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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 26 for “"High thrust"”.
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High thrust optimization through Hamilton-Jacobi theory.
Massachusetts Institute of Technology. Dept. of Aeronautics and Astronautics. Thesis. 1966. M.S.
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Space logistics network optimization with embedded propulsion technology selection
… use of emerging technologies, such as low-thrust solar electric propulsion, along with existing space exploration technologies. Trajectory analysis plays a key role in deciding the costs of using different propulsion technologies. Traditional trajectory design methods are usually confined …
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A numerical investigation into the tactical advantages of supercruise for combat aircraft
… is provided which illustrates the trend towards high thrust to weight ratio aircraft engines with lower fuel consumption.
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Spaceborne centrifugal relays for spacecraft propulsion
… for the acceleration of spaceborne payloads to high velocity at high thrust. Centrifugal relays are moving rotors which progressively accelerate reaction mass to higher velocities. One important engineering problem consists of accurately tracking the position of the projectiles and rotors and …
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Thrust measurement of the busek bht 20 microhall effect thruster
… results of testing a low power micro-hall effect thruster suitable for various mission objectives such as orbital maneuvers, momentum dumping, and precision pointing for microsatellites. The BHT 20 is a low power micro-hall effect thruster capable of generating thrust at the µN thrust level. The …
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Propulsion mechanisms in a helicon plasma thruster
Electric thrusters offer an attractive option for various in-space propulsion tasks due to their high thrust efficiencies. The performance characteristics of a compact electric thruster utilizing a helicon plasma source is investigated with the goal of identifying potential thrust mechanisms. …
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Design and control of an high maneuverability remotely operated vehicle with multi-degree of freedom thrusters
… < lm³, < 1Okg, low cost, unmanned submersible. High maneuverability in the ROV as achieved through a high thrust-to- mass ratio in all directions. One identified solution is moving the primary thrusters in both the pitch and yaw directions. The robot is propelled by a pair of 2 DOF thrusters, …
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Reliability and validity of selected pain provocation tests at the sacroiliac joint
… of inter examiner agreement occurred using the high thrust and Faber test (k=0.674 0.611 respectively). This minor thesis was written by a post-graduate student as part of the requirements of the Master of Health Science (Osteopathy) program.
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Force and hydrodynamic efficiency measurements of a three-dimensional flapping foil
… have shown that it is an efficient and high thrust means of propulsion. Extensive work has been done to optimize the efficiency of two-dimensional flapping foils, varying both the kinematics of the motion and the flexibility of the foil. However, no thorough investigation into the …
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Hybrid Chemical-Electric Propulsion Systems for CubeSats
… Chemical propulsion systems benefit from high thrust to perform impulsive maneuvers but have a low specific impulse. On the other hand, electric propulsion systems have a much lower thrust but a high specific impulse, thus resulting in large delta-v budgets. While common for larger …
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Effect of Reynolds Number and Geometry on the Undulatory Hydrodynamics of Tapered Elastic Plates
… and traveling wave oscillation modes can produce high thrust, traveling waves achieve significantly higher hydrodynamic efficiency, and this advantage is more pronounced at higher Reynolds numbers. Regardless of the oscillation mode, tapering leads to greater hydrodynamic performance. Furthermore, …
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Hydrodynamic performance and vortex shedding of a biologically inspired three-dimensional flapping foil
… yet marine pulsars inspired by examples of highly maneuverable marine life or aquatic birds remain unheard of. The motivation of this research stems from the notion that better propulsive strategies could be obtained from flapping foils; presenting superior alternatives to the conventional …
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Propeller design optimization for tunnel bow thrusters in the bollard pull condition
Tunnel bow thrusters are often used by large ships to provide low-speed lateral maneuverability when docking. Required to provide high thrust while essentially at a standstill, the design point for these thrusters is the bollard pull condition. Traditionally, the term bollard pull refers to the …
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Agile flight control techniques for a fixed-wing aircraft
… reconnaissance. Fixed-wing vehicles with a high thrust-to-weight ratio are capable of performing maneuvers such as take-off or perch style landing and switch between hover and conventional flight modes. Agile flight controllers enable a single vehicle to achieve multiple mission objectives. …
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Design of a Bimodal Chemical-Electrospray Propulsion System using Ionic Liquid Monopropellants
… gas, solid propellant) and electric (e.g. Hall thruster, ion engine, electrospray). Chemical propulsion typically offers high thrust and low specific impulse, while electric propulsion provides the inverse of low thrust and high specific impulse. As such, having access to both of these modes on …
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An Improved Prescribed Wake Analysis for Wind Turbine Rotors
… to this is when the rotor is operating under a high thrust loading condition. The tip vortices will then propagate radially at a rate equal to 0.024 nondimensional radial units per radian of rotation until the following blade passes. At that time, the rate decreases to 0.010. Three tests were …
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Continuous Low-Thrust Trajectory Optimization: Techniques and Applications
… mission feasibility during mission design. High-thrust trajectory optimization problems are typically formulated as discrete optimization problems and are numerically well-behaved. Low-thrust systems, on the other hand, operate for significant periods of the mission time. As a result, the …
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Multi-body Dynamics Simulation and Analysis of Wave-adaptive Modular Vessels
Catamarans provide vast deck space, high thrust efficiency, and excellent transverse stability, however, in rough conditions they can be susceptible to deck slamming from head seas or bow diving in following seas and a pitch-roll coupling effect that can lead to uncomfortable corkscrew motion under …
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Variable reluctance motor airgap geometry for maximizing force production: a data analysis approach using finite element generated characteristics
… a narrower range of tooth widths for both high thrust and low force ripple applications. The study introduces tooth fillet parameters; specific values of these further increase LVR output thrust, and the data shows which range of tooth fillets maximize thrust. Three salient applications of …
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Experimental Investigation of Wind Loading on a Ducted Wind Turbine
… turbines. For the present configuration with the high thrust loading, the drag on the disc contributes to more than 70% of the total drag in low turbulence case. A detailed study on the surface pressure measurements of the loaded duct reveals separation at the leading edge of the duct’s outer …
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