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 44 for “"Trajectory Design"”.
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Optimal trajectory design under uncertainty
Reference trajectory design for atmospheric reentry vehicles can be accomplished through trajectory optimization using optimal control techniques. However, this method generally focuses on nominal vehicle performance and does not include robustness considerations during trajectory design. This …
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Biped walking trajectory design and stabilization
… the linear inverted pendulum model (LIPM), to design a dynamically stable trajectory for the biped robot, based on given gaits. Two different approaches will be used for the trajectory generation: boundedness constraint and linear-quadratic-regulator method. Both of these methods compute the …
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Orbital Maneuvers and Interplanetary Trajectory Design via Reinforcement Learning
… of reinforcement learning (RL) to the design and optimization of low-thrust spacecraft trajectories, with an emphasis on autonomy, adaptability, and robustness in the presence of system uncertainties and unmodeled perturbations. Classical approaches to low-thrust trajectory design are …
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Trajectory design and control for formation flying spaceborne interferometers
… that trade imaging metrics for spacecraft design metrics such as mission length and spacecraft mass are addressed. The determination of optimal spacecraft locations or trajectories for image acquisition is studied to satisfy astronomical constraints. These positioning requirements lead to …
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Trajectory design and analysis of a Mars-orbit rendezvous flight experiment
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2003.
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Hybrid-optimization scheme for low-thrust trajectory design to the lunar gateway
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-12-01
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Spacecraft trajectory design utilizing resonance orbits in a hybrid optimal control framework
Low-energy trajectories are a growing subset of trajectory design, particularly in the three-body space. These trajectories use the inherent stability and instability of certain orbits as a means of fuel efficient transfers. Traditionally, work on these types of trajectories has taken a very “hands …
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Real-time trajectory design for unmanned aerial vehicles using receding horizontal control
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2003.
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Mechanical and trajectory design of wearable Supernumerary Robotic Limbs for crutch use
… paper first details the mechanical and material design choices that drastically reduced the weight of this SRL prototype, including advanced composite materials, efficient joint structure, and high-performance pneumatic actuators. The latter half of this paper characterizes the biomechanics of …
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The propulsion and trajectory design for the energetic transient array astrophysics mission
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1997.
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Trajectory design for solar sailing from low-Earth orbit to the Moon
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1992.
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Autonomous optimal trajectory design employing convex optimization for powered descent on an asteroid
… The problem under 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 …
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Trajectory design and vehicle guidance for a mid-air rendezvous between tow autonomous aircraft
… to achieve this goal are discussed. First, the design of the trajectory, to be followed by the chasing aircraft, is presented. Then, several options for the guidance of the vehicles are explored and the adaptation of Proportional Navigation for PCUAV is discussed. Finally, the synchronization …
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Trajectory design in the spatial circular restricted three-body problem exploiting higher-dimensional Poincare maps
… higher-dimensional Poincaré maps in facilitating trajectory design is explored for a variety of applications. To begin, existing strategies to implement Poincaré maps for trajectory design applications in the spatial CR3BP are evaluated. New applications for these strategies are explored, …
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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
In the trajectory design process, gravitational interaction between the bodies of interest plays a key role in developing the over-arching force model. However, non-gravitational forces, such as solar radiation pressure (SRP), can significantly influence the motion of a spacecraft. Incorporating …
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Design of transfers from Earth-Moon L 1/L2 libration point orbits to a destination object
… Earth-Moon system is complex and, consequently, trajectory design in the vicinity of Earth-Moon L1 and L2 is nontrivial. Routine transfers between an Earth-Moon L1/L2 facility and Mars also requires design strategies to deliver trajectory arcs that are characterized by a coupling between …
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Robust preliminary design for multiple gravity assist spacecraft trajectories
The development of a new spacecraft trajectory design method most often occurs because a particular capability does not exist. The invention is usually considered successful so long as it is capable of producing solutions to the problem in question, and thus satisfies a particular design …
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Optimal trajectory-shaping with sensitivity and covariance techniques
Traditional trajectory design approaches apply optimal control techniques to maximize desired performance, subject to specified constraints. Normal metrics and constraints are composed of the deterministic states and controls in the plant dynamics, so classical design methods do not directly …
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Reconfigurable intelligent surface and UAV-assisted communications: a deep reinforcement learning approach
… several real-life applications including UAV's trajectory design, power allocation, data collection, wireless power transfer and RIS's phase shift matrix adjustment.<br/><br/>The thesis presents three major contributions. Firstly, we design a new UAV-assisted Internet-of -things (IoT) system …
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Automated trajectory planning for multiple-flyby interplanetary missions
… 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 directions of …
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