Application Research of Numerical Simulation of Pressure Characteristics of Lunar Soil
Based on analyzing the Finite Element Method (FEM) and Discrete Element Method (DEM), this research considers that the DEM is feasible and superior to the FEM in simulating the interaction of lunar rover with lunar soil. A plate and simulant soil were used in this simulation process. According to the lunar soils physical and mechanical properties,the pressure-sinkage characteristics of lunar soil are simulated by means of a DEM software called PFC2D. In this research,the DEM contacting mechanics model of lunar soil was built by the biax test, and the angle of internal friction is 27.5°, the cohesion is 461.9pa, the Poissons ratio is 0.151, and the Youngs modulus is 1388.Bkpa. To study the interaction between lunar rover and terrain, the plate-sinkage-test was simulated by the PFC2D and the relationship of pressure-sinkage of simulant lunar soil was studied. The results show that the experimental values conform with the DEM simulant test results.In addition, the effect of bulk density and plate speed on pressure-sinkage characteristics is analyzed. Finally, the parameters of terra-mechanics were calculated by least square method, where kc is 14.7kN/mn+1,Kφ is 245.2kN/mn+2,n is 1.23.
discrete element method (DEM) numerical simulation lunar soil pressure characteristics
Chen Bin Li Jianqiao Li Yinwu Zou Meng
Key Laboratory of Terrain-machine Bionics Engineering,Ministry of Education,Jilin University,Changchun 130022,China
国际会议
北京
英文
381-388
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）