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Wednesday, May 13, 2020 | History

3 edition of Robust flutter margin analysis that incorporates flight data found in the catalog.

Robust flutter margin analysis that incorporates flight data

Robust flutter margin analysis that incorporates flight data

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Published by National Aeronautics and Space Administration, Dryden Flight Research Center, National Technical Information Service, distributor in Edwards, Calif, [Springfield, Va .
Written in English

    Subjects:
  • Flutter analysis.,
  • Aeroelasticity.,
  • Mathematical models.,
  • Dynamic structural analysis.

  • Edition Notes

    StatementRick Lind, Martin J. Brenner.
    Series[NASA technical paper] -- NASA/TP-1998-206543., NASA technical paper -- 206543.
    ContributionsBrenner, Martin J., NASA Dryden Flight Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15548681M

    Flight flutter tests must be performed to demonstrate the accuracy of the analysis and prove the airplane is safe to operate. Flutter is critically dependent upon airspeed because the dynamic pressure in the airstream provides the energy for the self-feeding oscillations. The series Advances in Industrial Control aims to report and encourage technology transfer in control engineering. The rapid development of control technology impacts all areas of the control discipline. New theory, new controllers, actuators, sensors, new industrial processes, computer methods.

    Book Chapters D.T. Grant, S. Sorley, "Robust Flutter Margins of an F/A Aircraft from Aeroelastic Flight Data," Journal of Guidance "Progress on an International Collaborative Program on Improved Procedures for the Analysis of Flight Flutter Test Data," International Forum on Aeroelasticity and Structural Dynamics. Aviation: Principles Of Flight: Limitations: Flutter. Flutter is an unstable oscillation which can lead to destruction. Flutter can occur on fixed surfaces, such as the wing or the stabilizer, as well as on control surfaces such as the aileron or the elevator for instance.

    Robust Flutter Analysis for Certification A number of critical parameters which determine the stability of an aeroelastic system are usually obly known to within a certain bound, but not exactly. As the number of these parameters increases with the complexity of the system, performing flutter solutions for all possible parameter values becomes. This might seem strange as divergence is a static aeroelastic instability and flutter analysis in inherently a dynamic stability analysis. When the AIC’s are generated using the DLM, the quasi-steady AIC terms (when the reduced frequency k =0) are actually generated using VLM.


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Robust flutter margin analysis that incorporates flight data Download PDF EPUB FB2

The norm bound for the uncertainty that is needed to ensure the uncertainty levels are not invalidated by the data is scaled into the plant by the parameter α. Robust flutter margins can be com- puted directly from the new scaled plant using algorithm with a desired µ.

the F/A Systems Research Aircraft using uncertainty sets generated by flight data analysis. The robust margins demonstrate flight conditions for flutter may lie closer to the flight envelope.

the F/A Systems Research Aircraft using uncertainty sets generated by flight data analysis. The robust margins demonstrate flight conditions for flutter may lie closer to the flight envelope. Robust Flutter Margin Analysis That Incorporates Flight Data. The mu margins are robust margins that indicate worst-case stability estimates with respect to the defined uncertainty.

Worst-case flutter margins are computed for the F/A Systems Research Aircraft using uncertainty sets generated by flight data analysis. The robust margins demonstrate flight conditions for flutter may lie closer to the flight envelope than previously estimated by p-k analysis.

BibTeX @MISC{Lind98robustflutter, author = {Rick Lind and Martin J. Brenner}, title = {Robust Flutter Margin Analysis That Incorporates Flight Data}, year = {}}. Worst-case flutter margins are computed for the F/A Systems Research Aircraft using uncertainty sets generated by flight data analysis.

The robust margins demonstrate flight conditions for flutter may lie closer to the flight envelope than previously estimated by p-k analysisAuthor: Rick Lind and Martin J.

Brenner. Abstract 1 NOMENCLATURE Author: Rick Lind and Martin J. Brenner. The dashed line is the flutter margin of the true aircraft and decreases with time due to the time-varying mass of the aircraft.

