Download or read book Calculated Unsteady Aerodynamics of Wings written by James E. McCune and published by . This book was released on 1987 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: Substantial advances in the analysis of the large-amplitude unsteady aerodynamics of wings have been achieved. Special focus has been placed on developing techniques for describing the exact non-linear convection, deformation, and roll-up of the vorticity wakes above and behind active wing surfaces. Using a combination of analytic and computer-interactive methods, new insights and more exact aerodynamic performance results have been generated. The effects of dissipative internal 'cores' in the overall 3D wake structures above deltas have been analyzed in the slender wing limit. New paths for further computer-assisted advances, including improved understanding of wing-wake interaction in severe maneuver, vortex core formation and break-up, and aerodynamic history effects have been charted. Papers are included on the following topics: Nonlinear aerodynamics of two-dimensional airfoils in severe maneuver; Interactive aerodynamics of wings in severe maneuver; Slender wing theory including regions of embedded total pressure loss; Keywords: Unsteady wing theory; Wake evolution; Vortex core evolution; Flight maneuvers; Unsteady wing loads; Flight loads.
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.
Download or read book An Approximate Analysis of Wing Unsteady Aerodynamics written by William R. Wells and published by . This book was released on 1979 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: A brief review of the unsteady aerodynamics in lifting surface theory is reported. For utility in design application, simplified but accurate analytical expressions were developed for generalized unsteady aerodynamics of wings of finite aspect ratio and sweep. This includes a means of calculating the unsteady lift load on the wing and tail surface of arbitrary shape and angle of attack variation. In addition, a formulation to include the indicial aerodynamics in the longitudinal equations of motion of the aircraft was performed. Sample numerical solutions to the longitudinal equations for a step input in elevator deflection are presented for the Navion aircraft. From these calculations, a noted difference in angle of attack and pitch rate response can be seen for the cases of unsteady and quasi-steady aerodynamics. The apparent increase in damping effects in the aircraft response due to the unsteady aerodynamics indicate that various design constraints might be relaxed somewhat if the unsteady aerodynamics is modeled properly. (Author).
Download or read book Introduction to Unsteady Aerodynamics and Dynamic Aeroelasticity written by Luciano Demasi and published by Springer Nature. This book was released on with total page 804 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Steady and Unsteady Aerodynamics of Wings written by Kerim Can Bayar and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transonic Unsteady Aerodynamic and Aeroelastic Calculations about Airfoils and Wings written by and published by . This book was released on 1987 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Calculation of Unsteady Transonic Aerodynamics for Oscillating Wings with Thickness written by S. Y. Ruo and published by . This book was released on 1975 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: An analytical approach is presented to account for some of the nonlinear characteristics of the transonic flow equation for finite thickness wings undergoing harmonic oscillation at sonic flight speed in an inviscid, shock-free fluid. The thickness effect is accounted for in the analysis through use of the steady local Mach number distribution over the wing at its mean position by employing the local linearization concept and a coordinate transformation. Computed results are compared with that of the linearized theory and experiments. Based on the local linearization concept, an alternate formulation avoiding the limitations of the coordinate transformation method is presented.
Download or read book Modeling of longitudinal unsteady aerodynamics of a wingtail combination written by and published by DIANE Publishing. This book was released on with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aerodynamics of Wings and Bodies written by Holt Ashley and published by Courier Corporation. This book was released on 1965-01-01 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: This excellent, innovative reference offers a wealth of useful information and a solid background in the fundamentals of aerodynamics. Fluid mechanics, constant density inviscid flow, singular perturbation problems, viscosity, thin-wing and slender body theories, drag minimalization, and other essentials are addressed in a lively, literate manner and accompanied by diagrams.
Download or read book Calculation of High Angle of Attack Aerodynamics of Fighter Configurations written by Chuan-Tau Edward Lan and published by . This book was released on 1991 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: A computational method for unsteady aerodynamics of fighter configurations at high angles of attack is developed. The leading-edge vortices are represented by free vortex filaments which are adjusted iteratively to satisfy the force-free condition. The small-disturbance, unsteady potential equation is solved in the frequency domain for motions in pitching, plunging, flapping, side movement, rolling, and yawing oscillation in compressible flow. Computed results in rolling moment coefficients due to side acceleration are compared with data for 60-deg and 80-deg delta wings. Lateral-directional characteristics for an F-106b configuration are also compared with data obtained in forced oscillation tests. It is shown that reasonable results can be obtained by the present unsteady flow method, but not by steady flow theory. Calculation of dynamic stall effects on a rectangular wing of aspect ratio 4 is demonstrated by using experimental section data. Although no data for the wing are available, the results appear plausible. Industrial usage of this has produced mixed results. At this time, the use of these methods in a production manner is recommended.
Download or read book Demonstration of a Supersonic Box Method for Unsteady Aerodynamics of Nonplanar Wings written by James J. Olsen and published by . This book was released on 1969 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report presents and interprets the calculations of the unsteady aerodynamic prediction method known as the 'Nonplanar Mach Box' method. It contains examples of data input and output for the associated computer program and explains the program's interpretation of the user's modal data. Also included are summaries of convergence properties, comparison with exact linearized theory, and a brief outline of the calculations for the Advisory Group for Aeronautical Research and Development (AGARD) planforms. (Author).
