A Simple Analytic 3 Dimensional Downburst Model Based On Boundary Layer Stagnation Flow

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A Simple, Analytic 3-Dimensional Downburst Model Based on Boundary Layer Stagnation Flow

National Aeronautics and Space Administration (NASA)
A Simple Analytic 3 Dimensional Downburst Model Based on Boundary Layer Stagnation Flow Book PDF

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
Page : 34 pages
File Size : 47,8 Mb
Release : 2018-08-10
Category : Electronic
ISBN : 1725043904

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A Simple, Analytic 3-Dimensional Downburst Model Based on Boundary Layer Stagnation Flow by National Aeronautics and Space Administration (NASA) Pdf

A simple downburst model is developed for use in batch and real-time piloted simulation studies of guidance strategies for terminal area transport aircraft operations in wind shear conditions. The model represents an axisymmetric stagnation point flow, based on velocity profiles from the Terminal Area Simulation System (TASS) model developed by Proctor and satisfies the mass continuity equation in cylindrical coordinates. Altitude dependence, including boundary layer effects near the ground, closely matches real-world measurements, as do the increase, peak, and decay of outflow and downflow with increasing distance from the downburst center. Equations for horizontal and vertical winds were derived, and found to be infinitely differentiable, with no singular points existent in the flow field. In addition, a simple relationship exists among the ratio of maximum horizontal to vertical velocities, the downdraft radius, depth of outflow, and altitude of maximum outflow. In use, a microburst can be modeled by specifying four characteristic parameters, velocity components in the x, y and z directions, and the corresponding nine partial derivatives are obtained easily from the velocity equations. Oseguera, Rosa M. and Bowles, Roland L. Langley Research Center NASA-TM-100632, NAS 1.15:100632 RTOP 505-66-41...

The Oxford Handbook of Non-Synoptic Wind Storms

Horia Hangan,Ahsan Kareem
The Oxford Handbook of Non Synoptic Wind Storms Book PDF

Author : Horia Hangan,Ahsan Kareem
Publisher : Oxford University Press
Page : 645 pages
File Size : 40,6 Mb
Release : 2021-08-16
Category : Science
ISBN : 9780190670276

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The Oxford Handbook of Non-Synoptic Wind Storms by Horia Hangan,Ahsan Kareem Pdf

In different areas of the world, much of the damage due to wind is caused by non-synoptic, local wind storm events, such as tornadoes and downbursts. In North America the damage due to these winds is more than 65% of total wind damage, and there are no guidelines or code implementations to deal with such catastrophic events. As we enter the third decade of the twenty-first century, current research is in its first phase of addressing these types of events, from their characterization, simulation, and loading, to collapse-mode effects on buildings and structures, as well as socioeconomic implications. The need is clear to better understand non-synoptic local winds; properly simulate them; assess the difference in loading between these events and synoptic large-scale winds that have been part of the wind engineering practice for more than five decades; determine their statistics and associated risks; and apply this through guidelines, codes, risk mitigation, and adaptation responses to socioeconomic impact. The Oxford Handbook of Non-Synoptic Wind Storms, led by Dr. Horia Hangan and Dr. Ahsan Kareem, features nearly 30 chapters, contributed by an international panel of leading scientists, scholars, and engineers, that address these issues and stimulate thought, research, and responses to non-synoptic wind storm hazards in North America and worldwide. Together, these articles provide clear definitions of the problems to be tackled, offer a strategic framework for forward-looking research, identify the best-suited tools and methodologies to address the problems at hand, and suggest ways to maximize collaborative planning between the disciplines that will tackle these challenges.

Wind Loading of Structures

John D. Holmes,Seifu Bekele
Wind Loading of Structures Book PDF

Author : John D. Holmes,Seifu Bekele
Publisher : CRC Press
Page : 618 pages
File Size : 48,9 Mb
Release : 2020-12-08
Category : Technology & Engineering
ISBN : 9781000220759

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Wind Loading of Structures by John D. Holmes,Seifu Bekele Pdf

Wind forces from extreme wind events are the dominant loading for many parts of the world, exacerbated by climate change and the continued construction of tall buildings and structures. This authoritative source, for practising and academic structural engineers and graduate students, ties the principles of wind loads on structures to the relevant aspects of meteorology, bluff-body aerodynamics, probability and statistics, and structural dynamics. This new edition covers: Climate change effects on extreme winds – particularly those from tropical cyclones, hurricanes and typhoons Modelling of potential wind vulnerability and damage Developments in extreme value probability analysis of extreme wind speeds and directions Explanation of the difference between ‘return period’ and ‘average recurrence interval’, as well as ‘bootstrapping’ techniques for deriving confidence limits Wind over water, and profiles and turbulence in non-synoptic winds An expanded chapter on internal pressures produced by wind for various opening and permeability scenarios Aerodynamic shaping of high- and low-rise buildings Recent developments in five major wind codes and standards A new chapter on computational fluid dynamics (CFD), as applied to wind engineering A greatly expanded appendix providing the basic information on extreme wind climates for over 140 countries and territories Additional examples for many chapters in this book

