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Experimental and analytical investigations of a fighter-like wind tunnel model with external stores
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0003-2391-641X
2017 (English)In: 17th International Forum on Aeroelasticity and Structural Dynamics, IFASD 2017, International Forum on Aeroelasticity and Structural Dynamics (IFASD) , 2017Conference paper, Published paper (Refereed)
Abstract [en]

In a recently finished project the ability to design and manufacture advanced wind tunnel models have been addressed as well as the development of tools for analysis of nonlinear aeroelastic phenomena. Experimental static tests of a real aircraft pylon-store test asset indicated a nonlinear behaviour in the sway brace and store interface for low preload cases. This characteristics was then replicated in a model scale with a detailed hardware realisation. A fairly extensive low speed wind tunnel program was performed with different store configurations as well as parameter variations of the sway brace preload and mass properties of the external stores. A failure case with a free-play between the wing tip missile and pylon was also investigated. Small differences were found in flutter speed and amplitude at the neutrally stable condition depending on the preload or introduced free-play. However, when the preload is reduced to half nominal value there was more of a constant amplitude (LCO) behaviour at the critical speed. This could be due to an amplitude dependent structural damping, something which numerically is shown to have a quenching effect. 

Place, publisher, year, edition, pages
International Forum on Aeroelasticity and Structural Dynamics (IFASD) , 2017.
Keywords [en]
Aeroelasticity, Flutter, Limit-cycle oscillation, Wind tunnel testing, Elastic waves, Flutter (aerodynamics), Structural dynamics, Aeroelastic phenomenon, Analytical investigations, Design and manufactures, Limit Cycle Oscillation (LCO), Low-speed wind tunnel, Nonlinear behaviours, Wind tunnel modeling, Wind-tunnel testing, Wind tunnels
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-236829Scopus ID: 2-s2.0-85048578782ISBN: 9788897576280 (print)OAI: oai:DiVA.org:kth-236829DiVA, id: diva2:1273758
Conference
17th International Forum on Aeroelasticity and Structural Dynamics, IFASD 2017, 25 June 2017 through 28 June 2017
Note

QC 20181221

Available from: 2018-12-21 Created: 2018-12-21 Last updated: 2018-12-21Bibliographically approved

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Ringertz, Ulf

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
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More styles
Language
  • de-DE
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  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
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  • text
  • asciidoc
  • rtf