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Annual 2004-2005 Cover annual 2004-2005 Cover MASSACHUSETTS INSTITUTE OF TECHNOLOGY AERO-ASTRO Editors Ian A. Waitz William T.G. Litant Professor and Deputy Department Head Director of Communications [email protected] [email protected] Aero-Astro is published annually by the Massachusetts Institute of Technology Department of Aeronautics and Astronautics, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA. http://www.mit.aero Aero-Astro No.2. June 2005. ©2005 The Massachusetts Institute of Technology. All rights reserved. DESIGN Design Studio at Monitor Cambridge, MA 02141 [email protected] Cover: A pair of SPHERES (Synchronized Position Hold Engage and Reorient Experimental Satellites), micro-satellites designed to fl y in formation, fl oat in a zero-g test aboard NASA’s micro-gravity aircraft. Monitoring the test are (from left)) Stephanie Chan and Steve Sell of Payload Systems; Edmund Kong of Aero-Astro’s Space Systems Lab; Gary Blackwood of the Jet Propulsion Laboratory; and Mark Hilstad, an Aero-Astro doctoral candidate. SPHERES was developed through a three-semester undergraduate Aero-Astro capstone class. Chen, Kong, Blackwood, and Hilstad all hold degrees from MIT Aero-Astro. See page 1. (NASA photograph) The scholarly contributions reviewed in these pages reflect a new Aero-Astro department: Dear colleagues and friends: one positioned for the future We share an immense pride in this department. As we leafed and dedicated to continued through the galleys of this second annual issue of Aero-Astro, leadership in education, we were struck by the expertise, energy, diversity, dedication research, and service. and leadership of our Aero-Astro community. Turn the pages: you’ll read about Dave Miller and his students’ fascinating de- velopments in space architecture, Jack Kerrebrock’s profound advances in gas turbine design, Nancy Leveson’s ground- breaking work to ensure the safety of mission-critical software, and Moe Win’s pioneering exploration of ultrawide bandwidth communication. You’ll discover how Paul Wooster and Erika Wagner are leading a team that’s blending hardware design, biomedical engineering, systems engineering, biology, and management as they strive to be the first student group to or- bit and retrieve a mammal-bearing spacecraft. You’ll see how Dave Darmofal markedly improved student learning by apply- ing new engineering pedagogy, and how our unique Learning Laboratory has become an model for universities throughout the world that are adopting Aero-Astro’s CDIO educational design. Finally, you will read Sheila Widnall’s thoughts on her pioneering career as a leader within and outside MIT. The scholarly contributions reviewed in these pages reflect a new Aero-Astro department: one positioned for the fu- ture and dedicated to continued leadership in education, research, and service. We have recently reorganized our five teaching divisions (structures & materials; fluids & propulsion, systems; humans & automation; and information, controls & estimation) into three interdisciplinary sectors, each under major near-term challenges driven by uncertainty in the air- the leadership of one of our most distinguished faculty mem- line industry and the reduction in federal support of basic bers. Vincent Chan, the director of MIT’s Laboratory for aeronautics and astronautics research. Concomitant with Information and Decisions Systems and a dual appointment these challenges are major opportunities for Aero-Astro. with the Department of Electrical Engineering and Comput- These opportunities include: (1) the conception and design er Science, leads our Information Sector. Daniel Hastings, of a more efficient, safe, and secure national airspace sys- the Director of the Institute’s Engineering Systems Divi- tem; (2) the conception and design of vehicle technologies, sion (holding a dual appointment), leads the Systems Sector. operations and policy strategies to enable increased mobility Gas Turbine Lab Director Alan Epstein leads the Vehicles with decreased impact on the local and global environment; Technology Sector. (3) the conception and design of the next generation space communications system; (4) the conception and design of We are not resting on our laurels. Although we only recently system architecture and physical subsystems supporting ro- completed a multiyear implementation of our 1998 strategic botic and human space exploration; and (5) the conception, plan, we have begun a new process to formally reconsider design, development, and testing of pedagogies that greatly our mission, our guiding principles, and our strategy. The In- enhance the effectiveness and efficiency of engineering stitute is poised to enter a new era under the exciting leader- teaching and learning. ship of our new president, Susan