Modal Test/Analysis Correlation of Space Station Structures Using Nonlinear SensitivityThe modal correlation problem is formulated as a constrained optimization problem for validation of finite element models (FEM's). For large-scale structural applications, a pragmatic procedure for substructuring, model verification, and system integration is described to achieve effective modal correlation. The space station substructure FEM's are reduced using Lanczos vectors and integrated into a system FEM using Craig-Bampton component modal synthesis. The optimization code is interfaced with MSC/NASTRAN to solve the problem of modal test/analysis correlation; that is, the problem of validating FEM's for launch and on-orbit coupled loads analysis against experimentally observed frequencies and mode shapes. An iterative perturbation algorithm is derived and implemented to update nonlinear sensitivity (derivatives of eigenvalues and eigenvectors) during optimizer iterations, which reduced the number of finite element analyses.
Document ID
19920024977
Acquisition Source
Headquarters
Document Type
Conference Paper
Authors
Gupta, Viney K. (Rockwell International Corp. Canoga Park, CA, United States)
Newell, James F. (Rockwell International Corp. Canoga Park, CA, United States)
Berke, Laszlo (NASA Lewis Research Center Cleveland, OH, United States)
Armand, Sasan (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 6, 2013
Publication Date
September 1, 1992
Subject Category
Structural Mechanics
Report/Patent Number
NAS 1.15:105850E-7297NASA-TM-105850
Meeting Information
Meeting: Symposium on Multidisciplinary Analysis and Optimization