Download or read book Integration of a Code for Aeroelastic Design of Conventional and Composite Wings Into ACSYNT an Aircraft Synthesis Program written by and published by . This book was released on 1976 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1982 with total page 1282 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Download or read book NASA SP written by and published by . This book was released on 1988 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Continued Development and Correlation of Analytically Based Weight Estimation Codes for Wings and Fuselages written by and published by . This book was released on 1978 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1982 with total page 1262 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aeronautical Engineering written by and published by . This book was released on 1989 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt: A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA).

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 Aeroelastic Tailoring with Composites Applied to Forward Swept Wings written by T. J. Hertz and published by . This book was released on 1981 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: The application of aeroelastic tailoring with advanced composites has made forward swept wings a viable configuration option for high performance aircraft. Forward swept wings have an inherent tendency to encounter a static aeroelastic instability called divergence. The extreme weight penalty required to avoid this instability in conventional metallic construction has been the basis for the reluctance of designers to incorporate forward sweep in aircraft. Studies performed for the Flight Dynamics Laboratory and by others independently show that, through the use of aeroelastic tailoring (the design process that makes use of the directional properties of fibrous composite materials in wing skins and orients these materials in optimum directions) with advanced composite material, the aeroelastic behavior of a conventional aft swept wing can be controlled and forward swept wings can be constructed with composites that results in an increase in the divergence speed without a prohibitive increase in weight. This report presents the background and evolution of aeroelastic tailoring as applied to forward swept wings together with a summary of work required to establish an aeroelastic data base for forward swept design.

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 Performance Improvement of Composite Wings Through Aeroelastic Tailoring and Modern Control written by and published by . This book was released on 1995 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research has been carried out simultaneously on three aspects of aircraft wings performance optimization, as follows: (1) Structural tailoring and modern control of thin-walled model of composite aircraft wings; (2) Structural tailoring of a low-aspect ratio plate model of composite aircraft wings; and (3) Integrated structural design and vibration control by multiobjective optimization. Significant progress has been made on all fronts.

Download or read book Aeronautical Engineering A Cumulative Index to a Continuing Bibliography supplement 235 written by and published by . This book was released on 1989 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Study on Utilization of Advanced Composites in Commercial Aircraft Wing Structures Volume 1 Executive Summary written by and published by . This book was released on 1978 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effort required by commercial transport manufacturers to accomplish the transition from current construction materials and practices to extensive use of composites in aircraft wings was investigated. The engineering and manufacturing disciplines which normally participate in the design, development, and production of an aircraft were employed to ensure that all of the factors that would enter a decision to commit to production of a composite wing structure were addressed. A conceptual design of an advanced technology reduced energy aircraft provided the framework for identifying and investigating unique design aspects. A plan development effort defined the essential technology needs and formulated approaches for effecting the required wing development. The wing development program plans, resource needs, and recommendations are summarized.

Download or read book Aerospace America written by and published by . This book was released on 1994 with total page 678 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Composite Wing for Transonic Improvement Volume II Advanced Analysis Evaluation written by M. E. Waddoups and published by . This book was released on 1971 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt: The program to provide technical support leading to a composite wing for an aircraft transonic improvement program included technology investigations to establish the feasibility of aeroelastic synthesis for composite wing structures. Modifications were made to an existing direct Rayleigh-Ritz anisotropic plate analysis procedure and the resulting procedure was compared with the finite element method for the analysis of wing structures and correlated with experimental data. The results of this investigation and a preliminary formulation of an aeroelastic synthesis procedure are documented in this volume for future systems support reference. (Author).

Download or read book Control Augmented Structural Optimization of Aeroelasticity Tailored Fiber Composite Wings written by and published by . This book was released on 1991 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: The problem of control augmented structural optimization of aeroelastically tailored fiber composite wings was addressed in a series of comprehensive studies. This research culminated in the first truly integrated, practical computer program capable of treating this multidisciplinary synthesis problem by simultaneously changing structural, aerodynamic and control type design variables for practical aircraft configurations. The effectiveness and efficiency of this integrated aeroscervoelastic optimization capability was displayed by applying it to an RPV type vehicle as well as the more complex F-16 and X-29 type airplane models. In addition, within the framework of this research a digital adaptive controller capable of suppressing flutter in composite wings under time varying flight conditions in subsonic and transonic flow was developed. This efficient analysis can be used as the basis for structural optimization studies of actively controlled composite wings in transonic flow.

Download or read book Development of a Composite Tailoring Technique for Airplane Wing 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 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Development of a new composite beam modeling technique to represent the principal load-carrying member in the wing is reported along with the development of a formal design optimization procedure to investigate the effect of composite tailoring on aeroelastic stability and structural characteristics of airplane wings. The developed procedure is used to perform design optimization studies on realistic airplane configurations to investigate the various aeroelastic/structural/dynamic design issues. Chattopadhyay, Aditi and Jha, Ratneshwar Ames Research Center NASA-CR-205326, NAS 1.26:205326 NAG2-908...

Download or read book Aeroelastic Tailoring of Composite Aircraft Wings with Uncertainty Quantification for Robust and Reliable Design written by Muhammad F. B. Othman and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: