Search
Now showing items 561-570 of 585
Identification and evolution of quantities of interest for a stochastic process view of complex space system development
(Massachusetts Institute of Technology, 2011)
The objective of stochastic process design is to strategically identify, measure, and reduce sources of uncertainty to guide the development of complex systems. Fundamental to this design approach is the idea that system ...
On the stability of complex ions in ionic liquid Ion sources
(Massachusetts Institute of Technology, 2015)
Ionic liquids are molten salts at room temperature that consist of positive and negative ions. These liquids can be used in electrosprays to produce ion beams. Ionic liquid ion source (ILIS) beams typically consist of ...
Effects of trans / supercritical behavior of carbon dioxide on power and propulsion applications
(Massachusetts Institute of Technology, 2018)
Operating combustors at supercritical conditions has the potential of reducing NOx emissions and enabling a more compact combustor design. However, this can have an impact on the combustion dynamics, and the impact of ...
A jam-resistant CubeSat communications architecture
(Massachusetts Institute of Technology, 2017)
This thesis proposes a communications system that utilizes the benefits of CubeSats to provide jam-resistant communications. The growth of CubeSats within educational communities has prompted their use in industry; both ...
Simulation of thin elastic solids in the incompressible viscous flow using implicit interface representation
(Massachusetts Institute of Technology, 2010)
This thesis provides a numerical algorithm to solve fluid-structure interaction problems in the Cartesian grid. Unlike the typical Immersed Interfaced Method (IIM), we define thin non-stretchable solid interface with the ...
A priori analysis of global and local output error estimates for CG, DG and HDG finite element discretizations
(Massachusetts Institute of Technology, 2016)
In this thesis, a priori convergence estimates are developed for outputs, output error estimates, and localizations of output error estimates for Galerkin finite element methods. Specifically, Continuous Galerkin (CG), ...
Optimal locations for the ground segment of optical space communications networks
(Massachusetts Institute of Technology, 2016)
Optical communications are envisioned as a key technology for space communication in the near future. This transition to optical terminals is being pushed by the higher data volume demand of certain missions and by the ...
Least Squares Shadowing for sensitivity analysis of chaotic dynamical systems
(Massachusetts Institute of Technology, 2016)
In numerous scientific and engineering fields, sensitivity analysis tools are essential for design optimization as well as uncertainty quantification. For instance, adjoint algorithms are common place in aerospace engineering ...
A tensor-train-decomposition-based algorithm for high-dimensional pursuit-evasion games
(Massachusetts Institute of Technology, 2016)
The research presented in this thesis was inspired by an interest in determining feedback strategies for high-dimensional pursuit-evasion games. When a problem is high-dimensional or involves a state space that is defined ...
Application of Bayesian-based uncertainty and global sensitivity analyses to spacecraft thermal design
(Massachusetts Institute of Technology, 2016)
As satellite design has increased in complexity, the evolution of thermal engineering of spacecraft has plateaued. For years, thermal engineers have used the same principles of designing to stacked worst case scenarios and ...