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A Three Dimensional Unsteady Aerodynamic Model With Applications To Flapping Wing Propulsion
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Book Synopsis A Three-dimensional Unsteady Aerodynamic Model with Applications to Flapping-wing Propulsion by : James Frederick Winfield
Download or read book A Three-dimensional Unsteady Aerodynamic Model with Applications to Flapping-wing Propulsion written by James Frederick Winfield and published by . This book was released on 1990 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fixed and Flapping Wing Aerodynamics for Micro Air Vehicle Applications by : Thomas J. Mueller
Download or read book Fixed and Flapping Wing Aerodynamics for Micro Air Vehicle Applications written by Thomas J. Mueller and published by AIAA. This book was released on 2001 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt: This title reports on the latest research in the area of aerodynamic efficency of various fixed-wing, flapping wing, and rotary wing concepts. It presents the progress made by over fifty active researchers in the field.
Book Synopsis Three-Dimensional Unsteady Lift Problems in High-Speed Flight-The Triangular Wing by :
Download or read book Three-Dimensional Unsteady Lift Problems in High-Speed Flight-The Triangular Wing written by and published by . This book was released on 1950 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: The problem of the build-up of lift on two- and three-dimensional wings flying at high speeds is discussed as a boundary-value problem for the classical wave equation. Kirchhoff's formula is applied so that the analysis is reduced, Just as in the steady state, to an investigation of sources' and doublets. Some simple applications of this method are considered, including the determination of the starting lift of a three- dimensional wing and the potential functions for some types of unsteady vortex motion.
Book Synopsis Fundamentals of Modern Unsteady Aerodynamics by : Ülgen Gülçat
Download or read book Fundamentals of Modern Unsteady Aerodynamics written by Ülgen Gülçat and published by Springer. This book was released on 2015-10-31 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, the author introduces the concept of unsteady aerodynamics and its underlying principles. He provides the readers with a comprehensive review of the fundamental physics of free and forced unsteadiness, the terminology and basic equations of aerodynamics ranging from incompressible flow to hypersonics. The book also covers modern topics related to the developments made in recent years, especially in relation to wing flapping for propulsion. The book is written for graduate and senior year undergraduate students in aerodynamics and also serves as a reference for experienced researchers. Each chapter includes ample examples, questions, problems and relevant references. The treatment of these modern topics has been completely revised end expanded for the new edition. It now includes new numerical examples, a section on the ground effect, and state-space representation.
Book Synopsis Unsteady Three-Dimensional Aerodynamic Flow by :
Download or read book Unsteady Three-Dimensional Aerodynamic Flow written by and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The overall objective of this program is to determine the instantaneous flow structure on delta wings at high angle of attack as well as from cylindrical bodies, which are subjected to basic classes of motion. New techniques of high image density particle image velocimetry provide the instantaneous vorticity fields and streamline patterns, thereby allowing interpretation of the underlying physics using critical point theory. This type of quantitative interpretation of the flow structure is crucial for performing vorticity balances on wings and bodies and thereby optimization of overall performance characteristics. Furthermore, for the case of the delta wing at high angle of attack, local control techniques are applied simultaneously at leading and trailing edges of the wing, in order to alter the crucial features of vortex breakdown and subsequent large scale stall. Such control techniques have application to a wide variety of separated flows from wings and cylindrical bodies.
Book Synopsis Unsteady Aerodynamics and Propulsive Characteristics of Flapping Wings with Applications to Avian Fight [sic] by : Michael Shawn Vest
Download or read book Unsteady Aerodynamics and Propulsive Characteristics of Flapping Wings with Applications to Avian Fight [sic] written by Michael Shawn Vest and published by . This book was released on 1996 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: Propulsive forces can be generated with flapping or heaving wings traveling through a fluid, as demonstrated in animal flight. The flow field of a bird in flight is one of the most complex aerodynamic problems that can be examined. Many other bird flight theories are based on quasi-steady fluid dynamic assumptions even though the flow field is inherently unsteady. To help examine the time dependency of bird flight, an unsteady three dimensional potential flow panel code was developed. Another problem in studying the aerodynamics of avian flight is the limited amount of quantitative experimental data on flapping wings. To gain further understanding of avian flight and to develop an experimental database for comparison of the fluid dynamic model, a mechanical bird was constructed and placed in a wind tunnel. The mechanical bird, modeled after a pigeon, is capable of flapping at various angles to the freestream flow. For the current study, however, the flapping motion was limited to a plane normal to the oncoming flow. Results of the numerical model were compared to the measured forces on the mechanical bird as well as to the limited data available on real birds. In one case, the model was applied to a flapping wing in a wind tunnel at high advance ratios $(J=4.31)$ where the computed average lift and thrust were within the error bounds of the experimental data. The model was also applied to high frequency flapping flight $(J=0.76)$ of a pigeon flying in a wind tunnel, where the predicted lift matched the weight of the bird. Time histories of the mechanical pigeon agreed well with the numerical predictions for high $(J=5.38)$ and low $(J=0.84)$ advance ratios. The model was also extended to examine the effect of wing twist on flight efficiencies. Flight characteristics of the mechanical bird and a real pigeon were also compared.
