Now showing items 2851-2860 of 2871
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 ...
Dynamic Stability of a Composite Circular Cylindrical Shell Subjected to Combined Axial and Torsional Loading
(Sage Publications, 1993)
The dynamic stability of thin, clamped, composite circular cylindrical shells is studied for combined axial and torsional loading. Each load is taken to be har monically varying; the frequencies of the two loads differ, ...
Plume-Surface Interactions due to Spacecraft Landings and The Discovery of Water on Mars.
(2010)
Pulsed supersonic jets or rocket plumes have different surface flow physics than steady jets, in particular in tenuous atmospheres such as that of Mars where jets are collimated over large distances compared to their ...
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 ...
Characterization of Performance and Current Drive Mechanism for the Rotating Magnetic Field Thruster
(2023)
The Rotating Magnetic Field (RMF) Thruster is a propulsion concept which, could enable a wide variety of mission architectures. The RMF thruster
can be operated either in the pulsed-mode, ejecting dense field-reversed ...