Scientific and Technical Aerospace Reports

Anonim
Scientific and Technical Aerospace Reports Book PDF

Author : Anonim
Publisher : Unknown
Page : 720 pages
File Size : 40,7 Mb
Release : 1988
Category : Aeronautics
ISBN : UOM:39015034725153

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Scientific and Technical Aerospace Reports by Anonim Pdf

Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

American Environmentalism

J. Michael Martinez
American Environmentalism Book PDF

Author : J. Michael Martinez
Publisher : CRC Press
Page : 1227 pages
File Size : 44,7 Mb
Release : 2013-06-20
Category : Law
ISBN : 9780415633185

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American Environmentalism by J. Michael Martinez Pdf

Protecting the natural environment and promoting sustainability have become important objectives, but achieving such goals presents myriad challenges for even the most committed environmentalist. American Environmentalism: Philosophy, History, and Public Policy examines whether competing interests can be reconciled while developing consistent, coherent, effective public policy to regulate uses and protection of the natural environment without destroying the national economy. It then reviews a range of possible solutions. The book delves into key normative concepts that undergird American perspectives on nature by providing an overview of philosophical concepts found in the western intellectual tradition, the presuppositions inherent in neoclassical economics, and anthropocentric (human-centered) and biocentric (earth-centered) positions on sustainability. It traces the evolution of attitudes about nature from the time of the Ancient Greeks through Europeans in the Middle Ages and the Renaissance, the Enlightenment and the American Founders, the nineteenth and twentieth centuries, and up to the present. Building on this foundation, the author examines the political landscape as non-governmental organizations (NGOs), industry leaders, and government officials struggle to balance industrial development with environmental concerns. Outrageous claims, silly misrepresentations, bogus arguments, absurd contentions, and overblown prophesies of impending calamities are bandied about by many parties on all sides of the debate—industry spokespeople, elected representatives, unelected regulators, concerned citizens, and environmental NGOs alike. In lieu of descending into this morass, the author circumvents the silliness to explore the crucial issues through a more focused, disciplined approach. Rather than engage in acrimonious debate over minutiae, as so often occurs in the context of "green" claims, he recasts the issue in a way that provides a cohesive look at all sides. This effort may be quixotic, but how else to cut the Gordian knot?

Advanced Structural Wind Engineering

Yukio Tamura,Ahsan Kareem
Advanced Structural Wind Engineering Book PDF

Author : Yukio Tamura,Ahsan Kareem
Publisher : Springer Science & Business Media
Page : 410 pages
File Size : 40,5 Mb
Release : 2013-07-19
Category : Science
ISBN : 9784431543374

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Advanced Structural Wind Engineering by Yukio Tamura,Ahsan Kareem Pdf

This book serves as a textbook for advanced courses as it introduces state-of-the-art information and the latest research results on diverse problems in the structural wind engineering field. The topics include wind climates, design wind speed estimation, bluff body aerodynamics and applications, wind-induced building responses, wind, gust factor approach, wind loads on components and cladding, debris impacts, wind loading codes and standards, computational tools and computational fluid dynamics techniques, habitability to building vibrations, damping in buildings, and suppression of wind-induced vibrations. Graduate students and expert engineers will find the book especially interesting and relevant to their research and work.

Energy and Exergy for Sustainable and Clean Environment, Volume 2

V. Edwin Geo,Fethi Aloui
Energy and Exergy for Sustainable and Clean Environment Volume 2 Book PDF

Author : V. Edwin Geo,Fethi Aloui
Publisher : Springer Nature
Page : 531 pages
File Size : 42,6 Mb
Release : 2022-09-19
Category : Business & Economics
ISBN : 9789811682742

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Energy and Exergy for Sustainable and Clean Environment, Volume 2 by V. Edwin Geo,Fethi Aloui Pdf

This multi-disciplinary book presents the most recent advances in exergy, energy, and environmental issues. Volume 2 focuses on fundamentals in the field and covers current problems, future needs, and prospects in the area of energy and environment from researchers worldwide. Based on some selected lectures from the Eleventh International Exergy, Energy and Environmental Symposium (IEEES-11) and complemented by further invited contributions, this comprehensive set of contributions promote the exchange of new ideas and techniques in energy conversion and conservation in order to exchange best practices in "energetic efficiency." Included are fundamental and historical coverage of the green transportation and sustainable mobility sectors, especially regarding the development of sustainable technologies for thermal comforts and green transportation vehicles. Furthermore, contributions on renewable and sustainable energy sources, strategies for energy production, and the carbon-free society constitute an important part of this book.

