Drilling load modeling and validation based on the filling rate of auger flute in planetary sampling  

作　　者：Quan Qiquan Tang Junyue Yuan Fengpei Jiang Shengyuan Deng Zongquan 

机构地区：[1]State Key Laboratory of Robotics and System, Harbin Institute of Technology

出　　处：《Chinese Journal of Aeronautics》2017年第1期434-446,共13页中国航空学报（英文版）

基　　金：supports by the National Natural Science Foundation of China (No. 61403106, No. 51575122);Program of Introducing Talents of Discipline to Universities (No. B07018) of China;Fundamental Research Funds for the Central Universities (No. HIT.NSRIF.2014051) of China

摘　　要：Some type of penetration into a subsurface is required in planetary sampling. Drilling and coring, due to its efficient penetrating and cuttings removal characteristics, has been widely applied in previous sampling missions. Given the complicated mechanical properties of a planetary regolith, suitable drilling parameters should be matched with different drilling formations properly.Otherwise, drilling faults caused by overloads could easily happen. Hence, it is necessary to establish a drilling load model, which is able to reveal the relationships among drilling loads, an auger＇s structural parameters, soil＇s mechanical properties, and relevant drilling parameters. A concept for the filling rate of auger flute（FRAF） is proposed to describe drilling conditions. If the FRAF index under one group of drilling parameters is less than 1, this means that the auger flute currently removes cuttings smoothly. Otherwise, the auger will be choked with compressed cuttings. In drilling operations, the drilling loads on the auger mainly come from the conveyance action, while the drilling loads on the drill bit primarily come from the cutting action. Experiments in one typical lunar regolith simulant indicate that the estimated drilling loads based on the FRAF coincide with the test results quite well. Based on this drilling load model, drilling parameters have been optimized.Some type of penetration into a subsurface is required in planetary sampling. Drilling and coring, due to its efficient penetrating and cuttings removal characteristics, has been widely applied in previous sampling missions. Given the complicated mechanical properties of a planetary regolith, suitable drilling parameters should be matched with different drilling formations properly.Otherwise, drilling faults caused by overloads could easily happen. Hence, it is necessary to establish a drilling load model, which is able to reveal the relationships among drilling loads, an auger＇s structural parameters, soil＇s mechanical properties, and relevant drilling parameters. A concept for the filling rate of auger flute（FRAF） is proposed to describe drilling conditions. If the FRAF index under one group of drilling parameters is less than 1, this means that the auger flute currently removes cuttings smoothly. Otherwise, the auger will be choked with compressed cuttings. In drilling operations, the drilling loads on the auger mainly come from the conveyance action, while the drilling loads on the drill bit primarily come from the cutting action. Experiments in one typical lunar regolith simulant indicate that the estimated drilling loads based on the FRAF coincide with the test results quite well. Based on this drilling load model, drilling parameters have been optimized.

关 键 词：CORING Drilling load Filling rate of auger fluteLunar regolith simulant Planetary drilling 

分 类 号：P184.5[天文地球—天文学]