嫦娥五号月壤剖面钻进取芯状态分析与解译

Analysis on Drilling and Coring Process and Lunar Regolith Stratification State Interpretation in Chang’E-5

嫦娥五号探测器通过表取和钻取的方式分别采集了表层和剖面月壤,并将月壤样品返回地球。月面钻进取芯过程的遥测数据直接反映了采样钻具与剖面月壤之间的相互作用状态,对其进行分析与解译能提高月面钻取采样任务的科学价值。基于嫦娥五号钻取采样装置的系统构成、工作原理和性能指标,从遥测数据中辨识出代表性钻进取芯工况。结合机-壤相互作用机理以及地面钻取采样试验数据,分析钻进取芯过程及其负载波动状态的月壤组构致因,并对全钻进剖面的月壤层序状态进行机理性解译。研究表明,嫦娥五号钻进点月壤剖面至少具有三个明显的层序结构,钻进剖面内存在着毫米级尺度月壤颗粒;钻取采样装置面对非确知月壤剖面已充分发挥其预定效能,并针对我国后续拟实施的星壤剖面采样探测技术做出了展望。

Chang’e-5 lunar mission has gathered lunar regolith on the surface and sub-surface by an automatic sampling process combined by drilling and excavating, achieving the return of the lunar soil sample. The telemetry data from drilling and coring process on lunar surface reflects the interaction between the sampler and in-suit lunar regolith, which can improve the scientific value of the drilling and coring process by its analysis and interpretation. According to the system constitution, principle and performance index of drilling and coring device, and typical operation conditions are defined by the characteristics of the telemetry data. Based on the interaction mechanism between coring drill and lunar regolith and the test data from drilling experiments on Earth, the analysis of lunar regolith composition and characteristics are presented with the fluctuation drilling loads of the drilling and coring process. The explanation of the lunar regolith stratification state in the drilling site is given. The analysis indicates that the regolith stratification in Chang’E-5 drilling spot has at least three different composition and properties, and millimeter-size particles are existed in the drilling spot. The drilling and coring device has fully performed with its efficiency facing the unknown lunar regolith profile, and the outlook about future extraterrestrial regolith profile sampling technique of China is introduced.