Feroz Ahmed

Abstract

This thesis presents a general method to modify the properties of a finite element model of a structure to better correlate analytical (FE) modal data with experimental modal data. A FORTRAN program to correlate finite element and experimental results of a structure by executing a Cross-Orthogonality check was developed. Sensitivity coefficients of a structure were generated to tune the FE model to match the experimental model. These sensitivity coefficients were generated through sensitivity analysis which illustrates the change in response of a structure for known changes in parameters. This thesis covers the theory, procedure, and application of sensitivity analysis. Sensitivity coefficients were generated through MSC/NASTRAN (SOL 63 and SOL 53) and the coefficients were used to tune a finite element model. A method that employs nonlinear coefficients developed by Wada and Kuo was also used to increase the rate of convergence. The application of Wada and Kuo method was simplified and the calculations needed to obtain nonlinear coefficients were significantly reduced. The rate of convergence of linear coefficient model tuning is compared with the rate of convergence of nonlinear coefficient model tuning.

Library of Congress Subject Headings

Structural analysis (Engineering)--Matrix methods; Engineering models--Data processing; Modal analysis; Finite element method

Publication Date

1995

Document Type

Thesis

Student Type

- Please Select One -

Department, Program, or Center

Mechanical Engineering (KGCOE)

Advisor

Budynas, Richard

Advisor/Committee Member

Kempski, Mark

Advisor/Committee Member

Kocherberger, K.

Comments

Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works. Physical copy available through RIT's The Wallace Library at: TA642 .A45 1995

Campus

RIT – Main Campus

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