propeller and rotor aeroacoustics for urban air mobility applications

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Government Reports Announcements & Index
Author : N.A
Publisher : N.A
Release Date : 1984
ISBN 10 :
Pages : 329 pages

Rotorcraft System Identification
Author : N.A
Publisher : N.A
Release Date : 1991
ISBN 10 :
Pages : 273 pages

Rotorcraft Aeromechanics
Author : Wayne Johnson
Publisher : Cambridge University Press
Release Date : 2013-04-29
ISBN 10 : 1107355281
Pages : 329 pages

A rotorcraft is a class of aircraft that uses large-diameter rotating wings to accomplish efficient vertical take-off and landing. The class encompasses helicopters of numerous configurations (single main rotor and tail rotor, tandem rotors, coaxial rotors), tilting proprotor aircraft, compound helicopters, and many other innovative configuration concepts. Aeromechanics covers much of what the rotorcraft engineer needs: performance, loads, vibration, stability, flight dynamics, and noise. These topics include many of the key performance attributes and the often-encountered problems in rotorcraft designs. This comprehensive book presents, in depth, what engineers need to know about modelling rotorcraft aeromechanics. The focus is on analysis, and calculated results are presented to illustrate analysis characteristics and rotor behaviour. The first third of the book is an introduction to rotorcraft aerodynamics, blade motion, and performance. The remainder of the book covers advanced topics in rotary wing aerodynamics and dynamics.

Unmanned Rotorcraft Systems
Author : Guowei Cai,Ben M. Chen,Tong Heng Lee
Publisher : Springer Science & Business Media
Release Date : 2011-06-01
ISBN 10 : 9780857296351
Pages : 270 pages

Unmanned Rotorcraft Systems explores the research and development of fully-functional miniature UAV (unmanned aerial vehicle) rotorcraft, and provides a complete treatment of the design of autonomous miniature rotorcraft UAVs. The unmanned system is an integration of advanced technologies developed in communications, computing, and control areas, and is an excellent testing ground for trialing and implementing modern control techniques. Included are detailed expositions of systematic hardware construction, software systems integration, aerodynamic modeling; and automatic flight control system design. Emphasis is placed on the cooperative control and flight formation of multiple UAVs, vision-based ground target tracking, and landing on moving platforms. Other issues such as the development of GPS-less indoor micro aerial vehicles and vision-based navigation are also discussed in depth: utilizing the vision-based system for accomplishing ground target tracking, attacking and landing, cooperative control and flight formation of multiple unmanned rotorcraft; and future research directions on the related areas.

Advanced Aircraft Flight Performance
Author : Antonio Filippone
Publisher : Cambridge University Press
Release Date : 2012-12-17
ISBN 10 : 113978966X
Pages : 329 pages

This book discusses aircraft flight performance, focusing on commercial aircraft but also considering examples of high-performance military aircraft. The framework is a multidisciplinary engineering analysis, fully supported by flight simulation, with software validation at several levels. The book covers topics such as geometrical configurations, configuration aerodynamics and determination of aerodynamic derivatives, weight engineering, propulsion systems (gas turbine engines and propellers), aircraft trim, flight envelopes, mission analysis, trajectory optimisation, aircraft noise, noise trajectories and analysis of environmental performance. A unique feature of this book is the discussion and analysis of the environmental performance of the aircraft, focusing on topics such as aircraft noise and carbon dioxide emissions.

Japanese Technical Periodical Index
Author : N.A
Publisher : N.A
Release Date : 1987
ISBN 10 :
Pages : 329 pages

Government Reports Index
Author : N.A
Publisher : N.A
Release Date : 1972
ISBN 10 :
Pages : 329 pages

Author : Xiaosu Yi,Konstantinos Tserpes
Publisher : MDPI
Release Date : 2019-04-25
ISBN 10 : 3038976903
Pages : 154 pages

Today, mainly man-made materials, such as carbon and glass fibers, are used to produce composite parts in aviation. Renewable materials, such as natural fibers or bio-sourced resin systems, have not yet found their way into aviation. The project ECO-COMPASS aims to evaluate the potential applications of ecologically improved composite materials in the aviation sector in an international collaboration of Chinese and European partners. Natural fibers such as flax and ramie will be used for different types of reinforcements and sandwich cores. Furthermore, bio-based epoxy resins to substitute bisphenol-A based epoxy resins in secondary structures are under investigation. Adapted material protection technologies to reduce environmental influence and to improve fire resistance are needed to fulfil the demanding safety requirements in aviation. Modelling and simulation of chosen eco-composites aims for an optimized use of materials while a Life Cycle Assessment aims to prove the ecological advantages compared to synthetic state-of-the-art materials. This Special Issue provides selected papers from the project consortium partners.

