Browsing Aeronautics and astronautics by Title
Now showing items 4059 of 93

Feasibility of a WindPropelled Spar Buoy for Use as a Meteorological Observation Platform in Hurricane Conditions
A novel vehicle concept is introduced and its feasibility as an autonomous, selfpropelled weather buoy for use in violent storm systems is analyzed. The vehicle concept is a spar sailboat  consisting of only a deep keel ... 
Finite element analysis of propagating interface cracks in composites
(1986)A complex variable formulation has been developed to describe the nearfield state of stresses and displacements for a propagating crack along the interface of two dissimilar anisotropic materials. It is shown that the ... 
Flame Structure and Emissions of StronglyPulsed Turbulent Diffusion Flames with Swirl
(20120810)This work studies the turbulent flame structure, the reactionzone structure and the exhaust emissions of stronglypulsed, nonpremixed flames with coflow swirl. The fuel injection is controlled by stronglypulsing the ... 
Fluid dynamics of the shock wave reactor
(2000)High commercial incentives have driven conventional olefin production technologies to near their material limits, leaving the possibility of further efficiency improvements only in the development of entirely new techniques. ... 
Generating Detonation Waves in an Annulus via Phased Adiabatic Shocks
This thesis documents the design and development of a continuous rotating detonation combustor. The design of the combustor incorporates a new system to initiate and control detonation waves within an annular duct. This ... 
Heat Transfer and Convective Structure of Evaporating Films under PressureModulated Conditions
This work examines the fluid mechanical and heat transfer characteristics of evaporating films under cyclical superheat conditions. This research was motivated by the need to further understand the instability drivers in ... 
Implementation of 3DPTV for turbulence analysis and subgridscale stress model testing of a backwardfacing step flow
LargeEddy Simulation (LES) is a constantlyexpanding field with many new applications and models being introduced on a regular basis. The active nature of this field establishes the need for highresolution, 3dimensional ... 
Interaction of an accelerated FRC in a transverse magnetic field
(1998)The interaction and penetration of an accelerated FRC into a transverse magnetic field is studied for Tokamak refueling purposes. FRC penetration and interaction in the transverse magnetic field chamber is observed using ... 
Investigating plasma viscosity with fast framing photography in the ZaPHD Flow ZPinch experiment
The ZaPHD Flow ZPinch experiment investigates the stabilizing effect of sheared axial flows while scaling toward a highenergydensity laboratory plasma (HEDLP > 100 GPa). Stabilizing flows may persist until viscous ... 
Investigation of the ThreeDimensional Structure of a Rotating Magnetic Field Driven FieldReversed Configuration using Internal Magnetic Field Measurements
(20131114)The Translation, Confinement, Sustainment Upgrade device (TCSU) used a rotating magnetic field (RMF) to form and sustain plasma in a fieldreversed configuration (FRC). The physics of RMF current drive can be modeled in ... 
LowSpeed Stability and Control of Exploratory Tailless LongRange Supersonic Configurations
This thesis presents studies of the lowspeed stability and control of a representative longrange supersonic flight vehicle. The aircraft of interest is a research uninhabited aerial vehicle (RUAV), a 1/16th scaled model ... 
MHD Modeling in Complex 3D Geometries: Towards Predictive Simulation of SIHI Current Drive
(20140430)The HITSI experiment studies Steady Inductive Helicity Injection (SIHI) for the purpose of forming and sustaining a spheromak plasma. A spheromak is formed in a nearly axisymmetric flux conserver, with a bow tie cross ... 
Modeling Aircraft Position and Conservatively Calculating Airspace Violations for an Autonomous Collision Awareness System for Unmanned Aerial Systems
With the scheduled 30 September 2015 integration of Unmanned Aerial System (UAS) into the national airspace, the Federal Aviation Administration (FAA) is concerned with UAS capabilities to sense and avoid conflicts. Since ... 
Modeling and Control of a Quadrotor with Dynamic Inertia
(20130723)As the support and technology for unmanned vehicles has increased, so have the possible applications for Unmanned Aerial Vehicles (UAVs). From military intelligence gathering missions, to civilian search and rescue missions, ... 
MultiVehicle Function Tracking by Moment Matching
The evolution of many natural and manmade environmental events can be represented as scalar functions of time and space. Examples include the boundary and intensity of wildfires, of waste spills in bodies of water, and ... 
Multifunctional Thin Film Lithium Ion  Graphite Composite Structural Laminates
(20140224)The consolidation of batteries and airframe into a multifunctional structure can theoretically reduce the aircraft weight by exploiting the battery components as load bearing elements and by enabling a distributed power ... 
Networked Dynamic Systems: Identification, Controllability, and Randomness
(20130723)The presented dissertation aims to develop a graphcentric framework for the analysis and synthesis of networked dynamic systems (NDS) consisting of multiple dynamic units that interact via an interconnection topology. ... 
Nonlinear Aeroelastic Behavior of Tail / Rudder Systems with Freeplay and Actuator Failure
(20130725)This thesis discusses the development of numerical simulations implemented in MATLAB and of an experimental tail/rudder model for the investigation of the effects of nonlinearities on control surface flutter of a threedegree ... 
A Numerical Investigation of Rectangular Cylinders with Interest in Maximizing Drag
In this dissertation, rectangular cylinder flow is explored through a series of numerical simulations. First, rectangular cylinders at a Reynolds number of 20,000 are simulated using ReynoldsAveraged NavierStokes (RANS) ... 
Numerical Methods for 3dimensional Magnetic Confinement Configurations using TwoFluid Plasma Equations
(UMI, 20100624)The 5moment twofluid plasma model uses Euler equations to describe the ion and electron fluids, and Maxwell's equations to describe the electric and magnetic fields. Twofluid physics becomes significant when the ...