Space experiments on basic technologies for a space elevator using microsatellites

Yamagiwa, Yoshiki; Nohmi, Masahiro; Aoki, Yoshio; Momonoi, Yu; Nanba, Hirotaka; Masanori, Aiga; Kumao, Takeru; Masahito, Watahiki

doi:10.1016/j.actaastro.2016.12.022

Cited by 16 publications

(5 citation statements)

References 4 publications

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“…which we write in the form ωg(x) = h(x) providing us with a relation for ω as a function of x: ω = h(x)/g(x) 5 . The sought ω is the smallest solution of this equation so that by taking a derivative and setting it equal to zero we obtain an equation for x corresponding to the extremum, h (x)g(x) = h(x)g (x).…”

Section: The Fast and The Slowmentioning

confidence: 99%

“…This situation is of interest not only in the general relativistic case as a tool to distinguish various non-local effects but also in Newtonian gravity as this effect can be used to stabilize orientation of artificial satellites and even to alter their orbital parameters. In this respect, apart from the seminal thoughts of Tsiolkovsky from 1895, the first papers on tether-controlled satellites appeared in the 1960s (see [1] for a review of literature) with research continuing until this day [2][3][4] and there have even been in-orbit experiments (for example, the Gemini XI mission in 1966 and, more recently, STARS-C aboard ISS [5]). Likewise, in general relativity this effect can influence the trajectory of an oscillating body, pushing it into a higher or lower orbit, speeding up or slowing down its descent or ascent in a predefined background spacetime but it can also be used as a tool to investigate the properties of a given gravitational field, perhaps distinguishing between various field characteristics in the resonance regime that would remain below detection threshold with a single point particle approach.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

How to glide in Schwarzschild spacetime

Veselý¹,

Žofka²

2019

Class. Quantum Grav.

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Section: The Fast and The Slowmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

How to glide in Schwarzschild spacetime

Veselý¹,

Žofka²

2019

Class. Quantum Grav.

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“…Their analysis shows that the classical TPDB model is accurate in describing the overall motions of the PSE and suitable for control law development, provided the control law is robust. Besides the theoretical studies, Yamagiwa et al [14] investigated the PSE from an engineering aspect for space demonstration.…”

Section: Introductionmentioning

confidence: 99%

Libration-free cargo transfer of floating space elevator

Shi

Zhu

2022

Nonlinear Dyn

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This paper studies the libration-free cargo transfer control of a partial space elevator where the main satellite may change its orbital state in the transfer period. The orbital motion of the main satellite in the climber transfer period is first studied. Then, a reduced-order libration-free dynamics of the partial space elevator is derived.Accordingly, a novel libration-free switching control strategy is proposed to stabilize the cargo transportation with two alternating controllers. The Controller I controls the cargo speed in the libration-free mode by a shrinking horizon model predictive control based on the reduced-order libration-free dynamic mode of the partial space elevator. This leads to high computational efficiency in control. Once the libration is induced by the cargo transfer, the control turns off the Controller I and activates the Controller II to suppress the libration to zero within one time step of the Controller I by a novel prescribed-time control law based on the fixed-time control scheme. The stability of the control is proved in the Lyapunov framework. The validity and effectiveness of the proposed control strategy are demonstrated by computation simulation. Simulation results reveal that the proposed control strategy is effective in keeping stable cargo transportation while ensuring the equilibrium state at the end of transportation.

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“…Due to the exceptional creep resistance of polyarylate fibers, braided polyarylate fiber ropes are particularly favored by spacecraft deployable structures with long-term static load, such as thermal knife hold-down and release device, space tether, mesh expandable antenna, and space habitat. [1][2][3][4] However, the tensile properties of braided polyarylate fiber ropes depend on the loading history that leads to the difficulty of predicting the mechanical behavior of the rope and essentially affects the design of the ropes for the spacecraft deployable structures.…”

Section: Introductionmentioning

confidence: 99%

The effects of preloading on tensile properties of braided polyarylate fiber ropes

Ding

Sun

Dong

et al. 2021

Textile Research Journal

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In the present work, the effects of preloading on the tensile properties of braided polyarylate fiber ropes were investigated experimentally. Four kinds of samples with different pitch lengths were tested with designed preload levels. The deformation responses of the ropes were captured using digital image correlation (DIC) and micro-computed tomography (micro-CT). It is shown that the nonlinearity in the mechanical behavior of the ropes can be almost eliminated post-preloading with one cyclic loading, and the transverse strains are much greater than the longitudinal strains due to the compaction of rope structure because of the spiral interlaced path of braid yarns. The rope with shorter pitch length (larger braid angle) has larger longitudinal strain and smaller transverse strain due to the higher yarn crimp rate and tighter yarns, respectively. The preload level is the most important parameter for preloading. The chord modulus of the ropes reached an optimum level at the preload level of 40% break load, and the tensile strength can be increased by 15% at the preload level of 50% break load. Moreover, the stability of the tensile properties could be accelerated at the higher preload level. Consequently, preloading is vital to improve the tensile properties of braided polyarylate fiber ropes, with a preload level at least of 40% break load and 10 cyclic loadings.

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Space experiments on basic technologies for a space elevator using microsatellites

Cited by 16 publications

References 4 publications

How to glide in Schwarzschild spacetime

How to glide in Schwarzschild spacetime

Libration-free cargo transfer of floating space elevator

The effects of preloading on tensile properties of braided polyarylate fiber ropes

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