Development Of Impact Penetration Type Of Lunar Soil Sampler

Rotary drill sampling and impact penetration sampling are two common methodsto obtain lunar soil samples. Compared with the rotary drill sampling methods, samplescored by impact penetration type maintained more favorable stratification information.By static impact (manual hammering) action, lunar particles near the core drilling(coring tube) produced force chain, which increases friction between lunar soil particlesand the surface of core tube. High-frequency dynamic impact can destroy chainformation, driven lunar soil particles near coring tube surface move to lunar surface.Using the core tube with anisotropic friction surface morphology can enhance themigration of the particles and improve core rate. Therefore, this paper puts impact stresswave transmission characteristics, particle directional transport mechanism, anisotropicfriction surface morphology as the main line and conducted program design structuraldesign and experimental research of impact penetration type lunar soil sampler.Firstly, check relevant information; summarize the characteristics of the samplingdevice and manual sampling device, proposed a non-rotating, multi-pole group receivedand penetrating sampler’s program, established kinetic modeling of the impact process,get impact stress in coring tube as a function of position and time, analyze themechanism of unidirectional transport of the particles and the impact of the role ofanisotropic friction surface morphology and the effect of migration.Secondly, through comparative analysis, it has determined the overall sampling andthe functional units design. The sampler composed by impact driving mechanism coringmechanism, coring interfaces, support units. Barrier mechanism can ensure the samplesstored in the core tube without leakage. Analyze driving torque, vibration frequencyresponse characteristics. Check the main load-bearing components such as gears.Complete detailed structural design of various components and machine the prototype.Finally, through implementing impact test, measured transfer characteristicparameters of the stress wave in coring tube. Obtained core rate at different vibrationfrequency and different coring tube surface topography conditions by analog samplingtrials. Analyzed the influence of the vibration frequency and coring tube surfacetopography impact on the core rate. It has provided a basis for optimizing the technicalparameters of the sampler.This paper completed development of the lunar soil sampler with impactpenetration and contribute to lunar surface manual sampling task of China.