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 21 for “"FlyBy"”.
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Pluto fast flyby spacecraft design and development
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1994.
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Automated trajectory planning for multiple-flyby interplanetary missions
… 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 directions of thrust, flyby altitudes, etc. The contribution of this work is a framework for the autonomous optimization of …
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Interplanetary trajectory analysis for 2020-2040 Mars missions including Venus flyby opportunities
… 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 developed in this work, we investigate the relation …
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Modeling Ganymede's Interaction with the Jovian Magnetosphere: Ionospheric Outflow and the Juno PJ34 Flyby
… and magnetic field observations from Juno's PJ34 flyby of Ganymede on 07 June 2021. Using five model configurations that successively increase the complexity of Ganymede’s atmosphere and ionosphere through the inclusion of additional particle species and ionization mechanisms, we examine the …
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Orbital Optimization of Interplanetary Trajectories with Environmental Perturbations
… trajectory from planet to planet, and a flyby section was created for the hyperbolic gravity assist trajectories. A cost function was then used to evaluate the best combination of Delta V, time of flight, synodcity, flyby altitude, and heliocentric energy. This work is primarily concerned …
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Modeling Pluto's light curve in the near infrared : implications for observation post new horizons
… were gathered one month before the New Horizons flyby in order to compare ground-based observing with spacecraft data. Furthermore, a model was created in order to predict how volatile transport will affect ground-based observations in the future. The near-infrared data show large scale surface …
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Interplanetary Ridesharing: Exploring Potential CubeSat Trajectories
… the CubeSat deployer. These categories are flyby, orbiter, and lander. For each category the objective function starts with four design variables. These are the ΔV of the deployer broken up into three component directions and the true anomaly at the time of deployment. The method then …
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Interstellar Mission Design of a Fusion-Powered Spacecraft to Proxima b
… performance was examined for a fast and slow flyby of Proxima b, and bounded orbit. The analysis indicated a slow flyby and bounded orbit are most ideal for data collection, and can only be supported by the FDR employing D-He3 with a mission time of 57 years. Future work includes the …
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Gravity-assist trajectories to Venus, Mars, and the ice giants: Mission design with human and robotic applications
… flight times for application to near-term human flyby missions (similar to that of Inspiration Mars). Venus free-returns are also investigated and proposed as an alternative to a human Mars flyby mission. Attractive Earth-Mars free-return opportunities are identified that use an intermediate …
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Machine learning-aided trajectory optimization and tour design
… bottleneck. Meanwhile, the number of possible flyby sequences grows combinatorially as the number of flybys increases, and each sequence is associated with a distinct cost function topology, making optimization and trade-space exploration especially challenging. To address these issues, this …
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Uranus orbiter and probe mission : Project Upsilon
… 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 rotating Uranus. The statistical estimation method combines an orbit determination model with respect to …
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Automated planetary satellite tour planning with a novel low-thrust direct transcription method
… challenging aspects to the design of multiple flyby, low-thrust trajectories. One of the most significant, from the point of view of a numerical optimizer, can be the characteristic time scale of the dynamical system. Trajectories in a setting with a short characteristic time scale (e.g. those …
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Highly Physical Solar Radiation Pressure Modeling During Penumbra Transitions
… applied to a study of penumbra SRP and the Earth flyby anomaly. Beyond the value of its results to the scientific community, this study provides an application example where the computational efficiency of the simplified SOLAARS-CF model is necessary. The Earth flyby anomaly is an open question in …
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Design of low-thrust missions to asteroids with analysis of the missed-thrust problem
… should feature a coast arc leading up to the flyby. If not, the mission may be lost if a missed-thrust event occurs during a thrust arc prior to the gravity assist.</p>
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Spacecraft Trajectory Optimization Suite: Fly-Bys with Impulsive Thrust Engines (Stops-Flite)
… requires the modeling of these “powered flybys” or “powered gravity assists” (PGAs) within an interplanetary trajectory optimizer. This paper will discuss the use and modification of the Spacecraft Trajectory Optimization Suite, an optimizer built on evolutionary algorithms and the island …
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High Frequency Radio Wave Transionospheric Propagation Polarization Studies from the RRI-SuperDARN Experiment
… Radar Network) radar in conjunction with RRI flybys. There have been 88 conjunctions between RRI and SuperDARN over 4 years (2014-2018). The changing polarization state of the radar signal as it propagates through the ionosphere, transionospheric propagation, is the scientific focus of this …
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Interplanetary Transfer Trajectories Using the Invariant Manifolds of Halo Orbits
… insertion about the destination planet or flyby trajectories to get to another planet. This work uses this method of dynamics to test transfers from Earth to both Jupiter and Saturn, and compares delta-v and time of flight values to traditional transfer methods. Using the CRTBP can lead to …
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Robust preliminary design for multiple gravity assist spacecraft trajectories
… transcription, are combined with a parallelized flyby tree path finding algorithm to produce a design framework capable of autonomously optimizing a moon tour mission similar to Galileo from launch through tour end using two-body dynamics.
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Spacecraft trajectory optimization using many embedded Lambert problems
… extensively used in primer vector theory, flyby-tour design, direct impulsive-maneuver optimization, and more. Lack of fast and accurate BVP solvers has prevented the use of the EBVP technique on problems with more than dozens of segments. For the two-body problem, a recently-developed …
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Interplanetary Trajectory Optimization with Automated Fly-By Sequences
<p>Critical aspects of spacecraft missions, such as component organization, control algorithms, and trajectories, can be optimized using a variety of algorithms or solvers. Each solver has intrinsic strengths and weaknesses when applied to a given optimization problem. One way to mitigate …
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