Air Transport System
Author : Dieter Schmitt,Volker Gollnick
Publisher : Springer
Release Date : 2015-10-06
ISBN 10 : 3709118808
Pages : 377 pages

The book addresses all major aspects to be considered for the design and operation of aircrafts within the entire transportation chain. It provides the basic information about the legal environment, which defines the basic requirements for aircraft design and aircraft operation. The interactions between airport, air traffic management and the airlines are described. The market forecast methods and the aircraft development process are explained to understand the very complex and risky business of an aircraft manufacturer. The principles of flight physics as basis for aircraft design are presented and linked to the operational and legal aspects of air transport including all environmental impacts. The book is written for graduate students as well as for engineers and experts, who are working in aerospace industry, at airports or in the domain of transport and logistics.

Rotary-Wing Aerodynamics
Author : W. Z. Stepniewski
Publisher : Courier Corporation
Release Date : 2013-04-22
ISBN 10 : 0486318516
Pages : 640 pages

DIVClear, concise text covers aerodynamic phenomena of the rotor and offers guidelines for helicopter performance evaluation. Originally prepared for NASA. Prefaces. New Indexes. 10 black-and-white photos. 537 figures. /div

Low-Speed Aerodynamics
Author : Joseph Katz,Allen Plotkin
Publisher : Cambridge University Press
Release Date : 2001-02-05
ISBN 10 : 9780521665520
Pages : 613 pages

A treatment of low-speed aerodynamics, covering both theory and computational techniques, first published in 2001.

High Angle of Attack Aerodynamics
Author : Josef Rom
Publisher : Springer Science & Business Media
Release Date : 2012-12-06
ISBN 10 : 1461228247
Pages : 399 pages

The aerodynamics of aircraft at high angles of attack is a subject which is being pursued diligently, because the modern agile fighter aircraft and many of the current generation of missiles must perform well at very high incidence, near and beyond stall. However, a comprehensive presentation of the methods and results applicable to the studies of the complex aerodynamics at high angle of attack has not been covered in monographs or textbooks. This book is not the usual textbook in that it goes beyond just presenting the basic theoretical and experimental know-how, since it contains reference material to practical calculation methods and technical and experimental results which can be useful to the practicing aerospace engineers and scientists. It can certainly be used as a text and reference book for graduate courses on subjects related to high angles of attack aerodynamics and for topics related to three-dimensional separation in viscous flow courses. In addition, the book is addressed to the aerodynamicist interested in a comprehensive reference to methods of analysis and computations of high angle of attack flow phenomena and is written for the aerospace scientist and engineer who is familiar with the basic concepts of viscous and inviscid flows and with computational methods used in fluid dynamics.

The Power for Flight
Author : Jeremy R. Kinney
Publisher : Government Printing Office
Release Date : 2018-02-15
ISBN 10 : 9781626830370
Pages : 324 pages

The NACA and aircraft propulsion, 1915-1958 -- NASA gets to work, 1958-1975 -- The shift toward commercial aviation, 1966-1975 -- The quest for propulsive efficiency, 1976-1989 -- Propulsion control enters the computer era, 1976-1998 -- Transiting to a new century, 1990-2008 -- Toward the future

Vortex Methods
Author : Georges-Henri Cottet,G.-H. (Georges-Henri) Cottet,Petros D. Koumoutsakos,Professor Petros D Koumoutsakos
Publisher : Cambridge University Press
Release Date : 2000-03-13
ISBN 10 : 0521621860
Pages : 313 pages

The authors consider vortex methods as a method for the direct numerical simulation of incompressible viscous flows. Vortex methods offer an alternative to finite difference and spectral methods for high resolution numerical solutions.

High Performance Computing in Science and Engineering ' 18
Author : Wolfgang E. Nagel,Dietmar H. Kröner,Michael M. Resch
Publisher : Springer
Release Date : 2019-06-07
ISBN 10 : 3030133257
Pages : 514 pages

This book presents the state-of-the-art in supercomputer simulation. It includes the latest findings from leading researchers using systems from the High Performance Computing Center Stuttgart (HLRS) in 2018. The reports cover all fields of computational science and engineering ranging from CFD to computational physics and from chemistry to computer science with a special emphasis on industrially relevant applications. Presenting findings of one of Europe’s leading systems, this volume covers a wide variety of applications that deliver a high level of sustained performance. The book covers the main methods in high-performance computing. Its outstanding results in achieving the best performance for production codes are of particular interest for both scientists and engineers. The book comes with a wealth of color illustrations and tables of results.

B-47 Stratojet
Author : Jan Tegler
Publisher : McGraw Hill Professional
Release Date : 2000
ISBN 10 : 9780071355674
Pages : 168 pages

A rare close-up of the B-47 highlighting its precedent-setting technology, performance, and missions, as captured in interviews with designers and pilots, and exvlusive photos. Traces the B-47's importance as the Air Force's key deterrent in core missions and special operations throughout the '60s Cold War era. Reviews the groundbreaking technological innovations later standardized on military and commercial aircraft; records set by the aircraft; full performance and spec data; and more.

