Date of Award

Spring 1992

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical & Aerospace Engineering

Program/Concentration

Engineering Mechanics

Committee Director

Gene W. Hou

Committee Member

Duc Nguyen

Committee Member

Thomas Alberts

Call Number for Print

Special Collections; LD4331.E57G46

Abstract

A model updating technique is developed with the intent of providing an efficient means of improving the accuracy of the modelling of the vibrational qualities of a large, flexible structure as it undergoes an integrated controls-structures design optimization. The proposed technique utilizes eigenvalue/eigenvector sensitivity information, two different model reduction methods which assign weights of importance to the vibrational modes of the structure, and modal switching based upon the modal weights determined by the model reduction methods. Issues associated with the numerical implementation of the proposed technique, such as discontinuities induced by modal switching, are also addressed.

The proposed model updating technique is applied to a numerical model of a laboratory structure at NASA Langley Research Center which is used to represent a large, flexible space structure. The application of model updating within a controls-structures integrated design optimization environment is shown to result in an improvement in the accuracy of the modelling of the vibrational characteristics of the structure, and for this particular problem, results in a lighter, more stable structure.

Rights

In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).

DOI

10.25777/8gt9-k696

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