离散单元法的计算参数和求解方法选择

Determination of calculating parameters and solution methods of discrete element method

本文对离散单元法的一些基本问题进行了研究，给出了刚度计算公式，提出了两种新的用于求解静态问题的自适应阻尼，并以自由落体运动为例，探讨了中心差分法、Ｗｉｌｓｏｎθ法和Ｎｅｗｍａｒｋ法对离散单元法解的影响。

The fundamental problems of discrete element method are studied in this paper. The stiffness formulae and two types of adaptive damping are presented. The movement history of a freely falling body is simulated using discrete element method to analyze the influence of the central difference, Wilson θ and Newmark methods upon the solutions.