离散元计算的位移控制方法

基于离散单元的动态松弛法，提出了由每循环步允许块体最大位移增量控制每步块体求解的方法--位移控制法。该方法通过对块体的位移试算来决定时步的大小，不仅解决了离散元计算中的如叠合过大等问题，还可以提高计算的精度和效率。编制了相应的程序和程序流程图，并给出了算例分析。

Control displacement solution for discrete element method analysis

Based on dynamic relaxation of discrete element method(DEM),a control displacement solution for displacement integral is proposed to solve the problem caused by unreasonable time-step interval impacting on the stability of the result.The time-step interval is determined by pre-calculating the displacements of the discrete blocks.The proposed solution not only solves the problem of excessive overlap between blocks,but also improves the precision of displacement integral and calculating efficiency.The relevant program is developed with its flow chart,and a typical example is given in this paper.