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The Near-minimum-time Control of Open-loop Articulated Kinematic Chains by Michael Edwin Kahn Pdf
The time-optimal control of a system of rigid bodies connected in series by single-degree-of-freedom joints is studied. The dynamical equations of the system are highly nonlinear and a closed-form representation of the minimum-time feedback control is not possible. However, a suboptimal feedback control which provides a close approximation to the optimal control is developed. The suboptimal control is expressed in terms of switching curves for each of the system controls. These curves are obtained from the linearized equations of motion for the system. Approximations are made for the effects of gravity loads and angular velocity terms in the nonlinear equations of motion. Digital simulation is used to obtain a comparison of response of the optimal and suboptimal controls. The speed of response of the suboptimal control is found to compare quite favorably with the response speed of the optimal control. The analysis is applied to the control of three joints of a mechanical manipulator. Modifications of the suboptimal control for use in a sampled-data system are shown to result in good performance of a hydraulic manipulator under computer control. (Author).
Investigation of Lateral Control Near the Stall by Fred E. Weick Pdf
Flight tests were made with a typical light airplane to investigate possibilities for obtaining reliable control at low flight speeds. It was found that satisfactory lateral control occurred consistently, even under conditions simulating extremely gusty air, at angles of attack approximately 2 degrees below that for the maximum lift coefficient (or the stall of the wing as a whole). This 2 degree margine was substantially the same both with full power and with the engine throttled and throughout the range of center-of-gravity locations tested. Supplementary tests were then made on the control at high angles of attack under actual gusty air conditions, on the possibility of entering spins, and on the amount of elevator control required for normal three-point landings. It was found that with the original plain untwisted wing obtaining the constant 2 degree margin below the stall required widely different elevator deflections for the range of power and center-of-gravity locations tested. Also, none of these settings ws high enough to produce a three-point landing.
Investigation of Lateral Control Near the Stall Flight Tests with High-wing and Low-wing Monoplanes of Various Configurations by Fred E. Weick,H. Norman Abramson Pdf
These results are intended to provide quantitative flight-test information which may be useful to designers in attempting to provide for adequate low-speed control and which may be correlated with analytical analyses as presented in the third and finai report in this series (Technical Note 3677).
National Research Council,Division on Engineering and Physical Sciences,National Materials Advisory Board,Commission on Engineering and Technical Systems,Committee on Aging of U.S. Air Force Aircraft
Author : National Research Council,Division on Engineering and Physical Sciences,National Materials Advisory Board,Commission on Engineering and Technical Systems,Committee on Aging of U.S. Air Force Aircraft Publisher : National Academies Press Page : 125 pages File Size : 44,7 Mb Release : 1997-10-30 Category : Technology & Engineering ISBN : 9780309059350
Aging of U.S. Air Force Aircraft by National Research Council,Division on Engineering and Physical Sciences,National Materials Advisory Board,Commission on Engineering and Technical Systems,Committee on Aging of U.S. Air Force Aircraft Pdf
Many of the aircraft that form the backbone of the U.S. Air Force operational fleet are 25 years old or older. A few of these will be replaced with new aircraft, but many are expected to remain in service an additional 25 years or more. This book provides a strategy to address the technical needs and priorities associated with the Air Force's aging airframe structures. It includes a detailed summary of the structural status of the aging force, identification of key technical issues, recommendations for near-term engineering and management actions, and prioritized near-term and long-term research recommendations.
Textbook of Diabetes and Pregnancy by Moshe Hod,Gian Carlo Di Renzo,Lois G. Jovanovic,Alberto De Leiva,Oded Langer Pdf
Babies of women with diabetes are nearly five times more likely to be stillborn and almost three times more likely to die in the first three months. The incidence of gestational diabetes mellitus in the U.S. is high—between 3 and 7 percent—and rising. The condition is often complicated by other risk factors such as obesity and heart disease. The Textbook of Diabetes and Pregnancy presents a comprehensive review of the science, clinical management, and medical implications of gestational diabetes mellitus, a condition with serious consequences that is on the increase in all developed societies. This new edition supports the latest initiatives and strategies of the International Federation of Gynecology and Obstetrics (FIGO) and adds chapters on noncommunicable diseases, obesity, bariatric surgery, and epidemiology outside Western cultures. Written by a cadre of experts, the book provides a comprehensive, authoritative, and international view of gestational diabetes mellitus and will be invaluable to maternal-fetal medicine specialists, diabetologists, neonatologists, and a growing number of gynecologists and general physicians concerned with the management of noncommunicable diseases in pregnancy.
