Vibration of lightweight composite structures with random irregularities

Date
2009-07-16
Authors
Chung, H
Supervisor
Item type
Degree name
Journal Title
Journal ISSN
Volume Title
Publisher
University of Otago
Abstract

Exact determination of the vibration of a composite structure becomes impossible beyond the low-frequency range due to uncertainties in the structure. Therefore, the prediction model in the mid- to high-frequency range must include the effects of the irregularities. I will show how the power spectral density of an irregularity in a component can be included in the model. A lightweight floor/ceiling system is used as an example. Effects of twisting joists or varying stiffness of the floor show up as a simple summation in the original forward operator. Understanding random irregularities in composite structures have become important, because any manufacturing process introduces randomness, and traditional modelling techniques such as the finite element method or statistical energy analysis have not been very successful.

Description
Keywords
Source
Presentation at the Departmental seminar of the Mathematics and Statistics Department, University of Otago, Dunedin, New Zealand
DOI
Rights statement
NOTICE: this is the author’s version of a work that was accepted for publication. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in (see Citation). The original publication is available at (see Publisher's Version)