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Yaotang Ji,Hongli Suo,ZiLi Zhang,Lin Ma,Jiazhi Li,Chengxi Zhang,Xingyu Wu,Shaheen Kausar,Jin Cui,Min Liu,Yi Wang,Qiuliang Wang 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5
Three types of Ni8W/Ni12W/Ni8W composite substrates with strong cube texture, high yield strength, and low magnetizationwere produced by heavy cold rolling and annealing processes. The three types of composite substrates have the same thickness,but the ratios of thickness between Ni–8 at%W and Ni–12 at%W layer are different. The contents of tungsten exceed9.3 at%, 10 at%, and 10.3 at% in the three types of obtained substrates. The presence of Ni alloys with higher W content inthe Ni–12 at%W of the three composite substrates strongly enhanced the mechanical properties with about 290, 300 and315 MPa respectively, and decreased the ferromagnetic behavior of the whole substrates. Additionally, it was found that anarea that enhances cubic nucleation and growth in the Ni8W layer of composite substrates.
Lei Zhao,Changqing Yuan,Ling Gao,Chengxi Zhang 한국항공우주학회 2023 International Journal of Aeronautical and Space Sc Vol.24 No.2
The aim of this paper is to analyze dynamic characteristics and stability of magnetic sail-based planetary displaced orbits, and the feasibility of using a magnetic sail as an advanced propellantless control technology for formation flying around elliptic planetary displaced orbits (EPDOs). The thrust can be obtained from the momentum exchange between solar wind and an artificial magnetic field. First, the requirements of a magnetic sail for generating and maintaining a planetary circular displaced orbit is discussed including the value of attitude angles and characteristic acceleration. Based on different orbital periods, the circular displaced orbits are divided into three types and their linear stability is analyzed. For elliptical orbits, the conditions required to maintain an EPDO are investigated and the dynamical models of magnetic sail formation system are established. A finite time coordinated control algorithms relying on the protocols formulated on an undirected communication graph is proposed to achieve synchronized formation tracking rapidly while enhancing the robustness of formation system due to information interaction between spacecraft. Several numerical simulations are conducted to demonstrate that spacecraft formation can be effectively controlled by the proposed propellantless propulsion system.