| Citation: | SUN Qichen, JIANG Kun, WANG Hailiang, et al. Design and verification of an adjustable length safety tether for astronaut extravehicular activities[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(7): 1353-1361. doi: 10.13700/j.bh.1001-5965.2020.0184(in Chinese)
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With the steady progress of Shenzhou spaceship series tasks and space station construction tasks in China, Chinese astronauts are facing frequent extravehicular activities, the range of astronauts' extravehicular activities will gradually increase, and the operation position of astronauts will change frequently. The traditional safety tether can not operation the requirements. In this paper, a design scheme of an adjustable length safety tether for astronaut extravehicular activities driven by constant force spring is put forward, the design method is optimized, and the detailed design of the driving unit which is the core part of the safety tether is performed. Finally, the prototype of safety tether is developed, and the functional performance test, environmental adaptability test and driving unit life test are completed. The results show that the scheme of the safety tether can successfully complete the retraction and release of steel wire rope, and the measured retracting force and pulling force are basically consistent with the theoretical values. It has the advantages of small volume, light weight, and resistance to a large number of levels of vibration and high and low temperature environment. The driving unit can meet the requirements of 10 000 times of long-life use. The scheme of the safety tether can be used in subsequent engineering products.
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