The Rapid Evaluation of Potential Fields in Particle Systems
Author : Leslie Greengard
Publisher : MIT Press
Release Date : 1988
ISBN 10 : 9780262071109
Pages : 90 pages

The evaluation of Coulombic or gravitational interactions in large ensembles of particles is an integral part of the numerical simulation of a large number of physical processes. Examples include celestial mechanics, plasma physics, the vortex method in fluid dynamics, molecular dynamics, molecular dynamics, and the solution of the Laplace equation via potential theory. A numerical model follows the trajectories of a number of particles moving in accordance with Newton's second law of motion in a field generated by the whole ensemble. In many situations, in order to be of physical interest, the simulation has to involve thousands of particles (or more), and the fields have to be evaluated for a large number of configurations. Unfortunately, an amount of work of the order O N-sg has traditionally been required to evaluate all pairwise interactions in a system of N particles, unless some approximation or truncation method is used. Large scale simulations have been extremely expensive in some cases, and prohibitive in others. An algorithm is presented for the rapid evaluation of the potential and force fields in large scale systems of particles. To evaluate all pairwise Coulombic interactions of N particles to within round off error, the algorithm requires an amount of work proportional to N, and this estimate does not depend on the statistics of the distribution. Both two and three dimensional versions of the algorithm have been constructed. Applications to several problems in physics, chemistry, biology, and numerical complex analysis are discussed.

Green Aviation
Author : Emily S. Nelson,D.R. Reddy
Publisher : CRC Press
Release Date : 2018-06-12
ISBN 10 : 1136318194
Pages : 358 pages

Aircraft emissions currently account for ~3.5% of all greenhouse gas emissions. The number of passenger miles has increased by 5% annually despite 9/11, two wars and gloomy economic conditions. Since aircraft have no viable alternative to the internal combustion engine, improvements in aircraft efficiency and alternative fuel development become essential. This book comprehensively covers the relevant issues in green aviation. Environmental impacts, technology advances, public policy and economics are intricately linked to the pace of development that will be realized in the coming decades. Experts from NASA, industry and academia review current technology development in green aviation that will carry the industry through 2025 and beyond. This includes increased efficiency through better propulsion systems, reduced drag airframes, advanced materials and operational changes. Clean combustion and emission control of noise, exhaust gases and particulates are also addressed through combustor design and the use of alternative fuels. Economic imperatives from aircraft lifetime and maintenance logistics dictate the drive for "drop-in" fuels, blending jet-grade and biofuel. New certification standards for alternative fuels are outlined. Life Cycle Assessments are used to evaluate worldwide biofuel approaches, highlighting that there is no single rational approach for sustainable buildup. In fact, unless local conditions are considered, the use of biofuels can create a net increase in environmental impact as a result of biofuel manufacturing processes. Governmental experts evaluate current and future regulations and their impact on green aviation. Sustainable approaches to biofuel development are discussed for locations around the globe, including the US, EU, Brazil, China and India.

Aircraft Performance & Design
Author : John David Anderson
Publisher : McGraw-Hill Science Engineering
Release Date : 1999
ISBN 10 :
Pages : 580 pages

Written by one of the most succesful aerospace authors, this new book develops aircraft performance techniques from first principles and applies then to real airplanes. It also address a philosophy of, and techniques for aircraft design. By developing and discussing these two subjects in a single text, the author captures a degree of synergism not found in other texts. The book is written in a conversational style, a trademark of all of John Anderson's texts, to enhance the readers' understanding.

Commercial Aircraft Propulsion and Energy Systems Research
Author : National Academies of Sciences, Engineering, and Medicine,Division on Engineering and Physical Sciences,Aeronautics and Space Engineering Board,Committee on Propulsion and Energy Systems to Reduce Commercial Aviation Carbon Emissions
Publisher : National Academies Press
Release Date : 2016-08-09
ISBN 10 : 0309440998
Pages : 122 pages

The primary human activities that release carbon dioxide (CO2) into the atmosphere are the combustion of fossil fuels (coal, natural gas, and oil) to generate electricity, the provision of energy for transportation, and as a consequence of some industrial processes. Although aviation CO2 emissions only make up approximately 2.0 to 2.5 percent of total global annual CO2 emissions, research to reduce CO2 emissions is urgent because (1) such reductions may be legislated even as commercial air travel grows, (2) because it takes new technology a long time to propagate into and through the aviation fleet, and (3) because of the ongoing impact of global CO2 emissions. Commercial Aircraft Propulsion and Energy Systems Research develops a national research agenda for reducing CO2 emissions from commercial aviation. This report focuses on propulsion and energy technologies for reducing carbon emissions from large, commercial aircraftâ€" single-aisle and twin-aisle aircraft that carry 100 or more passengersâ€"because such aircraft account for more than 90 percent of global emissions from commercial aircraft. Moreover, while smaller aircraft also emit CO2, they make only a minor contribution to global emissions, and many technologies that reduce CO2 emissions for large aircraft also apply to smaller aircraft. As commercial aviation continues to grow in terms of revenue-passenger miles and cargo ton miles, CO2 emissions are expected to increase. To reduce the contribution of aviation to climate change, it is essential to improve the effectiveness of ongoing efforts to reduce emissions and initiate research into new approaches.