Download or read book Subsonic Unsteady Aerodynamics for General Configurations Part I Volume I Direct Application of the Nonplanar Doublet Lattice Method written by Joseph P. Giesing and published by . This book was released on 1971 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two methods of accounting for body-lifting surface interference in unsteady flow are considered. The first method is a direct application of nonplanar lifting surface elements to both the lifting surfaces and the body surfaces. This type of idealization must be used with an axial doublet introduced to account for body incidence effects. The undesirable effects of the annular wing representation are then reduced. The second approach uses an image system and an axial singularity system to account for the effects of the bodies. The methods described are intended to be used by airplane designers to calculate with improved accuracy, the unsteady aerodynamic pressures that act on a lifting surface being propelled at subsonic speeds. The new feature of these calculations is that the effects on the pressure field induced by interference between the fuselage, for example, and the wing or the wing, pyon and nacelle, are taken into account. These calculations are an essential ingredient of flutter analyses and will improve the confidence level of such calculations in preventing wing-store flutter and flutter of advanced vehicles where fuselages are relatively large, provide some lifting capability and cause noticeable interference effects. (Author).
Download or read book The NASTRAN Theoretical Manual written by and published by . This book was released on 1981 with total page 946 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Subsonic Unsteady Aerodynamics for General Configurations Part 2 Volume 1 Application of the Doublet Lattice Method and the Method of Images to Lifting Surface Body Interference written by and published by . This book was released on 1972 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt: A technique for predicting steady and oscillatory aerodynamic loads on general configurations has been developed which is based on the Doublet- Lattice Method and the method of images. Chord- and spanwise loading on lifting surfaces and longitudinal body load distributions are determined. Configurations may be composed of an assemblage of bodies (elliptic cross sections and a distribution of width or radius) and lifting surfaces (arbitrary planform and dihedral, with or without control surfaces). Loadings predicted by this method are required for flutter, gust, frequency response and static aeroelastic analyses and may be used to determine static and dynamic stability derivatives. The methods described in this report are intended to be used by airplane designers to calculate with improved accuracy, the unsteady aerodynamic pressures that act on a lifting surface being propelled at subsonic speeds. The new feature of these calculations is that the effects on the pressure field induced by interference between the fuselage, for example, and the wing or the wing, pylon and nacelle, are taken into account. These calculations are an essential ingredient of flutter analyses and will improve the confidence level of such calculations in preventing wing-store flutter and flutter of advanced vehicles where fuselages are relatively large, provide some lifting capability and cause noticeable interference effects.
Download or read book Subsonic Unsteady Aerodynamics for General Configurations Part 1 Volume 2 Computer Program H7WC written by and published by . This book was released on 1971 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two methods of accounting for body-lifting surface interference in unsteady flow are considered. The first method is described in Part 1 of the report, while the second will be described in another paper. The first method is a direct application of nonplanar lifting surface elements to both the lifting surfaces and the body surfaces. The body is treated as an annular wing. This type of idealization must be used with an axial doublet introduced to account for body incidence effects. The undesirable effects of the annular wing representation are then reduced. The report also describes an improvement of the Doublet-Lattice Method of Albano and Rodden. The improvement pertains to wing- tail problems where there exists a small vertical (non-zero) separation between the wing and tail planes.
Download or read book A Compilation of the Mathematics Leading to the Doublet lattice Method written by Max Blair and published by . This book was released on 1992 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report provides a theoretical development of the doublet lattice method, the method of choice for most subsonic unsteady aerodynamic modelling for over twenty years. This is a tutorial based on many-key mathematical developments provided in the References section. An example source code is provided in the Appendix.
Download or read book NASA Technical Paper written by and published by . This book was released on 1988 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Note written by and published by . This book was released on 1974 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Collection of Technical Papers on Structures and Materials written by and published by . This book was released on 1975 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Abstract Bulletin written by and published by . This book was released on 1981 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fourth NASA Workshop on Computational Control of Flexible Aerospace Systems Part 2 written by and published by . This book was released on 1991 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Flutter Substantiation of Transport Category Airplanes written by United States. Federal Aviation Administration and published by . This book was released on 1985 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aerodynamics written by Mofid Gorji-Bandpy and published by BoD – Books on Demand. This book was released on 2021-02-10 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aerodynamics, the study of air motion around solid objects, allows us to understand and measure the dominating forces acting on aircrafts, buildings, bridges, automobiles, and other structures. The forces that result in an aircraft overcoming gravity and drag are called thrust and lift. Various parameters such as geometrical configurations of objects, as well as physical properties of air, which may be functions of position and time, affect those forces. This book covers some of the latest studies regarding the application of the principles of aerodynamics to the design of many different engineered objects. This book will be of interest to mechanical and aerospace engineering students, academics, and researchers who are looking for new insights into this fascinating branch of fluid mechanics.
Download or read book Aeroservoelasticity written by Ashish Tewari and published by Springer. This book was released on 2015-03-24 with total page 323 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph presents the state of the art in aeroservoelastic (ASE) modeling and analysis and develops a systematic theoretical and computational framework for use by researchers and practicing engineers. It is the first book to focus on the mathematical modeling of structural dynamics, unsteady aerodynamics, and control systems to evolve a generic procedure to be applied for ASE synthesis. Existing robust, nonlinear, and adaptive control methodology is applied and extended to some interesting ASE problems, such as transonic flutter and buffet, post-stall buffet and maneuvers, and flapping flexible wing. The author derives a general aeroservoelastic plant via the finite-element structural dynamic model, unsteady aerodynamic models for various regimes in the frequency domain, and the associated state-space model by rational function approximations. For more advanced models, the full-potential, Euler, and Navier-Stokes methods for treating transonic and separated flows are also briefly addressed. Essential ASE controller design and analysis techniques are introduced to the reader, and an introduction to robust control-law design methods of LQG/LTR and H2/H∞ synthesis is followed by a brief coverage of nonlinear control techniques of describing functions and Lyapunov functions. Practical and realistic aeroservoelastic application examples derived from actual experiments are included throughout. Aeroservoelasiticity fills an important gap in the aerospace engineering literature and will be a valuable guide for graduate students and advanced researchers in aerospace engineering, as well as professional engineers, technicians, and test pilots in the aircraft industry and laboratories.
Download or read book The NASTRAN Theoretical Manual written by and published by . This book was released on 1970 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Memorandum written by and published by . This book was released on 1988 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 24th Aerospace Mechanisms Symposium written by and published by . This book was released on 1990 with total page 910 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advisory Circular written by United States. Federal Aviation Administration and published by . This book was released on 19?? with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
