Browsing by Department "Aerospace Engineering"
Now showing items 120 of 149

A combined experimental and modeling study of low velocity perforation of thin aluminum plates
(20160113)This work conducts a combined experimental and modeling study of low velocity projectile perforation of thin AA5083H116 aluminum plates. Experiments were performed in order to characterize the candidate material and ... 
A discrete velocity method for the Boltzmann equation with internal energy and stochastic variance reduction
(20160115)The goal of this work is to develop an accurate and efficient flow solver based upon a discrete velocity description of the Boltzmann equation. Standard particle based methods such as Direct Simulation Monte Carlo (DSMC) ... 
A dynamical systems theory analysis of Coulomb spacecraft formations
(20130611)Coulomb forces acting between close flying charged spacecraft provide near zero propellant relative motion control, albeit with added nonlinear coupling and limited controllability. This novel concept has numerous potential ... 
A mixed integer convex programming approach to constrained attitude guidance
(20151209)This brief report introduces a new algorithm for attitude motion planning, Constrained Attitude Guidance (CAG) problem, in the presence of angular rate constraints and conic exclusion regions (pointing constraints). The ... 
A reusable command and data handling system for university CubeSat missions
(20140115)A Command and Data Handling (C&DH) system is being developed as part of a series of CubeSat missions being built at The University of Texas at Austin’s Texas Spacecraft Laboratory (TSL). With concurrent development of four ... 
A tabu search methodology for spacecraft tour trajectory optimization
(20141205)A spacecraft tour trajectory is a trajectory in which a spacecraft visits a number of objects in sequence. The target objects may consist of satellites, moons, planets or any other body in orbit, and the spacecraft may ... 
Acoustic waveforms produced by a laboratory scale supersonic jet
(20140905)The spatial evolution of acoustic waveforms produced by a Mach 3 jet are investigated using both 1/4 inch and 1/8 inch pressure field microphones located along rays emanating from the post potential core where the peak ... 
Acoustics from highspeed jets with crackle
(20130606)A scaling model based on an effective Gol'dberg number is proposed for predicting the presence of cumulative nonlinear distortions in the acoustic waveforms produced by highspeed jets. Two acoustic length scales, the shock ... 
Adaptation, gyroree stabilization, and smooth angular velocity observers for attitude tracking control applications
(20140908)This dissertation addresses the problem of rigidbody attitude tracking control under three scenarios of high relevance to many aerospace guidance and control applications: adaptive attitudetracking control law development ... 
Adaptive and convergent methods for large eddy simulation of turbulent combustion
(20150316)In the recent past, LES methodology has emerged as a viable tool for modeling turbulent combustion. LES computes the large scale mixing process accurately, thereby providing a better starting point for smallscale models ... 
Adaptive control for doubleintegrator class systems in the absence of velocity feedback
(20121206)This work considers formulation of new classes of adaptive controllers for doubleintegrator type systems where the underlying system parameters are uncertain and the complete statevector is not available for feedback. ... 
Adaptive estimation and control algorithms for certain classes of largescale sensor and actuator uncertainties
(20120629)This dissertation considers the general problem of controlling dynamic systems subject to largescale sensor and actuator uncertainties. The assumption is made that the uncertainty is limited to either pure rotation (i.e. ... 
Adaptive finite element simulation of flow and transport applications on parallel computers
(20110823)Not available 
Alignment filtering of ICESat flight data
(20121101)ICESat consisted of the Geoscience Laser Altimeter System (GLAS) and a commercial spacecraft bus. The stability of the GLAS to bus alignment was unknown and significant for GLAS pointing. Pointing control was performed by ... 
An attitude determination and control system for small satellites
(20150515)A flexible, robust attitude determination and control (ADC) system is presented for small satellite platforms. Using commercialofftheshelf sensors, reaction wheels, and magnetorquers which fit within the 3U CubeSat form ... 
An ensemble solution for the Earth's timevarying gravitational field from the NASA/DLR GRACE mission
(20130826)Several groups produce estimates of the Earth's timevarying gravitational field with data provided by the NASA/DLR Gravity Recovery and Climate Experiment (GRACE) mission. These unprecedented highly accurate global data ... 
Analysis of the characteristics of grace dual oneway ranging system
(20120924)The motivation for this research was an improvement of the quality of the Earth’s gravity solutions from the GRACE mission data through an instrumentlevel study. The objective was a better understanding of the characteristics ... 
An analytical approach to computing step sizes for finitedifference derivatives
(20120629)Finitedifference methods for computing the derivative of a function with respect to an independent variable require knowledge of the perturbation step size for that variable. Although rules of thumb exist for determining ... 
Analytical approach to the design of optimal satellite constellations for spacebased space situational awareness applications
(20120215)In recent years, the accumulation of space debris has become an increasingly pressing issue, and adequately monitoring it is a formidable task for designated groundbased sensors. Supplementing the capabilities of these ... 
The application of systems engineering to a Spacebased Solar Power Technology Demonstration Mission
(20120607)This thesis presents an endtoend example of systems engineering through the development of a Spacebased Solar Power Satellite (SSPS) technology demonstration mission. As part of a higher education effort by NASA to ...