Application of Distinct Element Method to analyze machine-soil interaction

应用离散单元法，这是一种很有前途的方法来分析颗粒材料组合体的行为，进行了以下试验模拟机器和土壤之间的相互作用。结果表明，只要找到合适的参数，离散元法就能实现机械零件的合理设计。三轴压缩，2.履带板和土壤，3.轮胎凸耳和土壤，4.旋转刀片和土壤，5.深松机和土壤。并根据真实的世界维数构造了三维DEM程序。在三维DEM的情况下，计算时间大大增加的问题需要以后解决。最后的报告是用英文写的，内容如下：第一章。第2章，我的朋友第三章离散元法概述。第四章，用离散元法模拟钢筋贯入时的土体变形和阻力。第五章，三轴压缩下土体变形与应力变化之离散元模拟。利用离散元模拟履带板与土壤相互作用，第6章。应用离散元法模拟土壤与轮胎凸耳之相互作用，第七章。应用离散元法模拟土壤与旋耕刀相互作用，第八章。应用离散元法模拟土壤与深松铲柄之间的相互作用，第9章。3-三维离散元法模拟土壤和轮胎凸耳之间的相互作用，第10章。结论

Applying the Distinct Element Method, which is one of promising methods to analyze behaviors of granular material assembly, the following trials were done to simulate the interactions between machine and soil. It was shown that the rational design of machine part would be realyzed using the DEM, if the adequate parameters were found. The interactions were : 1. tri-axial compression, 2. track shoe and soil, 3. tire lug and soil, 4. rotary blade and soil, 5. subsoiler and soil. Furthermore, three-dimensional DEM program was constructed according to the real world dimension. The problem that the computation time increases very much in the case of three-dimensional DEM should be solved hereafter.The final report was written in English with the following contents :Chapter 1. Introduction, Chapter 2. Outline of Distinct Element Method, Chapter 3. Simulation of soil deformation and resistance at bar penetration by DEM, Chapter 4. Simulation of soil deformation and stress variation at 3-axial compression by DEM, Chapter 5. Simulation of track shoe-soil interaction by DEM, Chapter 6. Application of DEM to simulate interaction between soil and tire lug, Chapter 7. Application of DEM to simulate interaction between soil and rotary blade, Chapter 8. Application of DEM to simulate interaction between soil and subsoiler shank, Chapter 9. 3-dimensional DEM for simulation of interaction between soil and tire lug, Chapter 10. Conclusion.