Download or read book Aeroelastic Modeling and Flutter Control in Aircraft with Low Aspect Ratio Composite Wings written by Russell A. Morris and published by . This book was released on 1996 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Formulation of a Structural Model for Flutter Analysis of Low Aspect Ratio Composite Aircraft Wings written by Timothy J. Seitz and published by . This book was released on 1992 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Modern Course in Aeroelasticity written by E.H. Dowell and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aeroelasticity is the study of flexible structures situated in a flowing fluid. Its modern origins are in the field of aerospace engineering, but it has now expanded to include phenomena arising in other fields such as bioengineering, civil engineering, mechanical engineering and nuclear engineering. The present volume is a teaching text for a first, and possibly second, course in aeroelasticity. It will also be useful as a reference source on the fundamentals of the subject for practitioners. In this third edition, several chapters have been revised and three new chapters added. The latter include a brief introduction to `Experimental Aeroelasticity', an overview of a frontier of research `Nonlinear Aeroelasticity', and the first connected, authoritative account of `Aeroelastic Control' in book form. The authors are drawn from a range of fields including aerospace engineering, civil engineering, mechanical engineering, rotorcraft and turbomachinery. Each author is a leading expert in the subject of his chapter and has many years of experience in consulting, research and teaching.
Download or read book Active Aeroelastic Tailoring of High Aspect Ratio Composite Wings written by and published by . This book was released on 2005 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nonlinear aeroelastic modeling and the fundamental mechanisms of active aeroelastic tailoring of high-aspect-ratio composite wings for High-altitude Long-endurance (HALE) aircraft is presented. To investigate the effects of distributed anisotropic strain actuation and their synergism with the passive aeroelastic tailored composite structure, a new framework was developed for analysis and design of high aspect ratio active flexible wings. The formulation is capable of modeling the nonlinear large deflection behavior of slender wings and other structural members, deformation due to applied voltages on the active plies in the skin of the wing, and the unsteady subsonic aerodynamic forces acting on the wing. Because HALE wings are long and slender, they can be well modeled as beams undergoing three dimensional displacements and rotations. The cross sectional stiffness, inertia, and actuation properties of the wing are calculated along the span, and then a nonlinear beam model is constructed. A novel beam representation was developed and it was based entirely on the beam strains, resulting in a computationally efficient low-order model suitable for preliminary structural design and control synthesis. The formulation was then extended to analyze different beam configurations, particularly in the presence of joints and splits. With that, the entire vehicle can be modeled and non-conventional wing configurations such as the joined wing could be analyzed. Finally, different aircraft configurations such as the ones being considered for the new Air Force Sensor Craft vehicle were studied.
Download or read book Relationship Between Flutter Parameters and Generalized Aerodynamic Forces for Wings of Low Aspect Ratio written by Bernard Mazelsky and published by . This book was released on 1962 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: A set of closed-form approximations is derived which relates the flutter conditions of a wing to its generalized aerodynamic forces. A simplified two-mode analysis is used to obtain a firstorder approximation. More general analyses are performed by treating additional effects as perturbations. The derivations are applicable to a wide class of low-aspect-ratio wings and apply to subsonic, transonic, supersonic, and hypersonic flow.
Download or read book Introduction to Structural Dynamics and Aeroelasticity written by Dewey H. Hodges and published by Cambridge University Press. This book was released on 2014-01-02 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text provides an introduction to structural dynamics and aeroelasticity, with an emphasis on conventional aircraft. The primary areas considered are structural dynamics, static aeroelasticity, and dynamic aeroelasticity. The structural dynamics material emphasizes vibration, the modal representation, and dynamic response. Aeroelastic phenomena discussed include divergence, aileron reversal, airload redistribution, unsteady aerodynamics, flutter, and elastic tailoring. More than one hundred illustrations and tables help clarify the text, and more than fifty problems enhance student learning. This text meets the need for an up-to-date treatment of structural dynamics and aeroelasticity for advanced undergraduate or beginning graduate aerospace engineering students. Praise from the First Edition "Wonderfully written and full of vital information by two unequalled experts on the subject, this text meets the need for an up-to-date treatment of structural dynamics and aeroelasticity for advanced undergraduate or beginning graduate aerospace engineering students." - Current Engineering Practice "Hodges and Pierce have written this significant publication to fill an important gap in aeronautical engineering education. Highly recommended." - Choice ". . . a welcome addition to the textbooks available to those with interest in aeroelasticity. . . . As a textbook, it serves as an excellent resource for advanced undergraduate and entry-level graduate courses in aeroelasticity. . . . Furthermore, practicing engineers interested in a background in aeroelasticity will find the text to be a friendly primer." - AIAA Bulletin
