Viscoelastic struts for vibration mitigation of FORTE

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Description

FORTE is a small satellite being developed by Los Alamos National Laboratory (LANL) and Sandia National Laboratories Albuquerque (SNLA). It will be placed into orbit via a Pegasus launch in 1996. Testing a full-scale engineering model of the structure using the proto-qualification, system-level vibration spectrum indicated that acceleration levels caused by structural resonances exceed component levels to which certain sensitive components had previously been qualified. Viscoelastic struts were designed to reduce response levels associated with these resonances by increasing the level of damping in key structural modes of the spacecraft. Four identical shear-lap struts were fabricated ad installed between the ... continued below

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11 p.

Creation Information

Maly, J.R. & Butler, T.A. May 1, 1996.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 22 times . More information about this report can be viewed below.

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  • Maly, J.R. CSA Engineering, Inc., Palo Alto, CA (United States)
  • Butler, T.A. Los Alamos National Lab., NM (United States)

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Description

FORTE is a small satellite being developed by Los Alamos National Laboratory (LANL) and Sandia National Laboratories Albuquerque (SNLA). It will be placed into orbit via a Pegasus launch in 1996. Testing a full-scale engineering model of the structure using the proto-qualification, system-level vibration spectrum indicated that acceleration levels caused by structural resonances exceed component levels to which certain sensitive components had previously been qualified. Viscoelastic struts were designed to reduce response levels associated with these resonances by increasing the level of damping in key structural modes of the spacecraft. Four identical shear-lap struts were fabricated ad installed between the two primary equipment decks. The struts were designed using a system finite element model (FEM) of the spacecraft, a component FEM of the strut, and measured viscoelastic properties. Direct complex stiffness testing was performed to characterize the frequency-dependent behavior of the struts, and these measured properties (shear modulus and loss factor) were used to represent the struts in the spacecraft model. System-level tests were repeated with the struts installed and the response power spectral densities at critical component locations were reduced by as much as 10 dB in the frequency range of interest.

Physical Description

11 p.

Notes

OSTI as DE96009784

Source

  • Society of Photo-Optical Instrumentation Engineers (SPIE) smart structures and materials conference, San Diego, CA (United States), 26-29 Feb 1996

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  • Other: DE96009784
  • Report No.: LA-UR--96-709
  • Report No.: CONF-960268--9
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/226056 | External Link
  • Office of Scientific & Technical Information Report Number: 226056
  • Archival Resource Key: ark:/67531/metadc664472

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • May 1, 1996

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

Description Last Updated

  • Feb. 29, 2016, 12:43 p.m.

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Maly, J.R. & Butler, T.A. Viscoelastic struts for vibration mitigation of FORTE, report, May 1, 1996; New Mexico. (digital.library.unt.edu/ark:/67531/metadc664472/: accessed December 12, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.