Accession Number : AD0769856

Title :   Eigenvalue Analysis of Large, Complex Structures by the Static Condensation Technique.

Descriptive Note : Technical note,

Corporate Author : MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Personal Author(s) : Britten,Stephen S.

Report Date : 19 SEP 1973

Pagination or Media Count : 27

Abstract : FREEDOM, Equations of motion, Condensation, Graphics, Computer programmingFinite element analysis, *Static structural analysis, Computer graphicsThe static condensation technique, as applied to the eigenvalue analysis of large complex structures, is evaluated using ICES/STRUDL. Accuracy is verified by two simple test problems. A real-life problem of considerable magnitude delineates the technique's merits as problem size varies. Backtransformation of results to condensed degrees of freedom is shown to be expensive if not really needed (i.e., if member forces are not required). Also shown essential for large, complex structures are: good banding algorithm, exhibiting reductions in solution time, lumped-mass approach to provide comparable accuracy at less cost over the consistent-mass approach, and graphics package to process input data and present output graphically. (Author)

Descriptors :   (*STRUCTURES, STRUCTURAL PROPERTIES), EIGENVECTORS, DEGREES OF FREEDOM, EQUATIONS OF MOTION, CONDENSATION, GRAPHICS, COMPUTER PROGRAMMING

Subject Categories : Structural Engineering and Building Technology
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE