An Exploratory Investigation of Some Types of Aeroelastic Instability of Open and Closed Bodies of Revolution Mounted on Slender Struts

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Aeroelastic instability phenomena of isolated open and closed rigid bodies of revolution free to move under elastic restraint have been investigated experimentally at low speeds by means of models suspended at zero angles of attack and yaw on slender flexible struts from a wind tunnel ceiling. Three types of instability were observed - flutter similar to classical bending-torsion flutter, divergence, and an uncoupled oscillatory instability which consists in nonviolent continuous or intermittent small-amplitude oscillations involving only angular deformations. The speeds at which this oscillatory instability starts were found to be as low as about one-third of the speed at flutter ... continued below

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Clevenson, S. A.; Wildmayer, E., Jr. & Diederich, Franklin W. June 30, 1953.

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  • Main Title: An Exploratory Investigation of Some Types of Aeroelastic Instability of Open and Closed Bodies of Revolution Mounted on Slender Struts
  • Series Title: NACA Research Memorandums

Description

Aeroelastic instability phenomena of isolated open and closed rigid
bodies of revolution free to move under elastic restraint have been
investigated experimentally at low speeds by means of models suspended
at zero angles of attack and yaw on slender flexible struts from a wind tunnel
ceiling. Three types of instability were observed - flutter similar
to classical bending-torsion flutter, divergence, and an uncoupled
oscillatory instability which consists in nonviolent continuous or intermittent
small-amplitude oscillations involving only angular deformations.
The speeds at which this oscillatory instability starts were found to be
as low as about one-third of the speed at flutter or divergence and to
depend on the shape of the body, particularly that of the afterbody, and
on the relative location of the elastic axis.
An attempt has been made to calculate the airspeeds and, in the
case of the oscillatory phenomena, the frequencies at which these instabilities occur by using slender-body theory for the aerodynamic forces
on the bodies and neglecting the aerodynamic forces on the struts. However,
the agreement between the speeds and frequencies calculated in this
manner and those actually observed has been found to be generally unsatisfactory;
with the exception of the frequencies of the uncoupled oscillations
which could be predicted with fair accuracy. The nature of the
observed phenomena and of the forces on bodies of revolution suggests
that a significant improvement in the accuracy of analytical predictions
of these aeroelastic instabilities can be had only by taking into account
the effects of boundary-layer separation on the aerodynamic forces.

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  • URL: http://hdl.handle.net/2060/20090014039 External Link
  • Report No.: NACA-RM-L53E07
  • Center for AeroSpace Information Number: 20090014039
  • Archival Resource Key: ark:/67531/metadc65014

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National Advisory Committee for Aeronautics Collection

The National Advisory Committee for Aeronautics (NACA) was a U.S. federal agency founded on March 3, 1915 to undertake, promote, and institutionalize aeronautical research. On October 1, 1958 the agency was dissolved, and its assets and personnel transferred to the newly created National Aeronautics and Space Administration (NASA).

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This selection of materials from the Technical Report Archive and Image Library (TRAIL) includes hard-to-find reports published by various government agencies. The technical publications contain reports, images, and technical descriptions of research performed for U.S. government agencies. Topics range from mining, desalination, and radiation to broader physics, biology, and chemistry studies. Some reports include maps, foldouts, blueprints, and other oversize materials.

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Creation Date

  • June 30, 1953

Added to The UNT Digital Library

  • Nov. 17, 2011, 5:13 p.m.

Description Last Updated

  • Jan. 27, 2017, 12:35 p.m.

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Clevenson, S. A.; Wildmayer, E., Jr. & Diederich, Franklin W. An Exploratory Investigation of Some Types of Aeroelastic Instability of Open and Closed Bodies of Revolution Mounted on Slender Struts, report, June 30, 1953; (digital.library.unt.edu/ark:/67531/metadc65014/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.