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AAS/AIAA Astrodynamics Specialist Conference, 2019

作者： Roelke, Evan Hattis, Phil D. Braun, R.D. The Charles Stark Draper Laboratory Inc. Graduate Research Assistant Entry systems Design Lab Colorado Center for Astrodynamics Research 1111 Engineering Drive BoulderCO80309 United States The Charles Stark Draper Laboratory Inc 555 Technology Square CambridgeMA02139 United States Smead Professor of Space Technology Dean of Engineering and Applied Science 1111 Engineering Drive BoulderCO80309 United States

ISBN: (纸本)9780877036654

Increased interest in Lunar or Mars-sample return missions encourages consideration of innovative orbital operations such as aerocapture, which generally provides significant mass-savings for orbital insertion at Earth or Mars. Drag modulation architectures offer a straightforward approach to orbital apoapsis targeting by enabling ballistic entry, among other benefits. A shortcoming of these architectures is the poor estimation of atmospheric density resulting in target apoapsis altitude errors. This research seeks to assess and improve upon current atmospheric density estimation techniques in order to support the flight viability of discrete event drag modulated aerocapture. Three different estimation techniques are assessed in terms of estimation error and apoapsis altitude error: a static density factor, a density array interpolator, and an ensemble correlation filter. The density interpolator achieves a 5% improvement in median apoapsis altitude over the density factor when entering at –5.9° and targeting a 2000km apoapsis altitude, while the ensemble correlation filter achieves a 7% improvement under identical simulation conditions. The ensemble correlation filter was found to improve with decreasing density search tolerance, achieving a 4:6% improvement in median apoapsis altitude for a tolerance of 1% over 5%. These improvements are dependent on entry and vehicle parameters and improve as the entry angle becomes more shallow or the target apoapsis is reduced. Errors in the density factor measurements are main contributors to the error in estimated versus true density profiles. © 2020, Univelt Inc. All rights reserved.

关键词： Errors

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Join the Fold: Video Games, Science Fiction, and the Refolding of Citizen Science

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design ISSUES 2023年第1期39卷 70-87页

作者： Milburn, Colin Buse, Katherine Dhaliwal, Ranjodh Singh Wills, Melissa Aldosari, Raida Camarador, Patrick Miller, Josh Aaron Siegel, Justin Colin Milburn is Gary Snyder Chair in Science and the Humanities and a professor of Science and Technology Studies English and Cinema and Digital Media at the University of California Davis. His research focuses on science literature and media technologies. His books include Nanovision: Engineering the Future (2008) Mondo Nano: Fun and Games in the World of Digital Matter (2015) and Respawn: Gamers Hackers and Technogenic Life (2015). Katherine Buse is an assistant professor of Media Studies at the University of Chicago. Her research focuses on digital media the environmental humanities and the cultures of science and technology. Her current book project Speculative Planetology: Science Culture and the Building of Model Worlds tells the story of how the sciences and the arts co-constructed a toolkit for thinking about planets as whole systems. Ranjodh Singh Dhaliwal is Ruth and Paul Idzik College Chair in Digital Scholarship and an assistant professor of English and Film Television and Theatre at the University of Notre Dame. His work spans media theory science and technology studies and literary criticism. His current book project Rendering: A Political Diagrammatology of Computation shows how our cultural politico-economic and epistemic formulations crystallize into hardware and software architectures. Melissa Wills is a visiting scholar in the Department of Science and Technology Studies at the University of California Davis. She completed her PhD in English at UC Davis in 2021. Her research addresses the relationship between the life sciences and science fiction. Her current book project Ruptures: Life without Germs in the Microbiome Era examines microbiology's debt to the imagination of germ-free worlds. Raida Aldosari is the lead artist on the Foldit: First Contact development team. She received her BS in Nutrition Science from the University of California Davis in 2018. She has experience as a freelance graphic designer and as a project manager for nutrition training and courses.

This article explores the value of science fiction narratives in games for citizen science. Focusing on the protein-folding game Foldit, it describes the process of modifying and redesigning the game to feature a framing narrative and other alterations to the main tutorial campaign. The campaign narrative, Foldit: First Contact, situates the practices of citizen science in an expanded context of meanings and ethical implications, promoting critical self-reflection on the relations of science and civic values. A study of player responses to Foldit: First Contact suggests the significance of science fiction and critical game design for attuning citizen scientists to the collective responsibilities of experimentation and innovation, drawing attention to the intersecting social, technical, and environmental domains in which gamers may contribute to scientific research.