Book Synopsis Three-dimensional Unsteady Lift Problems in High-speed Flight by : Harvard Lomax
Download or read book Three-dimensional Unsteady Lift Problems in High-speed Flight written by Harvard Lomax and published by . This book was released on 1951 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: The indicial lift and pitching-moment coefficients are derived for flat-plate triangular wings at supersonic speeds. Coefficients are determined for angle-of-attack distributions corresponding to sinking and pitching wings. The wing with supersonic edges is completely analyzed, the wing with subsonic edges is partially analyzed; the solution in this case being completed for very narrow wings by an application of slender wing theory. In case of the supersonic edges, a comparison is made with known two-dimensional results and also with results for the same triangular wing in reversed flow.
Book Synopsis Unsteady Aerodynamic Model of Flapping Wings by : Michael S. Vest
Download or read book Unsteady Aerodynamic Model of Flapping Wings written by Michael S. Vest and published by . This book was released on 1995 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flight Physics by : Konstantin Volkov
Download or read book Flight Physics written by Konstantin Volkov and published by BoD – Books on Demand. This book was released on 2018-02-14 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book focuses on the synthesis of the fundamental disciplines and practical applications involved in the investigation, description, and analysis of aircraft flight including applied aerodynamics, aircraft propulsion, flight performance, stability, and control. The book covers the aerodynamic models that describe the forces and moments on maneuvering aircraft and provides an overview of the concepts and methods used in flight dynamics. Computational methods are widely used by the practicing aerodynamicist, and the book covers computational fluid dynamics techniques used to improve understanding of the physical models that underlie computational methods.
Book Synopsis An Efficient Method for Computations of Three-Dimensional Unsteady Transonic Aerodynamics by : K. Y. Fung
Download or read book An Efficient Method for Computations of Three-Dimensional Unsteady Transonic Aerodynamics written by K. Y. Fung and published by . This book was released on 1985 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: For aeroelastic application, the present Transonic Equipment Strip (TES) method has established an efficient and cost effective procedure for unsteady flow computations of arbitrary wing planforms including control surface. According to the nature of three dimensional unsteady transonic flow, a method based on the TES model is developed which consists of two consecutive correction steps to a given unsteady two-dimensional code. The latter could be a time-linearized transonic code or a nonlinear one such as the LTRAN2 code. The correction steps are: first, the mean-flow correction step which involves an equivalent airfoil design procedure; and second, the spanwise phase correction step which accounts for the effects of acoustic wave propagation in three dimensions. Computed results using the TES method are compared with those obtained by current methods such as results using the TES method are compared with those obtained by current methods such as various versions of the XTRAN3S code, Isogai's full potential code, and measured data provided by the National Aerospace Laboratory and the Royal Aeronautical Establishment. Computed cases included rectangular wings in pitching and bending oscillations, the Northrop F-5 wing in pitching oscillation, the AGARD standard RAE wing with an oscillating flap, and the LANN wing in pitching oscillation. Assessments of the present approach and other existing methods are given. (KR).
Download or read book The DelFly written by G.C.H.E. de Croon and published by Springer. This book was released on 2015-11-26 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the topics most relevant to autonomously flying flapping wing robots: flapping-wing design, aerodynamics, and artificial intelligence. Readers can explore these topics in the context of the "Delfly", a flapping wing robot designed at Delft University in The Netherlands. How are tiny fruit flies able to lift their weight, avoid obstacles and predators, and find food or shelter? The first step in emulating this is the creation of a micro flapping wing robot that flies by itself. The challenges are considerable: the design and aerodynamics of flapping wings are still active areas of scientific research, whilst artificial intelligence is subject to extreme limitations deriving from the few sensors and minimal processing onboard. This book conveys the essential insights that lie behind success such as the DelFly Micro and the DelFly Explorer. The DelFly Micro, with its 3.07 grams and 10 cm wing span, is still the smallest flapping wing MAV in the world carrying a camera, whilst the DelFly Explorer is the world's first flapping wing MAV that is able to fly completely autonomously in unknown environments. The DelFly project started in 2005 and ever since has served as inspiration, not only to many scientific flapping wing studies, but also the design of flapping wing toys. The combination of introductions to relevant fields, practical insights and scientific experiments from the DelFly project make this book a must-read for all flapping wing enthusiasts, be they students, researchers, or engineers.
Book Synopsis An Introduction to Flapping Wing Aerodynamics by : Wei Shyy
Download or read book An Introduction to Flapping Wing Aerodynamics written by Wei Shyy and published by Cambridge University Press. This book was released on 2013-08-19 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an ideal book for graduate students and researchers interested in the aerodynamics, structural dynamics and flight dynamics of small birds, bats and insects, as well as of micro air vehicles (MAVs), which present some of the richest problems intersecting science and engineering. The agility and spectacular flight performance of natural flyers, thanks to their flexible, deformable wing structures, as well as to outstanding wing, tail and body coordination, is particularly significant. To design and build MAVs with performance comparable to natural flyers, it is essential that natural flyers' combined flexible structural dynamics and aerodynamics are adequately understood. The primary focus of this book is to address the recent developments in flapping wing aerodynamics. This book extends the work presented in Aerodynamics of Low Reynolds Number Flyers (Shyy et al. 2008).
