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Now showing items 481-490 of 585
Non-uniform radial meanline method for off-design performance estimation of multistage axial compressors
(Massachusetts Institute of Technology, 2018)
The increasing use of renewable energy sources necessitates power-generating gas turbines capable of frequently and rapidly starting up to supplement the energy supply when renewable sources alone cannot meet demand [1], ...
Engineering for humans : a new extension to STPA
(Massachusetts Institute of Technology, 2017)
From space shuttles to airplanes to everyday automobiles, today's systems are increasingly complex-and increasingly connected. In order to ensure that increased complexity does not simply bring an increased number of ...
Optomechanical design, analysis, and testing of the nanosatellite optical downlink experiment
(Massachusetts Institute of Technology, 2018)
As space payloads are miniaturized, many companies and government agencies are fielding small satellites that can compete with traditional "monolithic" satellites. More than 250 CubeSats were launched into orbit in 2017 ...
Development of a two-dimensional model of blood microcirculation flows
(Massachusetts Institute of Technology, 2017)
This thesis presents the development of a dimensionless blood microcirculation model for the study of blood microcirculation flows. It is a two dimensional, axially symmetric, incompressible, Newtonian-flow, Krogh cylinder ...
Public health impacts of excess NOx̳ emissions from Volkswagen diesel passenger vehicles in Germany
(Massachusetts Institute of Technology, 2017)
In September 2015, the Volkswagen Group (VW) admitted the use of "defeat devices" designed to lower emissions measured during VW vehicle testing for regulatory purposes. Globally, 11 million cars sold between 2008 and 2015 ...
RPK growth modeling for passenger airlines using network-related variables
(Massachusetts Institute of Technology, 2019)
On average, an airline starts to place orders or aircraft within 3 - 10 years before the expected delivery date. During this time, there could be changes given the natural response of the airlines to continuously refine ...
Preliminary development and flight trials of a cruise altitude and speed optimization decision support tool
(Massachusetts Institute of Technology, 2018)
A cruise altitude and speed optimization decision support tool, based on the concept of a minimum cost altitude tunnel, was developed to aid flight crew and dispatcher situational awareness and decision-making in vertical ...
Emergence of second-generation low earth orbit satellite constellations : a prospective technical, economic, and policy analysis
(Massachusetts Institute of Technology, 2018)
Modern proposals for Low Earth Orbit (LEO) satellite constellations underscore the tremendous potential and versatility of distributed spacecraft missions (DSMs), but they have also begun to stress the limits of the existing ...
Systems-theoretic process analysis and safety-guided design of military systems
(Massachusetts Institute of Technology, 2017)
Increasingly complex software enabled systems demand a new hazard analysis and safety-guided design technique in order to meet stringent safety standards and expectations. System Theoretic Process Analysis (STPA) proves ...
Conceptual engineering design and optimization methodologies using geometric programming
(Massachusetts Institute of Technology, 2018)
Geometric programs (GPs) and other forms of convex optimization have recently experienced a resurgence due to the advent of polynomial-time solution algorithms and improvements in computing. Observing the need for fast and ...