基于模糊应力-强度模型的空间系绳碰撞可靠性

Space tether system has attracted more and more attention from various countries because of its special structure. The collision reliability research of space tether is an important part of the mission design of space tether. In this paper, the stress-strength model is used to analyze the reliability of space tethers on-orbit collision based on the space debris flux and Poisson distribution on low-Earth orbit. Several tether structure factors those have an impact on the collision reliability of space tethers are proposed, such as tether’s diameter and length for single-strand space tether, and tether’s distance between ropes, collision angle for double-strand tether. Firstly, the tether residual cross-section at the collision point is modeled after the space debris impacts and cuts the tether. Then, according to the fuzzy stress-strength model analysis, the tether destructive collision probability is calculated. Finally, according to the Poisson method, the reliability of the space tether is calculated over time, and the simulation analysis is carried out to compare the effective on-orbit time of space tether with different structures.