Open Access. Powered by Scholars. Published by Universities.®
- Discipline
Articles 1 - 3 of 3
Full-Text Articles in Mechanical Engineering
Characteristic Of The Dynamics Of Disorder In Crystalline And Amorphous Materials, Amir Behbahanian
Characteristic Of The Dynamics Of Disorder In Crystalline And Amorphous Materials, Amir Behbahanian
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
This work provides the evidence to apply simulation methods that are applicable to systems with structural randomness to simulate crystalline materials at high temperatures. My work not only open the avenue to expand the simulation capability of materials but also provides insight to the physics of vibrations of atoms under different temperature and for different types of materials. I have also evaluated the reliability of Molecular Dynamics simulations at the frequency level and found that theses types of simulations, despite the previous belief, are reliable at low temperatures but up to a measurable frequency. In addition, the result of my …
Understanding Pyrotechnic Shock Dynamics And Response Attenuation Over Distance, Richard J. Ott
Understanding Pyrotechnic Shock Dynamics And Response Attenuation Over Distance, Richard J. Ott
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Component requirements govern design and production in the aerospace industry. One such potential requirement for a component is the survival and continued function upon exposure to shock environments. A shock event is a high amplitude, short duration traveling wave that induces large loads on components in its path that can cause degradation of electronic components, cracks and fractures in brittle materials, local plastic deformation, and materials to experience accelerated fatigue life. In defining these environments for new structures, industry experts rely mainly on empirical data. Measurements from similar structures are scaled and enveloped to create a predicted bounding case. This …
Linear Covariance Analysis For Gimbaled Pointing Systems, Randall S. Christensen
Linear Covariance Analysis For Gimbaled Pointing Systems, Randall S. Christensen
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Linear covariance analysis has been utilized in a wide variety of applications. Historically, the theory has made significant contributions to navigation system design and analysis. More recently, the theory has been extended to capture the combined effect of navigation errors and closed-loop control on the performance of the system. These advancements have made possible rapid analysis and comprehensive trade studies of complicated systems ranging from autonomous rendezvous to vehicle ascent trajectory analysis. Comprehensive trade studies are also needed in the area of gimbaled pointing systems where the information needs are different from previous applications. It is therefore the objective of …