Download or read book Unsteady Transonic Aerodynamic and Aeroelastic Calculations about Airfoils and Wings written by and published by . This book was released on 1984 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Subsonic Aerodynamic and Flutter Characteristics of Several Wings Calculated by the SOUSSA P1 1 Panel Method written by Edward Carson Yates and published by . This book was released on 1982 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Engineered Biomimicry written by Akhlesh Lakhtakia and published by Newnes. This book was released on 2013-05-24 with total page 493 pages. Available in PDF, EPUB and Kindle. Book excerpt: Engineered Biomimicry covers a broad range of research topics in the emerging discipline of biomimicry. Biologically inspired science and technology, using the principles of math and physics, has led to the development of products as ubiquitous as VelcroTM (modeled after the spiny hooks on plant seeds and fruits). Readers will learn to take ideas and concepts like this from nature, implement them in research, and understand and explain diverse phenomena and their related functions. From bioinspired computing and medical products to biomimetic applications like artificial muscles, MEMS, textiles and vision sensors, Engineered Biomimicry explores a wide range of technologies informed by living natural systems. Engineered Biomimicry helps physicists, engineers and material scientists seek solutions in nature to the most pressing technical problems of our times, while providing a solid understanding of the important role of biophysics. Some physical applications include adhesion superhydrophobicity and self-cleaning, structural coloration, photonic devices, biomaterials and composite materials, sensor systems, robotics and locomotion, and ultra-lightweight structures. - Explores biomimicry, a fast-growing, cross-disciplinary field in which researchers study biological activities in nature to make critical advancements in science and engineering - Introduces bioinspiration, biomimetics, and bioreplication, and provides biological background and practical applications for each - Cutting-edge topics include bio-inspired robotics, microflyers, surface modification and more
Download or read book Unsteady Aerodynamics written by Grigorios Dimitriadis and published by John Wiley & Sons. This book was released on 2024-03-11 with total page 581 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unsteady Aerodynamics A comprehensive overview of unsteady aerodynamics and its applications The study of unsteady aerodynamics goes back a century and has only become more significant as aircraft become increasingly sophisticated, fly faster, and their structures are lighter and more flexible. Progress in the understanding of flow physics, computing power and techniques, and modelling technologies has led to corresponding progress in unsteady aerodynamics, with a wide range of methods currently used to predict the performance of engineering structures under unsteady conditions. Unsteady Aerodynamics offers a comprehensive and systematic overview of the application of potential and vortex methods to the subject. Beginning with an introduction to the fundamentals of unsteady flow, it then discusses the modelling of attached and separated, incompressible and compressible flows around two-dimensional and three-dimensional bodies. The result is an essential resource for design and simulation in aerospace engineering. Unsteady Aerodynamics readers will also find: MATLAB examples and exercises throughout, with codes and solutions on an accompanying website Detailed discussion of most classes of unsteady phenomena, including flapping flight, transonic flow, dynamic stall, flow around bluff bodies and more Validation of theoretical and numerical predictions using comparisons to experimental data from the literature Unsteady Aerodynamics is ideal for researchers, engineers, and advanced students in aerospace engineering.
Download or read book Unsteady Aerodynamics for Advanced Configurations written by Lowell V. Andrew and published by . This book was released on 1968 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two methods were outlined in detail, and one of them was mechanized, for calculating acoustic ray paths emanating from any point in a non-uniform transonic flow field surrounding a wing. It gives the ray path, and the time, for the minimum time of travel from the acoustic source point to the field point. The resulting velocity potential is also computed. It was necessary to establish an accurate representation of the flow characteristics in the field surrounding the wing. Some ray lines travel over the planform and into the surrounding flow field. It was established that once off the planform they do not return. Available methods predict phase lags based on the assumption that acoustic rays travel in straight lines. The results of the study show this to be a very poor approximation at transonic speeds. Therefore, it is recommended that the method presented in the report be fully developed for the purpose of calculating generalized forces on wings in harmonic motion at transonic speeds. A computer program that would predict these phase lags with reasonable accuracy, and the corresponding flutter characteristics and unsteady aerodynamic loads on a wing responding to externally applied forces, such as gusts, would fill an important gap in the available technology. (Author).
Download or read book Unsteady Transonic Aerodynamic and Aeroelastic Calculations about Airfoils and Wings written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-16 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development and application of transonic small disturbance codes for computing two dimensional flows, using the code ATRAN2, and for computing three dimensional flows, using the code ATRAN3S, are described. Calculated and experimental results are compared for unsteady flows about airfoils and wings, including several of the cases from the AGARD Standard Aeroelastic Configurations. In two dimensions, the results include AGARD priority cases for the NACA 64A006, NACA 64A010, NACA 0012, and MBB-A3 airfoils. In three dimensions, the results include flows about the F-5 wing, a typical wing, and the AGARD rectangular wings. Viscous corrections are included in some calculations, including those for the AGARD rectangular wing. For several cases, the aerodynamic and aeroelastic calculations are compared with experimental results. Goorjian, P. M. and Guruswamy, G. P. Ames Research Center NASA-TM-85986, A-9822, NAS 1.15:85986 RTOP 505-31-01...
