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Now showing items 581-585 of 585
A systems-engineering assessment of multiple CubeSat build approaches
(Massachusetts Institute of Technology, 2016)
This research conducts a broad systems-based analysis of CubeSat engineering, with a focus on testing, failures, and their relationship to program cost, in order to assess multiple build approaches with a goal of maintaining ...
Numerical models of Hall thruster ionization oscillations
(Massachusetts Institute of Technology, 2016)
In this thesis, low frequency ionization oscillations in Hall thrusters resembling the breathing mode are studied through computational simulation. The relationship between wall erosion and discharge current oscillations ...
A vehicle design and optimization model for on-demand aviation
(Massachusetts Institute of Technology, 2018)
On-demand aviation refers to an envisaged air taxi service, using small, autonomous, vertical-takeoff-and-landing, battery-powered electric aircraft. A conceptual design and optimization tool for on-demand aviation is ...
Subsystem development and flight testing of an electroaerodynamic UAV
(Massachusetts Institute of Technology, 2017)
Electroaerodynamic (EAD) propulsion is a form of in-atmosphere electric thrust generation with no direct emissions, no moving parts, and is nearly silent. Previous work has quantified the thrust-to-power and thrust density ...
Spectral measurements of hydrogen Lyman-alpha in the atmospheres of Venus and Jupiter using a sounding rocket and the Hubble Space Telescope
(Massachusetts Institute of Technology, 2011)
The Lyman-alpha emission is a key signature of the presence of hydrogen, and from this emission many properties of planetary atmospheres can be analyzed. Two projects are studying this emission on two planets for two ...