Now showing items 91-100 of 112
Numerical Prediction of Turbulent Non-Premixed Forced Ignition in Altitude Relight
(2021)
Fast and reliable altitude relight performance is one of the end goals of aircraft engine design. Relight involves the use of an external heat source (a kernel, for instance), to ignite a cold mixture of fuel and air in a ...
Autonomous Orbital Slot Maintenance with Impulsive Maneuvers and Reinforcement Learning
(American Institute of Aeronautics and Astronautics, 2024-01)
This paper investigates impulsive maneuver-based control methods for satellite orbital slot maintenance in the presence of dynamic variations. The objective is to develop an efficient controller that ensures the satellite ...
Optimized Measurement Timing for In-Space Thrust Inference
(American Institute of Aeronautics and Astronautics, 2024-01)
This paper considers the problem of optimizing the measurement timing for direct in-space thrust inference when the propulsive acceleration is known to act in the along-track direction and can be represented by a ...
Energy in Earth's Magnetosphere
(2023)
The space environment dominated by Earth’s magnetic field is the magnetosphere; this environment is carved from the surrounding solar wind, but under the right conditions the solar wind is able to directly interact with ...
Progressive Failure Analysis of Unreinforced and Z-pin Reinforced Composite Pi Joints Subjected to Quasi-Static and Fatigue Loading
(2023)
Fiber reinforced composites have become the material of choice in aerospace applications where weight constraints require high performance materials and structures. Advantages of composite materials include their high ...
Performance of a Magnetically Shielded Hall Thruster Operating on Krypton at High Powers
(2023)
Hall thrusters are increasingly being used for a variety of applications, including deep space missions, requiring higher powers than ever before. As their role in the world of space propulsion continues to grow, so too ...
Supporting Trust Calibration and Attention Management in Human-Machine Teams Through Training and Real-Time Feedback on Estimated Performance
(2022)
Trust, the attitude that an agent will help achieve an individual’s goals in a situation characterized by uncertainty and vulnerability (Lee & See, 2004), plays a critical role in supervisory control and human-machine ...
Ground Vibration Testing and Finite Element Model Updating of Very Flexible Aircraft
(2023)
As aircraft wings become more flexible as a consequence of searching for more fuel efficient and higher performance solutions, structural nonlinearities become more apparent. Geometric nonlinearities make the structure’s ...
Constrained Control and Online Safety Filtering for Autonomous Space Systems
(2024)
This dissertation presents advances in the design of constrained control laws, specifically control barrier function (CBF) quadratic program (QP) based control laws, herein called safety filters, with a focus on space ...
Additive Manufacturing of High-Performance Engineering and Piezoelectric Polymers through Precipitation Printing
(2024)
Additive manufacturing (AM), or 3D printing of lightweight engineering polymers has become a crucial part in the industrial manufacturing process in the past two decades, which allows for scalable fabrication of complex ...