月壤钻采进尺力形成机理及进尺力预测建模

Aiming at the problem that the penetration force cannot be accurately predicted in the drilling and mining of lunar soil, the formation mechanism of footage force is analyzed based on the displacement and deformation of lunar soil when the drilling tool is operating in footage and rotary motion modes. The under-reaming pressure generated by the radial soil expansion due to the bit downward footage movement is the core factor determining the footage force. Meanwhile, the footage force prediction model is established, according to the equivalent analytical solution of cavity expansion of cylindrical finite rotation soil. Comparing the ground testing results at low, medium and high rotation speeds with the simulation results, the rationality of the footage force formation mechanism and the accuracy of the footage force prediction model are verified. This study provides theoretical support for the technical breakthrough of other star drilling and sampling missions.