A DEM parameters calibration method for three-dimensional model of the lunar rock based on the approximate model

Abstract

The development of an accurate rock discrete element model is essential for modeling core drilling in the lunar environment. However, most of the microscopic parameters of the discrete element model cannot be determined directly by tests. Consequently, a rapid calibration method for microscopic parameters was developed, combining an approximation model, multiple objectives with particle swarm optimization algorithm (MOPSO), and orthogonal experimental design (OED). Range analysis and variance analysis were conducted to investigate the sensitivity of these parameters. Through this approach, the optimal solution for microscopic parameters was obtained to align with the mechanical characteristics of lunar rock simulant, providing a foundation for rock core drilling. The results demonstrate a high level of agreement between the simulated stress-strain curves and the test results. The deviation between the mechanical strength parameters and actual test values was found to be less than 5%, confirming the effectiveness and rationality of the proposed parameter calibration method. This method holds significant potential for widespread application in calibrating the parameters of discrete element models for rock materials.