Download or read book Active Aeroelastic Wing written by Fouad Sabry and published by One Billion Knowledgeable. This book was released on 2022-10-25 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: What Is Active Aeroelastic Wing The X-53 Active Aeroelastic Wing (AAW) development program is an American research project that has been completed. This project was carried out jointly by the Air Force Research Laboratory (AFRL), Boeing Phantom Works, and NASA's Dryden Flight Research Center. At NASA's Dryden Flight Research Center, the technology was flight tested on a modified McDonnell Douglas F/A-18 Hornet. Active Aeroelastic Wing Technology is a technology that blends the aerodynamics, controls, and structure of a wing in order to harness and regulate the aeroelastic twist that a wing experiences under dynamic stresses and high speeds. The use of multiple leading and trailing edge controls, such as "aerodynamic tabs," enables subtle amounts of aeroelastic twist to be controlled to provide large amounts of wing control power, while simultaneously minimizing maneuver air loads under high wing strain conditions or aerodynamic drag under low wing strain conditions. This is accomplished while maintaining a balance between the two extremes of wing strain conditions. This operation served as the very first demonstration of AAW technology on a large scale. How You Will Benefit (I) Insights, and validations about the following topics: Chapter 1: Active Aeroelastic Wing Chapter 2: Aileron Chapter 3: Aeroelasticity Chapter 4: Elevon Chapter 5: NASA X-43 Chapter 6: List of experimental aircraft Chapter 7: Boeing X-45 Chapter 8: Grumman X-29 Chapter 9: Air Force Research Laboratory Chapter 10: Boeing X-48 Chapter 11: Elevator (aeronautics) Chapter 12: Flap (aeronautics) Chapter 13: United States Air Force Stability and Control Digital DATCOM Chapter 14: Leading-edge cuff Chapter 15: Flaperon Chapter 16: Spoileron Chapter 17: McDonnell Douglas F-15 STOL/MTD Chapter 18: Boeing X-51 Waverider Chapter 19: Adaptive compliant wing Chapter 20: Leading-edge slat Chapter 21: General Dynamics-Boeing AFTI/F-111A Aardvark (II) Answering the public top questions about boeing x53 active aeroelastic wing. (III) Real world examples for the usage of boeing x53 active aeroelastic wing in many fields. (IV) 17 appendices to explain, briefly, 266 emerging technologies in each industry to have 360-degree full understanding of boeing x53 active aeroelastic wing' technologies. Who This Book Is For Professionals, undergraduate and graduate students, enthusiasts, hobbyists, and those who want to go beyond basic knowledge or information for any kind of boeing x53 active aeroelastic wing.
Download or read book Introduction to Nonlinear Aeroelasticity written by Grigorios Dimitriadis and published by John Wiley & Sons. This book was released on 2017-03-10 with total page 944 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction to Nonlinear Aeroelasticity Introduces the latest developments and technologies in the area of nonlinear aeroelasticity Nonlinear aeroelasticity has become an increasingly popular research area in recent years. There have been many driving forces behind this development, increasingly flexible structures, nonlinear control laws, materials with nonlinear characteristics and so on. Introduction to Nonlinear Aeroelasticity covers the theoretical basics in nonlinear aeroelasticity and applies the theory to practical problems. As nonlinear aeroelasticity is a combined topic, necessitating expertise from different areas, the book introduces methodologies from a variety of disciplines such as nonlinear dynamics, bifurcation analysis, unsteady aerodynamics, non-smooth systems and others. The emphasis throughout is on the practical application of the theories and methods, so as to enable the reader to apply their newly acquired knowledge Key features: Covers the major topics in nonlinear aeroelasticity, from the galloping of cables to supersonic panel flutter Discusses nonlinear dynamics, bifurcation analysis, numerical continuation, unsteady aerodynamics and non-smooth systems Considers the practical application of the theories and methods Covers nonlinear dynamics, bifurcation analysis and numerical methods Accompanied by a website hosting Matlab code Introduction to Nonlinear Aeroelasticity is a comprehensive reference for researchers and workers in industry and is also a useful introduction to the subject for graduate and undergraduate students across engineering disciplines.
Download or read book Introduction to Aircraft Aeroelasticity and Loads written by Jan Robert Wright and published by John Wiley & Sons. This book was released on 2008-02-28 with total page 559 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aeroelastic phenomena arising from the interaction of aerodynamic, elastic and inertia forces, and the loads resulting from flight / ground manoeuvres and gust / turbulence encounters, have a significant influence upon aircraft design. The prediction of aircraft aeroelastic stability, response and loads requires application of a range of interrelated engineering disciplines. This new textbook introduces the foundations of aeroelasticity and loads for the flexible aircraft, providing an understanding of the main concepts involved and relating them to aircraft behaviour and industrial practice. This book includes the use of simplified mathematical models to demonstrate key aeroelastic and loads phenomena including flutter, divergence, control effectiveness and the response and loads resulting from flight / ground manoeuvres and gust / turbulence encounters. It provides an introduction to some up-to-date methodologies for aeroelastics and loads modelling. It lays emphasis on the strong link between aeroelasticity and loads. It also includes provision of MATLAB and SIMULINK programs for the simplified analyses. It offers an overview of typical industrial practice in meeting certification requirements.
