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Now showing items 31-40 of 585
An adaptive control technology for flight safety in the presence of actuator anomalies and damage
(Massachusetts Institute of Technology, 2010)
The challenge of achieving safe flight comes into sharp focus in the face of adverse conditions caused by faults, damage, or upsets. When these situations occur, the corresponding uncertainties directly affect the safe ...
Assessment of propfan propulsion systems for reduced environmental impact
(Massachusetts Institute of Technology, 2010)
Current aircraft engine designs tend towards higher bypass ratio, low-speed fan designs for improved fuel burn, reduced emissions and noise. Alternative propulsion concepts include counter-rotating propfans (CRPs) which ...
Accelerated Bayesian experimental design for chemical kinetic models
(Massachusetts Institute of Technology, 2010)
The optimal selection of experimental conditions is essential in maximizing the value of data for inference and prediction, particularly in situations where experiments are time-consuming and expensive to conduct. A general ...
The impact of rapid transItions in mental workload in a supervisory control setting
(Massachusetts Institute of Technology, 2014)
With improving and expanding automation in domains such as unmanned aerial vehicles, nuclear power plants, and commercial aviation, operators will be expected to handle long periods of low task load while monitoring these ...
Accelerated computational modeling of ballistic helmet test protocols
(Massachusetts Institute of Technology, 2017)
In modern combat, helmets play a vital role in protecting the head. Before being delivered to the soldier, combat helmets undergo a series of tests to determine their threat mitigation performance. During ballistic testing, ...
The influence of runway occupancy time and wake vortex separation requirements on runway throughput
(Massachusetts Institute of Technology, 2013)
Air traffic growth in the U.S. has led to runway capacity constraints in the air transportation network. There has been limited new construction of runways due to land availability. One approach to increase capacity of ...
From CubeSats to constellations : systems design and performance analysis
(Massachusetts Institute of Technology, 2013)
The primary purpose of an Earth observing spacecraft constellation is to obtain global measurements with improved spatial and temporal resolution. The small size, low cost, standardized form factor, and increasing availability ...
Qualification and characterization of metal additive manufacturing
(Massachusetts Institute of Technology, 2016)
Additive manufacturing (AM) has emerged as an effective and efficient way to digitally manufacture complicated structures. Raytheon Missile Systems seeks to gain limited production capability with metals AM, which can only ...
Integration and test of the REgolith X-ray Imaging Spectrometer and recommendations for low-cost, high-risk spaceflight programs
(Massachusetts Institute of Technology, 2016)
NASA Risk Class D programs must meet their technical goals with limited resources. The Regolith X-Ray Imaging Spectrometer (REXIS) is a Class D student collaboration instrument flying on the NASA OSIRIS-REx mission. This ...
A risk analysis of unmanned aircraft systems in the National Airspace system for utility applications
(Massachusetts Institute of Technology, 2016)
A need exists for utility companies to incorporate unmanned aircraft systems (UAS) into their operations to reduce the cost and increase the safety of asset inspections. The FAA is allowing the use of UAS for commercial ...