Chinese Space Science and Technology ›› 2023, Vol. 43 ›› Issue (2): 63-72.doi: 10.16708/j.cnki.1000-758X.2023.0021

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Mechanical model for lunar surface sampling based on modular theory

LYU Jiahang,LI Qian,HU Dingkun,LUO Haotian,ZOU Xinyue   

  1. College of Environment and Civil Engineering,Chengdu University of Technology,Chengdu 610059,China
  • Online:2023-04-25 Published:2023-03-13

Abstract:  Not limited by the working space,there are various designs of lunar surface sampling devices,which brings great difficulty to establishing analysis model.In order to avoid duplicate modeling during the analysis of different structural tools,a modular mechanical model of lunar surface sampling was proposed.In this model,the complex sampling machine was divided into several basic surface units.The force of the surface unit in the sampling process was analyzed on the basis of Rankine′s earth pressure theory,the maximum shear strength theory and the ultimate bearing capacity theory of foundation.And the mechanical model of the complex machine was obtained by combining the forces of each surface unit.The theoretical model was verified by penetration tests with different machine forms and penetration angles based on lunar soil simulant.The error rate of the theoretical model was reduced to 8.2% by introducing the effect correction formula of the lunar soil density along the depth.The results show that the mechanical model and modular theory are feasible,which provides a reference for the design and development of the lunar surface sampling tool in the future.

Key words:  , lunar surface sampling, mechanical model, modular theory, soil-tool interaction, lunar soil simulant