Download or read book Flutter of Low Aspect ratio Wings Calculation of pressure distribution for oscillating wings of arbitrary planform in subsonic flow by the kernel function methods by Pao Tan Hsu written by Massachusetts Institute of Technology and published by . This book was released on 1957 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Improved Methodology for Advanced Aircraft Design written by William A. Crossley and published by . This book was released on 2004 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: A set of related topics address aircraft that are significantly different from traditional aircraft. All of the effort relied upon multidisciplinary analysis tools, including finite element modeling, computational aerodynamic prediction, and aeroelastic analysis. An initial investigation focused upon aeroelastic modeling and related design approaches for joined-wing aircraft. Subsequent investigations focused upon design approaches for morphing aircraft.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamics and Aeroelasticity of Composite Structures written by John Dugundji and published by . This book was released on 1986 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: An analytical and experimental investigation was made of the aeroelastic flutter and divergence behavior of graphite/ epoxy forward swept wings with rigid body pitch and plunge freedoms present. A complete, two-sided 30-degree forward swept wing aircraft model was constructed and mounted with low friction bearing in a low speed wind tunnel. Four different ply layup wings could be interchanged on the model, namely, [02/90] s', [15/2/0]s', [30/2/0]s', and [-152/0]s'. Wind tunnel tests on the "free" flying models revealed body freedom flutter, bending torsion flutter, and a support dynamic instability which could be eliminated by proper adjustment of the support stiffness. Good agreement with linear theory was found for the observed instabilities
Download or read book Influence of Structural and Aerodynamic Modeling on Flutter Analysis and Structural Optimization written by Alfred G. Struz and published by . This book was released on 1991 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The influences of structural and aerodynamic modeling on the flutter analysis and multidisciplinary optimization of fully built-up finite element wing models in an aeroelastic environment are not yet well understood. Therefore, the dynamic aeroelastic and optimization capabilities in the Automated Structural Optimization System (ASTROS) were used to evalute the flutter behavior and the behavior of structural optimization with flutter constraints of various representative fully built-up finite element wing models in subsonic and supersonic flow. ASTROS was here used as a tool to calculate flutter speeds and frequencies and to minimize the weight of these wing models n subsonic and supersonic flow under given flutter and frequency constraints to determine the effect that these modeling factors have."--Report documentation page.
Download or read book Aeroelastic Variability and Uncertainty of Composite Aircraft written by Eli Livne and published by . This book was released on 2017 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes the work done at the University of Washington to contribute to the development of aeroelastic technology for the emerging fleet of composite airframe passenger and cargo aircraft. The objectives were to develop a probabilistic method to estimate aeroelastic reliabilities suitable for design, inspection, and regulatory compliance and to develop efficient, practical numerical simulation techniques for nonlinear composite airframes. Three test cases were studied: a two-dimensional (2D) airfoil/aileron, a 3-dimensional (3D) finite element-based low aspect ratio fighter-type wing/flaperon, and a composite vertical tail/rudder model. The first test case started with a simple 2D model and progressed to more complicated 3D models. The first two test cases were used to simulate linear flutter and gust response behavior as well as nonlinear behavior due to freeplay or other local nonlinearities. The third case focused on the flutter reliability of a passenger aircraft's composite vertical tail/rudder system. The probabilistic methods used in this study effectively quantified the flutter reliability but were case-dependent.
Download or read book Aeroelastic Stability and Performance Characteristics of Aircraft with Advanced Composite Sweptforward Wing Structures written by Terrence A. Weisshaar and published by . This book was released on 1978 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sweptforward metallic wings have not been considered to be a serious design concept for nearly thirty years. The large structural weights necessary to preclude aeroelastic divergence of metallic wing structures are unfavorable when compared to similar sweptback designs, designs that are usually divergence free. The development of fibrous laminated composite materials and the fact that forward swept wings may have superior aerodynamic performance has led to renewed interest in this design. In this report, laminated beam theory, together with aerodynamic strip theory, is used to predict the static aeroelastic divergence characteristics of swept wings. From the results of this theory, it is predicted that, because of elastic coupling between bending and torsional deformation of the wing box, laminated composites may be used to preclude wing divergence for a large range of wing forward sweep angles. Formulas are developed to illustrate the important parameters governing composite wing divergence. Two examples are presented to illustrate the use of these formulas. These examples show that composite forward swept wings have the potential to be feasible, efficient designs.
Download or read book Manual on Aeroelasticity written by North Atlantic Treaty Organization. Advisory Group for Aeronautical Research and Development. Structures and Materials Panel and published by . This book was released on 1968 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:
