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Now showing items 21-30 of 2018
Spacecraft design-for-demise strategy, analysis and impact on low earth orbit space missions
(Massachusetts Institute of Technology, 2009)
Uncontrolled reentry into the Earth atmosphere by LEO space missions whilst complying with stipulated NASA Earth atmospheric reentry requirements is a vital endeavor for the space community to pursue. An uncontrolled reentry ...
Integrated modeling and simulation of lunar exploration campaign logistics
(Massachusetts Institute of Technology, 2007)
As NASA prepares to establish a manned outpost on the lunar surface, it is essential to consider the logistics of both the construction and operation of this outpost. This thesis presents an interplanetary supply chain ...
A diagnostics architecture for component-based system engineering
(Massachusetts Institute of Technology, 2004)
This work presents an approach to diagnosis to meet the challenging demands of modern engineering systems. The proposed approach is an architecture that is both hierarchical and hybrid. The hierarchical dimension of the ...
Reconfigurable autopilot design for a high performance aircraft using model predictive control
(Massachusetts Institute of Technology, 2004)
The losses of military and civilian aircraft due to control surface failures have prompted research into controllers with a degree of reconfiguration. This thesis will describe a design approach incorporating Model Predictive ...
Tradespace exploration for space system architectures : a weighted graph framework
(Massachusetts Institute of Technology, 2014)
Many systems undergo significant architecture-level change during their lifecycles as a result of exogenous system disturbances (e.g. budget reduction or changes in stakeholder requirements), failure to develop critical ...
Simulation development and analysis of attitude-control system architectures for an astronaut mobility unit
(Massachusetts Institute of Technology, 2014)
Control-moment gyroscopes (CMGs) are spacecraft attitude-control actuators which control the spacecraft's orientation and pointing. CMGs operate on electrical power and therefore obey the the conservation of angular momentum. ...
Architecting space communication networks
(Massachusetts Institute of Technology, 2014)
Reliable communication and navigation services are critical to robotic and human space missions. NASA currently provides them through three independent and uncoordinated network that consist of both Earth-based and space-based ...
Aerothermodynamics and operation of turbine system under unsteady pulsating flow
(Massachusetts Institute of Technology, 2015)
An assessment of a turbine system operating under highly pulsating flow environment typically found in vehicular turbochargers is made to: identify the key operating parameters, enable the formulation of a reduced order ...
Identification of leading indicators for producibility risk in early-stage aerospace product development
(Massachusetts Institute of Technology, 2015)
Producibility is an emergent property of product development and manufacturing systems that encapsulates quality, product compliance, cost, and schedule. Detailed product definition and process variation have traditionally ...
Control of spacecraft in proximity orbits
(Massachusetts Institute of Technology, 2007)
Formation flying of spacecraft and autonomous rendezvous and docking of spacecraft are two missions in which satellites operate in close proximity and their relative trajectories are critically important. Both classes of ...