Download or read book Applied mechanics reviews written by and published by . This book was released on 1948 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Computational and Experimental Investigation of Flapping-Wing Propulsion by : Timothy Craig Lund
Download or read book A Computational and Experimental Investigation of Flapping-Wing Propulsion written by Timothy Craig Lund and published by . This book was released on 2000-03-01 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flapping-wing propulsion is studied experimentally and numerically. The objective of the research is to provide further insight into the aerodynamics of flapping-wing air vehicles. Experimental work is conducted in the NPS 1.5 m x 1.5 m (5 ft x 5 ft) in-draft wind tunnel. A previously constructed long-span flapping-wing model suspended by cables is used to approximate the two-dimensional nature of the numerical simulation. For this experiment, the model is configured with two wings executing plunge-only motion. Thrust is indirectly determined by using a laser rangefinder to measure streamwise displacement of the model. Results are compared with previous experimental tests. A numerical analysis is conducted using USPOT, a locally developed unsteady panel code that models two independently moving airfoils with three degrees of freedom and non-linear deforming wakes. Thrust and efficiencies are computed for harmonically oscillating airfoils. Direct comparison is made between experimental and numerical thrust measurements.
Book Synopsis Formulation of the Three Dimensional Transonic Unsteady Aerodynamic Problem by : H. Yoshihara
Download or read book Formulation of the Three Dimensional Transonic Unsteady Aerodynamic Problem written by H. Yoshihara and published by . This book was released on 1979 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unsteady transonic flow for a swept wing of moderate sweep is formulated in the small disturbance limit. Boundary conditions at the wing, the trailing vortex sheet, and the outer computatinal boundaries are given including the ventilated wall conditions. Shortcomings of the small disturbance hypothesis is reviewed, suggesting means to compensate for them. Viscous interactions are described together with procedures to incorporate their effects. (Author).
Book Synopsis Modern Flexible Multi-Body Dynamics Modeling Methodology for Flapping Wing Vehicles by : Cornelia Altenbuchner
Download or read book Modern Flexible Multi-Body Dynamics Modeling Methodology for Flapping Wing Vehicles written by Cornelia Altenbuchner and published by Academic Press. This book was released on 2017-09-15 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern Flexible Multi-Body Dynamics Modeling Methodology for Flapping Wing Vehicles presents research on the implementation of a flexible multi-body dynamic representation of a flapping wing ornithopter that considers aero-elasticity. This effort brings advances in the understanding of flapping wing flight physics and dynamics that ultimately leads to an improvement in the performance of such flight vehicles, thus reaching their high performance potential. In using this model, it is necessary to reduce body accelerations and forces of an ornithopter vehicle, as well as to improve the aerodynamic performance and enhance flight kinematics and forces which are the design optimization objectives. This book is a useful reference for postgraduates in mechanical engineering and related areas, as well as researchers in the field of multibody dynamics. Uses Lagrange equations of motion in terms of a generalized coordinate vector of the rigid and flexible bodies in order to model the flexible multi-body system Provides flight verification data and flight physics of highly flexible ornithoptic vehicles Includes an online companion site with files/codes used in application examples
Book Synopsis Three-dimensional Unsteady Flow Elicited by Finite Wings and Complex Configurations by : Jeffrey Clayton Ashworth
Download or read book Three-dimensional Unsteady Flow Elicited by Finite Wings and Complex Configurations written by Jeffrey Clayton Ashworth and published by . This book was released on 1987 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies of 2-dimensional unsteady separated flows have demonstrated possible aerodynamic benefits of controlled unsteady flows about airfoil surfaces. However, since all applicable wings are necessarily finite, a thorough understanding of 3-dimensional unsteady flows is essential. Any direct application or modelling of this complex 3-dimensional phenomenon may be somewhat premature until a characteristic data base is established. The spatial and temporal transport, accumulation and dissipation of vorticity on the surface of three wings varying only in sweep angles (forward, straight and aft) were examined using flow visualization and hot wire anemometry. Identical geometric positions were tested on each wing for a variety of dynamic parameters. Each sweep geometry produced distinct, time-dependent, spanwise and chordwise sites for vorticity accumulation into large scale leading edge and wingtip vortices. The wingtip and leading edge vortex interactions produced spanwise flow patterns uncharacteristic of 2-dimensional flows. Wing sweep is a dominant geometric parameter in analyzing the effects of unsteady wingtip flow. An initial investigation into the feasibility of unsteady flow application was performed on a model of the X-29 Forward Swept Wing Technology Demonstrator. This model geometry produces complex flow patterns but may be ideally suited for application of unsteady flow technology. Unsteady flow structures were observed which may ultimately generate beneficial, slow speed flight characteristics of advanced aircraft. These investigations provide initial insight into 3-dimensional flow behavior elicited by different sweep geometries and dynamic parameters. (Theses).
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