Topic
Propulsion
About: Propulsion is a research topic. Over the lifetime, 24977 publications have been published within this topic receiving 200311 citations.
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TL;DR: A model based on artificial neural network algorithms was built to detect unbalanced blades in a UAV propeller and showed high accuracy, indicating a high number of correct detections and suggests the adoption of this tool to verify the operating conditions of a Uav.
84 citations
Patent•
13 Sep 2011
TL;DR: In this paper, additively manufacturing a casing body into a single-piece structure having no bonded or bolted joints is described. But the casing body defines a combustion chamber therein and is at least partially composed of a material useful as a solid rocket fuel and capable of being consumed during combustion.
Abstract: Propulsion systems and method for making a propulsion system include additively manufacturing a casing body into a single-piece structure having no bonded or bolted joints. The casing body defines a combustion chamber therein and is at least partially composed of a material useful as a solid rocket fuel and capable of being consumed during combustion. Other embodiments are also described.
84 citations
TL;DR: A time-dependent thrust model was developed, which predicted the thruster dynamics as a function of time, actuation frequency, and thruster-driving parameters, which led to maneuver categorization into three regimes: Cruising, Docking, and Transition.
Abstract: A new type of underwater thruster was designed to provide high-accuracy, low-speed maneuvering to underwater robots. Located internal to the vehicle surface, these thrusters have a minimal effect on the forward-drag profile of the vehicle. These thrusters, whose inspiration comes from the natural propulsion of cephalopods and jellyfish, generate control forces by successive ingestion and expulsion of jets of water from a cavity mounted in the hull of the vehicle. The jetting process has no net mass flux but results in a positive momentum flux. A time-dependent thrust model was developed, which predicted the thruster dynamics as a function of time, actuation frequency, and thruster-driving parameters. A linear transfer-function model was developed to approximate both the thruster and vehicle dynamics, which led to maneuver categorization into three regimes: Cruising, Docking, and Transition. The predicted frequency response was verified through hybrid simulation to be accurate for predicting general trends and cutoff frequency.
84 citations
TL;DR: In this paper, a solar sail magnetotail mission concept was examined and a detailed tradeoff as to the effect of spacecraft and sail technology levels, and requirements, on sail size was presented for the first time.
Abstract: In this paper a solar sail magnetotail mission concept was examined. The 43-m square solar sail is used to providethe required propulsion for continuous sun-synchronous apse-line precession. The main driver in this mission was found to be the reduction of launch mass and mission cost while enabling a nominal duration of 2 years within the framework of a demonstration mission. It was found that the mission concept provided an excellent solar sail technology demonstration option. The baseline science objectives and engineering goals were addressed, and mission analysis for solar sail, electric, and chemical propulsion performed. Detailed subsystems were defined for each propulsion system and it was found that the optimum propulsion system is solar sailing. A detailed tradeoff as to the effect of spacecraft and sail technology levels, and requirements, on sail size is presented for the first time. The effect of, for example, data acquisition rate and RF output power on sail size is presented, in which it is found that neither have a significant effect. The key sail technology requirements have been identified through a parametric analysis.
84 citations
TL;DR: In this article, the effects of variable geometry on the part-load performance of a two-shaft aero-derivative gas turbine and a singleshaft industrial configuration were investigated.
83 citations