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21st International Communications Satellite systems Conference and Exhibit, ICSSC 2003

作者： Hoeber, Christopher F. Van, Ommering Gerrit Grybos, David P. Kosinski, Brian P. Wray, Larry Program Management and Systems Engineering United States Research and Development United States Space Systems/Loral Palo Alto California 94303 United States

ISBN: (纸本)9781624100932

As communications satellite services become increasingly integrated into the world economy, the reliability and robustness of the satellites that provide those services grow in importance. In a highly competitive market, reliability leads to new business. Perhaps because of increased visibility of a few high profile outages, the public perceives satellite transmission as risky. However, Space systems/Loral's analysis of the on-going performance of its satellite fleet indicates that reliability is holding or even improving despite the trends of increased satellite size and complexity. Larger, more capable satellites have proven to be no less reliable than their smaller predecessors. SS/L believes that, since each new satellite program is no longer a new development with the customer paying a large percentage of the contract value for nonrecurring engineering, it is important for the spacecraft manufacturer to institutionalize a set of reliability standards, rather than relying on contract terms to impose an outside set. Beginning about three years ago, SS/L undertook a coordinated set of reliability initiatives including comprehensive test programs designed to address the customer demand for increased robustness. The business implications of these initiatives and initial market reaction to their demonstrated effectiveness are apparent. After three years, initial on-orbit experience shows that these initiatives are working. © 2003 Space systems/Loral.

关键词： Commerce

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High-temperature fuel cell warm-up influence on vehicle fuel consumption

High-temperature fuel cell warm-up influence on vehicle fuel...

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Future Transportation Technology Conference

作者： Gay, Sébastien E. Ehsani, Mehrdad Advanced Vehicle Systems Research Program Department of Electrical Engineering Texas A and M University College Station TX 77843-3128 United States

Unlike internal combustion engines, fuel cells cannot deliver full power upon cold start. Furthermore, while low temperature fuel cells are capable of cold start, medium and high temperature fuel cells are not and must be artificially heated to start. This paper analyzes the warm-up energy requirements of the three medium and high-temperature fuel cell technologies and their influence on the vehicle fuel consumption over various drive cycles. The appropriateness of each technology for a given type of vehicle is assessed. It is found that high temperature fuel cells are inadequate for the intermittent use characteristic of vehicles drive cycles. More research is required as this study is inconclusive for medium temperature fuel cells. Copyright © 2003 SAE International.

关键词： Fuel cells

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Emergence of adaptive behavior by chaotic neural networks

Emergence of adaptive behavior by chaotic neural networks

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IEEE International Symposium on Computational Intelligence in Robotics and Automation (CIRA)

作者： I. Suzuki H. Yokoi Y. Kakazu Laboratory of Autonomous Systems Engineering Research Group of Complex systems Engineering Graduate School of Engineering Hokkaido University Japan

In this paper, we propose an emergent system in which an autonomous mobile robot can acquire environment oriented behavior. In the general robotic engineering, a system designer gave the model of environment and sensory-motor commands beforehand. However, we think that the autonomous robot has to be developed through the interaction between robot's behavior and the environmental information by itself. So, we construct the controller for the autonomous robot to acquire the adaptive behavior with the chaotic neural networks (CNNs). Furthermore, we make use of the dynamic learning method (DLM) as an on-line learning method. The results of the computational experiments show the chaotic search of this network plays an important role for the acquisition of the adaptive behavior.

关键词： Chaos Neural networks Robot sensing systems Learning systems Mobile robots Design engineering systems engineering and theory programmable control Adaptive control Cellular neural networks

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Ammonia hydrogen carrier for fuel cell based transportation

Ammonia hydrogen carrier for fuel cell based transportation

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Future Transportation Technology Conference

作者： Gay, Sébastien E. Ehsani, Mehrdad Advanced Vehicle Systems Research Program Department of Electrical Engineering Texas A Ad M University College Station TX 77843-3128 United States

Hydrogen is the preferred fuel for low-temperature fuel cells that are envisioned by some for future transportation. A pure hydrogen supply is technically challenging, presently uneconomical, energetically costly and dangerous in many respects. The use of hydrogen carriers, hydrogen-rich chemicals is supposed to overcome these impediments. Among the several possible hydrogen carriers [1], ammonia is an interesting candidate that has benefited from some research in the 1960s and recently for fuel cells [2 - 26], internal combustion engines [3, 27 - 35] and gas turbines [36, 37]. This paper summarizes the past research on ammonia as a hydrogen carrier for fuel cell based transportation. The physical and chemical properties, the production, the storage, the safety aspects, and the on-board processing of ammonia are summarized. Deriving from this review, the place of ammonia in fuel cell based transportation is analyzed. The type of transportation system most likely to accommodate ammonia's limitations and to benefit the most from its advantages is specifically discussed. Copyright © 2003 SAE International.

