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 177 for “"propulsive"”.
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Propulsive performance of flexible-chord foils
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2002.
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Propulsive Battery Packs Sizing for Aviation Applications
… thesis derives analytical methods for sizing the propulsive battery packs for designing an electric-driven aircraft. Lithium-Ion (Li-Ion) battery is the primary choice of battery cell chemistry in this thesis research due to its superior specific energy and market availability. The characteristics …
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Experimental evaluation of a propulsive wing concept
… LEARN project which aimed to develop a novel propulsive wing airfoil section which could be applied to a future-generation high-efficiency aircraft in order to further improve gains in efficiency over current aircraft. The designed airfoil section extended the Griffith/Goldschmied airfoil …
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Aviation Propulsive Lithium-Ion Battery Packs State-of-Charge and State-of-Health Estimations and Propulsive Battery System Weight Analysis
<p>Aviation propulsive battery pack research is in high demand with the development of electric and hybrid aircraft. Accurate inflight state-of-charge and state-of-health estimations of aviation battery packs still remain challenging. This thesis puts efforts on estimating the state-of-charge, …
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Propulsive efficiency of a flexible hull underwater vehicle
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1996.
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The role of flexibility on propulsive performance of flapping fins
… fish modulates its fin stiffness to optimize the propulsive performance. Inspired by the stiffness modulation of fish fins, the objective of this research is to predict and evaluate the effect of flexibility on propulsive performance of flapping fins. The stiffness of the fins vary along their …
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Analysis and design of propulsive guidance for atmospheric skip entry trajectories
A study of the ability to use propulsive guidance for atmospheric skip entry trajectories was completed. The analysis centered itself around the proposed design of NASA's Crew Exploration Vehicle. The primary aerodynamic guidance system must execute an atmospheric skip maneuver when attempting to …
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The Propulsive Design Aspects on the World’s First Direct Drive Hybrid Airplane
<p>The purpose of this thesis is to design a safe technology demonstrator by implementing a direct drive propulsion system for a gas-electric hybrid aircraft. This system was integrated on the Embry-Riddle Eco-Eagle for the Green Flight Challenge 2011. The aim of the system is to allow the pilot to …
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Noise And Propulsive Efficiency Interactions For Rotors And Propellers At Constant Thrust
… particulate emissions while also having enough propulsive efficiency to complete the mission. This thesis aims to study the relationship between noise and propulsive efficiency as related to any aircraft equipped with an electric motor and a variable pitch rotor/propeller. The combination of the …
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The effects of aero-propulsive coupling on aircraft with distributed propulsion systems
… at Urbana-Champaign to characterize the aeropropulsive coupling effects which are present for aircraft equipped with distributed electric propulsion (DEP) systems consisting of over-wing trailing-edge mounted (OWTE) arrays of ducted fans, and to identify the influence of those effects on …
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Propulsive and logistical feasibility of alternative future human-robotic Mars exploration architectures
This thesis extends the work on a shared human and robotic mission to the Martian system presented at the Revolutionary Aerospace Systems Concepts Academic Linkage (RASC-AL) 2010 competition by a team of MIT graduate students. Particular attention is paid to the transportation infrastructure and …
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Aero-propulsive characteristics of an overwing distributed electric propulsion system with vectored thrust
A series of experiments were conducted on a quasi-2D S8036 airfoil with a distributed electric propulsion (DEP) system. An overwing ducted fan system was tested with varied thrust angles achieved by deflecting the fan exit flow direction. The DEP system was comprised of five electric fans mounted …
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Advances in Aero-Propulsive Modeling for Fixed-Wing and eVTOL Aircraft Using Experimental Data
… identification applications, including: aero-propulsive model development for propeller aircraft and nonlinear dynamic model identification without mass properties. The second part of the dissertation builds on established fixed-wing and rotary-wing aircraft system identification methods to …
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Effects of Aero-Propulsive Interactions for Various Wing Integration Techniques on Electric Ducted Fan Performance
This study explores the aero-propulsive coupling effects of wing blended electric ducted fans (EDF) lifting systems over the EDF unit. Wing blended EDFs and isolated EDF are on the rise as a solution to increase efficiency on regional mobility platforms. Electrification of platforms has permitted …
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Experimental and computational investigation of the transonic aero-propulsive interactions of an overwing ducted fan
The student, Matthew Lauer, submitted this Thesis for approval on 2021-04-21 at 15:17.
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Comparative Evaluation of Propulsive Power Transmission Technologies for High-Speed Vertical Takeoff and Landing (HSVTOL) Cargo Aircraft
… insights into the strengths and limitations of propulsive power traditional and advanced transmission for HSVTOL aircraft. Additionally, the study provides a comprehensive methodology for transmission sizing and weight estimation, ultimately revealing the most suitable transmission type for …
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A computational and experimental investigation of the propulsive and lifting characteristics of oscillating airfoils and airfoil combinations in incompressible flow
Computational and experimental methods have been used to systematically study one and two airfoils undergoing unsteady motion. first, a single airfoil analysis with the modified computer code, U2DIFF. thrust, efficiency, and phase relationships were computed and compared to existing theoretical …
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Propulsion By Sinusoidal Locomotion: A Motion Inspired By Caenorhabditis Elegans
… the motion, we have derived the closed forms of propulsive force, lift and other generalized forces applying on the wing. We also calculated the power required to perform the motion, the power lost due to the shed vortices and the propulsive efficiency. These forces and powers are given as …
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Analysis of Multiple Degree-of-freedom Oscillatory Aquatic Propulsion
<p>Propulsive performance and flow field data were experimentally measured for a two degree-of-freedom fish platform. The fish platform was designed and constructed based on the yellowfin tuna (\textit{Thunnus albacares}) that is known to be both fast and efficient. This work extends the current …
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