Abstract
Operational Modal Analysis is a method widely used in the wind industry to characterize structures and perform structural health monitoring or numerical model calibration. To reach this goal, optical techniques are becoming appealing because of their non-intrusiveness and their full-field feature in contrast to sensor-based methods. An innovative method is proposed herein for modal measurement with a single camera via Digital Image Correlation. The first resonance frequency of the tower is well captured from images of a shut down turbine.
Highlights
Operative Modal Analysis (OMA) aims at identifying the modal properties of a structure based on vibration data collected when it is in service, without any knowledge about the excitation
Digital Image Correlation (DIC) is a displacement field measurement technique that allows the image of a surface in its reference state to be registered with that of the deformed configuration
Integrated DIC [9] allows for the addition of kinematic hypotheses to help solving the inverse problem by adapting to the conditions of the experiment
Summary
Operative Modal Analysis (OMA) aims at identifying the modal properties of a structure based on vibration data collected when it is in service, without any knowledge about the excitation. Intrusive methods consist in placing sensors on the structure, such as accelerometers [2, 3], strain gauges [4] or optical fibres [5]. These methods present as main drawback their intrusiveness (i.e., they are demanding for installation and maintenance, which imply additional costs) and their restricted scope (i.e., point measurements)
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