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Unsteady Aerodynamic Modeling Of Dynamic Oscillatory Wind Tunnel Data Of The 18 Scale F 16xl Aircraft
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Book Synopsis Unsteady Aerodynamic Modeling of Dynamic Oscillatory Wind Tunnel Data of the 18% Scale F-16XL Aircraft by : Nathan Mulcahey Szyba
Download or read book Unsteady Aerodynamic Modeling of Dynamic Oscillatory Wind Tunnel Data of the 18% Scale F-16XL Aircraft written by Nathan Mulcahey Szyba and published by . This book was released on 2004 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721142163 Total Pages :114 pages Book Rating :4.1/5 (421 download)
Book Synopsis Analysis of Wind Tunnel Lateral Oscillatory Data of the F-16xl Aircraft by : National Aeronautics and Space Administration (NASA)
Download or read book Analysis of Wind Tunnel Lateral Oscillatory Data of the F-16xl Aircraft written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-15 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: Static and dynamic wind tunnel tests were performed on an 18% scale model of the F-16XL aircraft. These tests were performed over a wide range of angles of attack and sideslip with oscillation amplitudes from 5 deg. to 30 deg. and reduced frequencies from 0.073 to 0.269. Harmonic analysis was used to estimate Fourier coefficients and in-phase and out-of-phase components. For frequency dependent data from rolling oscillations, a two-step regression method was used to obtain unsteady models (indicial functions), and derivatives due to sideslip angle, roll rate and yaw rate from in-phase and out-of-phase components. Frequency dependence was found for angles of attack between 20 deg. and 50 deg. Reduced values of coefficient of determination and increased values of fit error were found for angles of attack between 35 deg. and 45 deg. An attempt to estimate model parameters from yaw oscillations failed, probably due to the low number of test cases at different frequencies. Klein, Vladislav and Murphy, Patrick C. and Szyba, Nathan M. Langley Research Center 23-762-45-DB
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722237172 Total Pages :68 pages Book Rating :4.2/5 (371 download)
Book Synopsis Analysis of Wind Tunnel Longitudinal Static and Oscillatory Data of the F-16xl Aircraft by : National Aeronautics and Space Administration (NASA)
Download or read book Analysis of Wind Tunnel Longitudinal Static and Oscillatory Data of the F-16xl Aircraft written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-06 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Static and oscillatory wind tunnel data are presented for a 10-percent-scale model of an F-16XL aircraft. Static data include the effect of angle of attack, sideslip angle, and control surface deflections on aerodynamic coefficients. Dynamic data from small-amplitude oscillatory tests are presented at nominal values of angle of attack between 20 and 60 degrees. Model oscillations were performed at five frequencies from 0.6 to 2.9 Hz and one amplitude of 5 degrees. A simple harmonic analysis of the oscillatory data provided Fourier coefficients associated with the in-phase and out-of-phase components of the aerodynamic coefficients. A strong dependence of the oscillatory data on frequency led to the development of models with unsteady terms in the form of indicial functions. Two models expressing the variation of the in-phase and out-of-phase components with angle of attack and frequency were proposed and their parameters estimated from measured data. Klein, Vladislav and Murphy, Patrick C. and Curry, Timothy J. and Brandon, Jay M. Langley Research Center...
Book Synopsis Analysis of Wind Tunnel Longitudinal Static and Oscillatory Data of the F-16XL Aircraft by :
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:
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...
Book Synopsis Modeling of Aircraft Unsteady Aerodynamic Characteristics by : Vladislav Klein
Download or read book Modeling of Aircraft Unsteady Aerodynamic Characteristics written by Vladislav Klein and published by . This book was released on 1994 with total page 41 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 degree 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.
Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781723776687 Total Pages :128 pages Book Rating :4.7/5 (766 download)
Book Synopsis Analysis of Wind Tunnel Oscillatory Data of the X-31a Aircraft by : National Aeronautics and Space Adm Nasa
Download or read book Analysis of Wind Tunnel Oscillatory Data of the X-31a Aircraft written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-09-17 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wind tunnel oscillatory tests in pitch, roll, and yaw were performed on a 19%-scale model of the X-31A aircraft. These tests were used to study the aerodynamic characteristics of the X-31A in response to harmonic oscillations at six frequencies. In-phase and out-of-phase components of the aerodynamic coefficients were obtained over a range of angles of attack from 0 to 90 deg. To account for the effect of frequency on the data, mathematical models with unsteady terms were formulated by use of two different indicial functions. Data from a reduced set of frequencies were used to estimate model parameters, including steady-state static and dynamic stability derivatives. Both models showed good prediction capability and the ability to accurately fit the measured data. Estimated static stability derivatives compared well with those obtained from static wind tunnel tests. The roll and yaw rate derivative estimates were compared with rotary-balanced wind tunnel data and theoretical predictions. The estimates and theoretical predictions were in agreement at small angles of attack. The rotary-balance data showed, in general, acceptable agreement with the steady-state derivative estimates. Smith, Mark S. Langley Research Center NCC1-24; RTOP 522-25-21-07
Book Synopsis Wind Tunnel/flight Data Correlation (u). by : James A. Behal
Download or read book Wind Tunnel/flight Data Correlation (u). written by James A. Behal and published by . This book was released on 1971 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt: A program was conducted to obtain data, both steady state and dynamic, from wind tunnel models and full scale flight tests of the RA-5C aircraft. Data were acquired on 0.228 and 0. 125 scale RA-5C inlet models and on a fully instrumented flight test RA-5C aircraft. Interim data reports presenting the data acquired during each test have been published. These data were utilized in this report to develop scaling techniques for correlating small scale model wind tunnel data with full scale flight data. Data presented include duct steady state operating characteristics and pressure distributions in the inlet and at the engine face. Dynamic data are presented in the form of engine face turbulence contour plots, radial turbulence distributions and selected spectral data functions. Data are presented for variations of angle of attack, angle of yaw, Reynolds number, ramp angle, secondary flow rates and inlet diverter width. Brief descriptions of the model and test methods are also presented.
Book Synopsis Integrated Experimental and Numerical Research on the Aerodynamics of Unsteady Moving Aircraft by :
Download or read book Integrated Experimental and Numerical Research on the Aerodynamics of Unsteady Moving Aircraft written by and published by . This book was released on 2007 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: For the experimental determination of the dynamic wind tunnel data a new combined motion test capability was developed at the German-Dutch Wind Tunnels DNW for their 3m Low Speed Wind Tunnel NWB in Braunschweig, Germany, using a unique six degree-of-freedom test rig called?Model Positioning Mechanism? (MPM) as an improved successor to the older systems. With that cutting-edge device several transport aircraft configurations including a blended wing body configuration were tested in different modes of oscillatory motions roll, pitch and yaw as well as delta wing geometries like X-31 equipped with remote controlled rudders and flaps to be able to simulate realistic flight maneuvers, e.g. a dutch-roll. This paper describes the motivation behind these tests and the test setup and in addition gives a short introduction into time accurate maneuver testing capabilities incorporating models with remote controlled control surfaces. Furthermore, the adaptation of numerical methods for the prediction of dynamic derivatives is described and some examples with the DLR-F12 configuration will be given. The calculations are based on RANS-solution using the finite volume parallel solution algorithm with an unstructured discretization concept (DLR TAU-code).
