Modeling Of Aircraft Unsteady Aerodynamic Characteristics Part 1 Postulated Models

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Modeling of Aircraft Unsteady Aerodynamic Characteristics. Part 1

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Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781722379582
Total Pages : 28 pages
Book Rating : 4.3/5 (795 download)

Book Synopsis Modeling of Aircraft Unsteady Aerodynamic Characteristics. Part 1 by : National Aeronautics and Space Administration (NASA)

Download or read book Modeling of Aircraft Unsteady Aerodynamic Characteristics. Part 1 written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-05 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: A short theoretical study of aircraft aerodynamic model equations with unsteady effects is presented. The aerodynamic forces and moments are expressed in terms of indicial functions or internal state variables. The first representation leads to aircraft integro-differential equations of motion; the second preserves the state-space form of the model equations. The formulations of unsteady aerodynamics is applied in two examples. The first example deals with a one-degree-of-freedom harmonic motion about one of the aircraft body axes. In the second example, the equations for longitudinal short-period motion are developed. In these examples, only linear aerodynamic terms are considered. The indicial functions are postulated as simple exponentials and the internal state variables are governed by linear, time-invariant, first-order differential equations. It is shown that both approaches to the modeling of unsteady aerodynamics lead to identical models. Klein, Vladislav and Noderer, Keith D. Langley Research Center RTOP 505-64-52-01...

Modeling of Aircraft Unsteady Aerodynamic Characteristics. Part 2: Parameters Estimated from Wind Tunnel Data

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ISBN 13 :
Total Pages : 46 pages
Book Rating : 4.:/5 (317 download)

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Download or read book Modeling of Aircraft Unsteady Aerodynamic Characteristics. Part 2: Parameters Estimated from Wind Tunnel Data written by and published by . This book was released on 1995 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Modeling of Aircraft Unsteady Aerodynamic Characteristics. Part 2: Parameters Estimated from Wind Tunnel Data

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Author : National Aeronautics and Space Adm Nasa
Publisher : Independently Published
ISBN 13 : 9781729346334
Total Pages : 46 pages
Book Rating : 4.3/5 (463 download)

Book Synopsis Modeling of Aircraft Unsteady Aerodynamic Characteristics. Part 2: Parameters Estimated from Wind Tunnel Data by : National Aeronautics and Space Adm Nasa

Download or read book Modeling of Aircraft Unsteady Aerodynamic Characteristics. Part 2: Parameters Estimated from Wind Tunnel Data written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-10-28 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aerodynamic equations with unsteady effects were formulated for an aircraft in one-degree-of-freedom, small-amplitude, harmonic motion. These equations were used as a model for aerodynamic parameter estimation from wind tunnel oscillatory data. The estimation algorithm was based on nonlinear least squares and was applied in three examples to the oscillatory data in pitch and roll of 70 deg triangular wing and an X-31 model, and in-sideslip oscillatory data of the High Incidence Research Model 2 (HIRM 2). All three examples indicated that a model using a simple indicial function can explain unsteady effects observed in measured data. The accuracy of the estimated parameters and model verification were strongly influenced by the number of data points with respect to the number of unknown parameters. Klein, Vladislav and Noderer, Keith D. Langley Research Center RTOP 505-64-52-01...

Modeling of Aircraft Unsteady Aerodynamic Characteristics. Part 1: Postulated Models

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ISBN 13 :
Total Pages : 30 pages
Book Rating : 4.:/5 (317 download)

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Download or read book Modeling of Aircraft Unsteady Aerodynamic Characteristics. Part 1: Postulated Models written by and published by . This book was released on 1994 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Computational Aerodynamic Modeling of Aerospace Vehicles

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Author : Mehdi Ghoreyshi
Publisher : MDPI
ISBN 13 : 3038976105
Total Pages : 294 pages
Book Rating : 4.0/5 (389 download)

Book Synopsis Computational Aerodynamic Modeling of Aerospace Vehicles by : Mehdi Ghoreyshi

