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.
Results
Showing 1 to 10 of 10 for “"interplanetary trajectory"”.
-
Interplanetary Trajectory Optimization with Automated Fly-By Sequences
… to share solutions. The program Spacecraft Trajectory Optimization Suite (STOpS) is an island model suite of heterogeneous and homogeneous Evolutionary Algorithms (EA) that analyze interplanetary trajectories for multiple gravity assist (MGA) missions. One limitation of STOpS and other …
-
Orbital Maneuvers and Interplanetary Trajectory Design via Reinforcement Learning
… Classical approaches to low-thrust trajectory design are predominantly grounded in optimal control theory, which relies on the availability of precise dynamical models and often requires problem-specific reformulation and solver tuning. While optimal control methods offer high …
-
Interplanetary trajectory analysis for 2020-2040 Mars missions including Venus flyby opportunities
… a tool which is capable of calculating ballistic interplanetary trajectories with planetary flyby options based on the knowledge of astrodynamics and analyzes Mars trajectories in the time frame 2020 to 2040, including transfer trajectories with Venus flybys. Using the trajectory programs …
-
System level dispersion analysis examining program benefits to a low-thrust interplanetary CubeSat from autonomous guidance and navigation
… of the guidance and navigation (GN) system on trajectory dispersions for a low-thrust CubeSat in route to entry-interface conditions at Mars. Applicable mission plan concepts, appropriate analysis settings, as well as required mission performance used in the analysis were based on input …
-
Uranus orbiter and probe mission : Project Upsilon
… of solar-electric propulsion, with regard to the interplanetary system-level trade tree. The interplanetary trajectory requires a single un-powered flyby of Jupiter, selected among several flyby node configurations. The science orbit produces nearly repeating latitude-longitude tracks over a …
-
Automated planetary satellite tour planning with a novel low-thrust direct transcription method
… mission, it is almost always the case that an interplanetary spacecraft has scientific objectives to accomplish. This is especially true if the spacecraft performs a planetary moon tour. Over the past decade, mission designers have started to consider the use of low-thrust electric propulsion …
-
Automated trajectory planning for multiple-flyby interplanetary missions
… variables and categorical variables. In interplanetary trajectory design problems the categorical variables will typically specify the sequence of planets at which to perform flybys, and the real-valued variables will represent the launch date, flight times between planets, magnitudes and …
-
Spacecraft Trajectory Optimization Suite: Fly-Bys with Impulsive Thrust Engines (Stops-Flite)
<p>Spacecraft trajectory optimization is a near-infinite problem space with a wide variety of models and optimizers. As trajectory complexity increases, so too must the capabilities of modern optimizers. Common objective cost functions for these optimizers include the propellant utilized by the …
-
Global Optimization of MGA-DSM Problems Using the Interplanetary Gravity Assist Trajectory Optimizer (IGATO)
<p>Interplanetary multiple gravity assist (MGA) trajectory optimization has long been a field of interest to space scientists and engineers. Gravity assist maneuvers alter a spacecraft's velocity vector and potentially allow spacecraft to achieve changes in velocity which would otherwise be …
-
Validated global multiobjective optimization of trajectories in nonlinear dynamical systems
… error, our resulting method is the first global trajectory optimization method that can reliably handle nonconvex nonlinear dynamical systems with substantial instabilities, such as the notoriously ill-behaved multi-body gravitational systems governing interplanetary space trajectories. Rigorous …