American Institute of Mining, Metallurgical, and Petroleum Engineers. Iron and Steel Division. Committee on Physical Chemistry of Steelmaking
Author : American Institute of Mining, Metallurgical, and Petroleum Engineers. Iron and Steel Division. Committee on Physical Chemistry of Steelmaking Publisher : Unknown Page : 664 pages File Size : 45,5 Mb Release : 1944 Category : Chemistry, Metallurgic ISBN : WISC:89074784836
Basic Open Hearth Steelmaking by American Institute of Mining, Metallurgical, and Petroleum Engineers. Iron and Steel Division. Committee on Physical Chemistry of Steelmaking Pdf
International Review of Cell and Molecular Biology by Anonim Pdf
International Review of Cell and Molecular Biology presents comprehensive reviews and current advances in cell and molecular biology. The series has a worldwide readership, maintaining a high standard by publishing invited articles on important and timely topics authored by prominent cell and molecular biologists. Provides comprehensive reviews and current advances Presents a wide range of perspectives on specific subjects Contains valuable reference material for advanced undergraduates, graduate students, and professional scientists
The Oscar-shortlisted documentary Command and Control, directed by Robert Kenner, finds its origins in Eric Schlosser's book and continues to explore the little-known history of the management and safety concerns of America's nuclear aresenal. “Deeply reported, deeply frightening . . . a techno-thriller of the first order.” —Los Angeles Times “A devastatingly lucid and detailed new history of nuclear weapons in the U.S. . . . fascinating.” —Lev Grossman, TIME Magazine A myth-shattering exposé of America’s nuclear weapons Famed investigative journalist Eric Schlosser digs deep to uncover secrets about the management of America’s nuclear arsenal. A groundbreaking account of accidents, near misses, extraordinary heroism, and technological breakthroughs, Command and Control explores the dilemma that has existed since the dawn of the nuclear age: How do you deploy weapons of mass destruction without being destroyed by them? That question has never been resolved—and Schlosser reveals how the combination of human fallibility and technological complexity still poses a grave risk to mankind. While the harms of global warming increasingly dominate the news, the equally dangerous yet more immediate threat of nuclear weapons has been largely forgotten. Written with the vibrancy of a first-rate thriller, Command and Control interweaves the minute-by-minute story of an accident at a nuclear missile silo in rural Arkansas with a historical narrative that spans more than fifty years. It depicts the urgent effort by American scientists, policy makers, and military officers to ensure that nuclear weapons can’t be stolen, sabotaged, used without permission, or detonated inadvertently. Schlosser also looks at the Cold War from a new perspective, offering history from the ground up, telling the stories of bomber pilots, missile commanders, maintenance crews, and other ordinary servicemen who risked their lives to avert a nuclear holocaust. At the heart of the book lies the struggle, amid the rolling hills and small farms of Damascus, Arkansas, to prevent the explosion of a ballistic missile carrying the most powerful nuclear warhead ever built by the United States. Drawing on recently declassified documents and interviews with people who designed and routinely handled nuclear weapons, Command and Control takes readers into a terrifying but fascinating world that, until now, has been largely hidden from view. Through the details of a single accident, Schlosser illustrates how an unlikely event can become unavoidable, how small risks can have terrible consequences, and how the most brilliant minds in the nation can only provide us with an illusion of control. Audacious, gripping, and unforgettable, Command and Control is a tour de force of investigative journalism, an eye-opening look at the dangers of America’s nuclear age.
Wireless Sensor Networks by Ibrahiem M. M. El Emary,S. Ramakrishnan Pdf
Although there are many books available on WSNs, most are low-level, introductory books. The few available for advanced readers fail to convey the breadth of knowledge required for those aiming to develop next-generation solutions for WSNs.Filling this void, Wireless Sensor Networks: From Theory to Applications supplies comprehensive coverage of WS
SIAM Journal on Control and Optimization by Society for Industrial and Applied Mathematics Pdf
Contains research articles on the mathematics and applications of control theory and on those parts of optimization theory concerned with the dynamics of deterministic or stochastic systems in continuous or discrete time or otherwise dealing with differential equations, dynamics, infinite-dimensional spaces, or fundamental issues in variational analysis and geometry.
