A NOVEL TECHNIQUE FOR INVERSE IDENTIFICATION OF DISTRIBUTED STIFFNESS FACTOR IN STRUCTURES

✍ Scribed by G.R. LIU; S.C. CHEN

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 160 KB
• Volume: 254
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.2001.4126

✦ Synopsis

A computational inverse technique for identifying sti!ness distribution in structures is proposed in this paper using structural dynamics response in the frequency domain. In the present technique, element sti!ness factors of the "nite element model of a structure are taken to be the parameters, and explicitly expressed in a linear form in the system equation for forward analysis of the harmonic response of the structure. This o!ers great convenience in applying Newton's method to search for the parameters of sti!ness factor inversely, as the Jacobian matrix can be obtained simply by solving sets of linear algebraic equation derived from the system equation. Examples of identifying sti!ness factor distribution which is often related to damage in the elements of the structure are presented to demonstrate the present technique. The advantages of the present technique for inverse parameter identi"cation problem are (1) the number of the parameters can be very large; (2) the identi"cation process is very fast and (3) the accuracy is very high. The e$ciency of the proposed technique is compared with genetic algorithms.