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Derivatives of a statically reduced stiffness matrix with respect to sizing variablesAn expression is obtained for the first derivatives with respect to the sizing variables of a statically reduced stiffness matrix that is a nonlinear function of the sizing variables, where the unreduced stiffness matrix is a linear function of the sizing variables. An accepted procedure to reduce the number of degrees of freedom is to eliminate a number of nodal displacements from the degrees of freedom such that the accuracy of the flutter analysis is not significantly affected. In a typical optimization procedure with flutter constraints, the derivative of the stiffness matrix may be used in a form that contains the characteristic vector of the flutter matrix equation and the transpose of the characteristic vector of the adjoint flutter matrix equation corresponding to a particular solution of the flutter equation.
Document ID
19760045638
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Oconnell, R. F.
(Lockheed-California Co. Burbank, CA, United States)
Hassig, H. J.
(Lockheed-California Co. Burbank, CA, United States)
Radovcich, N. A.
(Lockheed-California Co. Burbank, Calif., United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1976
Publication Information
Publication: Journal of Aircraft
Volume: 13
Subject Category
Structural Mechanics
Accession Number
76A28604
Funding Number(s)
CONTRACT_GRANT: NAS1-12121
Distribution Limits
Public
Copyright
Other

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