Now showing items 1-10 of 89
Design Optimization of Structures with Shape Memory Alloy Member Actuators
A capability was developed to build a perform mass-minimization of a truss with SMA actuation to determine optimal element diameters and actuator applied temperature changes. The Nonlinear Programming/Approximation Concepts (NLP/AC) approach was used. This method is based on using a sequence of approximate optimization ...
Towards Petascale DNS of High Reynolds-Number Turbulent Boundary Layer
In flight vehicles, a large portion of fuel consumption is due to skin-friction drag. Reduction of this drag will significantly reduce the fuel consumption of flight vehicles and help our nation to reduce CO<sub>2</sub> emissions. In order to reduce skin-friction drag, an increased understanding of wall-turbulence is needed. ...
Development and Characterization of Pressure-Sensitive Microbeads for Simultaneous Barometry and Velocimetry for Fluid Dynamic Applications
The use of luminescent dyes to measure pressures and temperatures on surfaces using Pressure Sensitive Paint (PSP) and Temperature-Sensitive Paint (TSP) is a well-established methodology. New technology has allowed for microbeads to be loaded with pressure and/or temperature sensitive dyes. These microbeads can be seeded into ...
State-Constrained Rotational and Translational Motion Control with Applications to Monolithic and Distributed Spacecraft
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 challenging from a control perspective. This is because a rotational configuration space is a boundless ...
Analysis of Delamination Arrest Fasteners in Bolted-Bonded Composite Structures
Delamination is one of the most critical damages in carbon fiber composites, which are being employed in primary aircraft structures. One common solution to prevent a delamination from propagating is to install fasteners, clamping the laminate together and partially arresting the delamination. In this thesis, the effectiveness ...
Autonomous Collision Avoidance and Mapping with a Quadrotor Using Panning Sonar Sensors
Recent research and development of autonomous vehicles has expanded their capabilities in both military and civilian applications. A variety of missions including military and police surveillance, scientific reconnaissance, and search and rescue in large or hazardous search areas can now be done more efficiently and effectively ...
MHD Modeling in Complex 3D Geometries: Towards Predictive Simulation of SIHI Current Drive
The HIT-SI 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 section, by means of two semi-toroidal injectors. The plasma-facing surfaces of the device, which are made ...
Adaptation and Automation of Search and Rescue Patterns with Implementation for an Operational Unmanned Aircraft System
The development and employment of Unmanned Aircraft Systems (UAS) is transferring many missions from manned aircraft to UAS. Search is one of these missions. This work proposes leveraging the familiar, well-established tools and procedures from search and rescue while automating them to increase efficiency and effectiveness. ...
Collision Avoidance in Biological Systems Using Collision Cones
Modeling and Control of a Quadrotor with Dynamic Inertia
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, the demand for highly capable UAVs is high. Drawing inspiration from biological examples such as the ...