Edward F. Crawley

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The aim of this research is to design an executable meta-language that supports system architects’ modeling process by automating certain model construction, manipulation and simulation tasks. This language specifically addresses the needs in systematically communicating architects’ intent with a wide range of stakeholders and to organize knowledge from(More)
This paper represents system models as algebraic entities and formulates model transformation activities as algebraic operations. We call this modeling framework “Algebra of Systems” (AoS). To show that AoS can automate complex model reasoning tasks in system design projects, we implemented the abstract algebraic specification as an executable metalanguage(More)
NASAs Space Communication and Navigation (SCaN) Program is responsible for providing communication and navigation services to space missions and other users in and beyond low Earth orbit. The current SCaN architecture consists of three independent networks: the Space Network (SN), which contains the TDRS relay satellites in GEO; the Near Earth Network(More)
Commonality, or the sharing of components, processes, technologies, interfaces and/or infrastructure across a product family, represents one of many potential tools for increasing corporate profitability. Industrial interest in commonality is strong, but results appear to be mixed. A rich stream of academic research has examined commonality (typically under(More)
Precision opto-mechanical systems, such as space telescopes, combine structures, optics and controls in order to meet stringent pointing and phasing requirements. In this context a novel approach to the design of complex, multi-disciplinary systems is presented in the form of a multivariable isoperformance methodology. The isoperformance approach rst nds a(More)
Although NASA has yet to choose an architecture for human spaceflight beyond Earth orbit, they must pursue near-term investment in the enabling technologies that will be required for these future systems. Given this architectural uncertainty, it is difficult to define the value proposition of technology investments. This paper proposes a method for(More)
Current planning activities for human spaceflight development are centered on exploration beyond Earth orbit, focusing primarily on the destinations of the Moon, Near Earth Asteroids (NEAs), and Mars. In order to more effectively define future programs, key system level features impacting mission infrastructure performance and cost must be identified and(More)
The sustainability of space exploration will depend in large part on its ability to consistently and reliably deliver valued benefits to societal stakeholders over an extended period. This on-going research studies the values of prospective stakeholders in the space exploration enterprise—both in the near term and with a perspective extending over decades.(More)