Identification of parametric finite-element models using experimental modal data

A general parametric form of a dynamic finite-element model of a linear elastic structure with small deformations is presented, with the model consisting of a set of scalar parameters multiplying element kernel matrices. The parameters of the finite-element model can represent stiffness and inertia properties, as well as axial forces if linearized buckling is assumed. Optimization of an orthogonality-based objective functional is employed to estimate parameters, using nondestructively measured experimental eigenpair data, allowing for the finite dimensional, unnormalized, sparse, truncated, and inaccurate natures of experimental modal data. The method enables the use of incomplete eigenvectors, i.e., modes shapes with sparsely measured displacements. Although not vital to the parameter identification method, a procedure for combining modal data from numerous separate experiments is discussed, with the purpose of improving accuracy of the parameters.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Mechanical Science and Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2011

Author dc:creator

• Alcoe, D.J.

Contributors dc:contributor

• Miller, Robert E.

• Applied Mechanics
• Engineering, Aerospace
• Engineering, Mechanical

Statement dc:rights

• Copyright 1992 Alcoe, David James

Language dc:language

eng

Identifier

AAI9215763
(UMI)AAI9215763

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/19895