Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 36 for “"debris removal"”.
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Feasibility of Microsatellite Active Debris Removal Systems
<p>Space debris has become an increasingly hazardous obstacle to continued spaceflight operations. In an effort to mitigate this problem an investigation of the feasibility of a microsatellite active debris removal system was conducted. Through proposing a novel concept of operation, utilizing a …
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Orbital Debris Removal Technologies: A Hybrid Electrodynamic Tether and Ion Beam Shepherd Satellite Design for Fuel Efficient Contactless Debris Removal
<p>Space debris poses a serious threat to humanities efforts at space exploration as well as the expanding uses for earth-orbiting satellites. This thesis investigates the proposed technologies for the debris's removal both large and small. Focus is applied to the large debris removal technologies …
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Asteroid deflection and active debris removal methods with spaceborne lasers
… the case where the target is a manmade piece of debris orbiting around the Earth instead of an asteroid.;In this case, pulsed lasers rather than CW lasers are considered in order to maximize the achievable laser intensity (TW/m2 can be achieved even with a few watts of average power and moderate …
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A Viable Orbital Debris Mitigation Mission using Active Debris Removal
… environment contains a growing number of orbital debris objects. This growing orbital debris population increases collision probabilities between both orbital debris and functioning satellites. A phenomenon known as Kessler Syndrome can be induced if these collisions occur. Kessler Syndrome states …
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Visual Servo Based Space Robotic Docking for Active Space Debris Removal
This thesis developed a 6DOF pose detection algorithm using machine learning capable of providing the orientation and location of an object in various lighting conditions and at different angles, for the purposes of space robotic rendezvous and docking control. The computer vision algorithm was …
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Studies on cell disruption and cell debris removal in downstream bioprocessing
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Applied Biological Sciences, 1989.
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A Feasibility Study of CubeSat Architectures for Space Debris Removal from Low Earth Orbit
The rapid increase of space debris in low earth orbit has had tangible impacts on government and commercial missions and caused growing concern among the space community. Removal of collision-prone objects using deorbiter satellites represents a viable strategy for stabilizing the debris …
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Long-term effects of satellite megaconstellations on the debris environment in low earth orbit
… will affect their contributions to orbital debris over the next 150 years. A new, medium-fidelity simulation for modeling orbital debris is developed and described, and several test cases are run with SpaceX’s Starlink megaconstellation and varying success rates for post-mission disposal. In …
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Autonomous rendezvous and docking with tumbling, uncooperative, and fragile targets under uncertain knowledge
… close proximity maneuvers include active debris removal, satellite servicing, and in-space assembly. Active debris removal will facilitate the continued use and access to low Earth orbit, mitigating the exponential debris growth occurring due to decrepit satellites and rocket bodies …
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Optimal Trajectory Planning and Compliant Spacecraft Capture Using a Space Robot
… two of three phases associated with on-orbit debris removal are proposed. The first phase concerns the development of optimal space robot manipulator deployment manoeuvres which ensure zero-attitude displacement by the end of the trajectory. Three common pseudospectral optimal control tools …
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Troubleshooting, optimization and robustness testing of CeBER process for c-phycocyanin extraction and purification from spirulina
… c-phycocyanin leaching rom biomass, cell debris removal via centrifugation, c-phycocyanin purification via polyethylene glycol-citrate and polyethylene glycol-maltodextrin aqueous two-phase separation, c-phycocyanin purification via ammonium sulfate precipitation), where the main aim was …
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Solar Sailing Adaptive Control Using Integral Concurrent Learning for Solar Flux Estimation
… two missions are considered: (1) a geostationary debris removal case and (2) an Earth-Mars interplanetary transfer orbit following a logarithmic spiral reference trajectory. The proposed formulation demonstrates the benefit of estimating the solar flux using integral concurrent learning. Results …
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Investigation of Orbital Debris Situational Awareness with Constellation Design and Evaluation
Orbital debris is a current and growing threat to reliable space operations and new space vehicle traffic. As space traffic increases, so does the economic impact of orbital debris on the sustainability of systems that increasingly support national security and international commerce. Much of the …
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Effects of Inlet Design on Hydraulic Efficiency and Sediment Cleanout of Bridge Deck Drains
… by grate design, downspout configuration, and debris accumulation. Inadequate drainage can result in hydroplaning, which can diminish highway safety. To evaluate the controls on drainage inlet efficiency and compare currently deployed inlet design performances, 576 controlled laboratory …
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The role of forest debris in a southeastern stream and the effects of its removal on trout populations
… Creek, in 1975 and 1976. Besides providing cover debris accumulations generally caused a reduction in stream velocity with accompanying deposition of smaller substrate types. Removal of debris caused a shift to larger substrates. A multiple regression treatment of the physical characteristics and …
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Real-time quasi-analytical trajectory generation for docking with tumbling objects
… prominent with increased interest in active debris removal, satellite servicing, and in-space assembly. Guidance and control algorithms have been developed in the literature to allow for a spacecraft to capture an uncooperative and tumbling object under several constraints such as collision …
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Probabilistic and learning approaches through concurrent parameter estimation and adaptive control for in-space robotic assembly
… of in-space robotic servicing, assembly, and debris removal have received particular attention from both research and industry communities. The presence of uncertainties and unknown system parameters amongst these missions is prevalent, as they primarily deal with unknown or uncooperative …
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Evolutionary Spacecraft Design Using a Generalized Component-Resource Model
… well as to the design of low Earth orbit active debris removal spacecraft constellations.
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