On the stability of the track of the space elevator

Pugno, Nicola; Schwarzbart, Michael; Steindl, Alois; Tröger, H.

doi:10.1016/j.actaastro.2008.10.005

Cited by 26 publications

(5 citation statements)

References 16 publications

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“…The tether is in equilibrium by the balance of centripetal and gravitational forces acting on it; the payload is then lifted to the desired altitude along the tether and, if synchronous orbit is reached, the payload could increase its altitude without further work required. A wide range of studies are available in the literature, investigating design, materials, tether oscillation and stability [10][11][12][13][14][15][16][17], mainly for Earth applications.…”

Section: Introductionmentioning

confidence: 99%

Analytical mechanics of asteroid disassembly using the Orbital Siphon effect

2018

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A chain of tether-connected payload masses assembled from the surface material of a spherical rotating asteroid is envisaged as a means of delivering a fraction of the asteroid mass into orbit, without the need of external work to be done. Under conditions to be discussed, a net radial force is established on the chain which can be exploited to initialize an orbital siphon effect: new payloads are connected to the chain while top payloads are removed and released into orbit. Adopting simplifying assumptions, the underlying dynamics of the problem is entirely analytical and is investigated in detail. The amount of mass extractable from the asteroid is then discussed, according to a range of strategies. It is proposed that the scheme could in future provide an efficient means of extracting material resources from rotating Near Earth Asteroids.

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Section: Introductionmentioning

confidence: 99%

Analytical mechanics of asteroid disassembly using the Orbital Siphon effect

2018

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“…This instability is due to an orbital instability. Table 3 in [25]. Only for length ratios, where λ is positive, the second variation of (14) is positive definite.…”

Section: Wwwgamm-mitteilungenorgmentioning

confidence: 94%

Tethered satellite systems: A challenge for mechanics and applied mathematics

Schwarzbart

Steindl

Steiner³

et al. 2009

GAMM-Mitteilungen

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Tethered satellite systems that is two or more satellites in orbit connected by thin long cables, pose a number of challenging problems in mechanics concerning modeling and derivation of the equations of motion and in applied mathematics, concerning the numerical simulation of their dynamics, deciding on stability of relative equilibria and the proof of chaotic dynamics. We also compare for the practically important process of deployment of one satellite from another satellite uncontrolled deployment with steered deployment, according to Pontrijagin's Maximum Principle. Related to the stability of relative equilibria, as example the Space elevator, which is a tethered system extending from the surface of the Earth beyond geostationary height, is considered.

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“…It would seem likely that today's fictional yearnings for nanobots 326,367,368 and space elevators [369][370][371][372][373][374][375][376] for lifting us beyond the atmosphere may end up in realised states quite different from our imaginations. Ultra-strong cables made of long, woven CNT ropes may be more or less feasible [377][378][379][380][381] than new steels 382 or some as-yet undiscovered materials 383 for lofting payloads into low-earth orbit along a mechanical conveyor line from a high-altitude platform to a counter-weighted satellite without a conventional process of rocketing or flying. Various space elevator designs fancied and predicted by a number of futurists may fail for manifold reasons having no correlation with CNT-based mechanical strength limitations.…”

Section: Nanobots Elevators To Space and The Twenty-first Century Out...mentioning

confidence: 99%

Mechanical properties of selected nanostructured materials and complex bio-nano, hybrid and hierarchical systems

Aston

Bow

Gangadean

2013

International Materials Reviews

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Fundamental investigations into mechanical behaviour and properties, e.g. elasticity, plasticity, hardness, toughness, strength and failure, exhibited at the nanoscale have increased rapidly in number and in breadth over the past two decades as experimental techniques and theoretical treatments have advanced. This review covers selected contemporary nanomechanics research and gives an overview of some fundamental questions, measurement challenges and opportunities concerning nanostructured materials, their mechanical properties and deformation mechanisms -particularly, relationships with size-scale phenomena. Significant theoretical developments are mentioned in relevant sections and advances in computational modelling are considered briefly, including perspectives on the current state and gaps between complete and rigorous simulations for mechanical behaviour in nanomaterials and experimental data to qualify certain predictive calculations. We categorise the study of mechanics by nanomaterial types from primary objects (i.e. single nanoscale elements like nanofibres and nanopillars), simple composites and other extended nanostructures like films and multilayers to complex natural and synthetic systems ranging from biological cells and mineralised biocomposites to nanoelectromechanical systems and DNA nanorobots. The future outlook and concluding remarks summarise general areas of open knowledge in the field and include a call for increased collaboration between experiments and modelling for the fruition of twenty-first century advancements and exploration.

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On the stability of the track of the space elevator

Cited by 26 publications

References 16 publications

Analytical mechanics of asteroid disassembly using the Orbital Siphon effect

Analytical mechanics of asteroid disassembly using the Orbital Siphon effect

Tethered satellite systems: A challenge for mechanics and applied mathematics

Mechanical properties of selected nanostructured materials and complex bio-nano, hybrid and hierarchical systems

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