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3 edition of Extraction of aerodynamic parameters for aircraft at extreme flight conditions found in the catalog.

Extraction of aerodynamic parameters for aircraft at extreme flight conditions

Extraction of aerodynamic parameters for aircraft at extreme flight conditions

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  • 25 Currently reading

Published by National Aeronautics and Space Administration, Ames Research Center, Dryden Flight Research Facility, For sale by the National Technical Information Service] in Edwards, Calif, [Springfield, Va .
Written in English

    Subjects:
  • Parameter estimation.,
  • System identification.

  • Edition Notes

    StatementKenneth W. Iliff.
    SeriesNASA technical memorandum -- 86730.
    ContributionsDryden Flight Research Facility.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17835171M

    Aerodynamic scaling to free flight conditions: Past and present In order to produce aircraft at lower cost, the free flight aerodynamic properties have to be determined with as high accuracy as early in the design process as possible, this in order to avoid a costly step back to an earlier design stage to correct potential mistakes Cited by: Aerodynamic parameters of high performance aircraft estimated from wind tunnel and flight test data. [Washington, DC: Springfield, Va: National Aeronautics and Space Administration ; National Technical Information Service, distributor. MLA Citation. Klein, Vladislav. and Murphy, Patrick C. and United States.

    The use of neural partial differentiation (NPD) method to the multi-input-multi-output (MIMO) aircraft system for the online estimation of aerodynamic parameters from flight data is extended. A nonlinear least squares algorithm for aircraft parameter estimation from flight data was developed. The postulated model for the analysis represented longitudinal, short period motion of an aircraft. The corresponding aerodynamic model equations included indicial functions (unsteady terms) and conventional stability and control derivatives. TheFile Size: 1MB.

    Aircraft manufacturers must continually improve the performance of airplanes to maintain their competitiveness. 1. The aerodynamic performance of an aircraft mainly relies on the wing. 2 Supercritical wings have been studied and used for nearly fifty years, and their technology is quite mature. It is hard to improve the performance of a. This is a book for those who seek to understand the fundamental principles underlying aircraft aerodynamic design. It won't provide much guidance relating to designing the details of a particular project but it is very illuminating about what general kind of /5(6).


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Extraction of aerodynamic parameters for aircraft at extreme flight conditions Download PDF EPUB FB2

Extraction of Aerodynamic Parameters for Aircraft at Extreme Flight Cond itions Author: Kenneth W. Iliff Subject: H Keywords: System identification, Parameter estimation, Maximum likelihood, Cost fu nctions, Stability and control, Extreme flight conditions Created Date: 1/25/ PM.

EXTRACTION OF AERODYNAMIC PARAMETERS FOR AIRCRAFT AT EXTREME FLIGHT CONDITIONS SUMMARY Kenneth W. III ff SenIor Staff Scientist NASA Ames Research Center Dryden FlIght Research Facll1ty Edwards, CalIfornia U.S.A. The maX1mum 11kel1hood est1mator has been used to extract stabty and control der1vat1ves fromCited by: 1.

EXTRACTION FROM FLIGHT DATA OF LONGITUDINAL AERODYNAMIC COEFFICIENTS IN MANEUVERING FLIGHT FOR F-8C AIRCRAFT William T. Suit. Langley Research Center.

SUMMARY. Flight-test data have been used to extract the longitudinal aerodynamic parameters of the F-8C aircraft at moderate to high angles of Size: 1MB.

The current strength and limitations associated with obtaining flight-determined aerodynamic coefficients in extreme flight conditions are assessed. The importance of the careful combining of wind tunnel results (or calculations) and flight results and the thorough evaluation of the mathematical model is : K.

Iliff. The current strength and limitations associated with obtaining flight-determined aerodynamic coefficients in extreme flight conditions is assessed.

The importance of the careful combining of wind tunnel results (or calculations) and flight results and the thorough evaluation of the mathematical model is : K. Iliff.

bias and displacement of measuring instruments from the aircraft center of gravity. EXTRACTION OF AERODYNAMIC PARAMETERS The procedure used in extracting aerodynamic parameters from the flight data is basically the maximum likelihood technique of reference 1.

A flow chart depicting the steps involved in the extraction program is given as figure 4File Size: 3MB. EXTRACTION OF AERODYNAMIC PARAMETERS FOR AIRCRAFTAT EXTREME FLIGHT CONDITIONS, Technical Memorandum Authors: K.

