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Saturday, May 9, 2020 | History

2 edition of Excitation and analysis technique for flight flutter tests found in the catalog.

Excitation and analysis technique for flight flutter tests

G. Haidl

Excitation and analysis technique for flight flutter tests

by G. Haidl

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  • 11 Currently reading

Published by Agard in Neuilly sur Seine .
Written in English


Edition Notes

Paper presented at the 47th Structures and Materials Panel Meeting, Florence, Italy, September 1978.

Statementby G. Haidl and M. Steininger.
SeriesReports -- no.672., AGARD-R-672
ContributionsSteininger, M., Advisory Group for Aerospace Research and Development. Structures and Materials Panel. Meeting,
The Physical Object
Pagination1 microfiche
ID Numbers
Open LibraryOL21003274M

Project Overview Goal: Actively Optimize Wing Shape - Transport Aircraft Approach: Use Flexibility to an Advantage, MDAO, active control • Active flutter suppression is a key enabling technology • Critical PAAW program components – Three different vehicles will be developed and flight tested The first will be very similar to Lockheed Martin’s FFAD (X). Avoiding flutter is essential for safe flight Deterioration in prediction capability Need to Improve flutter boundary prediction methods (Numerical computation, wind tunnel test, flight test) Flutter is a self-excited vibration phenomenon which is one of the aeroelastic phenomena and occurs by a mutualFile Size: 2MB.

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): This paper reviews the test techniques developed over the last several decades for flight flutter testing of aircraft. Structural excitation systems, instrumentation systems, digital data preprocessing, and parameter identification algorithms (for frequency and damping estimates from the response data) are described. Flutter Analysis - q Locus From “Flight Dynamics” Model Real, /sec 0 10 Imag, rad/sec 0 10 20 30 40 50 60 70 80 90 Dynamic-Pressure (q) Locus 1st Sym. Torsion 1st Sym. Bending Elastic Short Period Phugoid Flutter 2nd Sym. Bending BFF Vehicle Longitudinal Dynamics Sea Level Two flutter conditions.

No. 7-A. The airplane flutter requirement specified that “no surface shall show any signs of flutter or appreciable vibration in any attitude or condition of flight.” In , Bulletin No. 7-A was revised in view of service experience and contained advice and good practice techniques for the early airplane designer regarding flutter preventionFile Size: KB. Results & Outlook Summary • Chart 25 > FLINOVIA II > Alexander Klabes > April , • Unique data base of in-flight measured TBL excitation in cruise flight conditions • CFD calculations with TAU for A in cruise flight conditions (similar to flight tests) • Semi-empirical auto-spectrum model adapted to measurements and based on CFD data, by including.


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Excitation and analysis technique for flight flutter tests by G. Haidl Download PDF EPUB FB2

Tests in Early test engineers were faced with inadequate instru-mentation, excitation Excitation and analysis technique for flight flutter tests book, and stability determination techniques. Since then, considerable improvements have been made in flight flutter test technique, instrumentation, and response data analysis.

Flutter testing, however, is still a hazardous test for several Size: KB. being developed in the United Kilngdon for flight vibration testing and flight flutter testing aircraft.

This includes a description of the instnznentation used for recotiing the Vibratioml response, and a comparative assessment of the vaious methods used for exciting the aircraft in i'lipht flutter Size: 2MB.

excitation of flight flutter test is valid and feasible in engineering. Finally, comments regarding the direction of future research are presented in response simulation technique with flight flutter test excitation.

1 Introduction. Modern high-performance civil File Size: KB. excitation technique was developed for use in low- speed wind tunnel tests, and a random excitation tech- nique was developed for flight flutter testing after earlier investigations in a high-speed wind tunnel.

This random excitation method, as will be shown later, is a technique involving spectral analysis ofFile Size: 1MB.

pleted flight tests of an experimental soft-in-plane rotor are used to illus- trate the technique. This technique will also be used for flight flutter tests of the NASA/Army XV Tilt Rotor Research Aircraft, to investigate its propeller whirl flutter stability characteristics, and this application is also discussed Size: KB.

A Historical Overview of Flight Flutter Testing The United States attempted this technique in the 's with flutter tests of a Martin XPBM-I flying boat and a In-flight analysis was.

