Aerospace Engineering Commons^™

The Us Challenge To Stay The Worlds Technical Leader In Innovation, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint presentation created by Professor Bob Twiggs titled "The US Challenge to Stay the Worlds Technical Leader in Innovation" from October 18, 2012.

Fusion-Fission Hybrid Pulsed Propulsion System For Improved Space Transportation, Micah Laughmiller

Von Braun Symposium Student Posters

No abstract provided.

Microgravity Testing Of Uahuntsville’Schargersat-1, Justin Riegel

Von Braun Symposium Student Posters

No abstract provided.

Analysis Of Stacked Linear Transformer Drivers For Application In Nuclear Fusion Propulsion, Patrick Giddens

Von Braun Symposium Student Posters

No abstract provided.

Instrument For Testing The Effect Of Boiling In Microgravity, Eric Becnel

Von Braun Symposium Student Posters

No abstract provided.

Materials Selection Considerations For Z-Pinch Pulse-Powered Fusion Systems For Space Propulsion, Mitchell Rodriguez

Von Braun Symposium Student Posters

No abstract provided.

Analytical Modeling Of Stochastic Pulse-Pileup In Radiation Detectors, Vandiver Chaplin, P. N. Bhat

Von Braun Symposium Student Posters

No abstract provided.

Inertial Electrostatic Confinement Diffusion Thruster, Mark Becnel

Von Braun Symposium Student Posters

No abstract provided.

Advancing The Beamed Energy Ablation Driven Propulsion Engine Concept, Grant Bergstue

Von Braun Symposium Student Posters

No abstract provided.

Microgravity Stowage System–A Random Access System For Deep Space Habitat Implementation, Clint Deerman, Drew Deerman

Von Braun Symposium Student Posters

No abstract provided.

The Corona Reconnaissance Satellite Program, Amy Parlett

Von Braun Symposium Student Posters

No abstract provided.

100k High Altitude Student Rocket, Markus Murdy

Von Braun Symposium Student Posters

No abstract provided.

An Investigation Of U.S. Orbital Debris Policy Changes To Support Leo Conservation, Thomas Percy

Von Braun Symposium Student Posters

No abstract provided.

Validation Of The Ballistic Limit Equation For Monolithic Aluminum Shielding At Geostationary Orbital Debris Impact Velocity, Brandon Holladay

Aerospace Engineering

The Cal Poly Electro Magnetic Rail Gun was used to eject a 0.370 gram, rectangular aluminum projectile towards a 1/16 inch monolithic aluminum plate at a speed of 280 ± 50 m/s. The resulting impact left a large attached spall on the back of the shielding. The impact damage was compared to an industry ballistic limit equation for a spherical aluminum projectile of similar diameter and was shown to have slightly less damage than the expected results.

In addition, an aluminum mesh double bumper shield was fired upon in order to verify its higher protection per aerial density as well …

Three-Axis Stabilized Earth Orbiting Spacecraft Simulator, Alan F. Ma, Nikola N. Dominikovic

Aerospace Engineering

This report details the method and results of the program created for simulating an Earth orbiting spacecraft with control actuators and orbital perturbations. The control actuators modeled are reaction thrusters, reaction/momentum wheels, and control moment gyros (CMG). The perturbations modeled were gravity gradient, electromagnetic torques, solar radiation pressure, gravity gradients, third-body effects, Earth oblateness and atmospheric drag. This simulation allows for satellite control in all 6 degrees of freedom for any Earth orbiting spacecraft. Assumptions include rigid body dynamics, no sensor noise, constant spacecraft cross-sectional area, constant coefficient of drag and reflectivity, ignoring the effects due to the moon, moment …

Configuration Studies Of Electrostatic And Magnetostatic Active Space Radiation Shielding, Trac K. Nguyen

Electrical & Computer Engineering Theses & Dissertations

Developing successful and optimal solutions for mitigating the hazards of radiation in deep space is critical for the success of deep-space long duration explorations, including mission to the Moon, Mars and beyond. A recent report (Tripathi et al., 2008) had explored the feasibility of using electrostatic shielding in conjunction with state-of-the-art materials shielding technologies.

In this thesis research, we study the active electrostatic shielding strategy and examine a hybrid configuration that utilizes both electrostatic and magnetostatic fields. The main advantages of this system are shown to be: (i) much lower magnetic fields that could be below the thresholds set for …

Strain Rate And Orientation Dependencies Of The Strength Of Single Crystalline Copper Under Compression, Virginie Dupont, Timothy C. Germann

Aerospace Engineering - Daytona Beach

Molecular dynamics (MD) simulations are used to model the compression under uniaxial strain of copper single crystals of different orientations at various temperatures and strain rates. Uniaxial strain is used because of the close resemblance of the resulting stress state with the one behind a shock front, while allowing a control of parameters such as strain rate and temperature to better understand the behavior under complex dynamic shock conditions. Our simulations show that for most orientations, the yield strength of the sample is increased with increasing strain rate. This yield strength is also dependent on the orientation of the sample, …

Structural Damage Classification Using Support Vector Machines, Xiang Li

Doctoral Dissertations and Master's Theses

In this research, a methodology to classify crack and corrosion metallic damages using a time-frequency representation method and support vector machines is investigated. Piezoelectric ceramic actuators are utilized to generate guided wave signals on a set of aluminum beam coupons with different damage features, such as types, locations, and thicknesses. The short-time Fourier transform is applied to analyze the measured signals. For damage classification, the spectrograms obtained from finite element models are employed to train a two-class support vector machine learning classifier. The classifier is able to correctly classify different types of damages based upon the measured signals collected from …

Neural Network Fatigue Life Prediction In Steel I-Beams Using Mathematically Modeled Acoustic Emission Data, Prathikshen Nambiar Selvadorai

Doctoral Dissertations and Master's Theses

The purpose of this research is to predict fatigue cracking in metal beams using mathematically modeled acoustic emission (AE) data. The AE data was collected from nine samples of steel I-beam that were subjected to three-point bending caused by cyclic loading. The data gathered during these tests were filtered in order to remove long duration hits, multiple hit data, and obvious outliers. Based on the duration, energy, amplitude, and average frequency of the AE hits, the filtered data were classified into the various failure mechanisms of metals using NeuralWorks® Professional II/Plus software based self-organizing map (SOM) neural network. The parameters …

Acoustic Emission Signal Classification For Gearbox Failure Detection, Jun Shishino

Doctoral Dissertations and Master's Theses

The purpose of this research is to develop a methodology and technique to determine the optimal number of clusters in acoustic emission (AE) data obtained from a ground test stand of a rotating H-60 helicopter tail gearbox by using mathematical algorithms and visual inspection. Signs of fatigue crack growth were observed from the AE signals acquired from the result of the optimal number of clusters in a data set. Previous researches have determined the number of clusters by visually inspecting the AE plots from number of iterations. This research is focused on finding the optimal number of clusters in the …