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Browse College of Engineering by Contributor "Conway, Bruce A."
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(2009)A modern space mission is assembled from multiple phases or events such as impulsive maneuvers, coast arcs, thrust arcs and planetary flybys. Traditionally, a mission planner would resort to intuition and experience to ...
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(20130524)Upon completion of the heliocentric leg of its 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 ...
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(20130524)Many space mission planning problems may be formulated as hybrid optimal control problems (HOCP), i.e. problems that include both realvalued variables and categorical variables. In interplanetary trajectory design problems ...
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(2002)This research successfully develops a new numerical method for the problem of twosided flight path optimization, that is, a method capable of finding trajectories satisfying the necessary condition of an openloop ...
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(20150420)There has been considerable interest in formation flying spacecraft due to their potential to perform certain tasks at a cheaper cost than monolithic spacecraft. Formation flying enables the use of smaller, cheaper spacecraft ...
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(20130524)The goal of this thesis is to identify potential NearEarth Asteroids (NEAs) that are viable candidates for human exploration. The computational method incorporated to help identify these targets is the particle swarm ...
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(1995)Improved collocation methods for the solution of a set of ordinary differential equations are developed and used to solve minimumtime, Earthmoon orbit transfers. These collocation methods are based on a family of modified ...
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(2005)An improved collocation method is developed for a class of problems that is intractable, or nearly so, by conventional collocation. These are problems in which there are two distinct timescales of the system states, that ...
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(20140116)Inverse optimal control is the problem of computing a cost function with respect to which observed state input trajectories are optimal. We present a new method of inverse optimal control based on minimizing the extent to ...
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(20130822)Small CubeSatclass satellites are opening up new avenues for science and technology development within the space industry. What was once a purely educational tool has quickly become the newest international exploration ...
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Neighboring Optimal Feedback Control for Trajectories Found by Collocation and Nonlinear Programming (1997)On August 9, 1995, because of a launch vehicle failure the Koreasat 1 satellite was placed into an orbit that was 3,400 nautical miles (6,351 km) lower than the planned geostationary transfer orbit. The LockheedMartin ...
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(20140116)The topic of the first part of this research is trajectory optimization of dynamical systems via computational swarm intelligence. Particle swarm optimization is a natureinspired heuristic search method that relies on a ...
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(20110825)New methods to solve trajectory optimization problems are devised. The methods use direct transcription to convert the continuous optimal control problem into a parameter optimization problem that can be solved with ...
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(1991)A method has been developed for determining optimal, i.e. minimum fuel, trajectories for the fixedtime cooperative rendezvous of two spacecraft. The method assumes that the vehicles perform a minimum of three impulsive ...
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Optimal finitethrust spacecraft trajectories using direct transcription and nonlinear programming (1991)A class of methods for the numerical solution of optimal control problems is analyzed and applied to the optimization of finitethrust spacecraft trajectories. These methods use discrete approximations to the state and ...
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(20130524)The pursuit/evasion game for two spacecraft is significantly simplified by being described with a linearized system of equations of motion. A pursuit/evasion game is also known as a “minimax” problem, because the objective ...
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(20140916)The goal of this thesis is to demonstrate the applicability of the discrimination time optimization problem to space systems. The concept is applied to an asteroid interception problem using lowthrust propulsion and solved ...
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(20110525)Satellite clusters are a useful tool to improve mission costeffectiveness and redundancy, but controlling the satellites within the cluster is a difficult task. The particle swarm evolutionary algorithm is used to find ...
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(20180710)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 ...
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(20181206)Establishing longterm human presence beyond low Earthorbit will require cooperative use of emerging technologies, such as lowthrust solar electric propulsion, along with existing space exploration technologies. Trajectory ...
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Now showing items 120 of 20