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 11 of 11 for “"Lagrange points"”.
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Computationally Efficient Optimization of Formation Flying Trajectories, with Solar Radiation Pressure, near Lagrange Points
… intends to operate in the regime of the second Lagrange point (𝐿₂) of the Sun-Earth system. While Sun-Earth 𝐿₂ provides several advantages from an imaging standpoint, it also offers a rich solution space of naturally occurring dynamics well-known to the restricted three-body problem. This …
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Optimization of Spacecraft Formations about Lagrange Points for the Next Generation Space Weather Prediction Mission
… a multi-spacecraft mission at various libration points whose objective is to forecast Space Weather hazards with a 12day warning time. This thesis deals with the design and control of orbits of spacecraft formations at different libration points. The systems studied are SunEarth, SunVenus, …
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Transport geometry of the restricted three-body problem
… transport theory that relies on linearizing the Lagrange points in the CR3BP to time-periodic perturbations of the CR3BP, such as the bicircular problem (BCP) and the elliptic restricted three-body problem (ER3BP). The Lagrange points are no longer invariant under perturbation and are replaced by …
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Orbit and Attitude Control for (non-) Rotating Space-Based Telescopes Utilizing Reflectivity Control Devices
… in unstable orbits such as the Sun-Earth Lagrange points. Therefore, there exists a need for novel methods that allow space telescopes to reduce fuel usage and satellite's volume and mass. To address fuel reduction and increase mission lifetime, reflectivity control devices (RCDs), or …
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Significance of Specific Force Models in Two Applications: Solar Sails to Sun-Earth L4/L5 and GRAIL Data Analysis Suggesting Lava Tubes and Buried Craters on the Moon
… parking orbit to the vicinity of triangular Lagrange points. Thereafter, an optimization scheme assisted in investigating the ΔV requirement to depart from the Earth parking orbit. Harnessing the solar radiation pressure, the spacecraft is delivered to the vicinity of the displaced Lagrange …
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Surfing the Bar to the Solar Circle
… their stable orbits by surfing the stable Lagrange points of a growing and slowing bar. NGC 6791 is a massive metal-rich open cluster in the Milky Way located within the solar circle. Its current mass is measured to be of order magnitude 1,000 solar masses. The age of the cluster is …
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Automated detection of invariant manifold intersections using grid based approach
… are the invariant manifolds of the Euler-Lagrange points. The construction of LE trajectories in the CR3BP is most often accomplished by manually finding homoclinic and/or heteroclinic intersections of invariant manifolds located on specific Poincare surfaces of section. Historically, …
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The Methodology of Modelling the Milky Way with Stellar Streams
… the approximate location of the inner and outer Lagrange points with different Galactic velocities than the progenitor. It provides a marginal improvement on the streakline method and consistently recovers the circular speed at the location of the observer. The distribution method holds a great …
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Solar Sailing Adaptive Control Around the Earth-Moon Lagrange Point L4 for Stellar Observations
… the neutrally stable dynamics of equilateral Lagrange points and solar radiation pressure. To assess mission feasibility, the spacecraft's trajectory is initially designed using low-thrust propulsion in a nonlinear optimal control problem.</p> <p>We further transition solar sailing periodic …
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Interplanetary Transfer Trajectories Using the Invariant Manifolds of Halo Orbits
… manifolds of halo orbits about Sun-planet Lagrange points are used to aid in the transfer from one planet to another, and can lead into orbital insertion about the destination planet or flyby trajectories to get to another planet. This work uses this method of dynamics to test transfers …
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HEXANE : architecting manned space exploration missions beyond low-earth orbit
… to demonstrate. It also examines the use of Lagrange points as destinations for precursor sub-missions. Results from this tool are presented for lunar and low-energy NEA missions using metrics representing both individual sub-mission properties as well as sequence-level properties. Finally, a …