Automated dynamic analytical model improvement
Alex Berman, Fu Shang Wei, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch, Langley Research Center
National Aeronatucs and Space Administration, Scientific and Technical Information Branch, 1981 - Computers - 44 pages
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50 largest changes AIAA algorithm analysis Analytical Model Improvement Arbitrary changed column combinations of modes computed full modes decomposition degrees of freedom Description Mass matrix diagonal elements diagonal matrix dynamic analytical models ERROR ON IMPROVED frequencies and mode frequency dependent terms frequency terms 50 FULL MODE COMPUTATION full mode shapes Guyan IMPROVED MODEL Kaman Aerospace Corporation l097 degree Lagrangian multiplier Langley Research Center Largest Changes Row lower triangular matrix LU decomposition mass and stiffness Mass matrix changes measured mode shapes measured natural frequencies minimum changes modal displacements Modal Test MODE SHAPE ERROR model d.o.f. NASA NASTRAN natural fre NMMAX normal mode number of degrees number of modes Orig Delta Ratio ORTHOGONALITY CHECK MATRIX predict the measured reduced model Row Col Orig shapes and frequencies significant figure simultaneous equations solve Stiffness matrix changes Structural Dynamics System Identification Table XI terms 50 Largest test degrees tical tion