS
CSCD
北大核心
2001年第5期602-606,共5页
Journal of Dalian University of Technology
基金
国家教育部跨世纪人才基金资助项目 (教技厅 [1997] 2 )
