Modal parameters identification of a two-dimensional space structure via visual based technique

In this paper an operational technique for the vibrating condition identification, based on the use of visual systems coupled with OMA (Operational Modal Analysis) is proposed. With respect to other proposed approaches managing flexibility effects, as nets of accelerometers or even GNSS receivers, visual techniques are by far simpler to implement and pose less constraints to the structure design. In fact, the visual features of the space structure can be considered as virtual sensors for the determination of the elastic behavior. The experimental campaign performed on a very flexible plate confirms the possibility to use optical devices for the identification of modal eigenfrequencies in the range of typical large space structures.