The solid line displays the robust flutter margin and also demonstrates a time-varying behavior due to the calculation of an uncertainty description and Ix at each test point.

– R. Lind and M. Brenner, Robust Flutter Margin Analysis that Incorporates Flight Data, NASA Technical Paper, in preparation. – R. Lind and M. Brenner, “Robust Flutter Margins of an F/A Aircraft from Aeroelastic Flight Data”, AIAA Journal of Guidance, Control and Dynamics, Vol. 20, No. 3, May-Junepp.

Cited by: 4. Statistical evaluation of flutter boundaries from flight flutter test data 3 February | The Aeronautical Journal, Vol.No. A New Approach for Aeroelastic Robust Stability AnalysisCited by:   Robust flutter analysis of a nonlinear aeroelastic system with parametric uncertainties Aerospace Science and Technology, Vol.

13, No. Statistical evaluation of flutter boundaries from flight flutter test dataCited by: Get this from a library. Robust flutter margin analysis that incorporates flight data. [Rick Lind; Martin J Brenner; NASA Dryden Flight Research Center.]. Part of the Advances in Industrial Control book series (AIC) Abstract Robust flutter margins are computed for the F/A Systems Research Aircraft, SRA, which is being flown at NASA Dryden Flight Research Center as Ship [].Author: Rick Lind, Marty Brenner.

A post-flight application uses data sets from multiple test points to compute worst-case flutter margins and a worst-case flight envelope.

An on-line implementation computes flutter margins at Author: Rick Lind. Robust Aeroservoelastic Stability Analysis Flight Test Applications. Authors (view affiliations) Rick Lind; Marty Brenner; Book. Incorporating Flight Data. Rick Lind, Marty Brenner Pages Robust Stability Margins of a Pitch-Plunge System.

Rick Lind, Marty Brenner. Pages Robust Flutter Margins of the F/A SRA. Rick. In this paper, the robust flutter margin is defined as the distance between initial value of flight altitude and the altitude associated with ju (P) = 1 for a certain value of Mach by: 3. Keywords: Flutter, DMAP, GVT, modal data Abstract The Flutter analyses are performed for the KF aircraft with brand new ALQ ECM pod.

A flutter analysis method utilizing test modal data is proposed and validated using published F modal data and flutter analysis results. Ground vibration test is performed for KF stands on its landing gears. For robust aeroelastic analysis with extended dynamic pressure range, the plant P of Fig.

4 is replaced by P. (5) (6) The robust flutter margin of the system can be computed by determining the scaling matrix of dynamic pressure, [wij), for which,u(P) = 1 • A simple method to iteratively search the [w~I for,u(P) = 1+&, with accuracy Cited by: 3.

Airplane math modeling methods for active control design." AGARD-CP () Next 10 → Robust Flutter Margin Analysis That Incorporates Flight Data by algorithms were developed in order to monitor the evolution of the aeroelastic modes of an aircraft during flutter flight tests.

Simulated data were required to evaluate and compare. NASTRAN FEM software. The wing flutter with the external stores was simulated at different altitudes.

The result shows that the flutter velocity is sensitive to the flight altitude. [4]Alfonso Pagani, Marco Petrolo “Flutter analysis by refined 1D dynamic stiffness.One advantage to this method is the ability to consider modeling errors in the analysis and generate a worst-case flutter margin.

Another advantage is the ability to incorporate flight data directly into the analysis to ensure the model accounts for poorly modeled properties that are observed on the aircraft.The problems of uncertainty modeling and model validation of aeroelastic system are investigated. The parametric uncertainty is considered to denote the uncertainties in structure, and both parametric form and unmodeled dynamics are used to represent the influences and mechanism of uncertainties in unsteady aerodynamic forces.

The Linear Fractional Transformation representation of the Author: Yun Haiwei, Han Jinglong, Huang Lili.