关键词： citizen science science fiction video games narratives

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Comparison between CMOS full adder and PTL full adder

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IOP Conference Series: Materials Science and engineering 2021年第1期1065卷

作者： M Amitha Deepa Master of Technology in VLSI Design and Embedded Systems Dept. of Electronics and Instrumentation Engineering Siddaganga Institute of Technology Tumakuru Assistant Professor Dept. of Electronics and Instrumentation Engineering Siddaganga Institute of Technology Tumakuru

In electronic industry the level of integration is an important aspect as makes the electronic device simpler and more reliable. The device density increases with the better level of integration. Power dissipation, area occupied and delay are some of the important factors that need to be considered. These parameters play a vital role in manufacturing portable electronic gadgets. designing of full adder using conventional CMOS design and PTL has been shown in this paper. A comparison is made between the two designs with respect to power dissipation, delay and area (number of transistors). Mentor Graphics Tool is used in design and simulation of the full adder. The PTL full adder has a smaller number of transistors and lower power dissipation compared to CMOS full adder. With all the comparison made it will be concluded that the PTL full adder performance is better than the CMOS full adder.

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Fluid structure interaction simulations and experimental validation of a pipeline immersed in liquid

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Journal of Physics: Conference Series 2019年第1期1355卷

作者： Kumaresan, D Lekshmi, A Kodati Srinivas Suresh Mathew Thomas Sruthy, S Scientist/Engineer Structural Analysis Division Mechanical Design and Analysis Entity Liquid Propulsion Systems Centre ISRO Valiamala Thiruvananthapuram-695 547 India Graduate Student Department of Civil Engineering Amrita School of Engineering Coimbatore India Head Slosh Studies Division Mechanical Design and Analysis Entity Liquid Propulsion Systems Centre ISRO Valiamala Thiruvananthapuram-695 547 India Head Structural Mechanics and Analysis Group Mechanical Design and Analysis Entity Liquid Propulsion Systems Centre ISRO Valiamala Thiruvananthapuram-695 547 India Assistant Professor Department of Civil Engineering Amrita School of Engineering Coimbatore India

In launch vehicles, there are number of fluid systems to cater to various requirements like propellant filling, draining to/from tanks, venting of ullage gases, pressurization of the tanks, feed systems to convey propellants to engine from tanks, lines to convey command gas to actuate various valves etc. These pipe lines are subjected to environmental loads i.e. vibration loads when the launch vehicle starts its course to place the satellite into its designated orbit. It is essential to study the dynamic characteristics of these pipe lines for the design of them for vibration loads. The response of these pipelines depends on fluid environment in which they are immersed. If a pipe line is immersed in liquid, its dynamic characteristics vary largely from that of a pipeline vibrating in ambient environment (air). If the pipe line immersed in fluid, natural frequency reduces and damping increases due to the added mass and fluid viscosity respectively. In order to study these effects, FSI studies are carried out on a pipe line immersed in water using ANSYS CFD and Mechanical software. Convergence studies with respect to time scale are carried out to benchmark the simulation procedure. This simulation procedure is validated by conducting the experiments.

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Keep Your Friends Close and Your Colleagues Nearby: The Hidden Ties That Improve STEM Education

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Change 2019年第1期51卷 42页

作者： Mestre, Jose P. Herman, Geoffrey L. Tomkin, Jonathan H. West, Matthew Jose P. Mestre (mestre@illinois.edu). A theoretical nuclear physicist by training Mestre’s research focuses on the learning of physics contributing in areas such as the acquisition and use of knowledge by experts and novices transfer of learning problem solving and instructional design. He has offered Congressional testimony on The Science of Learning has published numerous articles and books and is a Fellow of the American Physical Society.http://***/0000-0003-2110-1954 Geoffrey L. Herman (glherman@illinois.edu). Herman has a Ph.D. in Electrical and Computer Engineering and is a Teaching Assistant Professor in Computer Science and a Research Assistant Professor in the Department of Curriculum & Instruction at the University of Illinois. His research focuses on how students learn engineering and computing concepts and studying processes for creating systemic instructional change in college settings. Previously he was a postdoctoral researcher in Engineering Education at Purdue University.http://***/0000-0002-9501-2295 Jonathan H. Tomkin (tomkin@illinois.edu). Tomkin is a mathematically based geoscientist with two research focus areas: first he uses models and large data sets to determine how climates glaciers tectonics and landscapes interact. Second he explores how new technological and organizational approaches can improve STEM education. He produced the first geoscience MOOC is the editor of an open-source textbook and has published widely in both geoscience and STEM education. Matthew West (mwest@illinois.edu). Matthew West is an Associate Professor of Mechanical Science and Engineering at the University of Illinois with research interests in scientific computing that include time integration of deterministic and stochastic systems distributed computation and particle methods for simulation and estimation. In education he researches computer-based assessment and the development of innovative teaching cultures. Professor West is a University of Illinois Distinguished Teacher-Scholar and Colleg

A science department on the campus of the University of Illinois has received numerous national awards for excellence in undergraduate teaching. The secret to their success? For nearly two decades, they have collaboratively used evidence-based instructional practices (EBIP) in their introductory level courses. Despite these successes and efforts to spread their EBIP, no other departments followed this department's lead. Then, suddenly six years ago, many instructors from other departments began adopting EBIP in their classrooms. This article asks what was the catalyst for this change? Why had previous attempts at institutional change failed? The authors answer these questions by analyzing their efforts to transform the teaching practices in large-enrollment science and engineering introductory courses on their campus.

