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 “"Fuel optimal"”.
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Fuel optimal rendezvous including a radial constraint
Fuel-optimal rendezvous in orbit is examined using thrust-impulses and coasting arcs. Necessary conditions for the optimality of fuel-optimal rendezvous with and without radial constraints are derived. These conditions are then used to verify the optimality of trajectories obtained from a …
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A nonlinear control algorithm for fuel optimal attitude control using reaction jets
… analysis and design of a weighted nonlinear time-fuel optimal control algorithm for spacecraft attitude dynamics using on-off gas jets. In the development of a controller, we explore four control algorithms within a single-step control framework where the step is the fundamental update time of the …
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Fuel-optimal space-flight transfer solutions through a redundant adjoint variable transformation
… be very beneficial when it is applied to minimum-fuel space rendezvous and intercept problems. It facilitates using attributes from the two systems simultaneously; a new necessary condition in Schumacher adjoints is derived in this dissertation, and this together with classical necessary …
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Fuel optimal control of second and third-order linear systems with different time constraints
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1963.
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A six degree of freedom, plume-fuel optimal trajectory planner for spacecraft proximity operations using an A* node search
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1994.
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Optimal finite-thrust Trans-Earth Injection (TEI) maneuvers for a Low Lunar Orbit (LLO) earth return mission
… used to efficiently solve complex, non-linear optimal control problems and can be used to develop rapid and robust control solutions in astrodynamics applications. With the renewed efforts in resuming future manned missions to the moon or near-earth asteroids, fuel optimal flight trajectories …
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Integral Quadratic Constraints and Safety Certificates for Uncertainty Characterization and Control Safety-Aware Filtering of Proximity Operations Between Satellites
… to provide safety-aware filtering for the fuel-optimal control policies. A linear quadratic regulator controller for a servicer satellite (Servicer) is analyzed via the dissipativity inequality principle and quadratic constraints. This method allows the capture of unmodeled dynamics to …
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Optimal orbit transfers for satellite formation flying applications
… an algorithm for finding a multi-impulse, fuel-optimal trajectory, based on relative motion dynamics, and the necessary conditions from the Pontryagin Maximal Principle. Second, the dissertation derived sufficient conditions, verifying the optimality of the impulsive trajectories obtained …
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Participatory sensing fuel-efficient navigation system GreenGPS
… GreenGPS is a navigation service that finds fuel optimal routes, customized to individual drivers and vehicles, between arbitrary end-points. This thesis studies research challenges revealed in development of GreenGPS on how to build an easy-to-deploy and inexpensive participatory sensing …
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Lossless convexification of quadrotor motion planning with experiments
… position constraints. Using the convexied optimal trajectory generation problem with physical and path constraints, an algorithm is developed that generates fuel optimal trajectories given the initial state and desired final state. As a proof of concept, a quadrotor testbed is developed …
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Design and control of microsatellite clusters for tracking missions
… the following: orbit determination using optimal measurement principles, cluster design heuristics and fuel optimal cluster maintenance. These are all evaluated on a high-fidelity simulation testbed. First, the orbital determination approach utilizes optimal measurement principles to …
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Evaluating Fuel-Climate Tradeoffs in Contrail Avoidance
… Contrail avoidance strategies will result in fuel burn penalties and, consequently, additional climate warming from carbon dioxide emissions; therefore, the climate benefit from avoiding contrails must be evaluated against the carbon dioxide penalties. Prior work has estimated the fuel burn …
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Parameter optimization of atmospheric skip trajectories for use in minimum fuel usage transfer orbits
… the complexity of the desired skip trajectory. Fuel optimal transfer orbits are obtained using the generalized impulse along with Keplerian arcs and instantaneous changes in velocity. Families of coplanar and noncoplanar transfers for circular orbit to circular orbit are numerically generated. …
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Full efficiency benefits and implementation considerations for cruise altitude and speed optimization in the National Airspace system
This study examines the potential fuel burn benefits of altitude and speed optimization in the cruise phase of flight for domestic airlines in the United States. Airlines can achieve cost reductions and reduce environmental impact by making small modifications to the cruise phase operating …
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Towards Autonomy: Leveraging Nonlinearity In Predictive And Convex Optimization For Space Vehicle Guidance And Control
… that are efficient in both computation time and fuel use. In the cislunar environment, a nonlinear optimization approach combines two-point boundary value problem solutions with an MPC-inspired method, which produces feasible and fuel-efficient trajectories under the three-body dynamics while …
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A vision based control system for autonomous rendezvous and capture of a Mars Orbital Sample
… Predictive controller design is proposed for the fuel-optimal capture of the OS. Implementation and testing of the controller in the SPHERES satellite is presented and the comparisons to the SPHERES PD control system are revealed to highlight its strengths.
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Autonomous optimal trajectory design employing convex optimization for powered descent on an asteroid
… investigation is how to design a propellant (fuel) optimal powered descent trajectory that can be quickly computed onboard the spacecraft, without interaction from ground control. The goal is to autonomously design the optimal powered descent trajectory onboard the spacecraft immediately prior …
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Optimal docking to tumbling objects with uncertain properties
… docking port) with the tumbling motion. Using a fuel-efficient trajectory, it traverses along the docking port's body-fixed approach axis by creating the requisite tangential and radial accelerations associated with the Target's tumble. Finally, the Chaser docks with a sufficiently low impact …
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Optimization-Based Guidance for Satellite Relative Motion
… We present solutions to several types of optimal orbital maneuvers using a variety of different, realistic assumptions based on the maneuver objectives. Initially, we assume a perfectly circular orbit with a perfectly spherical Earth and analytically solve the under-actuated, …
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Field Evaluation of the Eco-Cooperative Adaptive Cruise Control in the Vicinity of Signalized Intersections
… response to these signals causes an increase in fuel consumption and air emission levels. One solution to this problem is Eco-Cooperative Adaptive Cruise Control (Eco-CACC), which attempts to reduce vehicle fuel consumption and emission levels by optimizing driver behavior in the vicinity of a …
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