Flight test of a decoupler pylon for wing/store flutter suppression

Cover of: Flight test of a decoupler pylon for wing/store flutter suppression |

Published by National Aeronautics and Space Administration, Langley Research Center, For sale by the National Technical Information Service in Hampton, Va, [Springfield, Va .

Written in English

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Subjects:

  • Flutter (Aerodynamics),
  • F-16 (Jet fighter plane)

Edition Notes

Book details

StatementF.W. Cazier, Jr., and M.W. Kehoe.
SeriesNASA technical memorandum -- 87767.
ContributionsKehoe, M. W., Langley Research Center.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL15346844M

Download Flight test of a decoupler pylon for wing/store flutter suppression

Ational flight envelope of tile aircraft, tllus reducing the operational and nission capabil i­ ties of the airplane. Conventional passive means that have been used previ ous1y for rai si ng the flutter speed include changing tile stiffness of tile,Ii n9 or the store pylon, addi ng mass.

Get this from a library. Flight test of a decoupler pylon for wing/store flutter suppression. [F W Cazier; M W Kehoe; Langley Research Center.]. The decoupler Flight test of a decoupler pylon for wing/store flutter suppression book is a NASA concept of passive wing-store flutter suppression achieved by providing a low store-pylon pitch frequency.

Flight tests where performed on an F airplane carrying on each wing an AIM-9J wingtip missile, a GBU-8 bomb near midspan, and an external fuel : Jr. Cazier and M. Kehoe. The airplane was then flown with GBU-8 mounted on the decoupler pylon. The decoupler pylon is a NASA concept of passive wing-store flutter suppression achieved by providing a low store-pylon pitch frequency.

The decoupler pylon successfully suppressed wing-store flutter throughout the flight envelope. A 37 percent increase in flutter velocity over the standard pylon was : M. Kehoe and Jr. Cazier. COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.

3rd Flight Testing Conference and Technical Display August F/AE/F weapons separation wind tunnel to flight test trajectory and clearance comparisons William Plath.

Experimental study of pylon geometries for transport aircraft. DINESH NAIK, ANTHONY INGRALDI and ODIS PENDERGRAFT, JR. Design and flight test of active flutter suppression on the XA multi-utility technology test-bed aircraft - Volume Issue - E.

Burnett, J. Beranek, B. The decoupler pylon successfully suppressed wing-store flutter throughout the flight envelope. A 37 percent increase in flutter velocity over the standard pylon was demonstrated.

Maneuvers with. the GBU-8 mounted on the decoupler pylon. The decoupler pylon is a NASA concept of passive wing-store flutter suppression achieved by providing a low store-pylon pitch frequency. The decoupler pylon successfully suppressed wing-store flutter throughout the flight. The airplane was then flown with GBU-8 mounted on the decoupler pylon.

The decoupler pylon is a NASA concept of passive wing-store flutter suppression achieved by providing a low store-pylon pitch frequency. The decoupler pylon successfully suppressed wing-store flutter throughout the flight envelope.

A 37 percent increase in flutter velocity over the standard pylon was demonstrated. The aeroelastic characteristics of the slender wing with store have been studied for several years.

However, the nonlinear aeroelastic behaviors of the wing-store system have not. The decoupler pylon is a NASA concept of passive wing-store flutter suppression achieved by providing a low store-pylon pitch frequency.

Flight tests where performed on an F. The decoupler pylon described herein alleviates wing-store flutter using elements of both active and passive suppression. Bending and torsion mode frequencies are separated by the arrangement, thus increasing flutter speed without performance penalties.

Active flutter suppression of a lifting surface using piezoelectric actuation and modern control theory. model has been used as an active control test bed for evaluating new and innovative control proposed an active decoupler pylon for the improvement of the stability robustness of an active wing/store flutter suppression system.

Flutter Suppression of a Flexible Flying-Wing UAV Using the Leading Edge Stagnation Point Sensor A THESIS SUBMITTED TO THE FACULTY OF THE GRADUATE SCHOOL OF THE UNIVERSITY OF MINNESOTA BY Adri a Serra Moral IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE Peter Seiler, Advisor September, The analyses show that the Decoupler Pylon will suppress wing-store flutter for the GBU-8 flight test stores configuration on an F airplane.

The feasibility of carrying a B on the pylons is also investigated with the conclusion that the pylons would need to be modified in order to demonstrate flutter suppression. in the cmse of a wing the pich~~s are deployed cEaord\tise in spanwise pairs, each pair comprising one trnnsduccr on the main and one on the Ear spar.

* By Flight Vibratiou Testing is zxnt the me~~suro,nent of the vibration frequencies of an aircraft and their ~ssociatod mo&s in flight >+iithout. 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.

