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Analytical And Experimental Study Of Monitoring For Chain-Like Nonlinear Dynamic Systems
Title
Analytical And Experimental Study Of Monitoring For Chain-Like Nonlinear Dynamic Systems.
Creator
Paul, Bryan, Yun, Hae-Bum, Catbas, Fikret, Chopra, Manoj, University of Central Florida
Abstract / Description
Inverse analysis of nonlinear dynamic systems is an important area of research in the ?eld of structural health monitoring for civil engineering structures. Structural damage usually involves localized nonlinear behaviors of dynamic systems that evolve into different classes of nonlinearity as well as change system parameter values. Numerous parametric modal analysis techniques (e.g., eigensystem realization algorithm and subspace identification method) have been developed for system...
Show moreInverse analysis of nonlinear dynamic systems is an important area of research in the ?eld of structural health monitoring for civil engineering structures. Structural damage usually involves localized nonlinear behaviors of dynamic systems that evolve into different classes of nonlinearity as well as change system parameter values. Numerous parametric modal analysis techniques (e.g., eigensystem realization algorithm and subspace identification method) have been developed for system identification of multi-degree-of-freedom dynamic systems. However, those methods are usually limited to linear systems and known for poor sensitivity to localized damage. On the other hand, non-parametric identification methods (e.g., artificial neural networks) are advantageous to identify time-varying nonlinear systems due to unpredictable damage. However, physical interpretation of non-parametric identification results is not as straightforward as those of the parametric methods. In this study, the Multidegree-of-Freedom Restoring Force Method (MRFM) is employed as a semi-parametric nonlinear identification method to take the advantages of both the parametric and non-parametric identification methods.The MRFM is validated using two realistic experimental nonlinear dynamic tests: (i) large-scale shake table tests using building models with different foundation types, and (ii) impact test using wind blades. The large-scale shake table test was conducted at Tongji University using 1:10 scale 12-story reinforced concrete building models tested on three different foundations, including pile, box and fixed foundation. The nonlinear dynamic signatures of the building models collected from the shake table tests were processed using MRFM (i) to investigate the effects of foundation types on nonlinear behavior of the superstructure and (ii) to detect localized damage during the shake table tests. Secondly, the MRFM was applied to investigate the applicability of this method to wind turbine blades. Results are promising, showing a high level of nonlinearity of the system and how the MRFM can be applied to wind-turbine blades. Future studies were planned for the comparison of physical characteristic of this blade with blades created made of other material.
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Date Issued
2013
Identifier
CFE0004734, ucf:49818
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFE0004734
THE REPRESENTATION OF POVERTY IN GREAT DEPRESSIONAMERICAN LITERATURE
Title
THE REPRESENTATION OF POVERTY IN GREAT DEPRESSIONAMERICAN LITERATURE.
Creator
Austin, Cavel, Olan, Elsie, University of Central Florida
Abstract / Description
The objective of this thesis is to explore how American authors represented poverty across different states during the Depression Era. I have chosen to review social reform author John Steinbeck, and proletariat authors, Michael Gold, Meridel Le Sueur, and William Attaway. Before addressing the issues presented in the data collection tools (novels): The Grapes of Wrath, Jews Without Money, The Girl, and Blood on the Forge, I reviewed the fundamentals of the events leading up to the crash of...
Show moreThe objective of this thesis is to explore how American authors represented poverty across different states during the Depression Era. I have chosen to review social reform author John Steinbeck, and proletariat authors, Michael Gold, Meridel Le Sueur, and William Attaway. Before addressing the issues presented in the data collection tools (novels): The Grapes of Wrath, Jews Without Money, The Girl, and Blood on the Forge, I reviewed the fundamentals of the events leading up to the crash of the stock market, which spiraled the United States and the world at large in the greatest Depression ever known. In this thesis, I have also outlined a summary of the novels for the benefit of readers who may not have had the opportunity to read them. I have applied a Marxist literary critical analysis to the preceding novels highlighting three overarching concepts of the theory: economic power, materialism versus spirituality, and class conflict. Evolving from these concepts are the key tenets of Marxism: base, superstructure, hegemony, commodification, class conflict, and false consciousness. In the literary critical analysis, I applied these key tenets to the plot of each novel in order to underscore the ideologies of Marxist theorists with regards to the existence of class divisions and how this division creates class conflict between the bourgeoisie and the proletariats.
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Date Issued
2014
Identifier
CFH0004708, ucf:45397
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFH0004708