关键词： STEM Education Evidence Based Practice Teaching Methods Undergraduate Study College Faculty Educational Change Communities of Practice Mentors School CultureIllinois

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A comparative analysis of route-based power management strategies for real-time application in plug-in hybrid electric vehicles

A comparative analysis of route-based power management strat...

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American Control Conference

作者： Mahyar Vajedi Amir Taghavipour Nasser L. Azad John McPhee PHD candidate in Systems Design Engineering University of Waterloo ON Canada Assistant Professor in Systems Design Engineering University of Waterloo ON Canada Professor in Systems Design Engineering University of Waterloo ON Canada

ISBN: (纸本)9781479932757

Plug-in hybrid electric vehicles (PHEVs) are promising alternatives for sustainable transportation. Because of their embedded battery pack, they can significantly enhance the fuel economy compared to conventional vehicle. Improving the power management strategy can exploit the full potential of a PHEV powertrain and reduce the fuel consumption considerably. In this study, we compare two outstanding optimal route-based control approaches: model predictive control (MPC) and adaptive equivalent consumption minimization strategy (AECMS), for different levels of trip information. The controllers are fine-tuned for the 2013 Toyota Prius plug-in hybrid and implemented as a high-fidelity model in Autonomie software. To evaluate the designed control systems, the rule-based controller of Autonomie is considered as a benchmark power management system. The result of simulations show that MPC and A-ECMS lead to an approximately equal fuel economy, and they can improve the fuel consumption of this PHEV up to 10% in comparison to the benchmark controller. Both strategies can be implemented in real-time although A-ECMS is 15% faster than MPC.

关键词： PHEV MPC ECMS

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Modeling Business Models

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design ISSUES 2014年第4期30卷 67-82页

作者： Simonse, Lianne Lianne Simonse leads two research programs Designing Business Models for Home Healthcare and Design Roadmapping at the faculty of Industrial Design Engineering Delft University of Technology the Netherlands. These programs focus on contributing to the collective learning and body of knowledge of scholars and practitioners in strategic product design. Her 20 years of strategic design experience includes ventures networks and multinationals. She has a PhD in socio-technical systems design followed by assistant professor positions in innovation- and design management. She teaches at the Strategic Product Design master e.a. the courses “Strategic Product Design Research” and “Design Roadmapping.

The article discusses business model design and the modeling methods used by designers to combine strategy and design concepts when creating a business model. Topics include how the profit formula, or price-model, factor into social services business model designs such as the model for Frog, a community health services project through UNICEF, business model considerations for electronic commerce (e-commerce) business, and how design business models incorporate computer-aided sketches of design solutions.

关键词： BUSINESS models design -- Marketing PROFITABILITY SOCIAL services ELECTRONIC commerce COMPUTER graphics

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Don't Make Art, Do Industrial design: A Voice from Industry

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design Management Review 2014年第1期25卷

作者： KwanMyung Kim Kun‐Pyo Lee Finishing his Ph.D. research in Industrial Design at KAIST while serving as an assistant professor in the School of Design and Human Engineering at UNIST (Ulsan National Institute Science and Technology) Korea. He received a BSc and MSc and completed a PhD course in industrial design from Korea Advanced Institute of Science and Technology (KAIST) in 1992 1994 and 2010 respectively. He has a strong practical background stretching from design to engineering to business having been involved in developing products and machine systems for 13 years as a product designer design engineer and founder of a venture company. As a researcher and practitioner he is interested in integrating design and engineering knowledge for design‐driven product and product‐service innovation. Professor in the department of industrial design at KAIST and the director of its Human Centered Interaction Design Lab. He also serves as president of the International Association of Societies of Design Research. Lee was the executive vice president and head of the corporate design center for LG Electronics and has worked on various research projects with many of the world's leading companies and organizations such as LG Electronics Samsung Electronics Johnson and Johnson and Volkswagen as well as for government organizations. He has served on the advisory boards of several organizations and journals in Korea and abroad.

Industrial designers and engineering designers: Can't we all just get along? Unfortunately, when push comes to shove, it's engineering that tends to win. How can schools better prepare industrial designers for the work force? engineering designers and industrial designers would get along much better if they shared common knowledge and common goals—long before they reached the workplace.

