Desenvolvimento de uma metodologia para medição de vibração por captura de imagem

Abstract

In the last decades, there has been a significant increase of researches in the area of non-contact measurement techniques. The photogrammetry, which is one of these techniques, has received special attention due to its practicality, as it requires basically one domestic digital camera and one computer, and due to its capability to achieve full-field measurement. This technique comes as a good option to replace other techniques that don’t attend these requirements. This work reports the development of a methodology for vibration measurement by image capture, using as base digital photogrammetry. For this two systems were monitored. The first one consists on the signal capture of a simple pendulum, comparing the achieved results of natural frequency with a theoric model. The second one consists on a one degree of freedom mechanical system, which the achieved results were compared with the theoric response fed from a conventional sensor of measurement, in this case an accelerometer was used. The computation of the displacements was made by algorithm Digital Image Correlation (DIC). For both cases a good agreement was detected in the displacements of the systems, as well as the estimation of each natural frequency, which were registered differences until 5,3%.