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This thesis encompasses research performed in the focus area of structural health monitoring. More specifically, this research focuses on high velocity impact testing of carbon fiber reinforced structures, especially plates, and evaluating the damage post-impact. To this end, various non-destructive evaluation techniques such as ultrasonic C-scan testing and flash thermography were utilized for post-impact analysis. MATLAB algorithms were written and refined for the localization and quantification of damage in plates using data from sensors such as piezoelectric and fiber Bragg gratings sensors. Throughout the thesis, the general plate theory and laminate plate theory, the operations and optimization of the gas gun, and the theory used for the damage localization algorithms will be discussed. Additional quantifiable results are to come in future semesters of experimentation, but this thesis outlines the framework upon which all the research will continue to advance.
ContributorsMccrea, John Patrick (Author) / Chattopadhyay, Aditi (Thesis director) / Borkowski, Luke (Committee member) / Barrett, The Honors College (Contributor) / Mechanical and Aerospace Engineering Program (Contributor) / Department of Military Science (Contributor)
Created2015-05
Description
This paper describes the research done to attempt to scale up thrusts produced by ionic wind thrusters, or "lifters" to magnitudes needed to power a 2 kg hobbyist remote-control airplane. It includes background information on the Biefeld-Brown effect and the thrust it produces, an experiment that attempted to prove that thrust can be scaled up from smaller ionic wind thrusters to larger scales, and two models predicting thruster geometries and power sources needed to reach these thrusts. An ionic wind thruster could not be created that would power the hobbyist remote as a high-voltage power source with voltage and power high enough could not be obtained. Thrusters were created for the experiment using balsa wood, aluminum foil, and thin copper wire, and were powered using a 30 kV transformer. The thrusters attempted to test for correlations between thrust, electrode length, and current; electric field strength, and thrust; and thrust optimization through opening up air flow through the collector electrode. The experiment was inconclusive as all the thrusters failed to produce measurable thrust. Further experimentation suggests the chief failure mode is likely conduction from the collector electrode to the nearby large conductive surface of the scale.
ContributorsHaug, Andrew James (Author) / White, Daniel (Thesis director) / Takahashi, Timothy (Committee member) / Middleton, James (Committee member) / Mechanical and Aerospace Engineering Program (Contributor) / Department of Military Science (Contributor) / Barrett, The Honors College (Contributor)
Created2017-12
Description
In the grand scheme of things, the time that I spent in Tanzania was insignificant. I have lived through two hundred and fifty two months in my life. And of those, only two of them were spent in Africa. I have experienced many things in my short life as a twenty one year old, however, the experiences that I went through in Tanzania are the ones that I seem to think about the most. This time in my life, these experiences, have almost seemed to overwrite many of my old memories. They are all that I can think about. They are all that I can write about. They are all that I can dream about.
For this creative project, I have decided to highlight two memories from my time in Tanzania. I have titled it Empty but Full: Experiences While Teaching In Eastern Africa. These memories are the ones that I think about the most. They are the ones that I think about unconsciously. Everything that I do reminds me of them. I often attempt to repress these memories. I try to think of the happier times while I was over there. However, no matter what I do, what I try to distract myself with, they always seem to bubble to the surface. These are not happy memories. They do not make me smile and they often make me cry to to think about. Even though I had a tough time writing these, I feel that these are moments that people should know about. Moments that people can learn from. This is why I have decided to write about these memories. These stories are raw and they do not pull any punches. They are exactly what I witnessed and exactly what I was feeling those dark moments. When I close my eyes at night, my mind often goes back to that vibrant green jungle where I became a changed man.
For this creative project, I have decided to highlight two memories from my time in Tanzania. I have titled it Empty but Full: Experiences While Teaching In Eastern Africa. These memories are the ones that I think about the most. They are the ones that I think about unconsciously. Everything that I do reminds me of them. I often attempt to repress these memories. I try to think of the happier times while I was over there. However, no matter what I do, what I try to distract myself with, they always seem to bubble to the surface. These are not happy memories. They do not make me smile and they often make me cry to to think about. Even though I had a tough time writing these, I feel that these are moments that people should know about. Moments that people can learn from. This is why I have decided to write about these memories. These stories are raw and they do not pull any punches. They are exactly what I witnessed and exactly what I was feeling those dark moments. When I close my eyes at night, my mind often goes back to that vibrant green jungle where I became a changed man.
ContributorsFretto, Jacob Todd (Author) / Sklar, David (Thesis director) / Beardsley, Audrey (Committee member) / Department of Military Science (Contributor) / School of Human Evolution & Social Change (Contributor) / Barrett, The Honors College (Contributor)
Created2019-05