关键词： Ammonia

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Nanoscale heat transfer modeling in solids: Data storage and electronic devices

Nanoscale heat transfer modeling in solids: Data storage and...

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STLE/ASME Joint International Tribology Conference and Exhibition

作者： Ghai, Sartaj S. Amon, Cristina H. Jhon, Myung S. Hsia, Yiao-Tee Department of Chemical Engineering Data Storage Systems Center Carnegie Mellon University Pittsburgh PA 15213 United States Department of Mechanical Engineering Inst. for Complex Engineered Systems Carnegie Mellon University Pittsburgh PA 15213 United States Seagate Research Center Seagate Technology 1251 Waterfront Place Pittsburgh PA 15222 United States

Lattice Boltzmann method (LBM), is used to examine multilength scale, confined heat conduction phenomena in solids for which sub-continuum regime is important This paper describes the implementation of the method and its application to cases pertinent to data storage and electronic devices. Thin solid films with internal heat generation and with temperature difference across the boundaries are used as case studies to illustrate the benefits of the LBM. We compare our results with various hierarchical equations of heat transfer such as Fourier, Cattaneo, and Boltzmann transport equations, as well as with experimental and numerical data from the literature. Our results exhibit a good agreement with other methodologies in one and two dimensions, at a much lower computational effort.

关键词： Data storage equipment

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Sensorless control of induction motors with exponential stability property

Sensorless control of induction motors with exponential stab...

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2003 European Control Conference, ECC 2003

作者： Montanari, Marcello Peresada, Sergei Tilli, Andrea CASY-Center for Research on Complex Automated Systems G. Evangelisti DEIS University of Bologna Viale Risorgimento 2 Bologna40136 Italy Department of Electrical Engineering National Technical University of Ukraine Kiev Politechnical Institute Prospect Pobedy 37 Kiev252056 Ukraine

ISBN: (纸本)9783952417379

In this paper a sensorless controller for induction motor is presented. It provides local exponential stability properties with an explicit estimation of the convergence domain since Lyapunov direct method is adopted in the design/investigation process. Full-order model of the induction motor is considered and no simplifying assumptions on the speed dynamics (as negligibility of the speed time-derivative) are introduced. The load torque is assumed constant but unknown. Simulation results are provided. © 2003 EUCA.

关键词： Lyapunov methods

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engineering students and training in teamwork: How effective?

Engineering students and training in teamwork: How effective...

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2003 ASEE Annual Conference and Exposition: Staying in Tune with engineering Education

作者： Schmidt, Linda Schmidt, Janet Colbeck, Carol Bigio, David Smith, Paige Harper, Lee Uniyersity of Maryland Pennsylvania State University Department of Mechanical Engineering Clark School of Engineering University of Maryland College Park Clark School of Engineering Ctr. for the Stud. of Higher Educ. Pennsylvania State University Department of Mechanical Engineering Clark School of Engineering University of Maryland Women in Engineering Program University of Maryland Institute of Systems Research Clark School of Engineering

The motivating principle of the BESTEAMS (Building engineering Student Team Effectiveness and Management systems) project is to create a modular student team training program that can be integrated into any existing engineering undergraduate curriculum. Funded by a three-year NSF-Course, Curriculum, Laboratory Improvement (CCLI) grant, the BESTEAMS curriculum is comprehensive and developmental, offering three levels of instruction (introductory, intermediate, advanced) in three key areas of team functioning (personal awareness, interpersonal dynamics, and project management). The purpose of this paper is to describe the results of student evaluation of the introductory level curriculum that has been introduced into the Clark School of engineering's - Introduction to engineering Design course (ENES 100). Students completed three team work modules presented by faculty trained in the module delivery during the 2001-2002 academic year. The first Introductory module related to personal effectiveness and increasing self awareness. Using the widely recognized Kolb Learning Style Inventory (LSI), the module shows students how knowing their own preferred learning style can give them insight into themselves as well as their teammates' view of educational and team tasks (N = 379 students). The second Introductory module (interpersonal dynamics) addressed basic communication issues including giving and receiving feedback, typical stages of team development, and brainstorming activities (N = 125 students). The final module on project management, covered personal time management in the context of team projects and included project definition, scoping and the creation of Gantt charts (N = 144 students).