Hockfield. And the future of aerospace — and our department — is confronted with As we wrote in the introduction to the last issue of Aero-Astro, we are proud of our past, but our focus is on the future. Again, the articles included here tell the tale of but a small fraction of our research, our teaching, and our people. Please accept our invitation to visit us in Cambridge, meet with us, take a tour, learn more, and, most importantly, let us know your thoughts about this department and how it should address the future. We’d enjoy the opportunity, and we think you will, too. After all, it’s hardly a chore to share thoughts about something you believe in — and are truly excited about! Aeronautics and Astronautics Department Head Wesley Harris and Deputy Head Ian Waitz with the heads of the new Department Sectors: (from left) Daniel Hastings, Systems Sector; Waitz; Harris; Alan Epstein, Vehicle Technologies Sector; and Vicent Chan, Informa- Wesley Harris Ian Waitz tion Sector. This team is ensuring Aero-Astro is positioned for the future and dedicated to continued leadership in education, research, and service. (William Litant photograph) Department Head Deputy Department Head DISTRIBUTED SATELLITE SYSTEMS OFFER VISION FOR EXPLORATION AND EDUCATION 1 By David W. Miller MIT-DESIGNED ASPIRATED COMPRESSORS = SHORTER, LIGHTER ENGINES: 7 A BOON FOR SUPERCRUISING JETS By Jack L. Kerrebrock LEARNING IN A LANDMARK LABORATORY 15 By William T.G. Litant STUDENTS REACT TO MORE EFFECTIVE TEACHING: CHANGING THE PEDAGOGY 25 By David L. Darmofal CONFIDENCE IN THE CODE 31 By Nancy G. Leveson MULTIPATH WIRELESS AT THE THRESHOLD OF ROBUST, 39 LOW-COST COMMUNICATION By Moe Win OF MICE AND MARS 45 By Paul Wooster and Erika Wagner FACULTY PROFILE: A ONE-ON-ONE WITH WIDNALL 49 By Lauren Clark CONTENTS LAB REPORT 55 1 7 15 25 31 39 45 49 Dave Miller in his lab with an electromagnetic formation fl ight testbed. EMFF — spacecraft positioning themselves through magnetic attraction/repulsion of other spacecraft — would use solar energy, obviating a dependence on fi nite fuel supplies brought with them from earth. (William Litant photograph) Distributed satellite systems offer vision for EXPLORATION AND EDUCATION By David W. Miller Astronomy has entered a golden age. We are starting to answer the age-old questions: How did it all begin, The MIT Aeronautics and Astro- how will it end, and is there life beyond Earth? nautics Department’s Space Systems Discovering the answers to these questions raises daunting Laboratory is developing an innova- engineering challenges. Space telescopes — our premier tive approach to satellite design that investigatory tools — are becoming ever larger, exceedingly alleviates drawbacks that have plagued precise, and more exotic. Our challenge is to engineer the industry: high design costs, complex- a telescope effectively the size of a football field, that ity of system integration and validation, operates in an environment only slightly warmer risk of large deployment, low reliability due than absolute zero, orbits 10 million miles from to design customization, and limited design Earth, is accurate to a precision less than the heritage and legacy. By modularizing typical sat- diameter of a hydrogen atom, and which ellite functions (e.g., propulsion, power, attitude we’ve never run in this operating control) and achieving subsystem interconnectivity environment prior to launch. through genderless docking ports, and wireless command and data handling, we simplify assembly and test prior to launch as well as enabling self-assembly and reconfiguration once on orbit. The goal is to reduce the cost, risk, and time required for the deployment of new spacecraft by changing the fundamental methodology used in their development. Most spacecraft are developed as point-designs, optimized for their particular missions. Launch costs are so high and opportunities so rare, that it is only natural for program managers to include as much functionality as possible into each spacecraft. For this reason, most spacecraft are one- or few-of-a-kind creations. While components may be reused from one spacecraft to the next, there is usually a high degree Exploration and Education 1 of customization, leading to inevitable increases in testing and verification costs, along with unavoidable decreases in reliability. This customization has several drawbacks. First, each spacecraft requires a substantial upfront design cost. Second, the resulting design lacks the risk reduction associated with flight heritage. Third, subsystem functionality cannot be truly tested until some level of system integration has been performed. Fourth, the designs lack the cost and learning curve savings of large production runs. Fifth, repair of subsystems prior to launch requires
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