Computer-aided holographic vibration analysis for vectorial displacements of bladed disks

Abstract

Photographs of hologram reconstructions which display vibration modes of bladed disks are digitized and numerically processed to determine translations and rotations of blade segments at radial locations. Because the blades are assumed not to move in the radial direction, only two holograms, each with a different sensitivity vector, are required of each vibration mode. In addition, a photograph of fringes projected onto the bladed disk is used to determine blade surface contours and compensate for their effect on the holographic fringes.