Design and experimental performance verification of a thermal property test-bed for lunar drilling exploration |
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Institution: | 1. School of Mechanical Engineering and Automation, Beihang University, Beijing 100083, China;2. China Academy of Space Technology, Beijing 100094, China |
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Abstract: | Chinese Chang’e lunar exploration project aims to collect and return subsurface lunar soil samples at a minimum penetration depth of 2 m in 2017. However, in contrast to those on the Earth, automated drilling and sampling missions on the Moon raise the risk of burning bits. Test-beds are required for testing the thermal properties of drill tools in a lunar environment. In this paper, a novel temperature measuring method based on thermocouples and a slip ring was proposed. Furthermore, a data acquisition system for a drilling process was designed. A vacuous, cryogenic, and anhydrous soil environment simulating the lunar surface was established. A drilling test-bed that can reach a depth of 2.2 m was developed. A control strategy based on online monitoring signals was proposed to improve the drilling performance. Vacuum and non-vacuum experiments were performed to test the temperature rising effect on drill tools. When compared with the non-vacuum experiment, the vacuum temperature rise resulted in a 12 ?C increase. These experimental results provide significant support for Chinese lunar exploration missions. |
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Keywords: | Drilling test bed Lunar drill Lunar environment simula-tor Temperature measurement Thermal property |
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