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 22 for “"Orbital dynamics"”.
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The orbital dynamics of advanced planetary observation systems
The increasing interest from the science community to obtain greater quality and quantity of data from Earth and other planets in the Solar System drives research towards developing new means of performing space-based observation. This thesis attempts to address some aspects of this issue by …
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The orbital dynamics and long-term stability of planetary systems
… population of low-mass exoplanets with short orbital periods has been discovered using the transit method. At least 40% of these planets are actually part of compact systems with more than one planet. The closeness of the planetary orbits in these multi-planet systems leads to strong dynamical …
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Natural and artificial orbits around the Martian moon Phobos
… moon to be very close to its surface. Therefore, orbital dynamics around Phobos are particularly complex, because many strong perturbations are involved. The classical models of the Keplerian two-body problem, and the circular three-body problem are not accurate enough to describe the motion of a …
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Formation Flying Performance Measures for Earth Pointing Missions
… of such formations vary during an orbit due to orbital dynamics, and over longer time scales due to perturbations. Selection of a configuration should be based on overall performance of the formation. In this thesis, performance measures are developed and evaluated based on integration over one …
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Control of spacecraft in proximity orbits
… Both classes of missions rely on accurate dynamics models for fuel minimization and observance of strict constraints for preventing collisions and achieving mission objectives. This thesis presents improvements to spacecraft dynamics modeling, orbit initialization procedures, and failsafe …
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Target search methods for space situational awareness
… and time consuming problem. Considering orbital dynamics, sensor uncertainties and the initial size of candidate location distribution, it is desirable to develop efficient search techniques. In this work, information-theoretic methods for searching a target in a large probability …
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Developments for the Characterization of Spacecraft Proximity Operations for Improved Space Situational Awareness
… together. Various combinations of relative orbital dynamics, vehicle characteristics, and environmental conditions can be used to determine the potential intent of these close proximity operations. First, a baseline framework is developed to classify the different formations of a satellite …
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Macro-scale space systems for geoengineering
… and an Earth ring. For all of these concepts the orbital dynamics and other contributing factors were considered to determine the mass of dust required to sustain the dust cloud, which is used as the main benchmark of feasibility. As well as this, the engineering feasibility of each concept is …
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Ondas gravitacionais em teorias de gravitação quadrática
… is also made and, in particular, we study the orbital dynamics and the waveform that would be observed by a detector. Finally, we compare the results with General Relativity and obtain constraints in the parameters of the theory.
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The Shadow of the comet : divine patronage in the rise of Augustus by Dora Y. Gao.
… Poisson statistics, basic calculations of orbital dynamics, and historical context. The physical manifestation of this comet over Rome granted Octavian the opportunity to begin asserting himself as a legitimate political competitor in the wake of Julius Caesar's death and his adoption in …
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Multi agent control for space based interferometry
… under the influence of libration<br/>point orbital dynamics. The main focus is on the development of key agent skills,<br/>including state estimation, guidance, control and decision methods to attain the desired<br/>system output; within the consideration of decision methods, a comparison …
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Modeling the Dynamics of Black Hole Systems and the Ringdown of Black Hole Spacetimes
… the worldline for plunging bodies with varying orbital geometries. Perturbations about Kerr spacetime are a linear superposition of quasinormal modes, and we calculate the amplitude of these mode frequencies as excited by a plunging body. The key result is that the mode amplitudes can be cleanly …
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In Space Reverse Logistics
… implemented to collaborate with a custom-made orbital propagator to work as a space logistics simulator. The ISRL Failure Model is a modular and resilient binary random stochastic process with time-varying probability distributions for orbital simulations that operate agnostically from the …
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Formation of Low-Mass X-Ray Binaries
… of asymmetric supernova (SN) explosions on orbital dynamics are studied in detail and analytical expressions for the distributions of binaries over post-SN characteristics are derived. As a necessary ingredient of the population models, the binary properties of nascent LMXBs are investigated …
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Solar radiation pressure, drag and gravitational effects on a dust particle in Earth orbit
… light from the Sun. Colombo et. al studied the orbital dynamics of ``smart-dust'' under the effects of SRP and atmospheric drag. The numerical model developed here will expand on that work, but will use Hamiltonian equations of motion instead of Gauss’ equations. This approach easily …
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Orbital stability in a classical pilot-wave system
… the features responsible for the quantisation of orbital radii, and rationalises this quantisation in terms of the stability of circular orbits arising in the presence of a rotating frame and a central force. We find that orbital quantisation is most pronounced when the waves generated by each …
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Angles-only navigation technique for maneuver-free spacecraft proximity operations
… and the target. In the space environment, the orbital dynamics are inherently nonlinear and natural orbit perturbations have the effect of continuous micro-maneuvers. These advantageous conditions present an opportunity to overcome the ambiguity problem and enable spacecraft to navigate …
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Interplanetary Transfer Trajectories Using the Invariant Manifolds of Halo Orbits
… of interplanetary space travel, the Newtonian dynamics of the two-body problem have been used to design orbital trajectories to traverse the solar system. That is, that a spacecraft orbits only one large celestial body at a time. These dynamics have produced impressive interplanetary …
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Modeling the Future Space Debris Population and Orbital Capacity
… In this thesis, the development of the MIT Orbital Capacity Analysis Tool (MOCAT) is described along with conclusions and insights. MOCAT is a novel open-source approach to evaluating the LEO environment and comprises of a Source Sink Evolutionary Model (SSEM) and a Monte Carlo (MC) method. …
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Frequency chirping of energetic particle driven modes in tokamaks; Self-consistent modelling and simulation
… to electromagnetic waves and also fast particle orbital dynamics should be captured. In this work, a model is developed to investigate the effect of fast particle dynamics in tokamaks using a 1D description. This new trapped/passing model demonstrates how energetic particle orbits can impact the …
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