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 9 of 9 for “"constant thrust"”.
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Nonlinear feedback solution for minimum-time intercept with constant thrust acceleration.
Massachusetts Institute of Technology. Dept. of Aeronautics and Astronautics. Thesis. 1966. M.S.
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Noise And Propulsive Efficiency Interactions For Rotors And Propellers At Constant Thrust
… This feature allows the rotor/propeller to hold constant thrust at different combinations of rotational speeds and torque, by adjusting the collective pitch of the blades. This research will show that, for a rotor at constant thrust, the minimum noise (from loading and thickness contributions) …
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A study of the range of validity for the method of Kryloff and Bogoliuboff as applied to a satellite in motion with a specified constant thrust
… to the problem of a satellite with a small constant thrust and under the influence of a central force field presents difficulties due to equations non-linearity. An investigation was made to determine what range of values of the thrust parameter could be utilized to obtain a valid …
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Optimal Electrodynamic Tether Phasing and Orbit-Raising Maneuvers
… uses a Lorentz force to provide propellantless thrust. We develop the optimal equations of motion using Pontryagin's Minimum Principle. We find numerical solutions using a global, stochastic optimization method called Adaptive Simulated Annealing. The method uses Markov chains and the system's …
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Battery Centric Serial Hybrid Aircraft Performance and Design Space
… to be able to control efficiency and noise at constant thrust and therefore constant airspeed. Manufacturer provided electric motor and propeller data is used for efficiency purposes. Since the electric motor is virtually silent compared to the propeller, published noise evaluation methods are …
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Spacecraft Trajectory Optimization Suite (STOPS): Optimization of Low-Thrust Interplanetary Spacecraft Trajectories Using Modern Optimization Techniques
… State University, San Luis Obispo. Low-thrust spacecraft engines are becoming much more common due to their high efficiency, especially for interplanetary trajectories. The version of STOpS presented here optimizes low-thrust trajectories using the Island Model Paradigm with three …
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Applications of Second-Order Necessary and Sufficient Conditions to Optimal Trajectories
… including spacecraft trajectory problems with constant thrust acceleration and with time-varying low thrust acceleration for a power-limited rocket engine. A solution that simultaneously maximizes final orbit energy and minimizes propellant consumption is found that satisfies the usual …
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An experimental study on the performance of existing and custom quiet propeller designs for unmanned aircraft systems
… of a UAV propulsion system by up to 50% at a constant thrust and a minimum increase in consumed power by only 8.5%. The full version of this thesis will be uploaded onto the Defense Technical Information Center (DTIC). For more information please contact Dr. Travis Fields at fieldstd@umkc.edu.
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Low thrust augmented periodic orbits in the two- and three-body problems
Continuous low thrust propulsion can add considerable utility to spacecraft dynamics by enabling rich new families of thrust augmented orbits. With the aim of enabling such orbits for small, low-cost spacecraft with limited on-board sensing, new families of non-Keplerian orbits are generated in the …