关键词： engineering education

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An active artificial whisker array for texture discrimination

An active artificial whisker array for texture discriminatio...

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IEEE International Workshop on Intelligent Robots and systems (IROS)

作者： M. Fend S. Bovet H. Yokoi R. Pfeifer Artificial Intelligence Laboratory Department of Information Technology University of Zurich Switzerland Research Group of Complex Systems Engineering Graduate School of Engineering Hokkaido University Japan

Whiskers are powerful sensors for robots that are not only useful for basic tasks such as obstacle avoidance, but also have the potential for gathering rich information about objects. We have developed an active multi-whisker array modeled on the rat whisker system which can be amounted on a mobile robot. We show that with this whisker array we can discriminate different textures based on the frequencies elicited by the whiskers. We exploit the phase-locked structure of our data using sensory-motor integration. Two factors enable better discrimination of the textures: firstly, considering several touch events from one whisker; and secondly, combining the information from more than one whisker.

关键词： Tactile sensors Robot sensing systems Animals Rats Power engineering and energy Mobile robots Frequency Navigation Fingers Sensor arrays

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Active research experience for undergraduates increases students' motivation and academic performance

Active research experience for undergraduates increases stud...

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2003 ASEE Annual Conference and Exposition: Staying in Tune with engineering Education

作者： Deek, Fadi Briller, Vladimir Friedman, Robert Durga, Mishra Joshi, Kamal New Jersey Institute of Technology College of Computing Sciences Information Technology Program Information Systems NJIT Outcomes Assessment New Jersey Institute of Technology Undergraduate Programs College of Computing Sciences NJIT Department of Electrical Engineering New Jersey Institute of Technology NJIT Institutional Research Dapartment

An active research experience for undergraduates (REU) was discussed. research experience for undergraduate students provides educational experience through specially designed active research projects. A quasi-experimental design was applied to analyze the impact of REU on academic achievements. Retention rates, cummulative grade point average (GPA) and overall academic persistence measured by ratio of earned and attempted credit hours were also analyzed. Educational outcomes such as obtaining graduate education and employment were measured.

关键词： engineering education

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Human systems integration and shipboard damage control

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NAVAL ENGINEERS JOURNAL 2003年第4期115卷 71-79页

作者： Runnerstrom, E ERIC RUNNERSTROM is an executive engineer at MPR Associates. For the last eight years Mr. Runnerstrom has performed research and development engineering for several of the U.S. Navy 's projects to improve firefighting doctrine and to develop and demonstrate technology for damage control with reduced manning. Mr. Runnerstrom also supported the Program Executive Office for the DD 21 acquisition in the areas of HSI and damage control. Prior to working for MPR Associates Mr. Runnerstrom was an engineering duty officer in the U.S. Navy where some of his work involved ship systems survivability. He worked on the survivability features of the DDG 51 design and he developed the Navy 's deactivation diagram-damage tolerance methodology for assessing the survivability of distributed ship systems. Mr. Runnerstrom holds degrees in naval architecture marine engineering and ocean engineering from Webb Institute of Naval Architecture and from Massachusetts Institute of Technology.

As the United States and other maritime nations move towards operating combatant ships with fewer people, human-systems integration (HSI), or human-centered design, is getting increasing attention in new ship designs. Aboard most ships operating today, damage control is a mostly manual, manpower intensive function. Consequently, it is a key area of concern for ship acquisition programs that need to produce ships that will operate with fewer people. Damage control also is critical to the survival of a warship and the safety of the crew. Consequently, it is very important to ship operators. It is no surprise, therefore, that damage control is a key function of concern when designing new ships to operate with fewer people. This paper discusses the state-of-the-art in HSI and damage control aboard ships today as evidenced by the damage control performance of some of today's ships. The paper draws conclusions about the importance of HSI for effective damage control in new ship designs. The successful application of a human-centered design approach in the development of a damage control supervisory control system for the ***'s Damage Control Automation for Reduced Manning (DC-ARM) program is described. Finally, major challenges to achieving effective HSI in new ship designs are presented.

关键词： Shipbuilding

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