A Comparative Study of Structural Dynamic Modification and Sensitivity Method Approximation

Yap, Keng C.; Zimmerman, D. C.

doi:10.1006/mssp.2001.1451

Cited by 13 publications

(4 citation statements)

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“…In Bridge Health Monitoring process, the results of dynamic tests are generally applied for (Figure 2): -identification of loads − assessment of the magnitude as well as the spatial and temporal distribution of forces acting on a structure, [3,5,7,16,22,25] -structural system identification, typically based on dynamic parameters [2,4,6,13,17,25] and focused on structure stiffness, boundary conditions, integrity and so on, -identification of overloading [13,21,25] by abnormal heavy vehicles, caused by collisions, blast loadings and so on, -detection and identification of defects by means of analysis of changes of the bridge dynamic parameters, [1,11,14,19] -updating of numerical model of the structure on the basis of experimental data, [9,13,[17][18]25] -identification of fatigue process based on analysis of stress spectrum in structural elements of the bridge. [9,20] Generally, the results of bridge dynamic tests create background for assessment of bridge structural condition and for the prediction of the remaining service life of the structure.…”

Section: Figure 2 Classification Of Dynamic Tests Of Bridge Structuresmentioning

confidence: 99%

Dynamic Tests in Bridge Health Monitoring

Bień

Kużawa

2020

Studia Geotechnica Et Mechanica

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AbstractDynamic tests are one of the most significant diagnostic procedures applied in Bridge Health Monitoring in many countries. The paper presents a proposal of unified classification of the bridge dynamic tests together with review of the testing methods, including tests under designed and controlled loads, arranged short-term tests under normal traffic loads as well as permanent dynamic monitoring by means of built-in gauges mounted on a structure. Classification of bridge dynamic tests is proposed taking into account various types of vibration excitation methods, measured parameters and possible applications of obtained results in the Bridge Health Monitoring. General rules and procedures of bridge dynamic tests are described and discussed.

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Section: Figure 2 Classification Of Dynamic Tests Of Bridge Structuresmentioning

confidence: 99%

Dynamic Tests in Bridge Health Monitoring

Bień

Kużawa

2020

Studia Geotechnica Et Mechanica

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“…Nevertheless, a minimal change is required in the magnitude of the mass [10,11] in order to ensure minimum frequency deviation and avoid uncertainties in the identification of modal analysis [12,13]. Moreover, the change of mass should not be too high in order to minimize the difference between the modified and unmodified modes of vibration.…”

Section: Introductionmentioning

confidence: 99%

Error analysis in obtaining scale factors with operational modal analysis and mass change

García¹

2015

Rev. Fac. Ing. Antioquia

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In operational modal analysis, the accuracy obtained in the identification of modal parameters, on the one hand, and the expertise in the modification of mass used to alter the dynamic behavior of the structure, on the other, decisively affect the accuracy achieved in the estimation of the scaling factors. Through experimental tests and numerical calculations, both the experimental validation of the estimate of the error in the scaling factor due to errors in the mode of vibration and the analysis of the influence of the modal mass in the variation of the scale factor, have been carried out. From all the above, it is concluded that it is necessary to pay special attention to how to make and modify inertial increments, i.e. changes in mass.----------Keywords: operational modal analysis, scaling factors, sensitivity, mass-change method ResumenEn el análisis modal operacional, por una parte, la exactitud obtenida en la identificación de los parámetros modales y, por otra, la pericia en la modificación de masa utilizada para alterar el comportamiento dinámico de la estructura, afectan de forma decisiva la exactitud alcanzada en la estimación de los factores de escala. Mediante ensayos experimentales y cálculo numérico, se ha realizado la validación experimental de la estimación del error en el factor de escala debido a errores en el modo de vibración, así como el análisis de la influencia de la masa modal en la variación del factor de escala. De 203Error analysis in obtaining scale factors with operational modal analysis and mass change todo ello se concluye que es necesario prestar especial atención a la forma de realizar y modificar los incrementos inerciales, es decir, la modificación de masa.----------Palabras clave: análisis modal operacional, factores de escala, sensibilidad, método del cambio de masa

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“…With linear structures, approximation techniques typically utilize a first-order Taylor series approximation or structural dynamics modification theory [1]. In this paper, we propose to utilize principal component analysis of the response data, coupled with a neural network for interpolating across the parameter space.…”

Section: Introductionmentioning

confidence: 99%

Approximation and Calibration of Nonlinear Structural Dynamics

2005

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In this paper, a methodology for the calibration of nonlinear structural dynamic models is presented. Calibration of nonlinear structural dynamics offers several additional challenges beyond that of linear dynamics. Even with advanced computational power, exact nonlinear finite element simulations often take several hours to complete on engineering workstations. Thus, the proposed model calibration method utilizes an approximate structural model. This approximate analysis is embedded in the outer loop, which utilizes an exact finite element analysis to verify the validity of the approximate model. If the approximate model is shown to be invalid at that point in parameter space, then the new exact analysis is used to develop an improved approximate model and the inner loop is executed again. Specifically, this paper will focus on the two key aspects of the inner loop, namely the development of an approximate model, and the parameter identification using the approximate model.

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A Comparative Study of Structural Dynamic Modification and Sensitivity Method Approximation

Cited by 13 publications

References 13 publications

Dynamic Tests in Bridge Health Monitoring

Dynamic Tests in Bridge Health Monitoring

Error analysis in obtaining scale factors with operational modal analysis and mass change

Approximation and Calibration of Nonlinear Structural Dynamics

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