Análisis Modal Operacional mediante Georadar IBIS
Fecha
2017-07
Autores
Piñeiro Reyes, Liz Claudia
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Editor
Universidad Central ¨Marta Abreu¨ de Las Villas. Facultad de Construcciones. Departamento de Ingeniería Civil.
Resumen
Se presentan las bases teóricas del Análisis Modal, tanto del Análisis Modal Experimental (EMA) como del Análisis Modal Operacional (OMA). Se desarrollan los conceptos relacionados con modelos: tipos, métodos de obtención, etc. Se describen algunos de los modelos empleados para la caracterización de estructuras vibrantes como el Modelo de Elementos Finitos, Modelos Estado-Espacio, Modelos ARMA y Modelos (continuos y discretos) en el dominio de la frecuencia. Se muestran las principales características del Georadar IBIS para la realización de un Análisis Modal Operacional y se ofrece una metodología para el empleo de su software de obtención de la señal.
Se presentan los métodos paramétricos y no paramétricos para identificar los sistemas estructurales. Se hace énfasis en los no paramétricos como el Peak Picking y el FDD pues son en los que se basa el software asociado al Georadar IBIS para la identificación de sistemas estocásticos. Se define una guía para el empleo de dicho software.
Se aplican las bases teóricas del Análisis Modal Operacional a un caso de estudio mediante el Georadar IBIS para la identificación de las frecuencias propias, coordenadas modales y el amortiguamiento de una estructura tipo puente donde se complementa el análisis con el «toolbox» de MatLab: MACEC
The theoretical bases of the Modal Analysis, both of the Experimental Modal Analysis (EMA) and the Operational Modal Analysis (AOM), are presented. The concepts related to models are developed: types, methods of obtaining, etc. We describe some of the models used for the characterization of vibrating structures such as the Finite Element Model, State-Space Models, ARMA Models and Models (continuous and discrete) in the frequency domain. It shows the main features of the Georadar IBIS for conducting an Operational Modal Analysis and offers a methodology for the use of its software to obtain the signal. Parametric and non-parametric methods are presented to identify structural systems. Emphasis is placed on nonparametric ones such as Peak Picking and FDD as they are the basis for the software associated with the Georadar IBIS for the identification of stochastic systems. A guide is defined for the use of such software. The theoretical bases of the Operational Modal Analysis are applied to a case study by the Georadar IBIS for the identification of the own frequencies, modal coordinates and the damping of a bridge type structure where the analysis is complemented with the MatLab toolbox: MACEC.
The theoretical bases of the Modal Analysis, both of the Experimental Modal Analysis (EMA) and the Operational Modal Analysis (AOM), are presented. The concepts related to models are developed: types, methods of obtaining, etc. We describe some of the models used for the characterization of vibrating structures such as the Finite Element Model, State-Space Models, ARMA Models and Models (continuous and discrete) in the frequency domain. It shows the main features of the Georadar IBIS for conducting an Operational Modal Analysis and offers a methodology for the use of its software to obtain the signal. Parametric and non-parametric methods are presented to identify structural systems. Emphasis is placed on nonparametric ones such as Peak Picking and FDD as they are the basis for the software associated with the Georadar IBIS for the identification of stochastic systems. A guide is defined for the use of such software. The theoretical bases of the Operational Modal Analysis are applied to a case study by the Georadar IBIS for the identification of the own frequencies, modal coordinates and the damping of a bridge type structure where the analysis is complemented with the MatLab toolbox: MACEC.
Descripción
Palabras clave
Análisis Modal Operacional, Análisis Modal Experimental, Modelo Elementos Finitos, Modelo Estado Espacio, Georadar IBIS