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The Mimo Predictive Pid Controller design

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Asian Journal of Control 2008年第4期4卷

作者： M.H. Moradi M.R. Katebi M.A. Johnson Department of Electronic and Electrical Engineering University of Strath-clyde Glasgow GI 1QE UK. Dr. Moradi is a Lecturer in the Department of Electronic and Electrical Engineering University of Bu-Ali Sina in Iran. He obtained the BSc and MSc in 1991 and 1993 from the Sharif University of Technology and Tarbiat Modarres University respectively. Dr. Moradi joined the Bu-Ali Sina University in 1993. In 2002 he obtained his PhD degree from the University of Strath-clyde Glasgow Scotland. His theoretical research interests include predictive PID control advanced classical control generalised predictive control system identification and fault monitoring robust control design computer networks and more recently control through networks. His industrial interests are in the areas of large-scale systems especially power systems and power plant modelling and control supervisory control and process control. Dr. Moradi has published a number of Journal and Conference papers. Dr. Katebi is a senior lecturer in the Department of Electronic and Electrical Engineering University of Strathclyde. His theoretical research interests are currently focused on Non-linear Control and Filtering for Complex Systems Autonomous Control Design System integration and Fault monitoring and Reconfiguration Plant Monitoring through the Internet Discrete Event Simulation Process Optimisation and Robust Control Design. The industrial research interests are in the area of Hot and Rolling for Steel and Aluminium Power Plant Modelling and Control Marine Control Systems Process Control and Wastewater Treatment Control. Dr Katebi is the author/co-author of four books and more than 150 papers and industrial reports. Professor Johnson's academic education began at Coventry University (1969) and continued under the supervision of Professor Greyham Bryant in the field of Control Systems at Imperial College London. He obtained the DIC MSc and PhD from Imperial College leaving for industry in 1978. Subsequent experience was in the

This paper is concerned with the design of Multi-Inputs and Multi-Outputs (MIMO) predictive PID controllers, which have similar performance to that obtainable from model-based predictive controllers. A new PID control structure is defined which incorporates the prediction of future outputs and uses future set point. A method is proposed to calculate the optimal values of the PID gains from generalised predictive control results. A decentralized version of the predictive PID controllers is presented and the stability of the closed loop system is studied. Simulation studies demonstrate the superior performance of the proposed controller compared with a conventional PID controller. The results are also compared with generalised predictive control solutions.

关键词： PID control design predictive PID MIMO controller optimisation

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TRACKING CONTROL IN THE PRESENCE OF NONLINEAR DYNAMIC FRICTIONAL EFFECTS: ROBOT EXTENSION

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Asian Journal of Control 2008年第3期1卷

作者： M. Feemster D.M. Dawson A. Behal W. Dixon Matthew Feemster received the B.S degree in Electrical Engineering from Clemson University Clemson South Carolina in December 1994. Upon graduation he remained at Clemson University and received the M.S. degree in Electrical Engineering in 1997. During this time he also served as a research/teaching assistant. His research work focused on the design and implementation of various nonlinear control algorithms with emphasis on the induction motor and mechanical systems with friction present. He is currently working toward his Ph.D. degree in Electrical Engineering at Clemson University. Darren M. Dawson was born in 1962 in Macon Georgia. He received an Associate Degree in Mathematics from Macon Junior College in 1982 and a B.S. Degree in Electrical Engineering from the Georgia Institute of Technology in 1984. He then worked for Westinghouse as a control engineer from 1985 to 1987. In 1987 he returned to the Georgia Institute of Technology where he received the Ph.D. Degree in Electrical Engineering in March 1990. During this time he also served as a research/teaching assistant. In July 1990 he joined the Electrical and Computer Engineering Department and the Center for Advanced Manufacturing (CAM) at Clemson University where he currently holds the position of Professor. Under the CAM director's supervision he currently leads the Robotics and Manufacturing Automation Laboratory which is jointly operated by the Electrical and Mechanical Engineering departments. His main research interests are in the fields of nonlinear based robust adaptive and learning control with application to electro-mechanical systems including robot manipulators motor drives magnetic bearings flexible cables flexible beams and high-speed transport systems. Aman Behal was born in India in 1973. He received his Masters Degree in Electrical Engineering from Indian Institute of Technology Bombay in 1996. He is currently working towards a Ph.D in Controls and Robotics at Clemson University. His research focuses on the control of no

In this paper, we extend the observer/control strategies previously published in [25] to an n -link, serially connected, direct drive, rigid link, revolute robot operating in the presence of nonlinear friction effects modeled by the Lu-Gre model. In addition, we also present a new adaptive control technique for compensating for the nonlinear parameterizable Stribeck effects. Specifically, an adaptive observer/controller scheme is developed which contains a feedforward approximation of the Stribeck effects. This feedforward approximation is used in a composite controller/observer strategy which forces the average square integral of the position tracking error to an arbitrarily small value. Experimental results are included to illustrate the performance of the proposed controllers.

关键词： Friction compensation nonlinear control

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