Download or read book Computational Aerodynamic Modeling of Aerospace Vehicles written by Mehdi Ghoreyshi and published by MDPI. This book was released on 2019-03-08 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: Currently, the use of computational fluid dynamics (CFD) solutions is considered as the state-of-the-art in the modeling of unsteady nonlinear flow physics and offers an early and improved understanding of air vehicle aerodynamics and stability and control characteristics. This Special Issue covers recent computational efforts on simulation of aerospace vehicles including fighter aircraft, rotorcraft, propeller driven vehicles, unmanned vehicle, projectiles, and air drop configurations. The complex flow physics of these configurations pose significant challenges in CFD modeling. Some of these challenges include prediction of vortical flows and shock waves, rapid maneuvering aircraft with fast moving control surfaces, and interactions between propellers and wing, fluid and structure, boundary layer and shock waves. Additional topic of interest in this Special Issue is the use of CFD tools in aircraft design and flight mechanics. The problem with these applications is the computational cost involved, particularly if this is viewed as a brute-force calculation of vehicle’s aerodynamics through its flight envelope. To make progress in routinely using of CFD in aircraft design, methods based on sampling, model updating and system identification should be considered.

Scientific and Technical Aerospace Reports

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Publisher :
ISBN 13 :
Total Pages : 892 pages
Book Rating : 4.:/5 (31 download)

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Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Modeling of Longitudinal Unsteady Aerodynamics of a Wing-Tail Combination

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Author : National Aeronautics and Space Adm Nasa
Publisher : Independently Published
ISBN 13 : 9781723743511
Total Pages : 34 pages
Book Rating : 4.7/5 (435 download)

Book Synopsis Modeling of Longitudinal Unsteady Aerodynamics of a Wing-Tail Combination by : National Aeronautics and Space Adm Nasa

Download or read book Modeling of Longitudinal Unsteady Aerodynamics of a Wing-Tail Combination written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-09-16 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aerodynamic equations for the longitudinal motion of an aircraft with a horizontal tail were developed. In this development emphasis was given on obtaining model structure suitable for model identification from experimental data. The resulting aerodynamic models included unsteady effects in the form of linear indicial functions. These functions represented responses in the lift on the wing and tail alone, and interference between those two lifting surfaces. The effect of the wing on the tail was formulated for two different expressions concerning the downwash angle at the tail. The first expression used the Cowley-Glauert approximation known-as "lag-in-downwash," the second took into account growth of the wing circulation and delay in the development of the lift on the tail. Both approaches were demonstrated in two examples using the geometry of a fighter aircraft and a large transport. It was shown that the differences in the two downwash formulations would increase for an aircraft with long tail arm performing low-speed, rapid maneuvers.Klein, VladislavLangley Research CenterUNSTEADY AERODYNAMICS; AERODYNAMIC CHARACTERISTICS; AERODYNAMIC STABILITY; LONGITUDINAL STABILITY; LIFT; PITCHING MOMENTS; WIND TUNNEL TESTS; BODY-WING AND TAIL CONFIGURATIONS; WINGS; TAIL ASSEMBLIES; DOWNWASH; FIGHTER AIRCRAFT

Aerodynamic Modeling for Aircraft in Unsteady Flight Conditions

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Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781720373018
Total Pages : 56 pages
Book Rating : 4.3/5 (73 download)

Book Synopsis Aerodynamic Modeling for Aircraft in Unsteady Flight Conditions by : National Aeronautics and Space Administration (NASA)

Download or read book Aerodynamic Modeling for Aircraft in Unsteady Flight Conditions written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-29 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes the activities in unsteady aerodynamic modeling and application of unsteady aerodynamic models to flight dynamics. A public on briefing was presented on July 21, 1999 at Langley Research Center.Lan, C. EdwardLangley Research CenterAERODYNAMIC CHARACTERISTICS; FLIGHT CONDITIONS; UNSTEADY AERODYNAMICS; MATHEMATICAL MODELS; FUZZY SYSTEMS; FLOW DISTRIBUTION; CONVOLUTION INTEGRALS; NONLINEARITY; FOURIER ANALYSIS

Monthly Catalogue, United States Public Documents

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Publisher :
ISBN 13 :
Total Pages : 1994 pages
Book Rating : 4.:/5 (31 download)

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Download or read book Monthly Catalogue, United States Public Documents written by and published by . This book was released on 1995 with total page 1994 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Flow Phenomena in Nature: A challenge to engineering design

