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在月球钻取采样器的设计中,软袋取心方式可获得细长的连续钻取样心,具有较高的取心率,并能够保证次表层月壤样品的层理信息.由于取心过程中月壤颗粒运动复杂,尚无系统的方法对软袋取心的取样量影响因素进行分析.剖析了软袋取心中月壤颗粒的流动情况,基于极限平衡理论构建了软袋取心力学模型.该模型以月壤和取心钻具之间以及各部分月壤之间的相互作用为力学边界条件,描述了月壤从取心钻具外进入取心软袋内的动力学过程.基于该模型提出了预测取心率数值计算方法,分析了钻进规程、月壤特性和钻具构型等因素对取心率的影响.利用HIT-LS1#模拟月壤和HIT-2型试验钻具开展了钻进取样试验,取心率的理论预测值与试验结果的平均误差小于5%.
In the design of the lunar drill sampler, the soft bag coring method can obtain a slender continuous sample heart, which has a high heartbeat rate and ensures the bedding information of the subsurface lunar sample. Due to the coring process The particle movement in lunar soil is complicated and there is no systematic method to analyze the influencing factors of the sampling volume of the soft bag coring.Through analyzing the flow of lunar particles in the coring of soft bag coring, the coring model of the soft bag is constructed based on the limit equilibrium theory. Based on the interaction between lunar soil and coring tools and lunar soil, the model describes the dynamic process of lunar soil entering coring soft pouch outside coring tool.Based on the model The numerical method of predicting heart rate is put forward and the influence of drilling schedule, lunar soil characteristics and configuration of drilling tools on the coring rate is analyzed.With HIT-LS1 # simulation lunar soil and HIT-2 experimental drilling tools, drilling Sampling test, the heart rate of the theoretical prediction and the experimental results of the average error of less than 5%.