The problem of linear flutter analysis in the presence of structural uncertainty is addressed. Whereas the propagation of uncertain structural parameters in finite element models has been carried o.

suppression (OAMS) system designed to dampen out a structural vibration in the wing. 23 Mar FAA and Boeing agree on -8 OAMS special condition. The XA Multi-utility Aeroelastic Demonstration (MAD) is an innovative modular unmanned air vehicle designed to test active flutter suppression and gust load alleviation.

A Historical Overview of Flight Flutter Testing. SUMMARY the many store configurations that an airplane can carry. AT-8 flight test Wright Field, Nov. Left wing data Right wing data x x x x x x.

3 In the late ’s, excitation systems consisted of iner. 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).

In fact, predicted flutter must be at least of Vd. The way they predict flutter is mathematical up to a point, after which it is by plotting actual test results on a graph with gradual airspeed increments. Out of interest, the modelling analysis for the Ravin predicted that it would be free from flutter.

The flight tests were performed using a F as a host carrier for an aerostructure test wing (ATW). This ATW is not a complete aircraft, but it is a realistic wing and the envelope could be expanded during the flight tests to a point at which its flutter speed would be achieved.

Flutter analysis ensures the aircraft is safe and free from flutter at all points in the flight envelope. Flight flutter tests must be performed to demonstrate the accuracy of. Decoupler pylon: wing/store flutter suppressor: Reed: / An on-line method for robust flutter prediction in expanding a safe flight envelope for an aircraft to define an envelope of safe flight conditions, comprising two parts, a first part comprising the steps of "F Flight Flutter Test Program," Flutter Testing.

A pulse test is perhaps the simplest form of flutter testing and simply consists of a pilot abruptly moving the controls — a deliberate smack forward of the yoke, for example. Engineers on the ground observe how the abrupt motion introduced to the flight surface is damped over time.

location of the engine on the flutter speed. The pylon stiffness was then varied to alter the side-bending frequency, yawing frequency, and pitching frequency of the engine-pylon mode. The effects on the flutter characteristics of the over-the-wing engine mount. Shop for DIY Airplanes at Flite Test.

We ask for your understanding as you may experience delivery delays. An F from the 40th Flight Test Squadron located at Eglin Air Force Base, FL returns to base after completing testing on 23 August Flutter testing evaluates the vibration characteristics of the airplane at certain speeds to asses the impact of plane lifetime and safe mission accomplishment.

Airplane wing deformation is an important element of aerodynamic characteristics, structure design, and fatigue analysis for aircraft manufacturing, as well as a main test content of certification regarding flutter for airplanes. This paper presents a novel real-time detection method for wing deformation and flight flutter detection by using three-dimensional speckle image correlation technology.

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. Aerospace Dynamics Homework Analysis of wing flutter based on varying heaving and pitching stiffness.

Fortran flow computation courtesy of. B-2 Flight Test - Northrop Grumman B-2 Chief Test Pilot Don Weiss and Aerospace Systems Sector Chief Test Pilot Troy Johnson present an overview of 25 Years of Flight Test on the B-2 Stealth Bomber. [] low level footage wait till [] "B-2 can't fly in rain" ehEDIT: note the verbal countdown.

This flutter. Flutter Flight Tests. more modern finite-state thin-airfoil theory of Peters et al. Application of the assumed- modes method to construct a flutter analysis of a flexible wing was demonstrated as well. The important parameters of the flutter problem were discussed, along with current design practice, flight testing, and certification.

On its AFRL lead mission the ft.-span vehicle will test active flutter suppression and gust load alleviation. Following that phase the XA will be transferred to NASA, to support NASA Dryden Flight Research Center, to assist the research of lightweight structures and advanced technology for future low-emissions transport aircraft.

How To Calculate Fin Flutter Speed als, add an additional safety factor. From Equation 1, the variables under the square root describing the geometry of the wing are the thickness of the wing (t), root chord (c), Aspect Ratio (AR) and the Taper Ratio (l).

The equations for these variables are listed below. Mocking a design from dribbble in Flutter Design: Flight Tickets Deal Tracker App | Day / - Project - Wing Flutter on a A Boeing model undergoes flutter testing in a wind tunnel, circa The purpose of the test was to determine the effects (primarily the aerodynamics) of the large cowls surrounding the engine fans on the flutter characteristics of the aircraft.

(). A slogan for Dynamic Engineering Inc. (DEI) is "mobilizing minds and materials in research and development for land, sea, air, and space." That blend of talent and technology came together in to establish DEI of Newport News, Virginia.

The core of early work by the company was building aircraft. The First Jet Pilot – the story of German test pilot Erich Warsitz, by Lutz Warsitz (his son) Pen & Sword ISBN This book tells the extraordinary story of how the world’s first rocket and jet-propelled aircraft were built and flown, just before the second world war.A professor from Kansas recommended stiffening of the tail spar and was so convinced that this would cure the flutter that he joined the next test flight, only to crash with the aircraft.

As it turned out, the stiffening shifted the flutter speed up such that the forces involved broke the spar while flutter was non-destructive with the softer.

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