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Author : Roland Liebe
Publisher : WIT Press
ISBN 13 : 1845640012
Total Pages : 418 pages
Book Rating : 4.8/5 (456 download)

Book Synopsis Flow Phenomena in Nature: A challenge to engineering design by : Roland Liebe

Download or read book Flow Phenomena in Nature: A challenge to engineering design written by Roland Liebe and published by WIT Press. This book was released on 2007 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: Do we have an adequate understanding of fluid dynamics phenomena in nature and evolution, and what physical models do we need? What can we learn from nature to stimulate innovations in thinking as well as in engineering applications? Concentrating on flight and propulsion, this unique and accessible book compares fluid dynamics solutions in nature with those in engineering. The respected international contributors present up-to-date research in an easy to understand manner, giving common viewpoints from fields such as zoology, engineering, biology, fluid mechanics and physics. Contents: Introduction to Fluid Dynamics; Swimming and Flying in Nature; Generation of Forces in Fluids - Current Understanding; The Finite, Natural Vortex in Steady and Unsteady Fluid Dynamics - New Modelling; Applications in Engineering with Inspirations From Nature; Modern Experimental and Numerical Methods in Fluid Dynamics.

Analysis of Wind Tunnel Longitudinal Static and Oscillatory Data of the F-16XL Aircraft

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Publisher :
ISBN 13 :
Total Pages : 70 pages
Book Rating : 4.:/5 (317 download)

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Download or read book Analysis of Wind Tunnel Longitudinal Static and Oscillatory Data of the F-16XL Aircraft written by and published by . This book was released on 1997 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:

NASA Technical Memorandum

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ISBN 13 :
Total Pages : 182 pages
Book Rating : 4.F/5 ( download)

Book Synopsis NASA Technical Memorandum by :

Download or read book NASA Technical Memorandum written by and published by . This book was released on 1963 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Fourier Functional Analysis for Unsteady Aerodynamic Modeling

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Author : National Aeronautics and Space Adm Nasa
Publisher :
ISBN 13 : 9781731004130
Total Pages : 102 pages
Book Rating : 4.0/5 (41 download)

Book Synopsis Fourier Functional Analysis for Unsteady Aerodynamic Modeling by : National Aeronautics and Space Adm Nasa

Download or read book Fourier Functional Analysis for Unsteady Aerodynamic Modeling written by National Aeronautics and Space Adm Nasa and published by . This book was released on 2018-11-07 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: A method based on Fourier analysis is developed to analyze the force and moment data obtained in large amplitude forced oscillation tests at high angles of attack. The aerodynamic models for normal force, lift, drag, and pitching moment coefficients are built up from a set of aerodynamic responses to harmonic motions at different frequencies. Based on the aerodynamic models of harmonic data, the indicial responses are formed. The final expressions for the models involve time integrals of the indicial type advocated by Tobak and Schiff. Results from linear two- and three-dimensional unsteady aerodynamic theories as well as test data for a 70-degree delta wing are used to verify the models. It is shown that the present modeling method is accurate in producing the aerodynamic responses to harmonic motions and the ramp type motions. The model also produces correct trend for a 70-degree delta wing in harmonic motion with different mean angles-of-attack. However, the current model cannot be used to extrapolate data to higher angles-of-attack than that of the harmonic motions which form the aerodynamic model. For linear ramp motions, a special method is used to calculate the corresponding frequency and phase angle at a given time. The calculated results from modeling show a higher lift peak for linear ramp motion than for harmonic ramp motion. The current model also shows reasonably good results for the lift responses at different angles of attack. Lan, C. Edward and Chin, Suei Unspecified Center AERODYNAMIC CHARACTERISTICS; AIRCRAFT MODELS; FORCED VIBRATION; FOURIER ANALYSIS; FUNCTIONAL ANALYSIS; MATHEMATICAL MODELS; UNSTEADY AERODYNAMICS; AERODYNAMIC DRAG; ANGLE OF ATTACK; DELTA WINGS; DYNAMIC RESPONSE; HARMONIC MOTION; LIFT; MOMENT DISTRIBUTION; PITCHING MOMENTS...