Book Synopsis Wind Tunnel/flight Data Correlation (u). by : James A. Behal
Download or read book Wind Tunnel/flight Data Correlation (u). written by James A. Behal and published by . This book was released on 1971 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt: A program was conducted to obtain data, both steady state and dynamic, from wind tunnel models and full scale flight tests of the RA-5C aircraft. Data were acquired on 0.228 and 0. 125 scale RA-5C inlet models and on a fully instrumented flight test RA-5C aircraft. Interim data reports presenting the data acquired during each test have been published. These data were utilized in this report to develop scaling techniques for correlating small scale model wind tunnel data with full scale flight data. Data presented include duct steady state operating characteristics and pressure distributions in the inlet and at the engine face. Dynamic data are presented in the form of engine face turbulence contour plots, radial turbulence distributions and selected spectral data functions. Data are presented for variations of angle of attack, angle of yaw, Reynolds number, ramp angle, secondary flow rates and inlet diverter width. Brief descriptions of the model and test methods are also presented.
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 1042 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Longitudinal Airplane Dynamics Wind Tunnel Test Equipment by : O. B. Tufts
Download or read book Longitudinal Airplane Dynamics Wind Tunnel Test Equipment written by O. B. Tufts and published by . This book was released on 1955 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Small Scale Model Tests in Small Wind and Water Tunnels at High Incidence and Pitch Rates. Volume 2. Small Wind Tunnel (ADF) Data Base by : Atlee M Cunningham (Jr)
Download or read book Small Scale Model Tests in Small Wind and Water Tunnels at High Incidence and Pitch Rates. Volume 2. Small Wind Tunnel (ADF) Data Base written by Atlee M Cunningham (Jr) and published by . This book was released on 1989 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: Force testing of small-scale models in either a small wind tunnel or a water tunnel was investigated as an inexpensive and quick means to obtain meaningful dynamic force and moment data representative of rapidly maneuvering full-scale aircraft. Force tests of flat-plate semi-span models were conducted in the General Dynamics Aerodynamic Development Facility (ADF) which is a small 14-in. x 14-in. low speed wind tunnel. Oscillatory model motions up to 48 deg (peak to peak) amplitude were tested at frequencies of 1 to 3 Hz. Force tests of flat and three-dimensional full span models were conducted in G.D.'s Hydroflow Facility (HFF) which is a horizontal flow water tunnel with a 24-in. x 24-in. test section. Pitch/pulse model motions were tested for conditions similar to those tested in the ADF. The test velocities were 100 fps in the ADF and 0.8 fps in the HFF which yielded nominal Reynolds numbers of 0.6 million and 0.06 million respectively (based on root chord). This volume presents the data base generated from tests in the ADF. The normal force, pitching moment and rolling moment data are in plotted and tabulated form for the straked wing, 55 deg and 70 deg delta wings and 70 deg/30 deg cranked wing semi-span models. Steady results along with unsteady results for two frequencies are included for the overall incidence range of 0 deg to 80 deg. Geometric data for the models are also given. Keywords: Aerodynamic forces, Unsteady flow, Vortices, Flat plate models, Wind tunnel tests. (EDC).
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis ANALYSIS OF WIND TUNNEL LONGITUDINAL STATIC AND OSCILLATORY DATA OF THE F-16XL AIRCRAFT... NASA/TM-97-206276... FEB. 25, 1998 by : United States. National Aeronautics and Space Administration
Download or read book ANALYSIS OF WIND TUNNEL LONGITUDINAL STATIC AND OSCILLATORY DATA OF THE F-16XL AIRCRAFT... NASA/TM-97-206276... FEB. 25, 1998 written by United States. National Aeronautics and Space Administration and published by . This book was released on 1999* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Full-scale Wind-tunnel Investigation of the Aerodynamic Characteristics of the X-24A Lifting Body Aircraft by : Kenneth W. Mort
Download or read book Full-scale Wind-tunnel Investigation of the Aerodynamic Characteristics of the X-24A Lifting Body Aircraft written by Kenneth W. Mort and published by . This book was released on 1970 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Generation of Gusts in a Wind Tunnel and Measurement of Unsteady Lift on an Airfoil by : L. C. Garby
Download or read book The Generation of Gusts in a Wind Tunnel and Measurement of Unsteady Lift on an Airfoil written by L. C. Garby and published by . This book was released on 1957 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
