Large constellations assessment and optimization in LEO space debris environment

Olivieri, Lorenzo; Francesconi, Alessandro

doi:10.1016/j.asr.2019.09.048

Cited by 36 publications

(11 citation statements)

References 6 publications

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“…Due to their high velocities, for decades, orbital debris has been considered one of the most important threats to space flight safety 3 . The impact velocity is in the range of 7–10 km s −1 at low earth orbit 4 . This threat is now even bigger with increasing global space activity 5 .…”

Section: Introductionmentioning

confidence: 99%

Polyimide aerogels for ballistic impact protection

Malakooti

Vivod

Pereira

et al. 2022

Sci Rep

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The ballistic performance of edge-clamped monolithic polyimide aerogel blocks (12 mm thickness) has been studied through a series of impact tests using a helium-filled gas gun connected to a vacuum chamber and a spherical steel projectile (approximately 3 mm diameter) with an impact velocity range of 150–1300 m s−1. The aerogels had an average bulk density of 0.17 g cm−3 with high porosity of approximately 88%. The ballistic limit velocity of the aerogels was estimated to be in the range of 175–179 m s−1. Moreover, the aerogels showed a robust ballistic energy absorption performance (e.g., at the impact velocity of 1283 m s−1 at least 18% of the impact energy was absorbed). At low impact velocities, the aerogels failed by ductile hole enlargement followed by a tensile failure. By contrast, at high impact velocities, the aerogels failed through an adiabatic shearing process. Given the substantially robust ballistic performance, the polyimide aerogels have a potential to combat multiple constraints such as cost, weight, and volume restrictions in aeronautical and aerospace applications with high blast resistance and ballistic performance requirements such as in stuffed Whipple shields for orbital debris containment application.

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Section: Introductionmentioning

confidence: 99%

Polyimide aerogels for ballistic impact protection

Malakooti

Vivod

Pereira

et al. 2022

Sci Rep

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“…Moreover, the reliability of satellites will gradually decrease over time, according to the Ref. (Olivieri and Francesconi, 2020) it will decrease to 40% in 25 years, plenty of derelict satellites will be left in the orbit and make the environment of the Low Earth orbit worse. To avoid collisions, many countries have taken measures, e.g.…”

Section: Introductionmentioning

confidence: 99%

Collision response and obstacle avoidance of the tethered-space net robot system with non-target objects

Wei

Pang

et al. 2022

AEAT

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Purpose This paper aims to study the encounter issues of the Tethered-Space Net Robot System (TSNRS) with non-target objects on orbit during the maneuver, including the collision issues with small space debris and the obstacle avoidance from large obstacles. Design/methodology/approach For the collision of TSNRS with small debris, the available collision model of the tethered net and its limitation is discussed, and the collision detection method is improved. Then the dynamic response of TSNRS is studied and a closed-loop controller is designed. For the obstacle avoidance, the variable enveloping circle of the TSNRS has coupled with the artificial potential field (APF) method. In addition, the APF is improved with a local trajectory correction method to avoid the overbending segment of the trajectory. Findings The collision model coupled with the improved collision detection method solves the detection failure and speeds up calculation efficiency by 12 times. Collisions of TSNRS with small debris make the local thread stretch and deforms finally making the net a mess. The boundary of the disturbance is obtained by a series of collision tests, and the designed controller not only achieved the tracking control of the TSNRS but also suppressed the disturbance of the net. Practical implications This paper fills the gap in the research on the collision of the tethered net with small debris and makes the collision model more general and efficient by improving the collision detection method. And the coupled obstacle avoidance method makes the process of obstacle avoidance safer and smoother. Originality/value The work in this paper provides a reference for the on-orbit application of TSNRS in the active space debris removal mission.

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“…Space debris removal is important due to the emergence of megaconstellation projects [11][12][13]. This increases space debris risks in the low earth orbit [14][15]. Furthermore, the increased launch of low cost small satellites in mega-constellations results in a higher volume of space based data requiring processing to enable decision making.…”

Section: Introductionmentioning

confidence: 99%

Data Rich Architecture for Future Space Applications and Computing

Periola¹,

Alonge²,

Ogudo³

2021

Preprint

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Space applications play an important role in technological advancements. This is because satellites are useful in existing applications like earth observations and future computing (hosting space based data centres). In these applications, satellites increase the amount of space debris as they reach their end of life. Therefore, the reduction of space debris for hosting future space application is crucial. The discussion in this paper considers that increasing space debris limits the deployment of additional earth observation satellites and future space based data centres. This challenge is addressed in this paper that proposes the use of non–earth’s orbital locations for hosting earth observation satellites and siting space data centres in regions having low debris. In addition, the proposed solution aims to identify regions in space with low space debris for hosting space based data centres. The performance metric is the rate of space debris generation (RSDG). The proposed solutions presents a framework to enable the acquisition and aggregation of data for RSDG computation in a given space region. Regions in non–earth orbital locations are utilized when the RSDG in a given earth’s orbital location exceeds a pre–defined threshold. In addition, the RSDG is formulated via the adaptation of the Shannon relation utilized to formulate the channel capacity in wireless communications. The result of evaluation shows that the RDSG is reduced by 50% on average due to the use of the proposed mechanism.

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Large constellations assessment and optimization in LEO space debris environment

Cited by 36 publications

References 6 publications

Polyimide aerogels for ballistic impact protection

Polyimide aerogels for ballistic impact protection

Collision response and obstacle avoidance of the tethered-space net robot system with non-target objects

Data Rich Architecture for Future Space Applications and Computing

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