Iliff Report Number: NASA-TM Performing Organization: NASA Dryden Flight Research Center, Edwards, CA Availability: Format(s) on-line: PDF (1, KBytes) Report Date: May No. Pages: AERODYNAMIC PARAMETERS OF THE NAVION AIRPLANE EXTRACTED FROM FLIGHT DATA By William T.

Suit Langley Research Center SUMMARY An iterative method, which is characterized as a maximum-likelihood minimum- variance technique, was used to extract the aerodynamic parameters of a Navion airplane from flight Size: 2MB.

Estimation of aircraft aerodynamic parameters from flight data 21 The general form of the state equations for a given system can be written as ~(t) = Ix(t), u(t), 01 ] + # [x(t)] w(t), x(O) = Xo () and the discrete form of the measured equations as z(O=h[x(O, u(i), Ot] + v(i), i= 1, 2 by: Aerodynamics is the science of airflow over airplanes, cars, buildings, and other objects.

Aerodynamic principles are used to find the best ways in which airplanes produce lift, reduce drag, and remain stable (by controlling the shape and size of the wing, the angle at which it is positioned with respect to the airstream, and the flight speed). Validation and Update of Aerodynamic Database at Extreme Flight Regimes.

Aerodynamic database update from the flight tests using system identification techniques is a crucial tool for the development of control laws and high fidelity simulators.

for the aerodynamic model become clear. The normal flight envelope, where FFS aerodynamic models are well validated should be extended to areas with high angles of attack at low and high Mach numbers from takeoff to cruise speeds of - flight. Fig. 2 Upset conditions and requirements for extended aerodynamic model [2].

Get this from a library. Extraction of aerodynamic parameters for aircraft at extreme flight conditions. [Kenneth W Iliff; Dryden Flight Research Facility.]. Aircraft Aerodynamic Parameters. This file contains the parameters of the aerodynamics model.

The aerodynamics model assumes that the aircraft aerodynamic response can be modeled as the some of a number of airfoils. This method allows for various common modelling approaches such as: Fusing the aircraft aerodynamics into one lift.

Smart Icing Systems NASA Review, June 13Aerodynamics and Flight Mechanics Goal: Improve the safety of aircraft in icing conditions. Objective: 1) Develop steady state icing characterization methods and identify aerodynamic sensors. Wind-Tunnel/Flight Correlation Study of Aerodynamic Characteristics of a Large Flexible Supersonic Cruise Airplane (XB) Author: Arnaiz, Henry H., Peterson, Jr., John, Daugherty, James C.

Subject: NASA TP Keywords: Predicted and meaured aerodynamic characteristics, Wind tunnel to flight correlation, Airplane lift and drag, Aerodynamics. Extracting a projectile's optimally fitting drag coefficient curve C df (M) from flight testing data is considered as an optimal tracking control problem (OTCP), where C df (M) is regarded as the control profile, while the flight testing data is the desired trajectory to be optimally by: Aerodynamics of Formation Flight Article (PDF Available) in Journal of Aircraft 43(4) July with 1, Reads How we measure 'reads'.

IDENTIFICATION OF THE AERODYNAMIC COEFFICIENTS OF THE MULTIROLE MANEUVERABLE AIRCRAFT BASED ON UNSTEADY FLIGHT. 5 conditions should use aerodynamic bank data, but in the case of convergence analysis, random values used for the first iteration ((,) (,)) (,) ((,)) (,) (,) 2.

x o x x o k x o k x o x k N k. p t V d t V d t V d t V d t. The improved aerodynamic efficiency of formation flight is a result of induced drag reductions when multiple wings fly in close lateral proximity to one another to take advantage of the upwash.

AERODYNAMIC MODEL Consider a steady level straight flight. For a small deviation from trim condition, the aerodynamiC force and moment, including thrust.

can be represented by linear model equations. For the longitudinal motion of B, Komoda, et al. () constructed the following model in the body-fixed : Kazuya Masui.In Aerodynamic Design of Transport Aircraft, an effort is made to bridge the gap between these two classes of textbooks.

Extreme flight conditions usually set design requirements for tail. Whereas in traditional wind-tunnel experiments, the operating conditions are set by the experimenter, here, the aerodynamic conditions are driven by the vehicle’s own dynamics.

As a result, this methodology could be useful for characterizing the unsteady aerodynamics effects and their coupling with the aircraft flight dynamics, providing Cited by: