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Browsing Aeronautics and astronautics by Title
Now showing items 254-273 of 314
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Scalable Coordination of Intelligent Vehicles in Shared Markovian Dynamics
Driven by the growing demand for mobility and connectivity, future aerospace-based transportation systems necessitate efficient coordination of not just one, or two, but a population of intelligent vehicles that execute ... -
Scalable Coordination of Intelligent Vehicles in Shared Markovian Dynamics
Driven by the growing demand for mobility and connectivity, future aerospace-based transportation systems necessitate efficient coordination of not just one, or two, but a population of intelligent vehicles that execute ... -
Semi-Autonomous Networks: Effective Control of Networked Systems through Protocols, Design, and Modeling
(2013-11-14)The objective of this dissertation is to explore the analysis and design of controlled networked dynamic systems - dubbed semi-autonomous networks. This work approaches the problem of effective control of semi-autonomous ... -
Shear-sensitive polymer dispersed liquid crystal
(2012-09-13)Polymer dispersed liquid crystal has been developed as a shear stress sensor, showing a great signal-to-noise ratio with a high temporal bandwidth. Traditional shear sensing liquid crystal techniques are known to be ... -
Simulated Hail Ice Mechanical Properties and Failure Mechanism at Quasi-Static Strain Rates
(2013-07-23)Hail is a significant threat to aircraft both on the ground and in the air. Aeronautical engineers are interested in better understanding the properties of hail to improve the safety of new aircraft. However, the failure ... -
Simulation of Gust Generator-Induced Wind Tunnel Flow Fields
A mathematical/numerical investigation was carried out of the flow characteristics of wind tunnel test section flow influenced by a gust generation system. The University of Washington's 3'x3' Low-Speed wind tunnel was ... -
Simultaneous Spectroscopic Determination of Ion Temperature, Electron Density, and Magnetic Field for the ZaP-HD Experiment
For over a decade, the ZaP Flow Z-Pinch experiment has demonstrated a sheared-flow stabi- lized Z-pinch, a linear plasma configuration with longitudinal current flow and azimuthal magnetic field confinement. A recent upgrade ... -
Single-Element Characterization of the LS-DYNA MAT54 Material Model
(2013-04-17)Research was completed to characterize the root behavior of the LS-DYNA MAT54 composite orthotropic material model. This primarily involved investigating the constitutive relations, ply failure (damage onset), ply deletion, ... -
A Single-Stage Reusable Launch Vehicle Concept
A reusable VTVL (vertical take-off, vertical landing), all-rocket SSTO (single-stage-to-orbit) launch vehicle is proposed to reduce the cost of space transportation. The concept vehicle is based on presently-existing or ... -
Solid Rocket Augmentation for Ram Accelerator Initial Launch
The ram accelerator is a hypervelocity launcher capable of speeds over 2 km/s and theoretically much higher. It operates by launching a projectile into a tube pre-filled with gaseous propellant, which combusts and generates ... -
Spatio-temporally Resolved Magnetic Field Measurements in the ZaP-HD Flow Z-Pinch Device Using Zeeman Splitting
The ZaP-HD shear-flow-stabilized (SFS) Z-pinch experiment has successfully proven that the instabilities of the simple Z-pinch plasma confinement scheme can be mitigated with sheared flow. Results from ZaP-HD have been ... -
Stability Analysis and Geometric Control for a Bluff-Body Hydrodynamic Vehicle
In this work, the bluff-body hydrodynamic robotic system, RoboRay, is introduced, and an early framework for modeling, stability, and control is developed. A model is proposed for the system, including a fluid dynamics ... -
Stability and Control of a Morphing Vehicle
(2013-02-25)Air vehicle design is a study in compromises. Aircraft configurations are optimized to perform at one point in their flight envelope at the expense of performance at off nominal flight conditions. Two wildly different ... -
Stability-Based Hybrid Automata for Safety Verification Using Continuation Methods
The rapid development of increasingly autonomous systems has advanced the challenge of safety assurance beyond the capabilities of existing methods. Therefore, new means of verification and validation are required to ensure ... -
The star thrust experiment, rotating magnetic field current drive in the field reversed configuration
(2001)The Star Thrust Experiment (STX) has formed and sustained the Field Reversed Configuration (FRC) with a Rotating Magnetic Field (RMF) operated at a strength of 25 G and a frequency of 350 kHz. The RMF was generated with ... -
State-Constrained Rotational and Translational Motion Control with Applications to Monolithic and Distributed Spacecraft
(2014-04-30)The main research in this dissertation deals with translationally and rotationally constrained motion planning within aerospace literature. The topology of such a configuration manifold for a rigid body system is fundamentally ... -
A Strategy for Multiple Cooperative Spacecraft to Control the Translational Velocity of a Shared Payload
The scale of payloads that can be moved in space is effectively dictated by the propellant storage, maximum thrust, and thrust efficiency of the upper-stages on modern launch vehicles. These vehicles must control the payload ... -
Structural Optimization for Automated Fiber Placement
Structural optimization has long been used with isotropic materials to provide a preliminary design of components for revision toward a final part. Generative solutions closer to this final state can be obtained by ... -
Structural optimization of 3D printed designs with spatially-varying material properties
Design with conventional, homogeneous materials has historically been limited to finding ideal geometry to fit a given engineering purpose. These designs are driven by necessary geometric discontinuities which cause high ... -
A study of jet exhaust-wing interaction
(2005)Non-steady loading of surfaces embedded in a two-dimensional shear-layer is studied as a first step in understanding and predicting the forces generated in aircraft exhaust-jet and wing interactions. It is hypothesized ...