Accession Number : AD0756802

Title :   Calcul Selectif de L'influence de Grandes Modifications Structurales sur les Modes Propres D'une Structure Lineaire (Selective Computation of the Influence of Large Structural Modifications on the Eigen Modes of a Linear Structure),

Corporate Author : OFFICE NATIONAL D'ETUDES ET DE RECHERCHES AEROSPATIALES CHATILLON-SOUS-BAGNEUX (FRANCE)

Personal Author(s) : Valid,Roger

Report Date : 14 OCT 1971

Pagination or Media Count : 7

Abstract : An algorithm is presented which permits one to follow in a selective way, some eigen modes and the influence of structural modifications, even if these are important. The method is a perturbation step by step technique, ased on linearization of the first or second order, associated with a Schmidt's orthogonalization procedure and with approximate inversions. Some refinements are introduced as the end of the program and the algorithm is extended to cases where frequqncy crossings are encountered. A simple numerical application gives an idea of the precison and of the efficiency of the algorithm. (Author)

Descriptors :   (*VIBRATION, MATHEMATICAL ANALYSIS), ALGORITHMS, MATRICES(MATHEMATICS), NUMERICAL ANALYSIS, FRANCE

Subject Categories : Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE