Now showing items 1-10 of 97
Angular Properties of Ionic Liquid Electrospray Emitters
(American Institute of Aeronautics and Astronautics, 2023-01)
The angular distribution of emitted species in electrospray ion beams is not well characterized and can have negative effects on propulsive performance and emitter lifetime. We present an experimental characterization of ...
Ultra-Long Baseline Time-of-Flight Mass Spectrometry with the AMIGAS Multi-Spacecraft Concept
(Institute of Electrical and Electronics Engineers, 2023-03)
Time-of-flight mass spectrometry allows for the study of elemental, isotopic, and molecular composition from a material sample. The mass sensitivity and resolution of time-of-flight mass spectrometers increases with the ...
A Method for Direct In-Space Thrust Estimation from Low-Acceleration Orbital Maneuvers
(2023-06)
This paper presents a method for performing direct in-space thrust estimation for low-acceleration propulsion systems using measurements of the spacecraft's position taken during an orbital maneuver. The method is based ...
Segmented Reconstruction of Low-Acceleration Orbital Maneuvers
(American Institute of Aeronautics and Astronautics, 2023-08)
This paper considers the problem of inferring the acceleration acting on a spacecraft in a near-circular orbit around a large planetary body when the acceleration is known to act in the along-track direction. A segmented ...
Left Inversion, System Zeros, and Input Estimation
(2022)
This dissertation focuses on input estimation, that is, estimation of the input to a linear system using knowledge of the output measurements and the system model for tall or square systems with full column rank. First, ...
Experimental and Computational Studies of the Low Velocity Impact and Compression After Impact of Carbon Fiber Reinforced Polymer Composites
(2021)
Carbon fiber reinforced polymer (CFRP) composites have been widely used in many industrial sectors because of their high strength-to-weight ratio, cost advantages, and the possibility of tailoring the design. During the ...
Advances in the Theory of Fixed-time Stability with Applications in Constrained Control and Optimization
(2021)
Driving the state of dynamical systems to a desired point or set is a problem of crucial practical importance. Various constraints are present in real-world applications due to structural and operational requirements. ...
Deterministic-Kinetic Computational Analyses of Expansion Flows and Current-Carrying Plasmas
(2021)
Spacecraft electric propulsion (EP) takes advantage of the ability of electric and magnetic fields to accelerate plasmas to high velocities to generate efficient thrust. The thermionic hollow cathode is a critical component ...
Data-Driven Modeling of Compressible Reacting Flow Using Hardware-Oriented Algorithms
(2022)
High-fidelity numerical simulations of combustion processes in next-generation hypersonic propulsion devices (including, but not limited to, rotating detonation engines and scramjets) play a crucial role in enabling robust ...
Integrated Damage Sensing in Fiber-Reinforced Polymer Matrix Composites Using Nano- and Micro-Scale Materials
(2021)
Composite materials have significantly contributed to advances in state-of-the-art aircraft and spacecraft design, resulting in lighter and more flexible structures which have pushed the boundaries of performance and ...