淺表層月壤鏟挖采樣的振動減阻技術(shù)仿真研究
Simulation of vibration drag-reduction in the excavation sampling of lunar regolith
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摘要: 文章對振動鏟挖技術(shù)在淺表層月壤采樣過程中的適用性進行了研究。根據(jù)月壤宏觀,、細觀參數(shù),，采用離散元法建立了月壤模型，對月球表面低重力低氣壓環(huán)境下的月壤應力—應變特性進行仿真,，并結(jié)合采用Balovnev機—土交互模型描述的月壤鏟挖阻力公式,，對月壤的振動減阻機理進行了分析。在此基礎(chǔ)上,，通過向采樣器施加不同振幅和頻率的振動,，開展了淺表層月壤鏟挖仿真，給出了鏟挖過程中不同振動參數(shù)與月壤采樣阻力的關(guān)系,。同時,，通過對比不同工況下的月壤孔隙率，驗證了月壤的振動鏟挖減阻機理及適用性,。Abstract: The applicability of the vibration drag-reduction in the lunar regolith sampling process is studied in this paper. A lunar regolith DEM model is established according to the lunar microscopic parameters, the stress-strain curve of the lunar regolith is simulated, and the mechanism of the vibration drag-reduction is analyzed with respect to the lunar regolith excavation resistance described by the Balovnev soiltool interaction model. On the basis of the soil model, a lunar regolith excavation simulation is carried out with the vibration buckets in different oscillation amplitudes and frequencies. The relationships between the excavation resistance and loading and different vibration parameters are obtained. Meanwhile, by comparing the partial porosity of the lunar regolith under different vibration conditions, the vibration drag-reduction in the lunar regolith is verified to be applicable for the lunar regolith sampling.
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