Advanced Flight Dynamics with Elements of Flight Control

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Author : Nandan K. Sinha
Publisher : CRC Press
ISBN 13 : 1351648012
Total Pages : 311 pages
Book Rating : 4.3/5 (516 download)

Book Synopsis Advanced Flight Dynamics with Elements of Flight Control by : Nandan K. Sinha

Download or read book Advanced Flight Dynamics with Elements of Flight Control written by Nandan K. Sinha and published by CRC Press. This book was released on 2017-06-27 with total page 311 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced Flight Dynamics aim to integrate the subjects of aircraft performance, trim and stability/control in a seamless manner. Advanced Flight Dynamics highlights three key and unique viewpoints. Firstly, it follows the revised and corrected aerodynamic modeling presented previously in recent textbook on Elementary Flight Dynamics. Secondly, it uses bifurcation and continuation theory, especially the Extended Bifurcation Analysis (EBA) procedure devised by the authors, to blend the subjects of aircraft performance, trim and stability, and flight control into a unified whole. Thirdly, rather than select one control design tool or another, it uses the generalized Nonlinear Dynamic Inversion (NDI) methodology to illustrate the fundamental principles of flight control. Advanced Flight Dynamics covers all the standard airplane maneuvers, various types of instabilities normally encountered in flight dynamics and illustrates them with real-life airplane data and examples, thus bridging the gap between the teaching of flight dynamics/ control theory in the university and its practice in airplane design bureaus. The expected reader group for this book would ideally be senior undergraduate and graduate students, practicing aerospace/flight simulation engineers/scientists from industry as well as researchers in various organizations. Key Features: Focus on unified nonlinear approach, with nonlinear analysis tools. Provides an up-to-date, corrected, and unified presentation of aircraft trim, stability and control analysis including nonlinear phenomena and closed-loop stability analysis. Contains a computational tool and real-life example carried through the chapters. Includes complementary nonlinear dynamic inversion control approach, with relevant aircraft examples. Fills the gap in the market for a text including non-linear flight dynamics and continuation methods.

Recent Advances in Experimental Mechanics

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Author : E.E. Gdoutos
Publisher : Springer Science & Business Media
ISBN 13 : 0306484102
Total Pages : 834 pages
Book Rating : 4.3/5 (64 download)

Book Synopsis Recent Advances in Experimental Mechanics by : E.E. Gdoutos

Download or read book Recent Advances in Experimental Mechanics written by E.E. Gdoutos and published by Springer Science & Business Media. This book was released on 2007-05-08 with total page 834 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains 71 papers presented at the symposium on “Recent Advances in Experimental Mechanics” which was organized in honor of Professor Isaac M. Daniel. The symposium took place at Virginia Polytechnic Institute and State University on th June 23-28, 2002, in conjunction with the 14 US National Congress of Applied Mechanics. The book is a tribute to Isaac Daniel, a pioneer of experimental mechanics and composite materials, in recognition of his continuous, original, diversified and outstanding contributions for half a century. The book consists of invited papers written by leading experts in the field. It contains original contributions concerning the latest developments in experimental mechanics. It covers a wide range of subjects, including optical methods of stress analysis (photoelasticity, moiré, etc.), composite materials, sandwich construction, fracture mechanics, fatigue and damage, nondestructive evaluation, dynamic problems, fiber optic sensors, speckle metrology, digital image processing, nanotechnology, neutron diffraction and synchrotron radiation methods. The papers are arranged in the following nine sections: Mechanical characterization of material behavior, composite materials, fracture and fatigue, optical methods, n- destructive evaluation, neutron diffraction and synchrotron radiation methods, hybrid methods, composite structures, and structural testing and analysis.

Journal of Aircraft

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ISBN 13 :
Total Pages : 756 pages
Book Rating : 4.:/5 (318 download)

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Download or read book Journal of Aircraft written by and published by . This book was released on 2009 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Monthly Catalog of United States Government Publications

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ISBN 13 :
Total Pages : 866 pages
Book Rating : 4.3/5 ( download)

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Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1995 with total page 866 pages. Available in PDF, EPUB and Kindle. Book excerpt: