Sensitivity-Based Operational Mode Shape Normalisation

Parloo, Eli; Verboven, Peter; Guillaume, Patrick; Overmeire, Marc Van

doi:10.1006/mssp.2002.1498

Cited by 147 publications

(95 citation statements)

References 20 publications

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“…In most cases, a modified parameter of the object is a matrix of the masses. The change is mostly at one [18,19] or more [20] measurement points. The techniques used to determine the scaling coefficients are based on different assumptions.…”

Section: Frfs Synthesis Using Scaled Operational Modal Modelmentioning

confidence: 99%

“…Both experiments are performed on the same network points and assume similar operating conditions to force the object. In the simplest case [18][19][20][21][22], it is assumed that a slight modification of the mass at a point disturbs only the natural frequencies and does not change the mode shape. The formulation according to scaling in this case can be performed independently for each identified mode shape.…”

Section: Frfs Synthesis Using Scaled Operational Modal Modelmentioning

confidence: 99%

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Operational modal filter and its applications

Mendrok

Kurowski

2012

Arch Appl Mech

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In the paper, the procedure for the estimation of modal filter coefficients from output-only data is presented. The basic concept of the procedure consists in frequency response functions synthesis based on the knowledge of an operational modal model. A method of operational mode shapes scaling is described. The method is then compared with the classical modal filter and with modal filtration of responses spectra, which is sometimes used as a solution for modal filtration based on the output-only data. Each solution is applied to load identification and damage detection. The study shows the method verification on data obtained from laboratory experiment.

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Section: Frfs Synthesis Using Scaled Operational Modal Modelmentioning

confidence: 99%

Section: Frfs Synthesis Using Scaled Operational Modal Modelmentioning

confidence: 99%

Operational modal filter and its applications

Mendrok

Kurowski

2012

Arch Appl Mech

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“…Besides this, AVT have two additional disadvantages when compared to FVT: the frequency content of the excitation may not cover the whole frequency band of interest, especially in the case of very stiff structures with high natural frequencies, and modal masses are not estimated, or mode shapes are not scaled in absolute sense, unless additional tests with extra masses over the structure are performed [5].…”

Section: Introductionmentioning

confidence: 99%

Explaining operational modal analysis with data from an arch bridge

Magalhães

Cunha

2011

Mechanical Systems and Signal Processing

247

107

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a b s t r a c tThis tutorial paper aims to introduce the topic of operational modal analysis to nonspecialists on the subject. First of all, it is stressed the relevance of this experimental technique particularly in the assessment of important civil infrastructure. Then, after a synthesis of required theoretical background, three of the most powerful algorithms for output-only modal identification are presented. The several steps of these identification procedures are illustrated with the processing of data collected on a concrete arch bridge with a span of 280 m. As the use of operational modal analysis in the context of structural health monitoring is a subject under active research, this theme is also introduced and briefly exemplified with data continuously recorded at the same bridge.

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“…In the past last years, some procedures have been proposed to determine the scaling factors based on the mass change method [2,3,4,5]. This method consists of modifying the dynamic behaviour of the structure attaching masses to the points of the structure where the mode shapes are known.…”

Section: Introductionmentioning

confidence: 99%

Scaling-factor estimation using an optimized mass-change strategy

Aenlle

Pelayo

Brincker

et al. 2010

Mechanical Systems and Signal Processing

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The mass change method is used to estimate the scaling factors, the uncertainty is reduced when, for each mode, the frequency shift is maximized and the changes in the mode shapes are minimized, which in turn, depends on the mass change strategy chosen to modify the dynamic behavior of the structure. On the other hand, the aforementioned objectives are difficult to achieve for all modes simultaneously. Thus, a study of the number, magnitude and location of the masses must be performed previously to the modal tests. In this paper, the mass change method was applied to estimate the scaling factors of a steel cantilever beam. The effect of the mass change strategy was experimentally studied by performing several modal tests in which the magnitude, the location and the number of the attached masses were changed.

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Sensitivity-Based Operational Mode Shape Normalisation

Cited by 147 publications

References 20 publications

Operational modal filter and its applications

Operational modal filter and its applications

Explaining operational modal analysis with data from an arch bridge

Scaling-factor estimation using an optimized mass-change strategy

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