Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/243067
Type: Artigo de periódico
Title: Modal Analysis Of Structures Under Non-stationary Excitation
Author: Idehara
Sergio Junichi; Dias Junior
Milton
Abstract: The search for mathematical-numerical models to be applied in the design or optimization of civil structures may require adjustment and validation based on experimental data. However, in many cases, when performing dynamic assessment in field structures, it is common to face the situation where it is impossible to stop the running of certain equipment. In this case, all measurements performed on the building and the neighboring structures will be corrupted by noise generated during the operation of these machines. Clearly, many parameter estimation algorithms used to characterize the dynamic behavior of a structure, which are based on the assumption of prior knowledge of the input force in their formulations, may give poor results. In this context, a modal analysis procedure based on the adaptive filter RLS/QRD is described. In this analysis, the measured vibration signal is corrupted by a harmonic noise, in particular, in the presence of signals from the actual machine or other nearby machines. The specific characteristics of the modeling and the hypotheses associated with the harmonic signals are explained. The fact that the excitation force is considered not to be time-invariant in the model, but the frequency varies over time, allows the modal parameters to be identified even under non-stationary conditions. In order to investigate the influence of harmonic noise on the estimated values, a numerical model of the ASCE benchmark structure was used to simulate some practical situations. (C) 2015 Elsevier Ltd. All rights reserved.
Subject: Harmonic Excitations
Random Decrement
Algorithm
Rls
Identification
Domain
Tower
Country: OXFORD
Editor: ELSEVIER SCI LTD
Rights: fechado
Identifier DOI: 10.1016/j.engstruct.2015.04.035
Address: http://www.sciencedirect.com/science/article/pii/S0141029615002916
Date Issue: 2015
Appears in Collections:Unicamp - Artigos e Outros Documentos

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