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Daniel Guggenheim School of Aerospace Engineering
Daniel Guggenheim School of Aerospace Engineering
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ItemInventing the F-35 Joint Strike Fighter(Georgia Institute of Technology, 2012-12-06) Bevilaqua, PaulDuring the first century of flight, the focus of aerospace education has been on the methods of predicting lift and drag, with cost and schedule as dependent variables. Consequently, our engineers are very good at predicting performance, and aviation is one of the few areas where America sill has a favorable balance of trade. But America is facing new challenges as it works to adapt to the changing economy, energy, environmental and security demands of our nation. The mechanism for addressing these challenges during the next century of flight will be to focus education on achieving technical innovation with cost and schedule as independent variables and real constraints. This presentation will describe the development of the F-35 Joint Strike Fighter, which illustrates how technical innovation and a Lean approach to aircraft design can assure continued aviation leadership in this next century of flight. The technical innovation involves designing three highly common, but identical, variants of the same aircraft, incorporating a novel turboshaft cycle for vertical takeoff and landing. The principles of Lean Manufacturing were applied to the design process in order to control cost and schedule. The Collier Trophy, which each year recognizes “the greatest achievement in aeronautics or astronautics in America” was awarded to the development team for these accomplishments.
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ItemThe Manned UAV: Where is the Revolution Headed(Georgia Institute of Technology, 2012-11-30) Langford, John S.Where is the UAV revolution headed? One possibility is that it's not about manned versus unmanned, but about degrees of autonomy. Highly automated systems will put a wide range of new aircraft types into the National Airspace System, controlled by operators with a wide range of skills and experience. A step on this road is the "optionally piloted aircraft", some of which are flying today. This talk will review recent progress in unmanned air vehicles, examine some of the challenges of integrating robotic systems in the NAS, and explore the future potential of OPAs.
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ItemHandling Qualities Engineering(Georgia Institute of Technology, 2012-10-17) Padfield, Gareth D.This Nikolsky paper on rotorcraft handling qualities has been written under the enduring influence of a community of very dedicated engineers and pilots. The author looks back nearly 70 years and highlights particular events that reflect the continual growth of the handling qualities discipline and brought us to where we are in 2012. We at a point where designers have, within their grasp, the performance standards, criteria and test techniques, the understanding of rotorcraft aeromechanics and control and the design tools to ensure that handling deficiencies never again have to define the boundary of the operational flight envelope. The tension between flight performance and flight safety is properly managed by ensuring that Level 1 handling qualities are there for pilots throughout missions, including degraded environments and hazardous operations. This paper tells the story of how our industry has arrived at this point. Looking forward, we now need to strive for super-Level 1 handling quality, a state where pilot errors, in any shape or form attributable to deficient flight characteristics, are things of the past. The presentation takes the form of a narrative, describing the story of the idea that HQs can be quantified. During the first few years of the 20th century, the Wright brothers had carefully and thoroughly documented developments with their 1901-2 gliders to their 1903-5 powered aircraft. In contrast, no such recordings are available of the flight behavior of rotary wing aircraft in the 1920-30s. The story therefore begins with the post-war work in the UK and US research laboratories to understand better helicopter flight characteristics and the emergence of the first rotorcraft handling qualities requirements specification. The story then unfolds largely based on documents in the public domain written by engineers and pilots from European and North American industry, research laboratories and academia. This version of the story is also restricted to the single main rotor, “penny-farthing” configuration.
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ItemDamping Models for Shear Beams With Applications to Spacecraft Wiring Harnesses(Georgia Institute of Technology, 2012-09-20) Lesieutre, George A.Damping is an important aspect of aerospace sturctures designed to operate in dynamic environments. Wiring harnesses can significantly affect the dynamics of spacecraft structures. High-fidelity models of the coupled structure-cable dynamic system are needed to accurately predict launch loads and potential control system interactions. A beam model including first-order transverse shear can accurately capture the effects of cable mass and stiffness on dynamic response and provide insight into structural behavior. However, available time-domain damping models are inadequate for use in such a model- common proportional damping models predict modal damping that depends strongly and unrealistically on frequency. Inspired by a geometirc rotation-based viscous damping model that provides frequency-independent modal damping in an Euler-Bernoulli beam model, several time-domain viscous damping models are presented that exhibit weaker frequency dependence than proportional damping models. At low frequencies (bendingdominated modes), the models provide modal damping that is either directly or inversely proportional to the mode number. Model predictions compare favorably to available experimental data.
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ItemWhy Do We Want to Have a Space Program?(Georgia Institute of Technology, 2012-09-06) Griffin, MichaelFor more than fifty years, the exploration and development of space by the United States could have been characterized, without much exaggeration, as “all government, all the time”. There were exceptions, notably with regard to the commercial communications satellite industry, but they were just that – exceptions. Despite the entreaties of many who argued for a more balanced policy environment designed to encourage the development of commercial space enterprises, space development remained essentially a government preserve. Now, at least where human spaceflight – always the most visible symbol of the American space program – is concerned, we are confronted with a policy environment that is almost diametrically opposed to this decades-old paradigm, and commercial space enterprises are in vigorous pursuit of defense and intelligence community markets as well. This lecture will explore the ramifications of such policy shifts, together with the rationale for maintaining a robust national space effort, even as much new space activity shifts toward commercial development.
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ItemCuriosity’s Landing on Mars & the Future of Space Exploration(Georgia Institute of Technology, 2012-08-29) Elachi, CharlesOver the last 50 years, JPL spacecraft have visited every planet in our solar system and roved for more than 8 years on the surface of Mars. In addition, space borne telescopes have detected planets around neighboring systems, studied the composition and dynamic of galaxies across the Universe, and monitored changes in our planet’s surface and atmosphere. In this presentation, Dr. Charles Elachi will discuss the challenges of robotic space and Earth exploration, highlights of Curiosity’s recent landing on Mars, and present some of the engineering and technological challenges for future missions of exploration and discovery.