Proceedings of the XV Conference of the Italian Association for Wind Engineering

Francesco Ricciardelli,Alberto Maria Avossa
Proceedings of the XV Conference of the Italian Association for Wind Engineering Book PDF

Author : Francesco Ricciardelli,Alberto Maria Avossa
Publisher : Springer
Page : 755 pages
File Size : 42,7 Mb
Release : 2019-03-12
Category : Science
ISBN : 9783030128159

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Proceedings of the XV Conference of the Italian Association for Wind Engineering by Francesco Ricciardelli,Alberto Maria Avossa Pdf

This volume gathers the latest advances, innovations, and applications in the field of wind engineering, as presented by leading international researchers and engineers at the XV Conference of the Italian Association for Wind Engineering (IN-VENTO 2018), held in Naples, Italy on September 9-12, 2018. It covers highly diverse topics, including aeroelasticity, bluff-body aerodynamics, boundary layer wind tunnel testing, computational wind engineering, structural dynamics and reliability, wind-structure interaction, flow-induced vibrations, wind modeling and forecast, wind disaster mitigation, and wind climate assessment. The contributions, which were selected by means of a rigorous international peer-review process, highlight numerous exciting ideas that will spur novel research directions and foster multidisciplinary collaboration among different specialists.

Fuzzy Algorithms for Control

H. B. Verbruggen,Hans-Jürgen Zimmermann,Robert Babuška
Fuzzy Algorithms for Control Book PDF

Author : H. B. Verbruggen,Hans-Jürgen Zimmermann,Robert Babuška
Publisher : Springer Science & Business Media
Page : 353 pages
File Size : 42,9 Mb
Release : 2013-03-09
Category : Mathematics
ISBN : 9789401144056

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Fuzzy Algorithms for Control by H. B. Verbruggen,Hans-Jürgen Zimmermann,Robert Babuška Pdf

Fuzzy Algorithms for Control gives an overview of the research results of a number of European research groups that are active and play a leading role in the field of fuzzy modeling and control. It contains 12 chapters divided into three parts. Chapters in the first part address the position of fuzzy systems in control engineering and in the AI community. State-of-the-art surveys on fuzzy modeling and control are presented along with a critical assessment of the role of these methodologists in control engineering. The second part is concerned with several analysis and design issues in fuzzy control systems. The analytical issues addressed include the algebraic representation of fuzzy models of different types, their approximation properties, and stability analysis of fuzzy control systems. Several design aspects are addressed, including performance specification for control systems in a fuzzy decision-making framework and complexity reduction in multivariable fuzzy systems. In the third part of the book, a number of applications of fuzzy control are presented. It is shown that fuzzy control in combination with other techniques such as fuzzy data analysis is an effective approach to the control of modern processes which present many challenges for the design of control systems. One has to cope with problems such as process nonlinearity, time-varying characteristics for incomplete process knowledge. Examples of real-world industrial applications presented in this book are a blast furnace, a lime kiln and a solar plant. Other examples of challenging problems in which fuzzy logic plays an important role and which are included in this book are mobile robotics and aircraft control. The aim of this book is to address both theoretical and practical subjects in a balanced way. It will therefore be useful for readers from the academic world and also from industry who want to apply fuzzy control in practice.

Wind Energy Engineering

Trevor Letcher
Wind Energy Engineering Book PDF

Author : Trevor Letcher
Publisher : Elsevier
Page : 588 pages
File Size : 45,8 Mb
Release : 2023-05-08
Category : Technology & Engineering
ISBN : 9780323958301

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Wind Energy Engineering by Trevor Letcher Pdf

Wind Energy Engineering: A Handbook for Onshore and Offshore Wind Turbines, Second Edition continues to be the most advanced, up-to-date and research-focused text on all aspects of wind energy engineering. Covering a wider spectrum of topics in the field of wind turbines (offshore and onshore), this new edition includes new intelligent turbine designs and optimization, current challenges and efficiencies, remote sensing and smart monitoring, and key areas of advancement, such as floating wind turbines. Each chapter includes a research overview with a detailed analysis and new case studies looking at how recent research developments can be applied. Written by some of the most forward-thinking professionals in the field, and giving a complete examination of one of the most promising and efficient sources of renewable energy, this book is an invaluable reference into this cross-disciplinary field for engineers. Offers an all-around understanding of the links between worldwide resources, including wind turbine technology, electricity and environmental issues, and economics Provide the very latest research and development in over 33 fields of endeavor related to wind power Includes extensive sets of references in each chapter, giving readers all the very latest thinking and information on each topic