Part I. A Description of the Excitation and Recording Equipment used for Flight Flutter Tests on a Meteor 8 By P. LUSCOMBE,S. Part II. Comparative Flight Flutter Tests using the 'Decaying Oscillation' and 'Amplitude Response' Techniques By W.

T KIRKBY and P. LUSCOMBE. In particular, the flight tests may be expected to provide some check on the validity of the aerodynamic derivatives used in the calculations and the number of important d e g r e e s of freedom involved in a particular flight mode. GENERAL TECHNIQUES OF FLIGHT FLUTTER TESTING number and the amplitude-speed curves in the significant modes Author: A.J.

Marx. The second part of the paper deals with the digital analysis of flight flutter test data. Recommendations for selection of analysis parameters and how to avoid errors due to digital processing are Author: Mario Marchitti. Flight flutter test technique research was conducted on the F/A HARV to Overview of Recent Flight Flutter Testing Research at NASA Dryden Martin J.

Brenner, Richard C. Lind, and David F. Voracek Overview of Recent Flight Flutter Testing Research at NASA Dryden. To improve the flight flutter test safety and schedule, the flight flutter testing and response simulation for different kinds of excitation techniques is needed to study.

This recording includes a demonstration of Aerodynamic Flutter, a static aeroelastic analysis, and the benefits of Aeroelastic tailoring. Advanced Aeroelastics for Full Aircraft.

This webinar demonstrates Static Aeroelastic Trim Analysis and Flutter Analysis. Flutter, and aeroelasticity in general, is a topic that is often misunderstood or.

Flight Testing, Volume II: Stability and Control focuses on the development of adequate flight test techniques for the appraisal of stability and control characteristics and flying qualities of airplanes. This book discusses the flying quality requirements, longitudinal motions, and flight determination of stick-fixed neutral points.

modified flutter analysis flow using the DMAP program. Fig 2. Modified procedure for MSC Flutter analysis Verification of the developed program The procedure presented above was used to import the tabulated data from reference [4] into NASTRAN and perform the flutter analysis.

It is noted that here the tabulated data is. A new method, based on singular value decomposition and QR factorization, has been developed and applied to the analysis of F flutter flight test data.

The method is capable of identifying the f Author: José Barros-Rodríguez, Roberto Flores Le Roux, Jesús López-Díez, Rodrigo Martinez-Val. Flutter is an oscillation caused by interaction of aerodynamic forces, structural elasticity and inertial effects. Perhaps the best known example of flutter is the bridge over the Tacoma Narrows ('Gallopin' Gertie') that collapsed due to flutter in gale force winds.

Flutter in aircraft causes the wings and / or stabilizers to oscillate. The idea to combine experimental and operational vibration data emerged from flight flutter testing. In those tests [1], the aircraft’s structure is excited by an applied force and by the atmospheric turbulence.

Another typical example is the modal analysis of bridges: the structure is excited by ambient forces (wind, traffic) and by applied. Van Zyl LH () A new concept for a flight flutter excitation system international forum of aeroelasticity and structural dynamics IFASDMadrid Google Scholar 8.

Cooper JE Parameter estimation methods for flight flutter testing AGARD conference proceedingsPa Rotterdam, The Netherlands, 8–10, May Google ScholarCited by: 1. Flight Technique Analysis for Professional Pilots was originally written in by Professor Les Kumpula at Embry-Riddle Aeronautical University, during the development of the first course in flight technique analysis.

New content and updates were added to the book in Why ‘Flutter’ Is a 4-Letter Word for Pilots The aviation world has been all aflutter about Boeing completing a critical part of the Dreamliner testing program — the all-important flutter.

10 basic questions about Theory of Flight. 1. Lift 2. Weight 3. Thrust ; 1. Weight 2. Lift 3. Wind ; 1.The Flutter Exciter system provides dynamic force input to stimulate structural vibration modes of an aircraft in flight, and through all its flying conditions.

This innovative product generates programmed sinusoi dal forces at controllable frequencies, amplitudes, phases and sweep durations.Flight testing is a branch of aeronautical engineering that develops and gathers data during flight of an aircraft, or atmospheric testing of launch vehicles and reusable spacecraft, and then analyzes the data to evaluate the aerodynamic flight characteristics of the vehicle in order to validate the design, including safety aspects.

The flight test phase accomplishes two major tasks: 1.