On Modeling Drilling Load in Lunar Regolith Simulant

Qi-Quan Quan; Chong-Bin Chen; Zong-Quan Deng; Jun-Yue Tang; De-Wei Tang

doi:10.1186/s10033-018-0207-8

摘要

Drilling and coring, as efective ways to obtain lunar regolith along the longitudinal direction, are widely applied in the lunar sampling feld. Conventionally, modeling of drill-soil interaction was divided into soil cutting and screw conveyance processes, ignoring the diferences in soil mechanical properties between them. To improve the modeling accuracy, a hypothesis that divides the drill-soil interaction into four parts:cuttings screw conveyance, cuttings extruding, cuttings bulldozing, and in situ simulant cutting, is proposed to establish a novel model based on the passive earth pressure theory. An iterative numerical calculation method is developed to predict the drilling loads. A drilling and coring testbed is developed to conduct experimental tests. Drilling experiments indicate that the drilling loads calculated by the proposed model match well the experimental results. The proposed research provides the instructions to adopt a suitable drilling strategy to match the rotary and penetrating motions, to increase the safety and reliability of drilling control in lunar sampling missions.

关键词： Lunar regolith drilling; Lunar regolith simulant; Drill-simulant interaction; Screw conveyance

本文引用格式

Qi-Quan Quan , Chong-Bin Chen , Zong-Quan Deng , Jun-Yue Tang , De-Wei Tang . On Modeling Drilling Load in Lunar Regolith Simulant[J]. Chinese Journal of Mechanical Engineering, 2018 , 31(1) : 20 -20 . DOI: 10.1186/s10033-018-0207-8

Abstract

Drilling and coring, as efective ways to obtain lunar regolith along the longitudinal direction, are widely applied in the lunar sampling feld. Conventionally, modeling of drill-soil interaction was divided into soil cutting and screw conveyance processes, ignoring the diferences in soil mechanical properties between them. To improve the modeling accuracy, a hypothesis that divides the drill-soil interaction into four parts:cuttings screw conveyance, cuttings extruding, cuttings bulldozing, and in situ simulant cutting, is proposed to establish a novel model based on the passive earth pressure theory. An iterative numerical calculation method is developed to predict the drilling loads. A drilling and coring testbed is developed to conduct experimental tests. Drilling experiments indicate that the drilling loads calculated by the proposed model match well the experimental results. The proposed research provides the instructions to adopt a suitable drilling strategy to match the rotary and penetrating motions, to increase the safety and reliability of drilling control in lunar sampling missions.

Key words： Lunar regolith drilling; Lunar regolith simulant; Drill-simulant interaction; Screw conveyance

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参考文献