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Effect of a flexibly mounted store on the flutter speed of a wingA passive system proposed for increasing the flutter speed of a wing with heavy concentrated weights involves the concept of mounting the store on a pitch pivot having a very low pitch stiffness relative to the wing stiffness. This concept was investigated utilizing a two dimensional approach involving 4 degrees of freedom, namely, wing bending, wing torsion, store pitch and store vertical translation. This preliminary analysis was very encouraging and the results demonstrate that, if the uncoupled store pitch frequency was below the wing bending frequency, the flutter speed was greatly increased. A second more complete analysis was developed utilizing a three dimensional structure, but retaining the two dimensional, incompressible unsteady airforces of Theodorsen. The details of the analysis are included.
Document ID
19800013869
Document Type
Contractor Report (CR)
Authors
Runyan, H. L.
(Joint Inst. for Advancement of Flight Sciences Hampton, VA, United States)
Date Acquired
September 4, 2013
Publication Date
April 1, 1980
Subject Category
Aircraft Stability And Control
Report/Patent Number
NASA-CR-159245
Funding Number(s)
CONTRACT_GRANT: NSG-1438
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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